JP3687549B2 - Shift actuator for transmission - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shift actuator for a transmission that operates in a shift direction a shift lever that operates a synchronization device of a transmission mounted on a vehicle.
[0002]
[Prior art]
As a shift actuator for a transmission that operates a shift lever for operating a transmission synchronizer in the shift direction, a fluid pressure cylinder using a fluid pressure such as air pressure or hydraulic pressure as an operating source is generally used. This shift actuator using a fluid pressure cylinder requires a pipe connected to a fluid pressure source, and an electromagnetic switching valve for switching the flow path of the working fluid. There is a problem that space is required and the weight of the entire apparatus increases.
[0003]
In recent years, an electric motor type actuator has been proposed as a shift actuator for a transmission mounted on a vehicle that does not include a compressed air source or a hydraulic pressure source. The shift actuator constituted by an electric motor does not require the use of piping or an electromagnetic switching valve connected to a fluid pressure source unlike an actuator using a fluid pressure cylinder, so that the entire apparatus can be configured to be compact and lightweight. . However, in an actuator using an electric motor, a speed reduction mechanism is required to obtain a predetermined operating force. As this reduction mechanism, a mechanism using a ball screw mechanism and a mechanism using a gear mechanism have been proposed. These actuators using the ball screw mechanism and the gear mechanism are not necessarily satisfactory in terms of the durability of the ball screw mechanism and the gear mechanism, the durability of the electric motor, and the operating speed.
[0004]
Therefore, the present applicant has proposed a shift actuator for a transmission using an electromagnetic solenoid as Japanese Patent Application No. 2001-13161 as an actuator that has excellent durability and can increase the operating speed.
[0005]
[Problems to be solved by the invention]
Thus, due to the structure of the electromagnetic solenoid, the largest thrust is generated in the movable iron core at the suction end position by the fixed iron core. For this reason, in a shift actuator of a transmission using an electromagnetic solenoid, a transmission synchronization device which is a suction end position of a movable iron core connected to a shift lever via an actuating member and a push rod, that is, a stroke end of the movable iron core The maximum operating force is applied to the shift lever connected to the movable iron core at the gear-in position. As a result, a large impact is generated at the stroke end of the movable iron core and the clutch sleeve of the synchronizer.
[0006]
The present invention has been made in view of the above-mentioned facts, and its main technical problem is to reduce the thrust at the suction end position by the fixed iron core of the movable iron core, so that the movable iron core at the stroke end, the clutch sleeve of the synchronization device, etc. It is an object of the present invention to provide a shift actuator for a transmission that can alleviate the impact.
[0007]
[Means for Solving the Problems]
According to the present invention, in order to solve the main technical problem, in the shift actuator of the transmission that operates the shift lever that operates the synchronization device of the transmission in the shift direction,
A first electromagnetic solenoid and a second electromagnetic solenoid that actuate operating members connected to the shift lever in opposite directions;
Each of the first electromagnetic solenoid and the second electromagnetic solenoid includes an electromagnetic coil, a fixed iron core disposed in the electromagnetic coil, and a movable iron core disposed so as to be able to contact with and separate from the fixed iron core. A fixed yoke having an inner peripheral surface facing the outer peripheral surface of the movable iron core, and a push rod mounted on the movable iron core and engaged with the operating member,
The movable iron core and the fixed yoke are configured such that the mutually facing areas of the movable iron core and the fixed yoke are reduced at the suction end position of the movable iron core by the fixed iron core.
A shift actuator for a transmission is provided.
[0008]
A stepped convex portion is formed on one of the surfaces of the fixed core and the movable core facing each other, and a stepped concave portion corresponding to the stepped convex portion is formed on the other side. It is desirable that the position at which the edge portion and the edge portion of the recess come closest to each other corresponds to the synchronization position of the synchronization device.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of a shift actuator for a transmission constructed according to the present invention will be described in more detail with reference to the accompanying drawings.
[0010]
FIG. 1 is a cross-sectional view showing a speed change operation apparatus having a shift actuator according to the first embodiment constructed according to the present invention, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, and FIG. It is line sectional drawing.
The speed change operation device 2 in the illustrated embodiment includes a select actuator 3 and a shift actuator 5. The select actuator 3 includes three casings 31a, 31b, and 31c formed in a cylindrical shape. A control shaft 32 is disposed in the three casings 31a, 31b, and 31c, and both ends of the control shaft 32 are rotatably supported by the casings 31a and 31c on both sides via bearings 33a and 33b. ing. A spline 321 is formed at an intermediate portion of the control shaft 32, and a cylindrical shift sleeve 35 integrally formed with the shift lever 34 is spline fitted to the spline 321 so as to be slidable in the axial direction. Yes. The shift lever 34 and the shift sleeve 35 are made of a nonmagnetic material such as stainless steel, and the shift lever 34 is disposed through an opening 311b formed in the lower portion of the central casing 31b. The distal end portion of the shift lever 34 constitutes a shift mechanism of a transmission (not shown) disposed at the first select position SP1, the second select position SP2, the third select position SP3, and the fourth select position SP4. The shift blocks 301, 302, 303, and 304 are appropriately engaged.
[0011]
A magnet movable body 36 is disposed on the outer peripheral surface of the shift sleeve 35. The magnet movable body 36 includes an annular permanent magnet 361 mounted on the outer peripheral surface of the shift sleeve 35 and having magnetic poles on both axial end faces, and a pair of movable yokes 362 disposed on the axially outer side of the permanent magnet 361. , 363. The permanent magnet 361 in the illustrated embodiment has the right end surface magnetized in the N pole in FIGS. 1 and 2, and the left end surface in FIG. 1 and FIG. 2 is magnetized in the S pole. The pair of movable yokes 362 and 363 are formed in an annular shape from a magnetic material. The movable magnet 36 configured in this way is positioned at the step 351 formed on the shift sleeve 35 at the right end of the movable yoke 362 of one (right side in FIGS. 1 and 2) in FIGS. The right end of the movable yoke 363 (left side in FIGS. 1 and 2) in FIG. 1 and FIG. 2 is positioned by the snap ring 37 attached to the shift sleeve 35, and the movement in the axial direction is restricted. A fixed yoke 39 is disposed on the outer peripheral side of the magnet movable body 36 so as to surround the magnet movable body 36. The fixed yoke 39 is formed in a cylindrical shape from a magnetic material, and is attached to the inner peripheral surface of the central casing 31b. A pair of coils 40 and 41 are disposed inside the fixed yoke 39. The pair of coils 40 and 41 are wound around a bobbin 42 formed of a nonmagnetic material such as a synthetic resin and mounted on the inner peripheral surface of the fixed yoke 39. The pair of coils 40 and 41 are connected to a power circuit (not shown). The axial length of the coil 40 is set to a length substantially corresponding to the select length from the first select position SP1 to the fourth select position SP4. End walls 43 and 44 are mounted on both sides of the fixed yoke 39, respectively. Seal members 45 and 46 that contact the outer peripheral surface of the shift sleeve 35 are mounted on the inner peripheral portions of the end walls 43 and 44, respectively.
[0012]
The select actuator 3 is configured as described above, and operates according to the principle of a linear motor constituted by the magnet movable body 36, the fixed yoke 39, and the pair of coils 40, 41 disposed on the shift sleeve 35. The operation will be described below with reference to FIG.
In the select actuator 3 according to the first embodiment, as shown in FIGS. 3A and 3B, the N pole of the permanent magnet 361, one movable yoke 362, one coil 40, and a fixed yoke 39 are provided. A magnetic circuit 368 passing through the S pole of the other coil 41, the other movable side yoke 363, and the permanent magnet 361 is formed. In such a state, when currents in opposite directions are passed through the pair of coils 40 and 41 in the direction shown in FIG. 3A, the permanent magnet 361, that is, the shift sleeve 35 is subjected to FIG. As shown by the arrow in (a), thrust is generated to the right. On the other hand, when a current is passed through the pair of coils 40 and 41 in the direction opposite to that shown in FIG. 3A as shown in FIG. As shown by the arrow in FIG. 3B, thrust is generated to the left. The magnitude of the thrust generated in the permanent magnet 361, that is, the shift sleeve 35 is determined by the amount of power supplied to the pair of coils 40 and 41.
[0013]
The select actuator 3 in the illustrated embodiment cooperates with the magnitude of the thrust acting on the permanent magnet 361, that is, the shift sleeve 35 to move the shift lever 34 to the first select position SP1, the second select position SP2, and the third select position SP3. The first select position restricting means 47 and the second select position restricting means 48 for restricting the position to the select position SP3 and the fourth select position SP4 are provided. The first select position restricting means 47 is provided between the snap rings 471 and 472 attached to the right end of the central casing 31b in FIGS. 1 and 2 at a predetermined interval, and the snap rings 471 and 472. A compression coil spring 473 disposed, a moving ring 474 disposed between the compression coil spring 473 and one snap ring 471, and the movement ring 474 being a predetermined amount to the right in FIGS. It comprises a stopper 475 that abuts when moving and restricts movement of the moving ring 474.
[0014]
The first select position restricting means 47 configured as described above has a voltage of 2.4 V, for example, applied to the pair of coils 40 and 41 from the state shown in FIGS. 1 and 2 as shown in FIG. When a current is passed through, the permanent magnet 361, that is, the shift sleeve 35 moves to the right in FIGS. 1 and 2, and the right end of the shift sleeve 35 in FIGS. In this state, the spring force of the coil spring 473 is set to be larger than the thrust acting on the permanent magnet 361, that is, the shift sleeve 35, so that the shift sleeve 35 in contact with the moving ring 474 moves. The ring 474 is stopped at a position where it abuts against one snap ring 471. At this time, the shift lever 34 integrated with the shift sleeve 35 is positioned at the second select position SP2. Next, when a current is applied to the pair of coils 40 and 41 at a voltage of 4.8 V, for example, as shown in FIG. 3A, the thrust acting on the yoke 36, that is, the shift sleeve 35, is the spring force of the coil spring 473. Therefore, the shift sleeve 35 moves to the right in FIGS. 1 and 2 against the spring force of the coil spring 473 after coming into contact with the moving ring 474, and moves the moving ring 474. Is stopped at a position where it comes into contact with the stopper 475. At this time, the shift lever 34 configured integrally with the shift sleeve 35 is positioned at the first select position SP1.
[0015]
Next, the second select position restricting means 48 will be described.
The second select position restricting means 48 is provided between the snap rings 481 and 482 mounted at a predetermined interval on the left end in FIGS. 1 and 2 of the central casing 31b, and between the snap rings 481 and 482. The coil spring 483 disposed, the moving ring 484 disposed between the coil spring 483 and one snap ring 481, and the moving ring 484 moved to the left in FIGS. 1 and 2 by a predetermined amount. And a stopper 485 that abuts and regulates the movement of the moving ring 484.
[0016]
The second select position restricting means 48 configured as described above has a voltage of 2.4 V, for example, applied to the pair of coils 40 and 41 from the state shown in FIGS. 1 and 2 as shown in FIG. When a current is passed through, the permanent magnet 361, that is, the shift sleeve 35 moves to the left in FIGS. 1 and 2, and the left end of the shift sleeve 35 in FIG. 1 and FIG. In this state, the spring force of the coil spring 483 is set to be larger than the thrust acting on the permanent magnet 361, that is, the shift sleeve 35, so that the shift sleeve 35 that is in contact with the moving ring 484 moves. The ring 484 is stopped at a position where it abuts against one snap ring 481. At this time, the shift lever 34 integrated with the shift sleeve 35 is positioned at the third select position SP3. Next, when a current is applied to the pair of coils 40 and 41 at a voltage of 4.8 V, for example, as shown in FIG. Therefore, the shift sleeve 35 moves to the left in FIGS. 1 and 2 against the spring force of the coil spring 483 after coming into contact with the moving ring 484, so that the moving ring The 484 stops at a position where it abuts against the stopper 485. At this time, the shift lever 34 configured integrally with the shift sleeve 35 is positioned at the fourth select position SP4.
As described above, since the first select position restricting means 47 and the second select position restricting means 48 are provided in the illustrated embodiment, by controlling the amount of power supplied to the pair of coils 40 and 41, The shift lever 34 can be positioned at a predetermined select position without controlling the position.
[0017]
The shift operation device in the illustrated embodiment includes a select position detection sensor 8 for detecting the position of the shift sleeve 35 formed integrally with the shift lever 34, that is, the position in the select direction. The select position detection sensor 8 is composed of a potentiometer. One end of a lever 82 is attached to a rotation shaft 81 of the select position detection sensor 8, and an engagement pin 83 attached to the other end of the lever 82 is provided on the shift sleeve 35. The engaging groove 352 is engaged. Therefore, when the shift sleeve 35 moves to the left or right in FIG. Can be detected. Based on the signal from the select position detecting sensor 8, the direction of the voltage and current applied to the coils 40 and 41 of the select actuator 3 is controlled by a control means (not shown), so that the shift lever 34 is moved to a desired select position. Can be positioned.
[0018]
Further, the speed change actuator 2 in the illustrated embodiment includes a shift stroke position detection sensor 9 for detecting the rotational position of the control shaft 32, that is, the shift stroke position, to which the shift sleeve 35 integrally formed with the shift lever 34 is mounted. It has. The shift stroke position detection sensor 9 is composed of a potentiometer, and its rotation shaft 91 is connected to the control shaft 32. Therefore, when the control shaft 32 rotates, the rotation shaft 91 rotates and the rotation position of the control shaft 32, that is, the shift stroke position can be detected.
[0019]
Next, a first embodiment of a shift actuator configured according to the present invention will be described mainly with reference to FIG.
The shift actuator 5 in the first embodiment shown in FIG. 4 operates the operating levers 50 mounted on the control shaft 32 disposed in the casings 31a, 31b, 31c of the select actuator 3 in opposite directions. One electromagnetic solenoid 6 and a second electromagnetic solenoid 7 are provided. The operating lever 50 is provided with a hole 501 that fits into the control shaft 32 at the base, and a key groove 502 formed on the inner peripheral surface of the hole 501 and a key formed on the outer peripheral surface of the control shaft 32. By fitting a key 503 into the groove 322, the key 503 is configured to rotate integrally with the control shaft 32. The operating lever 50 functions as an operating member connected to the shift lever 34 via the control shaft 32 and the shift sleeve 35, and is inserted through an opening 311a formed in the lower portion of the left casing 31a in FIGS. Arranged.
[0020]
Next, the first electromagnetic solenoid 6 will be described.
The first electromagnetic solenoid 6 includes a casing 61, an electromagnetic coil 66 disposed in the casing 61 and wound around a bobbin 65 made of a nonmagnetic material such as synthetic resin, and the electromagnetic coil 66. The fixed iron core 62, the push rod 63 made of a non-magnetic material such as stainless steel, which is disposed through the through hole 621 formed in the central portion of the fixed iron core 62, and the push rod 63 is attached and fixed. It consists of a movable iron core 64 made of a magnetic material disposed so as to be able to contact and separate from the iron core 62. In the illustrated embodiment, the casing 61 is made of a magnetic material, has an inner peripheral surface 610 that faces the outer peripheral surface 640 of the movable iron core 64, and is configured to function as a fixed yoke. . When the first electromagnetic solenoid 6 configured in this way is energized to the electromagnetic coil 66, the movable iron core 64 is attracted to the fixed iron core 62 as shown in FIG. As a result, the push rod 63 fitted with the movable iron core 64 moves to the left in FIG. 4, and its tip acts on the operating lever 50 to rotate clockwise around the control shaft 32. Thereby, the shift lever 34 integrated with the shift sleeve 35 attached to the control shaft 32 is shifted in one direction. The fixed iron core 62 and the movable iron core 64 are at the suction end position shown in FIG. 5A where the electromagnetic coil 66 is energized and the movable iron core 64 is attracted to the fixed iron core 62. The areas facing each other are reduced. In the illustrated embodiment, when the shift actuator 5 is in the neutral state shown in FIG. 4 and is activated by a second electromagnetic solenoid 7 described later shown in FIG. The surface 640 faces the entire inner peripheral surface 610 of the casing 61 that functions as a fixed yoke. In the illustrated embodiment, the outer peripheral surface 640 of the movable iron core 64 and the casing 61 functioning as a fixed yoke at the suction end position shown in FIG. 5A where the movable iron core 64 is sucked into the fixed iron core 62. The areas of the inner peripheral surfaces 610 facing each other are configured to be zero (0).
[0021]
Next, the second electromagnetic solenoid 7 will be described.
The second electromagnetic solenoid 7 is disposed so as to face the first electromagnetic solenoid 6. Similarly to the first electromagnetic solenoid 6, the second electromagnetic solenoid 7 has a casing 71, an electromagnetic coil 76 disposed in the casing 71 and wound around a bobbin 75 made of a nonmagnetic material such as synthetic resin, A fixed iron core 72 disposed in the electromagnetic coil 76; and a push rod 73 made of a non-magnetic material such as stainless steel disposed through a through hole 721 formed in the center of the fixed iron core 72; , And a movable iron core 74 made of a magnetic material, which is attached to the push rod 73 and arranged so as to be able to contact and separate from the fixed iron core 72. The casing 71 is made of a magnetic material, has an inner peripheral surface 710 that faces the outer peripheral surface 740 of the movable iron core 74, and is configured to function as a fixed yoke. When the second electromagnetic solenoid 7 configured in this manner is energized to the electromagnetic coil 76, the movable iron core 74 is attracted to the fixed iron core 72 as shown in FIG. As a result, the push rod 73 fitted with the movable iron core 74 moves to the right in FIG. 4, and its tip acts on the operating lever 50 to rotate counterclockwise about the control shaft 32. As a result, the shift lever 34 formed integrally with the shift sleeve 35 attached to the control shaft 32 is shifted in the other direction. The fixed iron core 72 and the movable iron core 74 are at the suction end position shown in FIG. 5B where the electromagnetic iron 76 is energized and the movable iron core 74 is attracted to the fixed iron core 72. The areas facing each other are reduced. In the illustrated embodiment, when the shift actuator 5 is in the neutral state shown in FIG. 4 and is activated by the first electromagnetic solenoid 6 shown in FIG. The outer peripheral surface 740 faces the entire inner peripheral surface 710 of the casing 71 that functions as a fixed yoke. In the illustrated embodiment, the outer peripheral surface 740 of the movable iron core 74 and the inside of the casing 71 functioning as a fixed yoke at the suction end position shown in FIG. 5B when the movable iron core 74 is sucked into the fixed iron core 72. It is comprised so that the area where the surrounding surface 710 mutually opposes may be zero (0).
[0022]
The shift actuator 5 in the first embodiment is configured as described above, and is a synchronizer provided in a transmission (not shown) corresponding to the operating positions of the first electromagnetic solenoid 6 and the second electromagnetic solenoid 7. The relationship with the shift stroke position and the thrust at the operating position of the first electromagnetic solenoid 6 and the second electromagnetic solenoid 7 will be described with reference to FIGS. 6, 7 and 13. FIG.
FIG. 6 shows the operating state of the first electromagnetic solenoid 6 and the second electromagnetic solenoid 7. FIG. 6 (a) shows a state in which the synchronizing device is operated to the neutral position, and FIG. 6 (b) shows the first state. 6 is a state in which the synchronization device is operated to the synchronization position by the electromagnetic solenoid 6, FIG. 6C is a state in which the first electromagnetic solenoid 6 is operated to the gear-in position of the synchronization device, and FIG. FIG. 6E shows a state where the solenoid 7 is operated to the synchronization position of the synchronization device, and FIG. 6E shows a state where the second electromagnetic solenoid 7 is operated to the gear-in position of the synchronization device.
7 shows the relationship between the spline 11 of the clutch sleeve, the teeth 12a and 12b of the synchronizer ring and the dog teeth 13a and 13b in the synchronizer. FIG. 7 (a) shows the neutral state, and FIG. ) Is a synchronized state when the first electromagnetic solenoid 6 is operated, FIG. 7C is a gear-in state when the first electromagnetic solenoid 6 is operated, and FIG. 7D is a second electromagnetic solenoid 7. FIG. 7E shows a gear-in state when the second electromagnetic solenoid 7 is operated.
[0023]
FIG. 13 is an explanatory diagram showing the relationship between the operating positions of the push rods 63 and 73 of the first electromagnetic solenoid 6 and the second electromagnetic solenoid 7 and the thrust. In FIG. 13A and FIG. 13B, the electromagnetic solenoid operating position P0 is neutral when the first electromagnetic solenoid 6 and the second electromagnetic solenoid 7 are in the state shown in FIG. Is the gear-in position in which the first electromagnetic solenoid 6 and the second electromagnetic solenoid 7 are in the state shown in FIG. 6E, and PL2 is the first electromagnetic solenoid 6 and the second electromagnetic solenoid 7 in FIG. The gear-in position in the state shown in c). FIG. 13 (a) shows that the first electromagnetic solenoid 6 and the second electromagnetic solenoid 7 energize the first electromagnetic solenoid 6 from the gear-in state (PR2) in the state shown in FIG. 6 (e). FIG. 13B is a graph showing the thrust at each operating position when operating up to the gear-in position PL2 shown in FIG. 13C. FIG. 13B shows the first electromagnetic solenoid 6 and the second electromagnetic solenoid 7 shown in FIG. 7 is a graph showing the thrust at each operating position when the second electromagnetic solenoid 7 is energized to operate to the gear-in position PR2 shown in FIG. 6E from the gear-in state (PL2) shown in FIG. In FIG. 13A and FIG. 13B, the solid line shows the thrust characteristics of the first electromagnetic solenoid 6 and the second electromagnetic solenoid 7 constituting the shift actuator 5 in the first embodiment. The broken line indicates the thrust characteristic when a conventionally used electromagnetic solenoid is applied to the shift actuator.
[0024]
First, based on FIG. 13A, the first electromagnetic solenoid 6b and the second electromagnetic solenoid 7b energize the first electromagnetic solenoid 6b from the gear-in state (PR2) in the state shown in FIG. 7E. Then, the thrust (graph shown by a solid line) at each operating position when operating up to the gear-in position PL2 shown in FIG. The thrust characteristics when a conventionally used electromagnetic solenoid is applied to a shift actuator are as the stroke end position (PR2) approaches the stroke end (PL2) from the stroke start position (PR2) as indicated by the broken line (as the movable iron core approaches the fixed iron core). ) Thrust is increasing rapidly.
The shift actuator 5 in the first embodiment energizes the electromagnetic coil 66 of the first electromagnetic solenoid 6 from the gear-in state shown in FIG. 6E (the gear-in state shown in FIG. 7E in the synchronization device). Then, the movable iron core 64 is attracted to the fixed iron core 62 and a thrust is generated in the push rod 63. However, the thrust is small because the gap between the movable iron core 64 and the fixed iron core 62 is large at the gear-in position PR2 (stroke start position). Then, as the movable iron core 64 moves toward the fixed iron core 62, the thrust increases, and the neutral position indicated by P0 in FIG. 13A, that is, the neutral state shown in FIG. 7 (neutral state shown in FIG. 7 (a)), the synchronization position shown by PL1 in FIG. 13 (a), that is, the synchronization state shown in FIG. Until the state), the thrust increases in the same manner as the conventional one indicated by the broken line. In the shift actuator 5 according to the first embodiment, the inner peripheral surface of the casing 61 in which the right end of the outer peripheral surface 640 of the movable iron core 64 functions as a fixed yoke as shown in FIG. 6B at the synchronous position (PL1). The state coincides with the right end of 610.
[0025]
When the movable iron core 64 moves toward the fixed iron core 62 from the synchronized state shown in FIG. 6B and FIG. 7B, the outer peripheral surface 640 of the movable iron core 64 and the inner peripheral surface of the casing 61 functioning as a fixed yoke. The areas of 610 facing each other are reduced. As a result, the magnetic resistance between the casing 61 functioning as a fixed yoke and the movable iron core 64 increases, and the magnetic flux density of the attracting portion (opposed surface of the fixed iron core 62 and the movable iron core 64) decreases, so the first electromagnetic solenoid 6 As shown in FIG. 13 (a), the thrust between the movable iron core 64 and the fixed iron core 62 becomes smaller after passing through the synchronization position (PL1), but does not rise rapidly but is compared with the conventional one shown by the broken line. Then, the gear-in position (stroke end) indicated by PL2 is reached at a relatively low value, that is, the gear-in state shown in FIG. 6C (the gear-in state shown in FIG. 7C in the synchronizer).
[0026]
Next, based on FIG. 13B, the first electromagnetic solenoid 6 and the second electromagnetic solenoid 7 are attached to the second electromagnetic solenoid 7 from the gear-in state (PL2) in the state shown in FIG. Next, thrusts (graphs indicated by solid lines) at each operating position when operating to the gear-in position PR2 shown in FIG. 6 (e) will be described. When the electromagnetic coil 76 of the second electromagnetic solenoid 7 is energized from the gear-in state shown in FIG. 6C (the gear-in state shown in FIG. 7C in the synchronous device), the movable iron core 74 is attracted to the fixed iron core 72. Thus, thrust is generated in the push rod 73, but the thrust is small at the gear-in position PL2 (stroke start position) because the distance between the movable iron core 74 and the fixed iron core 72 is large. Then, as the movable iron core 74 moves toward the fixed iron core 72, the thrust increases, and the neutral position indicated by P0 in FIG. 13B, that is, the neutral state shown in FIG. 7 (a) (neutral state shown in FIG. 7 (a)), the synchronization position indicated by PR1 in FIG. 13 (b), that is, the synchronization state shown in FIG. 6 (d) (synchronization shown in FIG. Until the state), the thrust increases in the same manner as the conventional one indicated by the broken line. In the shift actuator 5 in the first embodiment, the inner peripheral surface of the casing 71 that functions as the left end and the fixed yoke on the outer peripheral surface 740 of the movable iron core 74 at the synchronous position (PR1) as shown in FIG. The state coincides with the left end of 710.
[0027]
When the movable core 74 moves toward the fixed core 72 from the synchronized state shown in FIGS. 6D and 7D, the outer peripheral surface 740 of the movable core 74 and the inner peripheral surface of the casing 71 functioning as a fixed yoke. The areas of 710 facing each other are reduced. As a result, the magnetic resistance between the casing 71 functioning as a fixed yoke and the movable iron core 74 is increased, and the magnetic flux density of the attracting portion (opposed surface of the fixed iron core 72 and the movable iron core 74) is lowered. As shown in FIG. 13 (b), the thrust between the movable iron core 74 and the fixed iron core 72 becomes smaller after passing through the synchronous position (PR1), but does not rise rapidly but is compared with the conventional one shown by the broken line. Thus, the gear-in position (stroke end) indicated by PR2 is reached at a relatively low value, that is, the gear-in state shown in FIG. 6E (the gear-in state shown in FIG. 7E in the synchronizer).
[0028]
As described above, the shift actuator 5 in the first embodiment includes the first electromagnetic solenoid 6 and the second electromagnetic solenoid 7 that operate the operation lever 50 (operation member) connected to the shift lever 34 in opposite directions. Since there is no rotation mechanism, durability is improved and a speed reduction mechanism consisting of a ball screw mechanism and a gear mechanism is not required as in the case of an actuator using an electric motor. The speed can be increased. Further, the shift actuator 5 in the first embodiment is used as an outer peripheral surface 640 or 740 of the movable iron core 64 or 74 and a fixed yoke at the suction end position as shown in FIGS. 5 (a) and 5 (b). Since the opposing surface area of the inner peripheral surface 610 or 710 of the functioning casing 61 or 71 decreases, the magnetic resistance between the casing 61 or 71 functioning as a fixed yoke and the movable iron core 64 or 74 increases. And since the magnetic flux density of an attraction | suction part falls, the thrust at the stroke end of the 1st electromagnetic solenoid 6 or the 2nd electromagnetic solenoid 6 can be reduced. Therefore, the impact of the movable iron cores 64 and 74 and the clutch sleeve of the synchronizer at the stroke end can be reduced.
[0029]
Next, a second embodiment of the shift actuator constructed according to the present invention will be described with reference to FIGS. 8 and 9, the same members as those in the first embodiment shown in FIGS. 4 and 5 are given the same reference numerals, and detailed description thereof is omitted.
While the shift actuator 5 in the first embodiment shown in FIGS. 4 and 5 is a push-type actuator, the shift actuator 5a in the second embodiment shown in FIGS. 8 and 9 is a pull-type actuator. Is. That is, the shift actuator 5a in the second embodiment includes the first electromagnetic solenoid 6a and the second electromagnetic solenoid 7a that operate the operation lever 50 mounted on the control shaft 32 in opposite directions. The first electromagnetic solenoid 6a is disposed in the casing 61a, an electromagnetic coil 66a wound around a bobbin 65a made of a non-magnetic material such as a synthetic resin and disposed in the casing 61a, and the electromagnetic coil 66a. The fixed iron core 62a, the movable iron core 64a made of a magnetic material arranged so as to be able to contact with and separate from the fixed iron core 62a, and an appropriate composition for guiding the movement of the movable iron core 64a arranged inside the bobbin 65a. And a cylindrical slide guide 67a made of resin or the like. In the illustrated embodiment, the casing 61a is made of a magnetic material, has an inner peripheral surface 610a facing the outer peripheral surface 640a of the movable iron core 64a, and is configured to function as a fixed yoke. .
[0030]
The second electromagnetic solenoid 7a is disposed so as to face the first electromagnetic solenoid 6a. Similarly to the first electromagnetic solenoid 6a, the second electromagnetic solenoid 7a has a casing 71a, and an electromagnetic coil 76a wound around a bobbin 75a made of a nonmagnetic material such as a synthetic resin and disposed in the casing 71a. A fixed iron core 72a arranged in the electromagnetic coil 76a, a movable iron core 74a made of a magnetic material arranged so as to be able to contact with and separate from the fixed iron core 72a, and a movable iron core arranged inside the bobbin 75a. And a cylindrical slide guide 77a made of an appropriate synthetic resin or the like for guiding the movement of 74a. The casing 71a is also made of a magnetic material like the casing 61a, and has an inner peripheral surface 710a facing the outer peripheral surface 740a of the movable iron core 74a, and is configured to function as a fixed yoke. In the shift actuator 5a in the second embodiment, the movable iron core 64a of the first electromagnetic solenoid 6a and the movable iron core 74a of the second electromagnetic solenoid 7a are connected by a single push rod 78a. A notch groove 781a is formed at the center of the push rod 78a, and the tip of the operating lever 50 is engaged with the notch groove 781a.
[0031]
The shift actuator 5a in the second embodiment is configured as described above, and the operation thereof will be described below.
When the electromagnetic coil 76a of the second electromagnetic solenoid 7a is energized, the movable iron core 74a is attracted to the fixed iron core 72a as shown in FIG. As a result, the push rod 78a coupled to the movable iron core 74a moves to the left in FIG. 8, and the operation lever 50 whose tip is fitted in a notch groove 781a formed in the center of the push rod 78a is interposed. As a result, the control shaft 32 is rotated clockwise. Thereby, the shift lever 34 integrated with the shift sleeve 35 attached to the control shaft 32 is shifted in one direction. Note that the fixed iron core 72a and the movable iron core 74a are located at the suction end position shown in FIG. 9A in which the electromagnetic coil 76a is energized and the movable iron core 74a is attracted to the fixed iron core 72a. The areas facing each other are reduced. In the illustrated embodiment, when the shift actuator 5a is in the neutral state shown in FIG. 8 and when it is actuated by a first electromagnetic solenoid 6a described later shown in FIG. The outer peripheral surface 740a is opposed to the entire inner peripheral surface 710a of the casing 71a functioning as a fixed yoke. In the illustrated embodiment, the outer peripheral surface 740a of the movable iron core 74a and the casing 71a functioning as a fixed yoke at the suction end position shown in FIG. 9A where the movable iron core 74a is sucked into the fixed iron core 72a. The areas of the inner peripheral surface 710a facing each other are configured to be zero (0).
[0032]
Further, when the electromagnetic coil 66a of the first electromagnetic solenoid 6a is energized, the movable iron core 64a is attracted to the fixed iron core 62a. As a result, the push rod 78a connected to the movable iron core 64a moves to the right in FIG. 9, and the operating lever 50 is fitted with a notch groove 781a formed at the center of the push rod 78a. Thus, the control shaft 32 is rotated counterclockwise. As a result, the shift lever 34 formed integrally with the shift sleeve 35 attached to the control shaft 32 is shifted in the other direction. The fixed iron core 62a and the movable iron core 64a are at the suction end position shown in FIG. 9B where the electromagnetic coil 66a is energized and the movable iron core 64a is sucked into the fixed iron core 62a. The areas facing each other are reduced. In the illustrated embodiment, when the shift actuator 5a is in the neutral state shown in FIG. 8 and is activated by the second electromagnetic solenoid 7a shown in FIG. 9A, the outer periphery of the movable iron core 64a is shown. The surface 640a faces the entire inner peripheral surface 610a of the casing 61a functioning as a fixed yoke. In the illustrated embodiment, the outer peripheral surface 640a of the movable iron core 64a and the casing 61a functioning as a fixed yoke at the suction end position shown in FIG. 9B where the movable iron core 64a is sucked into the fixed iron core 62a. The areas of the inner peripheral surface 610a facing each other are configured to be zero (0).
[0033]
As described above, the shift actuator 5a in the second embodiment is similar to the shift actuator 5 in the first embodiment, as shown in FIGS. 9 (a) and 9 (b). Thus, since the area of the outer peripheral surface 740a or 640a of the movable iron core 74a or 64a and the inner peripheral surface 710a or 610a of the casing 71a or 61a that functions as a fixed yoke decreases, it functions as a fixed yoke. Reduces the thrust at the stroke end of the second electromagnetic solenoid 7a or the first electromagnetic solenoid 6a because the magnetic resistance between the casing 71a or 61a and the movable iron core 74a or 64a increases and the magnetic flux density of the attracting portion decreases. can do. Therefore, it is possible to mitigate the impact of the movable iron cores 74a and 64a at the stroke end and the clutch sleeve of the synchronizer.
[0034]
Next, a third embodiment of the shift actuator constructed according to the present invention will be described with reference to FIG. In FIG. 10, the same members as those in the first embodiment shown in FIGS. 4 and 5 are denoted by the same reference numerals, and detailed description thereof is omitted.
Similarly to the first embodiment, the shift actuator 5b in the third embodiment shown in FIG. 10 is also an operating lever mounted on the control shaft 32 provided in the casings 31a, 31b, 31c of the select actuator 3. The first electromagnetic solenoid 6b and the second electromagnetic solenoid 7b that actuate the actuator 50 are provided. The difference between the first electromagnetic solenoid 6b and the second electromagnetic solenoid 7b in the third embodiment and the first electromagnetic solenoid 6 and the second electromagnetic solenoid 7 in the first embodiment is that a fixed iron core and a movable iron core are respectively movable. It is a point from which the shape of the mutually opposite end surface of an iron core differs. That is, the feature of the first electromagnetic solenoid 6b and the second electromagnetic solenoid 7b in the third embodiment is that the stepped convex portion 621b is located at the center of the end surfaces of the fixed iron cores 62b and 72b facing the movable iron cores 64b and 74b, respectively. And 721b are formed, and stepped concave portions 641b and 741b corresponding to the convex portions 621b and 721b are formed at the center of the end surfaces of the movable cores 64b and 74b facing the fixed cores 62b and 72b. And the position where the edge parts 622b and 722b of the convex parts 621b and 721b of the fixed iron cores 62b and 72b and the edge parts 642b and 742b of the concave parts 641b and 741b of the movable iron cores 64b and 74b are closest to each other is described later. It is configured to correspond to the synchronization position. In the embodiment shown in FIG. 10, an example is shown in which stepped convex portions 621b and 721b are formed on the fixed iron cores 62b and 72b, and stepped concave portions 641b and 741b are formed on the movable iron cores 64b and 74b. Alternatively, stepped convex portions may be formed on the movable iron cores 64b and 74b, and stepped concave portions may be formed on the fixed iron cores 62b and 72b.
[0035]
The shift actuator 5b in the third embodiment is configured as described above, and is a synchronizer provided in a transmission (not shown) corresponding to the operating positions of the first electromagnetic solenoid 6b and the second electromagnetic solenoid 7b. The relationship with the shift stroke position and the thrust at the operating position of the first electromagnetic solenoid 6b and the second electromagnetic solenoid 7b will be described with reference to FIG. 11 and FIGS. 7 and 13 described above.
FIG. 11 shows the operating state of the first electromagnetic solenoid 6b and the second electromagnetic solenoid 7b. FIG. 11 (a) shows a state in which the synchronizing device is operated to the neutral position, and FIG. 11 (b) shows the first operating state. FIG. 11C shows a state where the synchronizing device is operated to the gear-in position of the synchronizing device, and FIG. 11D shows a second electromagnetic state. FIG. 11E shows a state where the solenoid 7b is operated to the synchronization position of the synchronization device, and FIG. 11E shows a state where the second electromagnetic solenoid 7b is operated to the gear-in position of the synchronization device.
[0036]
First, based on FIG. 13 (a), the first electromagnetic solenoid 6b and the second electromagnetic solenoid 7b energize the first electromagnetic solenoid 6b from the gear-in state (PR2) in the state shown in FIG. 11 (e). Then, the thrust (a graph indicated by a one-dot chain line) at each operating position when operating up to the gear-in position PL2 shown in FIG. When the electromagnetic coil 66 of the first electromagnetic solenoid 6b is energized from the gear-in state shown in FIG. 11E (the gear-in state shown in FIG. 7E in the synchronous device), the movable iron core 64b is attracted to the fixed iron core 62b. Thus, thrust is generated in the push rod 63, but the thrust is small at the gear-in position PR2 (stroke start position) because the distance between the movable iron core 64b and the fixed iron core 62b is large. Then, as the movable iron core 64b moves toward the fixed iron core 62b, the thrust increases, and the neutral position indicated by P0 in FIG. 13A, that is, the neutral state shown in FIG. 7 (neutral state shown in (a) of FIG. 7), the edge 642b of the concave portion 641b of the movable iron core 64b approaches the edge 622b of the convex portion 621b of the fixed iron core 62b, and PL1 in FIG. The two edge portions are closest to each other at the synchronization position indicated by (i), that is, in the synchronization state shown in FIG. 11 (b) (in the synchronization device, the synchronization state shown in FIG. 7 (b)). In the synchronized state shown in FIG. 11 (b), the magnetic flux density at both the edge portions increases, so that the thrust increases. At this time, as shown in FIG. 11B, the right end of the outer peripheral surface 640b of the movable iron core 64b coincides with the right end of the inner peripheral surface 610 of the casing 61 functioning as a fixed yoke, or is positioned slightly to the right of the right end. Become.
[0037]
In FIG. 13A, when the synchronization position indicated by PL1 is passed, the concave portion 621b of the movable iron core 64b and the convex portion 641b of the fixed iron core 62b are fitted, so that the magnetic flux in the fitting portion is in the radial direction. The thrust decreases because of the action. When the movable iron core 64b further approaches the fixed iron core 62b, the thrust increases, and the gear-in position (stroke end) indicated by PL2 in FIG. 13 (a), that is, the gear-in state shown in FIG. The gear-in state shown in FIG. In addition, between the synchronous position shown by PL1 and the gear-in position (stroke end) shown by PL2, the mutually opposing areas of the outer peripheral surface 640b of the movable iron core 64b and the inner peripheral surface 610 of the casing 61 functioning as a fixed yoke gradually decrease. Since the magnetic resistance between the casing 61 functioning as a fixed yoke and the movable iron core 64b is increased and the magnetic flux density of the attracting portion is reduced, the thrust at the stroke end of the first electromagnetic solenoid 6b is reduced. Can be reduced. Therefore, the impact of the movable iron core 64b at the stroke end and the clutch sleeve of the synchronizer can be reduced.
[0038]
Next, based on FIG. 13B, the first electromagnetic solenoid 6b and the second electromagnetic solenoid 7b are attached to the second electromagnetic solenoid 7b from the gear-in state (PL2) in the state shown in FIG. 11C. Next, the thrust (a graph indicated by a one-dot chain line) at each operating position when operating to the gear-in position PR2 shown in FIG. When the electromagnetic coil 76 of the second electromagnetic solenoid 7b is energized from the gear-in state shown in FIG. 11C (in the synchronous device, the gear-in state shown in FIG. 7C), the movable iron core 74b is attracted to the fixed iron core 72b. Thus, thrust is generated in the push rod 73, but the thrust is small at the gear-in position PL2 (stroke start position) because the distance between the movable iron core 74b and the fixed iron core 72b is large. Then, the thrust increases as the movable iron core 74b moves toward the fixed iron core 72b, and the neutral position indicated by P0 in FIG. 13B, that is, the neutral state shown in FIG. 7 (a) (neutral state shown in FIG. 7 (a)), the edge 742b of the recess 741b of the movable core 74b and the edge 722b of the projection 721b of the fixed core 72b approach each other, and PR1 in FIG. 13 (b). That is, the two edge portions are closest to each other at the synchronization position shown in FIG. 11, that is, in the synchronization state shown in FIG. 11D (in the synchronization device, the synchronization state shown in FIG. 7D). In the synchronized state shown in FIG. 11 (d), the magnetic flux density at both the edge portions is increased, so that the thrust is increased. At this time, as shown in FIG. 11 (d), the left end of the outer peripheral surface 740b of the movable iron core 74b coincides with the left end of the inner peripheral surface 710 of the casing 71 functioning as a fixed yoke, or is positioned slightly to the right of the right end. Become.
[0039]
When the synchronization position indicated by PR1 in FIG. 13 (b) is passed, the concave portion 721b of the movable iron core 74b and the convex portion 741b of the fixed iron core 72b are fitted, so that the magnetic flux is radial in the fitting portion. The thrust decreases because of the action. When the movable iron core 74b further approaches the fixed iron core 72b, the thrust increases, and the gear-in position (stroke end) indicated by PR2 in FIG. 13B, that is, the gear-in state shown in FIG. The gear-in state shown in FIG. In addition, between the synchronous position indicated by PR1 and the gear-in position (stroke end) indicated by PR2, the mutually opposing areas of the outer peripheral surface 740b of the movable iron core 74b and the inner peripheral surface 710 of the casing 71 functioning as a fixed yoke gradually decrease. Since the magnetic resistance between the casing 71 functioning as a fixed yoke and the movable iron core 74b is increased and the magnetic flux density of the attracting portion is decreased, the thrust at the stroke end of the second electromagnetic solenoid 7b is reduced. Can be reduced. Therefore, the impact of the movable iron core 74b and the clutch sleeve of the synchronizer at the stroke end can be reduced.
[0040]
As described above, the shift actuator 5b according to the third embodiment, which includes the first electromagnetic solenoid 6b and the second electromagnetic solenoid 7b, has a characteristic that the thrust rises once at the synchronization position (PL1, PR1) of the synchronization device. Therefore, since a predetermined thrust can be obtained at a synchronization position where an operation force is required, the electromagnetic solenoid can be reduced in size. Moreover, since the shift actuator 5b in the third embodiment reduces the increase in thrust at the stroke end, it can alleviate the impact of the movable iron core and the clutch sleeve of the synchronizer at the stroke end. In the third embodiment shown in FIGS. 10 and 11, an example in which the present invention is applied to a push-type actuator corresponding to the first embodiment is shown. However, a pull-type actuator in the second embodiment is shown. The same effect can be obtained even if is applied to the present invention.
[0041]
Next, a fourth embodiment of the shift actuator constructed according to the present invention will be described with reference to FIG. In FIG. 12, the same members as those in the third embodiment shown in FIGS. 10 and 11 are denoted by the same reference numerals, and detailed description thereof is omitted.
The shift actuator 5c in the fourth embodiment includes stepped protrusions 621c and 721c formed at the center of the end surfaces of the fixed iron cores 62c and 72c constituting the first electromagnetic solenoid 6c and the second electromagnetic solenoid 7c, The shape of the stepped recesses 641c and 741c of the movable iron cores 64c and 74c corresponding to the projections 621c and 721c formed at the center of the end surfaces of the fixed iron cores 62c and 72c is the third shape shown in FIGS. It differs from the shape of the step-shaped convex parts 621b and 721b and the step-shaped recessed parts 641b and 741b in the shift actuator 5b in the embodiment. That is, the outer peripheral surfaces of the convex portions 621b and 721b and the inner peripheral surfaces of the concave portions 641b and 741b in the third embodiment have the same diameter over the entire length, but the shift actuator 5c in the fourth embodiment shown in FIG. The outer peripheral surfaces of the convex portions 621c and 721c and the inner peripheral surfaces of the concave portions 641c and 741c are tapered. The fixed iron cores 62c and 72c and the movable iron cores 64c and 74c constituting the first electromagnetic solenoid 6c and the second electromagnetic solenoid 7c are fixed to the outer peripheral surface 640c or 740c of the movable iron core 64c or 74c, respectively, at the suction end position. It is comprised so that the area where the internal peripheral surface 610 or 710 of the casing 61 or 71 which functions as a yoke mutually opposes reduces. The thrust characteristic of the shift actuator 5c configured as described above is that of the shift actuator 5b in the third embodiment shown by a one-dot chain line as shown by a two-dot chain line in FIGS. 13 (a) and 13 (b). This is an intermediate characteristic between the thrust characteristic and the thrust characteristic of the shift actuator 5 in the first embodiment indicated by the solid line. And if the taper angle of the outer peripheral surface of the said convex part 621c, 721c and the inner peripheral surface of the recessed part 641c, 741c is small, it will become a thrust characteristic which approaches a solid line, and if the taper angle becomes large, it will become a thrust characteristic which approaches a broken line.
[0042]
As described above, the present invention is applied to the shift actuator that constitutes the shift operation device together with the select actuator. However, the shift actuator according to the present invention is applied to, for example, a shift assist device that assists the operation force in the shift direction in the manual transmission mechanism. can do.
[0043]
【The invention's effect】
Since the shift actuator of the transmission according to the present invention is configured as described above, the following effects can be obtained.
[0044]
That is, in the shift actuator of the transmission according to the present invention, the movable iron core and the fixed yoke constituting the first electromagnetic solenoid and the second electromagnetic solenoid are fixed to the movable iron core at the suction end position of the movable iron core by the fixed iron core. Since the areas of the yokes facing each other are reduced, the magnetic resistance between the fixed yoke and the movable iron core is increased, and the magnetic flux density of the attracting portion is reduced. Therefore, the first electromagnetic solenoid or the second electromagnetic solenoid The thrust at the stroke end of the solenoid can be reduced. Therefore, it is possible to mitigate the impact of the movable iron core at the stroke end and the clutch sleeve of the synchronizer.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a speed change operation device including a shift actuator according to a first embodiment configured according to the present invention.
FIG. 2 is a cross-sectional view taken along line AA in FIG.
FIG. 3 is an operation explanatory view of a select actuator constituting the speed change operating device shown in FIG. 1;
4 is a sectional view taken along line BB in FIG. 1. FIG.
FIG. 5 is an explanatory diagram showing an operating state of the shift actuator in the first embodiment shown in FIG. 4;
6 is an explanatory view showing each operation state of the shift actuator in the first embodiment shown in FIG. 4; FIG.
FIG. 7 is an explanatory diagram showing a shift stroke position of the synchronization device corresponding to each operation state of the shift actuator.
FIG. 8 is a sectional view showing a second embodiment of a shift actuator configured according to the present invention.
FIG. 9 is an explanatory view showing an operating state of the shift actuator in the second embodiment shown in FIG. 8;
FIG. 10 is a cross-sectional view showing a third embodiment of a shift actuator configured according to the present invention.
FIG. 11 is an explanatory diagram showing each operation state of the shift actuator in the third embodiment shown in FIG.
FIG. 12 is a cross-sectional view showing a fourth embodiment of a speed change actuator constructed according to the present invention.
FIG. 13 is a diagram showing a relationship between each operation position of a shift actuator and thrust.
[Explanation of symbols]
2: Shifting operation device
3: Select actuator
31a, 31b, 31c: casing
32: Control shaft
33a, 33b: Bearing
34: Shift lever
35: Shift sleeve
36: Magnet movable body
361: Permanent magnet
362, 363: movable yoke
39: Fixed yoke
40, 41: Coil
42: Bobbin
47: First select position restricting means
48: Second select position restricting means
5: Shift actuator (first embodiment)
5a: Shift actuator (second embodiment)
5b: Shift actuator (third embodiment)
5c: Shift actuator (fourth embodiment)
50: Actuating lever
6, 6a, 6b, 6c: First electromagnetic solenoid
61, 61a: casing
62, 62a, 62b, 62c: Fixed iron core
63: Push rod
64, 64a, 64b, 64c: movable iron core
66, 66a: Electromagnetic coil
7, 7a, 7b, 7c: second electromagnetic solenoid
61, 71a: casing
72, 72a, 72b, 72c: Fixed iron core
73: Push rod
74, 74a, 74b, 74c: movable iron core
76, 76a: Electromagnetic coil
78: Push rod
8: Select position detection sensor
9: Shift stroke position detection sensor
11: Synchronous clutch sleeve sling
12a, 12b: Synchronizer ring of the synchronizer
13a, 13b: Dog teeth 1 of the synchronization device

Claims (2)

In a shift actuator of a transmission that operates a shift lever that operates a synchronization device of the transmission in a shift direction,
A first electromagnetic solenoid and a second electromagnetic solenoid that actuate operating members connected to the shift lever in opposite directions;
Each of the first electromagnetic solenoid and the second electromagnetic solenoid includes an electromagnetic coil, a fixed iron core disposed in the electromagnetic coil, and a movable iron core disposed so as to be able to contact with and separate from the fixed iron core. A fixed yoke having an inner peripheral surface facing the outer peripheral surface of the movable iron core, and a push rod mounted on the movable iron core and engaged with the operating member,
The movable iron core and the fixed yoke are configured such that the mutually facing areas of the movable iron core and the fixed yoke are reduced at the suction end position of the movable iron core by the fixed iron core.
A shift actuator for a transmission. A stepped convex portion is formed on one of the surfaces of the fixed core and the movable core facing each other, and a stepped concave portion corresponding to the stepped convex portion is formed on the other, and the convex portion The shift actuator for a transmission according to claim 1, wherein a position at which the edge portion of the recess and the edge portion of the recess are closest to each other corresponds to a synchronization position of the synchronization device.

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