JP4576225B2 - Valve device for preventing clutch shock torque - Google Patents

Description

  The present invention relates to a valve device for preventing shock torque of a clutch.

  When shifting a vehicle equipped with a manually operated transmission, first depress the clutch pedal to temporarily disconnect the engine and transmission, then operate the shift lever to switch the gear ratio of the transmission gear, Next, a series of operations of releasing the depression of the clutch pedal and returning the connection between the engine and the transmission is performed.

  In addition, the above-described speed change is performed by a mechanism described below. When the clutch pedal is depressed, the hydraulic fluid is discharged from the master cylinder, flows into the slave cylinder, and the engine and transmission are disconnected. When the depression of the clutch pedal is released, the working fluid returns from the slave cylinder to the master cylinder, and the engine and the transmission are connected.

  Among these operations, when the difference in the rotational speed between the engine and the transmission rotation shaft is large, such as when starting, if the release of the clutch pedal is quickly performed, the connection between the engine and the transmission is instantaneously established. The shock torque is generated. This clutch shock torque causes engine stoppage, abnormal wear of the clutch, and the like.

  Therefore, conventionally, in order to prevent the shock torque, as shown in FIGS. 7 and 8, a shock torque preventing valve device 120 that restricts the flow of hydraulic fluid flowing back from the slave cylinder 112 to the master cylinder 111 is provided as a slave cylinder. The present applicant has previously proposed a configuration in which the hydraulic fluid is disposed on the hydraulic fluid passage 114 between 112 and the master cylinder 111 (see Patent Document 1).

  In this configuration, the valve device 120 restricts the flow of the hydraulic fluid that recirculates from the slave cylinder 112 to the master cylinder 111. Therefore, even when the depression of the clutch pedal 110 is quickly performed, the connection between the engine and the transmission is performed. Is not performed instantaneously, and shock torque can be prevented.

  The configuration of the valve device 120 having such an operation is as follows. That is, it has a master cylinder side main body 151 provided with a port 152b connected to the master cylinder 111, an inner hole 150 and a mounting hole 170, and a port 152a connected to the slave cylinder 112. A slave cylinder side main body 159 that constitutes a valve device main body together with the cylinder side main body 151, and is attached to the inner hole 150 in a state of being sandwiched between the main bodies 151 and 159, and includes a large diameter throttle hole 153 a and a check valve 154. The fixed valve body 155, the movable valve body 157 having a small-diameter throttle hole 153b slidably accommodated in the inner hole 150 in a direction to come in contact with and away from the fixed valve body 155, and the inner hole 150 are provided. And a spring 158 that presses the movable valve body 157 toward the fixed valve body 155 by an elastic force. The two throttle holes 153a and 153b are provided on the same axis as shown in FIG. 7 shows a state in which the movable valve body 157 is in contact with the fixed valve body 155, and FIG. 8 shows a state in which the movable valve body 157 is separated from the fixed valve body 155.

  The check valve 154 has an annular shape made of an elastic material such as rubber, and the inner peripheral side is held by the fixed valve body 155 so as to close the valve hole 155a provided separately from the large-diameter throttle hole 153a. Yes. When the hydraulic fluid flows from the master cylinder 111 to the slave cylinder 112, the hydraulic fluid is bent and deformed to the port 152a side by the pressure of the hydraulic fluid to open the valve hole 155a. On the other hand, the hydraulic fluid returns from the slave cylinder 112 to the master cylinder 111. When doing so, the check valve 154 returns to its original shape and closes the valve hole 155a.

Accordingly, the circulating hydraulic fluid passes through the large-diameter throttle hole 153a and presses the peripheral portion of the small-diameter throttle hole 153b. At this time, when the temperature of the hydraulic fluid is high and the pressing force of the peripheral portion of the throttle hole 153b by the hydraulic fluid is smaller than the elastic force of the spring 158, the movable valve body 157 comes into contact with the fixed valve body 155 and the large-diameter throttle The reflux hydraulic fluid that has passed through the hole 153a passes through the small-diameter throttle hole 153b with a sufficient throttle amount and is returned to the master cylinder 111, so that shock torque is prevented. When the temperature of the hydraulic fluid is low and the pressing force is larger than the elastic force of the spring 158, the movable valve body 157 is opened away from the fixed valve body 155 and passes through the large-diameter throttle hole 153a. As for the recirculating hydraulic fluid, a specified amount of the hydraulic fluid recirculates to the master cylinder 111 side via a liquid passage (not shown) other than the throttle hole 153 b provided in the movable valve body 157.
JP 2002-188659 A

  In the valve device, a fixed valve body 155 and a movable valve body 157 are individually attached to the main body 151, and the two valve bodies 155 and 157 are relatively free to be displaced relative to each other in the radial direction by a gap with the main body 151. Since it is in a ready state, there is a possibility that the axial center position of the movable valve body 157 with respect to the fixed valve body 155 is shifted by that amount. When such misalignment occurs, the small-diameter throttle hole 153b is eccentric with respect to the large-diameter throttle hole 153a, and the flow resistance of the hydraulic fluid in the throttle hole 153b is changed due to the change in the eccentric amount. become. In particular, when the amount of eccentricity is large enough that a part of the periphery of the small-diameter throttle hole 153b deviates to the outside of the peripheral edge of the large-diameter throttle hole 153a, the large-diameter portion around the small-diameter throttle hole 153b in the movable valve body The area overlapping with the throttle hole 153a, that is, the so-called pressure receiving area, increases from the normal area, and the flow rate flowing through the throttle hole 153b decreases, so that the timing for switching to the valve opening state is not appropriate.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a shock torque preventing valve device capable of suppressing the displacement of the movable valve body with respect to the fixed valve body.

The invention according to claim 1 is disposed in a passage through which hydraulic fluid is passed in both directions between a master cylinder operated by a clutch pedal and a slave cylinder that moves the clutch by hydraulic pressure of the hydraulic fluid. A shock torque preventing valve device that prevents shock torque of the clutch by restricting the flow rate of the hydraulic fluid recirculating to the master cylinder, having a slave cylinder side opening and a master cylinder side opening on the passage , A valve body having an inner hole communicating with each of the openings ; a fixed valve body having a first throttle hole fixed in the inner hole of the valve body and connected to the slave cylinder side opening; a possible, slidably disposed within said bore of said valve body, and the leads to the master cylinder side opening And having an aperture hole in the fixed valve body side, provided at a position where the peripheral portion of the second throttle hole is the first throttle hole small and the second throttle hole than to face the peripheral portion of the first throttle hole A movable valve body, and when the movable valve body approaches the fixed valve body, a peripheral portion of the second throttle hole in the movable valve body is the first throttle hole in the fixed valve body. The peripheral part of the second throttle hole is separated from the peripheral part of the first throttle hole, and the movable valve body is separated from the fixed valve body, and While the peripheral portion of the second throttle hole is in contact with the peripheral portion of the first throttle hole, the reflux hydraulic fluid flowing through the first throttle hole flows to the master cylinder side opening only through the second throttle hole, while the second periphery of the throttle hole is away from the periphery of the first throttle hole In this state, the recirculating hydraulic fluid flowing through the first throttle hole flows through the liquid passage provided separately from the gap between the two valve bodies and the second throttle hole, and flows to the master cylinder side opening. The guide portion is provided to project along the axial direction of the fixed valve body so as to guide the fixed valve body side provided with the second throttle hole of the movable valve body , and the guide portion is provided to the movable valve body. The structure is characterized in that the fixed valve body side of the body is guided to make the axial center position of the second throttle hole coincide with the axial center position of the first throttle hole .

  According to a second aspect of the present invention, in the valve device for preventing shock torque of the clutch according to the first aspect, the guide portion has a shape that restrains the movable valve body from the outside in the radial direction, and the guide portion. A part of the liquid passage is ensured in the axial region where the hydraulic fluid is allowed to flow between the radially inner side and the outer side of the guide portion.

  According to a third aspect of the present invention, in the valve device for preventing a shock torque of the clutch according to the second aspect, the guide portion includes a plurality of guide pieces spaced apart from each other in the circumferential direction, and the liquid A part of the passage is provided between the guide pieces.

  According to a fourth aspect of the present invention, in the valve device for shock torque prevention of the clutch according to the third aspect, each of the guide pieces protrudes from the fixed valve body toward the movable valve body, and the movable valve body. Has a guided portion having a diameter smaller than that of the other portion and capable of entering the inside of the guide piece in the portion on the fixed valve body side.

According to a fifth aspect of the present invention, in the valve device for shock torque prevention of the clutch according to the third or fourth aspect , an end peripheral edge of the second throttle hole on the fixed valve body side is enlarged in diameter toward the fixed valve body side. It is characterized by being formed in a tapered shape.

  A sixth aspect of the present invention is the valve device for preventing shock torque of the clutch according to the fifth aspect, wherein the peripheral edge of the first throttle hole on the side of the movable valve body is tapered so as to increase in diameter toward the movable valve body side. It is characterized by being formed.

A seventh aspect of the present invention is the valve device for preventing shock torque of the clutch according to any one of the third to sixth aspects, wherein the leading end of the guide piece on the movable valve body side becomes thinner toward the leading end. It is characterized by being formed.
The invention according to claim 8 is the valve device for preventing shock torque of the clutch according to claim 1 or 2, wherein the peripheral edge of the second throttle hole on the side of the fixed valve body is increased in diameter toward the side of the fixed valve body. It is characterized by being formed in a tapered shape.
According to a ninth aspect of the present invention, in the valve device for preventing shock torque of the clutch according to the eighth aspect, the end periphery of the first throttle hole on the side of the movable valve body is tapered so as to increase in diameter toward the movable valve body side. It is characterized by being formed.

  According to the first aspect of the present invention, since the guide portion for guiding the movable valve body is provided in the fixed valve body, the relative position of both valve bodies is determined with certainty. The positional deviation between the holes is effectively suppressed.

  According to the second aspect of the invention, the guide portion of the fixed valve body restrains the movable valve body from the outside in the radial direction, so that the positional deviation between the throttle holes is reliably suppressed. In addition, since a part of the liquid passage is secured in the axial region where the guide portion is provided, a sufficient liquid flow area can be secured regardless of the presence of the guide portion.

  According to the third aspect of the invention, the movable valve body is effectively restrained from a plurality of directions by the plurality of guide pieces provided at intervals in the circumferential direction on the fixed valve body, and the liquid passage Can be secured with a sufficient area between the guide pieces.

  According to the invention of claim 4, while providing the guided portion capable of entering the movable valve body inside the plurality of guide pieces, the other portion has a larger diameter than the guided portion, It is possible to secure the guide function of the movable valve body by the inner peripheral surface of the inner hole by making the gap between the portion and the main body inner hole as small as possible.

According to the invention described in claim 5 or 8 , the opening area of the movable valve body toward the first throttle hole side is reduced by making the end portion tapered while keeping the flow area of the second throttle hole small. It is possible to ensure a large amount, and thereby it is possible to suppress a change in the flow resistance of the hydraulic fluid in the second throttle hole. Moreover, while expanding the aperture area of the second aperture hole in this way, by placing the aperture of the second aperture hole inside the aperture of the first aperture hole by the positioning function of both aperture holes by the guide portion, It is possible to prevent changes in the pressure receiving area and changes in the amount of restriction.

In particular, in the invention according to claim 6 or 9 , by providing a tapered portion on the first throttle hole side to increase the opening area toward the second throttle hole side, The opening of the two throttle holes can be more reliably accommodated, and the change of the pressure receiving area and the change of the throttle amount can be prevented more reliably.

  According to the seventh aspect of the present invention, since the inner end of the guide piece on the side of the movable valve body is tapered, it is easy to enter the guided portion into the guide piece, and the assembly of both valve bodies is improved. To do.

  Hereinafter, embodiments of the present invention will be described.

  1 and 2 are front sectional views of the shock torque preventing valve device according to this embodiment. FIG. 1 shows a state in which the movable valve body 57 and the fixed valve body 55 are in contact with each other, and FIG. The state which the body 57 and the fixed valve body 55 have left | separated is shown. 3 shows a fixed valve body, FIG. 3 (a) is a left side view thereof, FIG. 3 (b) is a sectional view taken along line AA of FIG. 3 (a), and FIG. 4 is a movable valve body. 4 (a) is a right side view thereof, and FIG. 4 (b) is a sectional view taken along line BB of FIG. 4 (a).

  The operation of the clutch pedal 10 is transmitted to the master cylinder 11 connected thereto, and the hydraulic fluid sent out from the master cylinder 11 flows into the slave cylinder 12 through the pipe 14 and the shock torque preventing valve device 20. The output rod 12a of the slave cylinder 12 is connected to the other end of a release fork 13 whose one end is connected to a clutch (not shown).

  The shock torque preventing valve device 20 is disposed on the hydraulic fluid passage 14 between the master cylinder 11 and the slave cylinder 12, and includes a valve device body 59 having an inner hole 50 having a circular cross section, and an inner hole 50. A fixed valve body 55 fixed inside, a movable valve body 57 housed in the inner hole 50 so as to be slidable in a direction to be separated from the fixed valve body 55, and a fixed valve body 55 attached to the movable valve body 57. And a spring 58 as an elastic member for applying a pressing force toward the side. The valve device main body 59 includes two main bodies 51a and 51b, and is configured by mounting the main body 51b on the slave cylinder side in the mounting hole 70 of the main body 51a on the master cylinder side. The fixed valve body 55 is fixed in a state of being sandwiched between both the main bodies 51a and 51b.

  A port (master cylinder side opening) 52b connected to the master cylinder 11 is provided in the main body 51a on the master cylinder side, and the port 52b and the inner hole 50 communicate with each other. The main body 51b on the slave cylinder side is provided with a port (slave cylinder side opening) 52a connected to the slave cylinder 12, and the port 52a communicates with the inner hole 50. The axial center of the inner hole 50 is in the left-right direction in FIG.

  As shown in FIG. 3, the fixed valve body 55 has a projecting portion 55c having a circular cross section on the port 52a side of the disc portion 55b, and has a large-diameter throttle hole 53a as a first throttle hole in the axial center portion. A plurality of (for example, twelve) valve holes 55a are provided at equal intervals on the same circumference of the disk portion 55b. The large-diameter throttle hole 53a is connected to the port 52a, and allows the working fluid to flow in both the recirculation direction in which the working fluid recirculates from the slave cylinder 12 to the master cylinder 11 and the opposite direction.

  A concave annular groove 55d is formed in the projecting portion 55c, and the annular groove 55d holds the inner peripheral side of the annular check valve 54. The valve hole 55a is located. The check valve 54 is made of an elastic material such as rubber, and the hydraulic fluid that has passed through the valve hole 55a in the reverse direction is bent and deformed so that the outer peripheral side swings to the port 52a side (right side in FIG. 1). open. Further, the check valve 54 is pressed against the peripheral portion of the valve hole 55a in the fixed valve body 55 by the pressure of the hydraulic fluid in the reflux direction to close the valve hole 55a. Therefore, by the action of the check valve 54, the flow of hydraulic fluid from the master cylinder 11 to the slave cylinder 12 through the valve hole 55a is allowed, while the return direction from the slave cylinder 12 to the master cylinder 11 through the valve hole 55a. The flow of hydraulic fluid to is blocked.

  The check valve 54 is bent and deformed within a certain range by a plurality of stopper portions 71 that project inwardly on the inner wall surface of the main body 51b and that have gaps for fluid flow between adjacent ones in the circumferential direction. (See FIGS. 1 and 2). Further, a guide portion 72 described later is provided on the movable valve body 57 side of the fixed valve body 55.

  As shown in FIG. 4, the movable valve body 57 has a wall 57b formed on one end side (the fixed valve body 55 side) of the cylindrical portion 57a, and a groove 63 extending in the axial direction is formed in the cylindrical portion 57a. Are provided at equal intervals in the circumferential direction. The groove 63 functions as a flow path in the present embodiment, and opens to a stepped portion 62 formed between the contact portion 60 and the outer periphery of the movable valve body 57, and on the inner side of the tubular portion 57a. Is also provided to open. Therefore, the working fluid can flow in both directions through the groove 63. The wall 57b is formed with a small-diameter throttle hole 53b as a second throttle hole through which the working fluid is passed in both directions through the axial center portion so as to pass through the axial center position of the contact portion 60. Note that it is not necessary to provide four grooves 63 as equal flow paths, and an arbitrary number of grooves 63 may be provided at arbitrary intervals as long as there is no problem in the flow of hydraulic fluid.

  As shown in FIG. 1, the small-diameter throttle hole 53b is connected to the port 52b, and is provided in a state facing the large-diameter throttle hole 53a at a position where the respective central axes coincide. Therefore, when the hydraulic fluid flows in the return direction from the slave cylinder 12 to the master cylinder 11, the movable valve element 57 is attached in a direction away from the fixed valve element 55 due to the differential pressure due to the pressure loss of the hydraulic fluid in the small diameter throttle hole 53b. As shown in FIG. 5, the urging pressing force works perpendicularly to the pressure receiving surface of the movable valve body 57 (the surface at the periphery of the small-diameter throttle hole 53b and inside the throttle hole 53a) 571. The inside of the inner hole 50 can be smoothly slid.

  A tapered portion 53c is formed on the periphery of the end of the large-diameter throttle hole 53a on the movable valve body 57 side so as to increase in diameter toward the movable valve body 57, and the small-diameter throttle hole 53b side of the fixed valve body 55 is formed. A taper portion 53d is formed on the periphery of the end portion in such a manner as to increase in diameter toward the fixed valve body 55 side.

  Further, the spring 58 is accommodated in the cylindrical portion 57a of the movable valve body 57 as shown in FIGS. The movable valve body 57 is biased toward the fixed valve body 55 by the elastic force of the spring 58. Therefore, the contact portion 60 of the movable valve body 57 that receives the elastic biasing force of the spring 58, that is, the peripheral portion of the throttle hole 53b, is the throttle hole 53a of the fixed valve body 55 when the elastic biasing force is larger than the pressing force. When the elastic biasing force is smaller than the pressing force, the fixed valve body 55 is separated. Along with this, the movable valve body 57 contacts and separates from the fixed valve body 55 in the axial direction. When the contact portion 60 is separated from the peripheral portion 60a, a gap 60b is formed between them (see FIG. 2).

  As shown in FIGS. 1 to 3, the guide portion 72 that guides the movable valve body 57 that contacts and separates from the fixed valve body 55 so that the positions of the throttle holes 53 a and 53 b coincide with each other is fixed as shown in FIGS. 1 to 3. The valve body 55 is provided on the movable valve body 57 side. In this embodiment, the guide part 72 includes three guide pieces 73 that are spaced apart from each other in the circumferential direction, and an opening 74 that functions as a part of the liquid passage is provided between the guide pieces 73. It has been. Each of the guide pieces 73 is formed in a circular arc shape that constrains the guided portion 75 provided on the fixed valve body 55 side of the movable valve body 57 from the radially outer side. A taper portion 73 a that becomes thinner toward the tip is formed inside the tip of each guide piece 73. The reason for providing the tapered portion 73a is to improve the assembling property of both valve bodies 55 and 57. The guided portion 75 is formed to have an outer diameter that can enter the inside of the plurality of guide pieces 73. The cylindrical portion 57 a on the opposite side of the guided portion 75 from the fixed valve body 55 has a larger diameter than the guided portion 75. The gap between the large-diameter cylindrical portion 57a and the inner hole 50 is made as small as possible to ensure the function of guiding the movable valve element 57 by the inner peripheral surface of the inner hole 50 (while providing the guided portion 75). . The tapered portion 73a provided at the tip of each guide piece 73 is such that the guided portion 75 that has come out of the guide portion 72 in the axial direction with the contact and separation between the movable valve body 57 and the fixed valve body 55 is again the guide portion 72. When entering, the guided portion 75 can be guided to be coaxial with the fixed valve body 55. However, when the tapered portion 73a is omitted, it is preferable to set the length of the guide piece 73 in the axial direction so that the guided portion 75 does not come out.

  Next, the operation of the shock torque preventing valve device 20 of the present invention and the function of the tapered portion provided in the guide portion and the throttle hole will be described.

  First, the operation when the clutch pedal is depressed and the connection between the engine and the transmission is disconnected will be described (see FIG. 1). When the clutch pedal is depressed, the hydraulic fluid is discharged from the master cylinder 11 and flows into the port 52b of the shock torque preventing valve device 20. The hydraulic fluid in the inner hole 50 is supplied to the small-diameter throttle hole 53 b and also to the valve hole 55 a through the groove 63 of the movable valve body 57. Then, the hydraulic fluid supplied to the small-diameter throttle hole 53b flows from the port 52a into the slave cylinder 12 through the large-diameter throttle hole 53a. On the other hand, the hydraulic fluid supplied to the valve hole 55a bends and deforms the check valve 54 toward the port 52a to open the valve hole 55a. At this time, when the amount of deformation of the check valve 54 exceeds a predetermined value, the outer peripheral portion comes into contact with the stopper portion 71. Thereby, the bending deformation of the check valve 54 is restricted. Then, the hydraulic fluid that has passed through the valve hole 55 a is supplied to the port 52 a side through the escape passage 72 and flows into the slave cylinder 12. As the hydraulic fluid flows into the slave cylinder 12 in this way, the connection between the engine and the transmission is disconnected via the output rod 12a and the release fork 13.

  Next, an operation when the depression of the clutch pedal is released and the engine and the transmission are connected will be described. In this case, the recirculating hydraulic fluid passes through different passages depending on whether the movable valve body 57 is in contact with the fixed valve body 55 or the movable valve body 57 is separated from the fixed valve body 55. The reason why the recirculating working fluid is configured to pass through different passages is to change the recirculating working fluid passage in accordance with the viscosity of the working fluid.

  First, for example, when the pressure of the hydraulic fluid received by the movable valve body 57 is smaller than the elastic force of the spring 58 because the viscosity of the hydraulic fluid is low, the movable valve body 57 contacts the fixed valve body 55. Yes. When the depression of the clutch pedal 10 is released, the release fork 13 is pushed leftward in the figure by a clutch unillustrated return spring, and the piston of the slave cylinder 12 is pushed in the same direction. Further, the piston of the master cylinder 11 is also returned to the initial position by a return spring (not shown). As a result, the working fluid is discharged from the slave cylinder 12 in the recirculation direction, and the recirculating working fluid flows into the port 52a of the shock torque preventing valve device 20 and reaches the check valve 54. Then, the check valve 54 is pressed against the peripheral portion of the valve hole 55a in the fixed valve body 55 by the pressure of the recirculating hydraulic fluid to close the valve hole 55a. Therefore, the hydraulic fluid flows out from the port 52a only through the passage formed by the large-diameter throttle hole 53a and the small-diameter throttle hole 53b (that is, receives sufficient throttle), and the hydraulic fluid flows into the small-diameter throttle hole 53b. The flow is returned to the master cylinder 11 in a limited state.

  On the other hand, for example, when the hydraulic fluid has a high viscosity and the pressing force due to the differential pressure of the hydraulic fluid received by the movable valve body 57 is larger than the elastic force of the spring 58, the movable valve body 57 is separated from the fixed valve body 55 by the pressing force. (See FIG. 2). When the depression of the clutch pedal is released, the working fluid is discharged from the slave cylinder 12 in the recirculation direction, and the recirculating working fluid flows into the port 52a of the shock torque preventing valve device 20 and reaches the check valve 54. . Then, the check valve 54 is pressed against the peripheral portion of the valve hole 55a in the fixed valve body 55 by the pressure of the recirculating hydraulic fluid to close the valve hole 55a. Since the movable valve element 57 is not in contact with the fixed valve element 55, in other words, the gap 60b exists, so that the hydraulic fluid has a gap 60b having a sufficient passage area from the port 52a and the large-diameter throttle hole 53a. Then, it flows out to the port 52b through the step portion 62 and the groove 63 (without much restriction), and is returned to the master cylinder 11 in a state where the flow of hydraulic fluid is restricted by the large-diameter restriction hole 53a.

  As described above, since the valve opening or closing (that is, when the movable valve body 57 is in contact with the fixed valve body 55 and away) is switched at an appropriate timing corresponding to the actual viscosity of the hydraulic fluid, The recirculating hydraulic fluid is recirculated to the master cylinder 11 while the flow rate is limited by the large-diameter throttle hole 53a or the small-diameter throttle hole 53b, and the shock torque is reliably prevented.

  Then, since the pressing force due to the differential pressure of the hydraulic fluid is smaller than the elastic force of the spring 58, the movable valve body 57 moves so as to contact the fixed valve body 55, but the guide portion of the fixed valve body 55 Since 72 guides the movable valve body 57, it is possible to effectively suppress the displacement of the axial position between the throttle holes 53a and 53b. At this time, since a plurality of (three in the above description) guide pieces 73 are provided as the guide portion 72 in this embodiment, the guided portion 75 of the movable valve element 57 is effectively provided from a plurality of directions and radially outside. Thus, the positional deviation between the throttle holes 53a and 53b can be reliably suppressed. Moreover, since the opening 74 functioning as a part of the liquid passage is secured between the guide pieces 73, that is, in the axial region of the guide portion 72, sufficient liquid passage is possible regardless of the presence of the guide portion 72. The flow area can be secured.

  In addition, since the tapered portion 53d is formed at the peripheral edge of the small diameter throttle hole 53b on the fixed valve body 55 side, the effective sectional area of the proper throttle is reduced while keeping the flow area of the small diameter throttle hole 53b small. Can be secured. In addition, the opening function of the small-diameter aperture hole 53b is enlarged by accommodating the aperture of the small-diameter aperture hole 53b inside the aperture of the large-diameter aperture hole 53a by the positioning function of both the aperture holes 53a and 53b by the guide portion 72. Thus, it is possible to prevent changes in the pressure receiving area and changes in the amount of restriction. Further, the tapered portion 53c is also provided in the large-diameter throttle hole 53a to increase the opening area toward the small-diameter throttle hole 53b, thereby opening the small-diameter throttle hole 53b in the large-diameter throttle hole 53a. Therefore, it is possible to more reliably prevent the change in the pressure receiving area and the change in the amount of restriction.

  In the above-described embodiment, the present invention is applied to a valve device separated from the slave cylinder. However, the present invention is not limited to this, and a valve device in which the slave cylinder 12 'and the valve body are integrated as shown in FIG. The same can be applied. In FIG. 6, reference numeral 80 is a flow path connected to the master cylinder, 81 is a flow path provided in the main body 51b 'in the radial direction (four in the illustrated example), 82 is the outer periphery of the main body 51b' and the main body 51a. ′, A passage (not shown) on the slave cylinder 12 ′ side is communicated with the gap 82, and the passage (not shown) and the flow path 81 The hydraulic fluid flows between the slave cylinder 12 ′ and the valve device via the gap 82. Other parts are configured in the same manner as in FIG. However, FIG. 6 shows a type without the stopper portion 71.

  Moreover, in embodiment mentioned above, although the groove | channel provided in the movable valve body is used as a flow path, this invention is not limited to this. For example, a through hole connected to the gap (60b) may be provided in the main body on the master cylinder side, and the through hole may be used as a flow path.

  Moreover, although it has set as the structure which provided the three guide pieces as a guide part in embodiment mentioned above, this invention is not limited to this. For example, a guide piece may be provided in an arbitrary number of 2 or more, and an opening that functions as a part of the liquid passage may be provided between the guide pieces. Alternatively, the guide may have a hole or a hole in a cylindrical shape. It is good also as a structure which provided the long hole etc. as the opening part.

  Further, in the above-described embodiment, the check valve and the valve hole opened and closed by this are provided in the fixed valve body, but the present invention can also be applied to those in which these are omitted. In such a case, the valve device of the present invention is used when preventing shock torque, and the valve device having no throttle action is used in other cases, for example, the valve device of the present invention and the valve device having no throttle action. It is possible to cope with such a configuration by connecting in parallel and switching the passage of the hydraulic fluid.

It is front sectional drawing of the valve apparatus for shock torque prevention which concerns on one Embodiment of this invention (state which the movable valve body and the fixed valve body are contact | abutting). It is a front sectional view of the valve device for shock torque prevention concerning one embodiment of the present invention (state where a movable valve element and a fixed valve element are separated). A fixed valve body is shown, (a) is the left view, (b) is sectional drawing by the AA of (a). A movable valve body is shown, (a) is the right view, (b) is sectional drawing by the BB line of (a). It is front sectional drawing which shows both throttle holes in the state which both valve bodies contact | abutted. FIG. 6 is a front sectional view showing a shock torque preventing valve device according to another embodiment of the present invention, in which a valve body is integrated with a slave cylinder. It is front sectional drawing of the conventional shock torque prevention valve (a state with which the movable valve body and the fixed valve body are contact | abutting). It is a front sectional view of the conventional shock torque prevention valve (a state where a movable valve element and a fixed valve element are separated). It is front sectional drawing which shows both throttle holes in the state which both valve bodies in the conventional shock torque prevention valve contact | abutted.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Clutch pedal 11 Master cylinder 12 Slave cylinder 14 Passage 20 Shock torque prevention valve device 50 Inner hole 53a Large diameter throttle hole (first throttle hole)
53b Small diameter throttle hole (second throttle hole)
53c Taper part 53d Taper part 55 Fixed valve body 57 Movable valve body 59 Valve device main body (valve main body)
63 groove (liquid passage)
72 Guide part 73 Guide piece 73a Taper part 74 Opening part (part of liquid passage)
75 Guided part

Claims (9)

Between the master cylinder operated by the clutch pedal and the slave cylinder that moves the clutch by the hydraulic pressure of the hydraulic fluid. A shock torque preventing valve device for preventing a shock torque of the clutch by restricting a flow rate,
A valve body having a slave cylinder side opening and a master cylinder side opening on the passage, and having an inner hole communicating with both openings ,
A fixed valve body having a first throttle hole fixed in the inner hole of the valve body and connected to the slave cylinder side opening;
A movable toward and away from with respect to the fixed valve body slidably disposed within said bore of said valve body, and with a second throttle bore leading to the master cylinder side opening in the stationary valve body side, the A movable valve body having a second throttle hole smaller than the first throttle hole and a peripheral part of the second throttle hole provided at a position facing the peripheral part of the first throttle hole ;
When the movable valve body approaches the fixed valve body, the peripheral portion of the second throttle hole in the movable valve body comes into contact with the peripheral portion of the first throttle hole in the fixed valve body, and the movable valve body When the valve body is separated from the fixed valve body, the peripheral portion of the second throttle hole is separated from the peripheral portion of the first throttle hole, and the peripheral portion of the second throttle hole is The reflux hydraulic fluid flowing through the first throttle hole in contact with the peripheral part of the first throttle hole flows to the master cylinder side opening only through the second throttle hole, while the peripheral part of the second throttle hole is the first part. The recirculating hydraulic fluid flowing through the first throttle hole flows to the master cylinder side opening through a liquid passage provided separately from the gap between the valve bodies and the second throttle hole in a state of being separated from the peripheral portion of the throttle hole. And
Wherein the stationary valve member, the guide portion is provided so as to guide the stationary valve body side, wherein the second throttle hole is provided in the movable valve body to protrude along the axial direction of the fixed valve body, the guide A clutch shock torque characterized in that a portion guides the movable valve body on the fixed valve body side so that the axial center position of the second throttle hole matches the axial center position of the first throttle hole. Valve device for prevention.   2. The valve device for preventing shock torque of a clutch according to claim 1, wherein the guide portion has a shape that restrains the movable valve body from a radially outer side, and an axial region in which the guide portion is provided. 3. A valve device for preventing shock torque of a clutch, characterized in that a part of the fluid passage is secured in the inside so as to allow the flow of hydraulic fluid between the radially inner side and the outer side of the guide portion.   3. The valve device for preventing shock torque of a clutch according to claim 2, wherein the guide portion has a plurality of guide pieces spaced from each other in the circumferential direction, and a part of the liquid passage is each guide piece. A valve device for preventing shock torque of a clutch, wherein the valve device is provided between the two.   4. The valve device for shock torque prevention of a clutch according to claim 3, wherein each of the guide pieces protrudes from the fixed valve body toward the movable valve body, and the movable valve body is formed at a portion on the fixed valve body side. A valve device for preventing shock torque of a clutch, comprising a guided portion having a diameter smaller than that of other portions and having a diameter capable of entering the inside of the guide piece. 5. The valve device for shock torque prevention of the clutch according to claim 3 , wherein an end peripheral edge of the second throttle hole on the fixed valve body side is formed in a taper shape in a direction in which the diameter increases toward the fixed valve body side. A valve device for preventing shock torque of a clutch.   6. The valve device for preventing shock torque of a clutch according to claim 5, wherein the peripheral edge of the first throttle hole on the side of the movable valve body is formed in a taper shape in such a direction that the diameter increases toward the side of the movable valve body. Valve device for preventing shock torque of clutch.   The valve device for shock torque prevention of the clutch according to any one of claims 3 to 6, characterized in that the inner end of the guide piece on the movable valve body side is formed in a tapered shape that becomes thinner toward the tip. Valve device for preventing shock torque of clutch. 3. The valve device for preventing shock torque of a clutch according to claim 1 or 2, wherein the peripheral edge of the second throttle hole on the fixed valve body side is formed in a taper shape in which the diameter increases toward the fixed valve body side. A valve device for preventing shock torque of a clutch. 9. The valve device for shock torque prevention of a clutch according to claim 8, wherein the peripheral edge of the first throttle hole on the movable valve body side is formed in a taper shape in such a direction that the diameter increases toward the movable valve body side. Valve device for preventing shock torque of clutch.

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