JP2014114933A - Transmission for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique effective for simplifying a structure in a transmission for a vehicle including a mechanism for making a seamless shift between a low-speed-side gear shift stage and a high-speed-side gear shift stage.SOLUTION: A power transmission mechanism 101 of a transmission for a vehicle of this invention includes a first engaged member 110 provided so as to be relatively rotatable with a first idling gear G1o to an output shaft A3, and a second engaged member 120 provided so as to be relatively rotatable with a second idling gear G2o. Driving devices 137, 150 and ACT2 selectively establish any mode of a low-speed mode in which a first connection piece 131 is positioned in a connection position of the connection piece and a second connection piece 134 is positioned in a connection release position of the connection piece, a high-speed mode in which the first connection piece 131 is positioned in a connection release position of the connection piece and the second connection piece 134 is positioned in a connection position of the connection piece, and an intermediate mode in which both of the first connection piece 131 and the second connection piece 134 are positioned in the connection position of the connection pieces.

Description

  The present invention relates to a vehicle transmission.

  Japanese Translation of PCT International Application No. 2010-510464 (Patent Document 1) discloses an example of a vehicle transmission. In this transmission, one engagement member (engagement element set) that can be engaged with a first engaged member (drive structure) provided on the low-speed side gear and the high-speed side gear are provided. The other engaging member (engaging element set) that can be engaged with the second engaged member (driving structure) is used, and each of these two engaging members (engaging element set) The engagement member is configured to be independently driven in the axial direction by a dedicated drive member and actuator. According to this configuration, the drive of each engagement member is controlled by the actuator, so that the other engagement member is moved from the low-speed side gear stage in which one engagement member is engaged with the first engaged member. 2. It is possible to instantaneously change to the high speed side gear stage engaged with the engaged member, thereby achieving a so-called “seamless shift” in which the driving torque is not interrupted.

Special table 2010-510464 gazette

  The vehicle transmission described in Patent Document 1 requires a driving member and an actuator for each of the two engaging members, which complicates the structure and is disadvantageous with respect to assembly man-hours, weight, cost, and the like. Therefore, when designing this type of vehicle transmission, a request to reduce the number of assembly steps, weight, cost, etc., related to the vehicle transmission by simplifying the structure for achieving the aforementioned seamless shift. There is.

  The present invention has been made in view of the above points, and is intended to simplify the structure of a vehicle transmission including a mechanism that performs a seamless shift between a low speed gear and a high speed gear. The purpose is to provide effective technology.

  In order to achieve this object, a vehicle transmission according to the present invention is interposed in a power transmission system connecting a drive output shaft of a vehicle drive source and a drive wheel of the vehicle, and has a plurality of shift stages. An input shaft, an output shaft, a plurality of fixed gears, a plurality of idle gears, an engaging member, a first engaged member, a second engaged member, a first connecting piece, a second connecting piece, and a driving device It has.

  The input shaft is a shaft that forms a power transmission system with the drive output shaft. The output shaft is a shaft that forms a power transmission system with the drive wheels. The plurality of fixed gears are gears corresponding to each of the plurality of shift stages, each being provided coaxially with the input shaft or the output shaft and not relatively rotatable. Each of the plurality of idle gears is a gear that is coaxially and relatively rotatable with the input shaft or the output shaft, and that corresponds to each of the plurality of shift speeds and that is always meshed with a fixed gear of the corresponding shift speed. is there. The plurality of idle gears includes a first idle gear that is always meshed with a fixed gear of the low speed side gear stage and a fixed high speed side gear stage for the low speed side gear stage and the high speed side gear stage of the plurality of gear stages. And a second idler gear that always meshes with the gear.

  The engaging member is coaxial between the first idler gear and the second idler gear of the shaft on which both the first idler gear and the second idler gear of the input shaft and the output shaft are provided. The relative rotation is impossible. The 1st to-be-engaged member is provided in the opposing part with an engagement member among 1st free-wheeling gears so that relative rotation with the 1st free-wheeling gear with respect to the said axis | shaft is possible. The second engaged member is provided at a portion of the second idler gear facing the engagement member so as to be rotatable relative to the shaft together with the second idler gear. Both the first connecting piece and the second connecting piece are provided on the engaging member. Specifically, the first connecting piece is provided to the engaging member so as to be movable between a connecting position for connecting the engaging member and the first engaged member, and a connection releasing position deviating from the connecting position. Yes. The second connecting piece is movably provided on the engaging member between a connecting position for connecting the engaging member and the second engaged member, and a connection releasing position deviating from the connecting position. Each of the first connection piece and the second connection piece may have a structure that moves between a connection position and a connection release position by a rotation operation, or may be connected to the connection position by a slide operation in one or more directions. The structure which moves between release positions may be sufficient.

  The driving device functions to drive each of the first connecting piece and the second connecting piece. This drive device selectively achieves any one of a low speed mode, a high speed mode, and an intermediate mode. In the low-speed mode, the first connection piece is located at the connection position of the connection piece, and the second connection piece is located at the connection release position of the connection piece. In the high-speed mode, the first connection piece is located at the connection release position of the connection piece, and the second connection piece is located at the connection position of the connection piece. In the intermediate mode, both the first connecting piece and the second connecting piece are located at the connecting position of the connecting piece between the low speed mode and the high speed mode. That is, in this intermediate mode, a double engagement state is formed in which the engagement member is engaged with each of the first engaged member and the second engaged member. As a result, the driving device is controlled from the low speed mode to the high speed mode through the intermediate mode, or from the high speed mode to the low speed mode through the intermediate mode, so that the driving torque can be changed without interruption. Seamless shift) is achieved.

  In this case, since the engaging member is also used as an object to be engaged with both the first engaged member and the second engaged member, the structure for achieving the seamless shift can be simplified. In particular, by using the first connecting piece and the second connecting piece provided on the engaging member, it is necessary to newly provide a member for achieving a seamless shift on the first engaged member and the second engaged member. Therefore, the structure can be further simplified. As a result, it is possible to reduce assembly man-hours, weight, cost, and the like related to the vehicle transmission.

  In the above vehicle transmission, the engaging member is formed in a disc shape, and each of the first connecting piece and the second connecting piece is centered on a rotating shaft provided on the outer peripheral surface of the engaging member. It is preferable to be able to rotate between the connection position and the connection release position. Thereby, a seamless shift can be achieved using the structure in which the first connecting piece and the second connecting piece provided on the engaging member rotate.

  In the above vehicle transmission, the drive device preferably includes a fork shaft driven by an actuator and a movable member connected to the fork shaft so as to be movable in the axial direction of the shaft. Further, it is preferable that the movable member is selectively set to any one of a neutral position, a first setting position, and a second setting position by driving the fork shaft. The neutral position is defined as a position between the first connection piece and the second connection piece, each in the connection release position. The first setting position is defined as a position that prevents the first connection piece from returning from the connection position to the connection release position. The movable member can be set to the first setting position in the low speed mode. The second set position is defined as a position that prevents the second connecting piece from returning from the connection position to the connection release position. The movable member can be set at the second setting position in the high speed mode. In particular, since one fork shaft and the movable member also serve as means for driving both the first connecting piece and the second connecting piece, the structure can be further simplified. Further, by providing a neutral position as the setting position of the movable member, for example, after setting the movable member to the first setting position at the time of the first speed shift or after setting the movable member to the second setting position at the time of the second speed shift, By setting to the neutral position, it is possible to shift from the first speed or the second speed to another speed without any problem.

  In the above-described vehicle transmission, the first engaged member and the second engaged member are each an engaged recessed portion provided at a portion facing the engaging member, and a recessed portion inclination that constitutes the engaged recessed portion. And a surface. Further, each of the first connecting piece and the second connecting piece engages with an engaged recess of the first engaged member or the second engaged member when moved to the connecting position of the connecting piece. It is preferable to provide a part and the convex inclined surface which comprises the said engaging convex part. In this case, the drive device causes the concave inclined surface of the engaged member to be connected by the relative rotation difference between the engaged member and the engaging member corresponding to the first connecting piece or the second connecting piece at the connecting position. The convex slope of the piece is pressed to move the connecting piece from the connecting position to the connecting release position. Accordingly, the first connection piece or the second connection piece is easily moved from the connection position to the connection release position by using the relative rotation operation of the first engagement member or the second engagement member and the engagement member. Can be made.

  In the above vehicle transmission, the drive device preferably includes an elastic member that elastically biases each of the first connection piece and the second connection piece from the connection position of the connection piece toward the connection release position. Thereby, each of the 1st connection piece and the 2nd connection piece can be reliably moved from a connection position to a connection release position using the elastic biasing force of an elastic member, and smoothing of a seamless shift can be aimed at. .

  As described above, according to the present invention, it is possible to simplify the structure of a vehicle transmission including a mechanism that performs a seamless shift between a low speed gear and a high speed gear. It was.

It is a figure showing a schematic structure of transmission T / M concerning an embodiment of the present invention. It is a figure which shows typically the power transmission mechanism 101 in FIG. FIG. 3 is a partially enlarged view of a power transmission mechanism 101 in FIG. 2. It is a figure which shows the engagement state of the to-be-engaged members 110 and 120 and the engaging member 130 when the gear stage of transmission T / M is 1st speed. It is the elements on larger scale of the power transmission mechanism 101 in FIG. It is a figure which shows the engagement state of the to-be-engaged members 110 and 120 and the engaging member 130 in the process in which the gear stage of transmission T / M is changed from 1st speed to 2nd speed. It is the elements on larger scale of the power transmission mechanism 101 in FIG. It is a figure which shows the engagement state of the to-be-engaged members 110 and 120 and the engaging member 130 when the gear stage of transmission T / M is 2nd speed. It is the elements on larger scale of the power transmission mechanism 101 in FIG.

  Hereinafter, a vehicle transmission according to an embodiment of the present invention will be described with reference to the drawings. A transmission T / M (for a vehicle) according to an embodiment of the present invention is interposed in a power transmission system that connects a drive output shaft of an engine, which is a drive source of a vehicle, and a drive wheel of the vehicle, and is used for vehicle advancement. There are two shift speeds (1st speed (1st) to 5th speed (5th)) and one shift speed (reverse) for vehicle reverse travel.

  As shown in FIG. 1, the transmission T / M includes an input shaft A2 and an output shaft A3. The input shaft A2 of the transmission T / M is connected to the drive output shaft A1 of the engine E / G via the clutch C / D and the flywheel F / W. A power transmission system is formed between the input shaft A2 and the drive output shaft A1 of the engine E / G. An output shaft A3 of the transmission T / M is connected to a drive wheel D / W of the vehicle via a differential D / F. A power transmission system is formed between the output shaft A3 and the drive wheels D / W. In FIG. 1, for the sake of convenience, the description of the reverse gear for vehicle reverse (reverse) is omitted. This transmission T / M corresponds to the “vehicle transmission” of the present invention. The input shaft A2 and the output shaft A3 correspond to the “input shaft” and “output shaft” of the present invention, respectively.

  The clutch C / D is a friction clutch disk having one of well-known configurations provided to rotate integrally with the input shaft A2 of the transmission T / M. More specifically, the clutch C / D (more precisely, the clutch disc) faces each other with respect to the flywheel F / W provided to rotate integrally with the output shaft A1 of the engine E / G. It is arranged coaxially. The axial position of the clutch C / D (more precisely, the clutch disc) with respect to the flywheel F / W can be adjusted. The axial position of the clutch C / D is adjusted by the clutch actuator ACT1. The clutch C / D does not include a clutch pedal operated by the driver.

  The transmission T / M includes a plurality of fixed gears (also referred to as “driving gears”) G1i, G2i, G3i, G4i, and G5i, and a plurality of idle gears (also referred to as “driven gears”) G1o, G2o, G3o, and G4o. , G5o. The plurality of fixed gears G1i, G2i, G3i, G4i, and G5i are each fixed to the input shaft A2 coaxially and relatively unrotatably, and each fixed to the input shaft A2 so as not to move relative to each other. It corresponds to each of a plurality of forward gears. Specifically, these fixed gears G1i, G2i, G3i, G4i, and G5i correspond to first speed, second speed, third speed, fourth speed, and fifth speed, respectively. Each of the plurality of idle gears G1o, G2o, G3o, G4o, G5o is provided coaxially with the output shaft A3 so as to be relatively rotatable, and each corresponds to each of the plurality of forward shift stages, Is always meshed with the fixed gear of the corresponding gear stage. Specifically, these idle gears G1o, G2o, G3o, G4o, and G5o correspond to the first speed, the second speed, the third speed, the fourth speed, and the fifth speed, respectively.

  The transmission T / M includes power transmission mechanisms 101, 102, and 103, and the change and setting of the shift speed is performed by operating each of the power transmission mechanisms 101, 102, and 103 using the transmission actuator ACT2. Is done. By changing the gear position, the reduction ratio (ratio of the rotational speed of the input shaft A2 to the rotational speed of the output shaft A3) is adjusted.

  The control device 200 includes an accelerator opening sensor S1, a shift position sensor S2, a brake sensor S3, and an electronic control unit ECU. The accelerator opening sensor S1 is a sensor that detects an operation amount (accelerator opening) of the accelerator pedal AP. The shift position sensor S2 is a sensor that detects the position of the shift lever SF. The brake sensor S3 is a sensor that detects whether or not the brake pedal BP is operated. The electronic control unit ECU controls the actuators ACT1 and ACT2 based on information from the above-described sensors S1 to S3 and other sensors, etc., so that the C / D clutch stroke (accordingly, clutch torque) is controlled. And the gear stage of the transmission T / M is controlled. The electronic control unit ECU controls the drive torque of the output shaft A1 of the engine E / G by controlling the fuel injection amount (throttle valve opening) of the engine E / G.

  Since the power transmission mechanisms 101, 102, and 103 all have the same structure, here, the characteristics of the structure of the power transmission mechanism 101 alone will be described with reference to FIGS.

  As shown in FIG. 2, the power transmission mechanism 101 supports a first speed that is a relatively low speed shift stage among a plurality of shift speeds and a second speed that is a high speed shift stage with respect to the first speed. doing. The power transmission mechanism 101 includes a first idle gear G1o, a second idle gear G2o, a first engaged member 110, and a second engaged gear, which are provided on the output shaft A3 of the transmission T / M. The member 120 and the engaging member 130 are included.

  The idle gears G1o and G2o are both prevented from moving in the axial directions X1 and X2 of the output shaft A3 by the snap ring 140 (fixing means), and are relatively rotated in the axial directions Y1 and Y2 with respect to the output shaft A3. Is possible. The first idle gear G1o always meshes with the first-speed fixed gear G1i, and the second idle gear G2o always meshes with the second-speed fixed gear G2i. The first idle gear G1o and the second idle gear G2o correspond to the “first idle gear” and the “second idle gear” of the present invention, respectively.

  The engaging member 130 is formed in a disc shape, and is provided coaxially and relatively unrotatably by spline fitting between the first idle gear G1o and the second idle gear G2o of the output shaft A3. The engaging member 130 is immovable in the axial directions X1 and X2 of the output shaft A3 by a fixing means similar to the snap ring 140 described above. Therefore, the engaging member 130 always rotates together with the output shaft A3 when rotating in the directions Y1 and Y2 around the output shaft A3. The engaging member 130 corresponds to the “engaging member” of the present invention.

  The first engaged member 110 can rotate relative to the output shaft A3 in the direction around the axis Y1, Y2 together with the first idle gear G1o at a portion facing the engagement member 130 of the first idle gear G1o. Is attached. Similarly, the second engaged member 120 is disposed in a direction around the axis Y1, Y2 together with the second idler gear G1o with respect to the output shaft A3 at a portion facing the engagement member 130 of the second idler gear G2o. It is mounted so that it can be rotated relative to it. The first engaged member 110 and the second engaged member 120 correspond to the “first engaged member” and the “second engaged member” of the present invention, respectively.

  A concave portion is provided at one or a plurality of locations in the circumferential direction on the outer peripheral surface of the engaging member 130, and a pair of first connecting piece 131 and second connecting piece 134 are provided in the concave portion. Therefore, when there is one recess, a set of first connection pieces 131 and second connection pieces 134 are provided, and when there are a plurality of recesses, a plurality of sets of first connection pieces 131 and second connection pieces 134 are provided. It is done. Each of the first connection piece 131 and the second connection piece 134 is connected by a movable member 137 to a connection position where the corresponding engaged member and the engagement member 130 are connected, and a connection release position (“initial stage” deviated from the connection position). (Also called “position”). The first connecting piece 131 connects the first engaged member 110 and the engaging member 130 by engaging with the first engaged member 110 at the connecting position. Further, the first connection piece 131 releases the connection between the first engaged member 110 and the engagement member 130 by releasing the engagement with the first engaged member 110 at the connection release position. Similarly, the 2nd connection piece 134 connects the 2nd to-be-engaged member 120 and the engagement member 130 by engaging with the 2nd to-be-engaged member 120 in the connection position. Further, the second connection piece 134 releases the connection between the second engaged member 120 and the engagement member 130 by releasing the engagement with the second engaged member 120 at the connection release position. The first connecting piece 131 and the second connecting piece 134 correspond to the “first connecting piece” and the “second connecting piece” of the present invention, respectively.

  The movable member 137 is configured as an annular member disposed on the outer periphery of the engaging member 130, and can move in the axial directions X1 and X2 of the output shaft A3, and the axial directions Y1 and Y2 of the output shaft A3. In this case, relative rotation with the engaging member 130 is impossible. Therefore, the movable member 137 can rotate together with the engaging member 130 in the directions Y1 and Y2 around the output shaft A3. The movable member 137 includes a convex portion 138 that can contact each of the first connecting piece 131 and the second connecting piece 134, and a concave portion 139 for connecting the fork shaft 150. Therefore, when the fork shaft 150 is driven in the axial directions X1 and X2 by the transmission actuator ACT2, the movable member 137 connected to the fork shaft 150 is also driven in the axial directions X1 and X2.

  Specifically, the movable member 137 is selectively set to any one of a neutral position (also referred to as “neutral position”), a first setting position, and a second setting position. The neutral position is defined as a position between the first connecting piece 131 and the second connecting piece 134, each in the connection release position. The first setting position is defined as a position that prevents the first connection piece 131 from returning from the connection position to the connection release position. The second setting position is defined as a position that prevents the second connection piece 134 from returning from the connection position to the connection release position. Thereby, the 1st connection piece 131 and the 2nd connection piece 134 are driven between the above-mentioned connection position and connection release position, respectively. In this case, the movable member 137, the fork shaft 150, and the transmission actuator ACT2 constitute a drive device (the “drive device” of the present invention) for driving each of the first connection piece 131 and the second connection piece 134. Yes. The movable member 137 and the fork shaft 150 here correspond to the “movable member” and the “fork shaft” of the present invention, respectively.

  FIG. 3 is referred to for the detailed structure of the first connecting piece 131 and the second connecting piece 134 described above.

  As shown in FIG. 3, the first connection piece 131 is configured to be rotatable about a rotation shaft 132 provided on the engagement member 130, and is connected from the connection position in the arrow direction in the figure by a spring 133. It is always elastically biased toward the release position. The spring 133 is typically configured as a coil spring or a leaf spring. This spring 133 corresponds to the “elastic member” of the present invention. In the first connecting piece 131, when the rotation shaft 132 side is a base end portion, an engaging convex portion 131a on the side opposite to the base end portion is configured to be sharp. That is, the engaging convex portion 131a includes a convex horizontal surface 131b extending in the longitudinal direction of the first connecting piece 131 and a convex inclined surface 131c extending so as to intersect the convex horizontal surface 131b.

  When the convex portion 138 of the movable member 137 at the neutral position in FIG. 3 moves to the first setting position in the axial direction X1 of the output shaft A3, the first connection piece 131 moves from the connection release position in FIG. The convex portion 138 prevents the elastic member from rotating toward the first engaged member 110 around the rotation shaft 132 against the elastic urging force and returning to the connection release position. On the other hand, of the first engaged member 110, the engaged recessed portion 111 having the recessed inclined surface 111 a is engaged with the engaging convex portion 131 a of the first connecting piece 131 at the portion facing the engaging member 130. It is provided as possible. The shape of the engaged concave portion 111 substantially matches the shape of the engaging convex portion 131a including the convex horizontal surface 131b and the convex inclined surface 131c. Therefore, when the first connecting piece 131 rotates to the first engaged member 110 side to the connecting position and the engaging convex portion 131a engages with the engaged concave portion 111 of the first engaged member 110, 1 The engaged member 110 and the engaging member 130 are prevented from rotating relative to each other in the directions Y1 and Y2 around the output shaft A3, and can rotate together with the output shaft A3.

  Similarly, the second connection piece 134 is configured to be rotatable about a rotation shaft 135 provided on the engagement member 130, and is directed from the connection position to the connection release position in the direction of the arrow in the drawing by a spring 136. Is always elastically biased. The spring 136 is typically configured as a coil spring or a leaf spring. This spring 136 corresponds to the “elastic member” of the present invention. When the second connecting piece 134 has the rotating shaft 135 side as a base end portion, an engaging convex portion 134a on the opposite side to the base end portion is configured to be sharp. That is, the engaging convex portion 134a includes a convex horizontal surface 134b extending in the longitudinal direction of the second connecting piece 134 and a convex inclined surface 134c extending so as to intersect the convex horizontal surface 134b.

  When the convex portion 138 of the movable member 137 in the neutral position moves to the second set position in the axial direction X2 of the output shaft A3, the second connecting piece 134 is moved from the connection release position in FIG. 3 to the elastic biasing force of the spring 136. In contrast, the projection 138 is prevented from rotating toward the second engaged member 120 around the rotation shaft 135 and returning to the connection release position. On the other hand, the engaged recessed portion 121 having the recessed portion inclined surface 121a is engaged with the engaging convex portion 134a of the second connecting piece 134 at the portion facing the engaging member 130 of the second engaged member 120. It is provided as possible. The shape of the engaged concave portion 121 substantially matches the shape of the engaging convex portion 134a including the convex horizontal surface 134b and the convex inclined surface 134c. Therefore, when the second connecting piece 134 rotates to the second engaged member 120 side to the connecting position and the engaging convex portion 134a engages with the engaged concave portion 121 of the second engaged member 120, 2. The engaged member 120 and the engaging member 130 are prevented from rotating relative to each other in the directions Y1 and Y2 around the output shaft A3, and can rotate together with the output shaft A3.

  Hereinafter, a control mode of the power transmission mechanism 101 having the above-described configuration, particularly a control mode when the gear stage of the transmission T / M is changed from the relatively low speed 1st speed to the relatively high speed 2nd speed, This will be described with reference to FIGS. This control is performed by the electronic control unit ECU of the control device 200 controlling the transmission actuator ACT2. Accordingly, at least one of the following low speed mode, high speed mode, and intermediate mode is selectively achieved.

(Low speed mode)
In the low speed mode, the gear position of the transmission T / M is set to the first speed. In this case, as shown in FIG. 4, when the fork shaft 150 is driven in the axial direction X1 by the transmission actuator ACT2, the convex portion 138 of the movable member 137 is first moved in the axial direction X1 from the neutral position in FIG. Move to the set position. Thereby, the engaging member 130 is engaged with the first engaged member 110 via the first connecting piece 131 driven by the convex portion 138 of the movable member 137. On the other hand, the second connecting piece 134 is not driven by the convex portion 138 of the movable member 137 and is maintained at the connection release position in FIG. 3, so that the engaging member 130 is engaged with the second engaged member 120. Do not match. This low speed mode corresponds to the “low speed mode” of the present invention.

  In this low speed mode, as shown in FIG. 5, the first connecting piece 131 is pressed in the axial direction X <b> 1 by the convex portion 138 of the movable member 137, so that the first engaged member is centered on the rotating shaft 132. It rotates to the connection position which connects 110 and the engaging member 130. FIG. In this connection position, the engagement convex portion 131a of the first connection piece 131 engages (engages) with the engagement concave portion 111 of the first engaged member 110, and the rotational operation moves from this connection position toward the connection release position. Is blocked by the convex portion 138 of the movable member 137. Therefore, relative rotation in the directions Y1 and Y2 around the axis of the first engaged member 110 and the engaging member 130 is prevented. As a result, when the first engaged member 110 rotates together with the first idle gear G1o in the axial direction Y1, the engaging member 130 is integrated with the first engaged member 110 in the axial direction Y1. Rotate. On the other hand, the second connection piece 134 is not pressed in the axial direction X2 by the convex portion 138 of the movable member 137, and is positioned at a connection release position where the second engaged member 110 and the engagement member 130 are not connected. Therefore, the engaging member 130 does not rotate integrally with the second engaged member 120. When the first idle gear G1o rotates at a predetermined rotational speed (also referred to as “angular speed”) ω and the second idle gear G2o rotates at 2ω, which is twice the rotational speed, the first engaged gear The combined member 110 and the engaging member 130 rotate at the same rotational speed ω together with the output shaft A3. As a result, the rotation of the input shaft A2 is transmitted to the output shaft A3 only through the first idle gear G1o, and a power transmission system having a first speed reduction ratio is formed.

  In this case, the acceleration torque of the engine E / G generated during normal traveling of the vehicle (that is, the acceleration torque of the idle gear G1o) is transmitted to the engagement member 130 via the torque transmission path T1. In the torque transmission path T1, the acceleration torque is transmitted to the first connecting piece 131 through the convex horizontal surface 131b pressed by the engaged concave portion 111 of the first engaged member 110, and further, the first connecting piece 131. Is transmitted to the engaging member 130 through the convex portion 138 of the movable member 137. In contrast, the deceleration torque of the engine E / G generated during engine braking (that is, the deceleration torque of the first engaged member 110) is transmitted to the engagement member 130 via the torque transmission path T2. In the torque transmission path T2, the deceleration torque is transmitted to the first connecting piece 131 via the convex inclined surface 131c pressed by the engaged concave portion 111 of the first engaged member 110, and further this first connecting piece. 131 is transmitted to the engaging member 130 via the convex portion 138 of the movable member 137.

(Intermediate mode)
The intermediate mode is formed in the process (transition state) in which the gear stage of the transmission T / M shifts from the first speed to the second speed. In this intermediate mode, as shown in FIG. 6, the fork shaft 150 is driven in the axial direction X2 by the transmission actuator ACT2 following the low speed mode described above, whereby the movable member 137 reaches the second set position in the axial direction X2. Moving. Thereby, the engaging member 130 is engaged with the second engaged member 120 via the second connecting piece 134 driven by the convex portion 138 of the movable member 137. On the other hand, the state in which the engaging member 130 is engaged with the first engaged member 110 is maintained. That is, in this intermediate mode, the engagement member 130 is temporarily engaged with both the first engaged member 110 and the second engaged member 120 (also referred to as “double engagement state”). ) Is formed.

  In this intermediate mode, as shown in FIG. 7, the second connecting piece 134 is pressed in the axial direction X2 by the convex portion 138 of the movable member 137, whereby the second engaged member around the rotation shaft 135. It rotates to the connection position which connects 120 and the engaging member 130. In this connection position, the engagement convex part 134a of the second connection piece 134 engages (engages) the engagement recessed part 121 of the second engaged member 120, and the rotational operation moves from this connection position toward the connection release position. Is blocked by the convex portion 138 of the movable member 137. Therefore, relative rotation in the directions Y1 and Y2 around the axis of the second engaged member 120 and the engaging member 130 is prevented. As a result, when the second engaged member 120 rotates together with the second idle gear G2o in the axial direction Y1, the engaging member 130 is integrated with the second engaged member 120 in the axial direction Y1. Rotate. On the other hand, the engaging member 130 temporarily rotates together with the first engaged member 110. As a result of the second engaged member 120 engaging with the engaging member 130, the rotational speed of the second engaged member 120 is halved from 2ω to ω (deceleration). Further, the rotational speed of the second idle gear G2o that rotates together with the second engaged member 120 is also halved from 2ω to ω. Accordingly, the rotation of the second idle gear G2o is transmitted to the first idle gear G1o via the fixed gear G2i, the input shaft A2, and the fixed gear G1i, whereby the first idle gear G1o and the first idle gear G1o are transmitted. The rotational speed of the engaged member 110 is halved from ω to (½) ω (deceleration). In this case, the rotation of the input shaft A2 is temporarily transmitted to the output shaft A3 via both the first idle gear G1o and the second idle gear G2o. In this case, the acceleration torque of the engine E / G generated during normal traveling of the vehicle is temporarily transmitted to the torque transmission path T1 (path indicated by a two-dot chain line) related to the first idle gear G1o and the second idle gear G2o. The torque is transmitted to the engagement member 130 via both of the torque transmission paths T3 (paths indicated by solid lines). This intermediate mode corresponds to the “intermediate mode” of the present invention.

(High speed mode)
In the high speed mode, the gear stage of the transmission T / M is set to the second speed. In this case, as shown in FIG. 8, the positions of the fork shaft 150 and the movable member 137 are maintained. Thereby, the engagement member 130 is maintained in a state of being engaged with the second engaged member 120 via the second connecting piece 134. On the other hand, the rotational speed of the first engaged member 110 is halved from ω to (½) ω, resulting in a rotational difference between the first engaged member 110 and the engaging member 130. The combined member 130 is disengaged from the first engaged member 110. In this case, the circulating torque (deceleration torque) is transmitted from the first speed side to the second speed side due to the rotation difference between the first engaged member 110 and the engaging member 130.

  In this high speed mode, as shown in FIG. 9, the first connecting piece 131 of the engaging member 130 is rotated by the rotating shaft 132 by the circulating torque generated during the relative rotation of the first engaged member 110 and the engaging member 130. It is played in the direction of the arrow in the figure centering on. Specifically, the concave inclined surface 111a of the first engaged member 110 is changed by the relative rotation difference between the first engaged member 110 and the engaging member 130 corresponding to the first connecting piece 131 at the connecting position. The convex inclined surface 131c of the one connecting piece 131 is pressed. At this time, since the convex portion 138 of the movable member 137 has moved to the second connecting piece 134 side, the first connecting piece 131 is not prevented from rotating toward the connection release position by the convex portion 138, and the rotating shaft 132 is prevented. Is rotated in the direction of the arrow in the figure, and the engagement of the first engaged member 110 with the engaged recess 111 is released. Further, the first connection piece 131 smoothly returns to the connection release position according to the elastic biasing force of the spring 133 in the direction of the arrow in the figure. As a result, the rotation of the input shaft A2 is transmitted to the output shaft A3 only through the second idler gear G2o, thereby forming a power transmission system having a second speed reduction ratio.

  In this case, the acceleration torque of the engine E / G generated during normal traveling of the vehicle (that is, the acceleration torque of the idle gear G2o) is transmitted to the engagement member 130 via the torque transmission path T3. In this torque transmission path T3, the acceleration torque is transmitted to the second connecting piece 134 via the convex horizontal surface 134b pressed by the engaged concave portion 111 of the second engaged member 110, and further this second connecting piece 134. Is transmitted to the engaging member 130 through the convex portion 138 of the movable member 137. Thus, the change from the first speed to the second speed can be performed instantaneously, thereby achieving a seamless shift without interruption of the driving torque. This high speed mode corresponds to the “high speed mode” of the present invention.

  Although not specifically shown, regarding the change of the gear position from the second speed to the first speed (deceleration shift), the control modes shown in FIGS. A seamless shift similar to a change in gear position from 2 to 2 (acceleration shift) is achieved. In this case, due to the relative rotation difference between the second engaged member 120 and the engaging member 130 corresponding to the second connecting piece 134 in the connecting position, the concave inclined surface 121a of the second engaged member 120 is second connected. The convex inclined surface 134c of the piece 134 is pressed. At this time, since the convex portion 138 of the movable member 137 has moved to the first connecting piece 131 side, the second connecting piece 134 does not prevent the rotational movement toward the connection release position from being performed by the convex portion 138. And the engagement of the second engaged member 120 with the engaged recess 121 is released. Further, the second connection piece 134 smoothly returns to the connection release position according to the elastic biasing force of the spring 136 in the direction of the arrow in the drawing. As a result, the rotation of the input shaft A2 is transmitted to the output shaft A3 only through the first idle gear G1o, and a power transmission system having a first speed reduction ratio is formed.

According to the power transmission mechanism 101 having the above-described configuration, the engaging member 130 is also used as an object to be engaged with both the first engaged member 110 and the second engaged member 120, thereby achieving a seamless shift. Therefore, it is possible to reduce the number of component parts. In particular, by using the first connecting piece 131 and the second connecting piece 134 provided on the engaging member 130, the first engaged member 110 and the second engaged member are newly added to achieve a seamless shift. There is no need to provide the member 120, and the structure can be further simplified. As a result, it is possible to reduce assembly man-hours, weight, cost, etc. related to the transmission T / M.
In addition, a seamless shift can be achieved using a structure in which the first connecting piece 131 and the second connecting piece 134 provided on the engaging member 130 rotate.
In addition, since one fork shaft 150 and the movable member 137 also serve as means for driving both the first connecting piece 131 and the second connecting piece 134, the structure can be further simplified.
Further, by providing a neutral position as the setting position of the movable member 137, for example, after the movable member 137 is set to the first setting position at the time of the first speed shift, or the movable member 137 is set to the second setting position at the time of the second speed shift. Later, once the neutral position is set, shifting from the first speed or the second speed to another gear position can be performed without any problem.
Further, the first connection piece 131 or the second connection piece 134 is moved from the connection position to the connection release position by utilizing the relative rotation operation of the first engagement member 110 or the second engagement member 120 and the engagement member 130. Can be easily moved to. In this case, each of the first connection piece 131 and the second connection piece 134 can be reliably moved from the connection position to the connection release position by using the elastic biasing force of the springs 133 and 136, thereby facilitating seamless shift. Can be planned.

  The present invention is not limited to the above exemplary embodiment, and various applications and modifications are possible. For example, each of the following embodiments to which the above embodiment is applied can be implemented.

  In the above embodiment, the case where the first connection piece 131 and the second connection piece 134 rotate between the connection position and the connection release position has been described. However, in the present invention, the connection position and connection of each of these connection pieces are described. The movement form between the release positions is not limited to rotation, and various changes can be made as necessary. For example, each connection piece may be moved between a connection position and a connection release position by a sliding operation (linear operation) in one or more directions. Furthermore, the slide operation can be combined with the rotation operation.

  In the above embodiment, the case where both the first connecting piece 131 and the second connecting piece 134 are driven by using one fork shaft 150 and the movable member 137 has been described. A configuration in which the second connecting piece 134 is driven by a dedicated fork shaft and a movable member can also be employed.

  In the above-described embodiment, each of the first connecting piece 131 and the second connecting piece 134 uses the relative rotation difference between the corresponding engaged member and the engaging member 130 to the connection release position that is out of the connection position. However, in the present invention, it is also possible to adopt a structure in which each connecting piece is moved from the connection position to the connection release position by a dedicated driving means.

  In the above-described embodiment, the case where the springs 133 and 136 are used as the elastic members that elastically bias each of the first connection piece 131 and the second connection piece 134 from the connection position toward the connection release position has been described. In addition to the spring, an elastic material such as a rubber material can be used. In addition, this elastic member can also be abbreviate | omitted as needed.

  In the above embodiment, the case where the power transmission mechanisms 101, 102, and 103 are provided on the output shaft A3 has been described. However, in the present invention, the mechanisms corresponding to the power transmission mechanisms 101, 102, and 103 are referred to as the input shaft A2 and the output shaft, respectively. It can be provided on at least one of A3. That is, the power transmission mechanism of the present invention can be applied to a shaft provided with a predetermined idle gear.

  In the above-described embodiment, the power transmission mechanism in which the speed is changed between the first speed and the second speed has been described. However, in the present invention, a relatively low speed gear and a relatively high speed gear are appropriately set. Can be combined. For example, the present invention can be applied to a power transmission mechanism that performs a shift between the first speed and the third speed and a power transmission mechanism that performs a shift between the second speed and the fourth speed.

  T / M ... Transmission, C / D ... Clutch, D / F ... Differential, D / W ... Drive wheel, E / G ... Engine, F / W ... Flywheel, A1 ... Drive output shaft, A2 ... Input shaft, A3 ... output shaft, ACT1 ... clutch actuator, ACT2 ... transmission actuator, AP ... accelerator pedal, BP ... brake pedal, SL ... shift lever, ECU ... electronic control unit, G1i, G2i, G3i, G4i, G5i ... fixed gear, G1o, G2o, G3o, G4o, G5o ... idle gear, S1 ... accelerator opening sensor, S2 ... shift position sensor, S3 ... brake sensor, 101, 102, 103 ... power transmission mechanism, 110 ... first engaged member , 111 ... engaged recess, 120 ... second engaged member, 121 ... engaged recess, 130 ... engaging member, 131 ... first connecting piece, 131a Engaging convex portion, 131b ... convex horizontal surface, 131c ... convex inclined surface, 132 ... rotating shaft, 133 ... spring, 134 ... second connecting piece, 134a ... engaging convex portion, 134b ... convex horizontal surface, 134c ... convex Part inclined surface, 135 ... rotating shaft, 136 ... spring, 137 ... movable member, 138 ... convex part, 139 ... concave part, 140 ... snap ring, 150 ... fork shaft, 200 ... control device

Claims (5)

A vehicle transmission having a plurality of shift stages interposed in a power transmission system connecting a drive output shaft of a vehicle drive source and a drive wheel of the vehicle,
An input shaft that forms a power transmission system with the drive output shaft;
An output shaft with which a power transmission system is formed with the drive wheels;
A plurality of fixed gears that are coaxial with the input shaft or the output shaft and are not relatively rotatable, and a plurality of fixed gears corresponding to the plurality of shift stages,
A plurality of idler gears that are coaxially and relatively rotatable with the input shaft or the output shaft, respectively, and that respectively correspond to each of the plurality of gears and always mesh with the fixed gears of the corresponding gears. When,
With
The plurality of idle gears are:
Of the plurality of shift speeds, the first idler gear that is always meshed with the fixed gear of the low speed shift speed and the fixed gear of the high speed shift speed are always set for the low speed shift speed and the high speed shift speed. A second idler gear that meshes,
The vehicle transmission further includes:
Of the input shaft and the output shaft, coaxial between the first idle gear and the second idle gear of the shaft on which both the first idle gear and the second idle gear are provided. And an engaging member provided so as not to be relatively rotatable,
A first engaged member provided in a portion of the first idler gear facing the engagement member so as to be relatively rotatable with the first idler gear with respect to the shaft;
A second engaged member provided in a portion of the second idler gear facing the engagement member so as to be relatively rotatable with the second idler gear with respect to the shaft;
A first connection piece movably provided at a connection position for connecting the engagement member and the first engaged member to the engagement member, and a connection release position deviating from the connection position;
A second connecting piece movably provided at a connecting position for connecting the engaging member and the second engaged member to the engaging member, and a connection releasing position deviating from the connecting position;
A driving device for driving each of the first connecting piece and the second connecting piece;
With
The drive device
A low-speed mode in which the first connection piece is located at the connection position of the connection piece, and the second connection piece is located at the connection release position of the connection piece;
A high-speed mode in which the first connection piece is located at the connection release position of the connection piece, and the second connection piece is located at the connection position of the connection piece;
Any one of the intermediate mode in which both the first connecting piece and the second connecting piece are located at the connecting position of the connecting piece is selectively between the low speed mode and the high speed mode. Achieving a vehicle transmission. The vehicle transmission according to claim 1,
The engaging member is configured in a disc shape,
Each of the first connection piece and the second connection piece can be rotationally moved between the connection position and the connection release position of the connection piece around a rotation shaft provided on the outer peripheral surface of the engagement member. , Vehicle transmission. The vehicle transmission according to claim 1 or 2,
The drive device includes a fork shaft driven by an actuator, and a movable member coupled to the fork shaft so as to be movable in the axial direction of the shaft,
The movable member is driven by the fork shaft from the neutral position between the first connection piece and the second connection piece, each at the connection release position, and from the connection position of the first connection piece. Select one of a first setting position for preventing return to the connection release position and a second setting position for preventing return of the second connection piece from the connection position to the connection release position. Vehicle transmission, which is set up automatically. The vehicle transmission according to any one of claims 1 to 3,
Each of the first engaged member and the second engaged member includes an engaged recessed portion provided at a portion facing the engaging member, and a recessed inclined surface constituting the engaged recessed portion. Prepared,
Each of the first connecting piece and the second connecting piece engages with the engaged recessed portion of the first engaged member or the second engaged member when the connecting piece moves to the connecting position of the connecting piece. An engaging convex portion, and a convex inclined surface constituting the engaging convex portion,
The driving device is configured such that the concave inclined surface of the engaged member is caused by a relative rotation difference between the engaged member and the engaging member corresponding to the first connecting piece or the second connecting piece in the connecting position. Presses the convex inclined surface of the connecting piece to move the connecting piece from the connected position to the disconnected position. The vehicle transmission according to claim 4,
The drive device includes a vehicular transmission that includes an elastic member that elastically biases each of the first connection piece and the second connection piece from the connection position of the connection piece toward the connection release position.

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