JP2013204757A - Vehicle transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of components in a vehicle transmission that includes 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 vehicle transmission includes an engaged member 130 provided between a first idling gear G1o and a second idling gear G2o so as to be incapable of relative rotation and axial movement, a first engaging member 110 provided between the first idling gear G1o and the engaged member 130 so as to be movable between an engagement position of engaging with the engaged member 130 and a disengagement position of disengaging the engagement, a second engaging member 120 provided between the second idling gear G2o and the engaged member 130 so as to be movable between an engagement position of engaging with the engaged member 130 and a disengagement position of disengaging the engagement, and a driving device for axially driving each of the first engaging member 110 and the second engaging member 120. Owing to this configuration, it is possible to selectively establish any mode of a low-speed mode, a high-speed mode, and an intermediate mode.

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 (acceleration shift) 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. Can do.

Special table 2010-510464 gazette

By the way, in the transmission as described in the above-mentioned Patent Document 1, there is a request to reduce the number of parts of the elements for achieving the above-described seamless shift, thereby reducing the assembly man-hour, weight, cost, etc. relating to the transmission. There is.
In addition, regarding the change between the low speed side gear stage and the high speed side gear stage, instead of using the actuator, each of the engaging members is inclined with respect to the axial direction at a portion facing the engaged member. The structure which provides the inclined surface extended so that can be employ | adopted. According to this structure, for example, the first engaged member in which the inclined surface of one engaging member rotates together with the low-speed gear in the acceleration shift process of changing from the low-speed gear to the high-speed gear. By being in contact with each other, an extrusion load is received so as to be separated from the first engaged member in the axial direction. Thereby, it becomes possible to release the engagement between one engaging member and the first engaged member by utilizing a part of the rotational force of the first engaged portion.
However, when the inclined surface as described above is used for releasing the engagement between the one engaging member and the first engaged member, it is necessary to give the inclined surface high strength, and as a result, the transmission The weight and cost will increase. Further, for example, in the deceleration shift process of changing from the high speed side gear stage to the low speed side gear stage, since the inclined surface of one engaging member receives a pushback load that separates from the first engaged member, Seamless shift during shifting is hindered.

  Accordingly, the present invention has been made in view of the above points, and reduces the number of parts in 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. And an input shaft, an output shaft, a plurality of fixed gears, a plurality of idle gears, an engaged member, a first engaging member, a second engaging member, and a driving device.

  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 engaged member is 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 of the input shaft and the output shaft are provided. Further, it is provided so as not to be relatively rotatable and to be immovable in the axial direction of the shaft. That is, when the first idle gear and the second idle gear are provided only on the input shaft, the engaged member is provided only on the input shaft, and the first idle gear and the second idle gear are provided only on the output shaft. When the gear is provided, the engaged member is provided only on the output shaft, and when the first idle gear and the second idle gear are provided on both the input shaft and the output shaft, the input shaft and Engaged members can be provided on both of the output shafts. The first engagement member is disengaged from the engagement position between the first idle gear and the engaged member, which is coaxial with the shaft and engages with the engaged member in the axial direction. It is provided so as to be movable between the disengagement position and to rotate with the first idle gear. The second engagement member is disengaged from the engagement position between the second idler gear and the engaged member, which is coaxial with the shaft and engages with the engaged member in the axial direction. It is provided so as to be movable between the disengagement position and to rotate together with the second idler gear. Typically, each of the first engaging member and the second engaging member is engaged with the engaged member when one or more sets of engaging claws or engaging teeth mesh with each other. Further, even if the first engagement member constitutes a new first idler gear together with the first idler gear, and the second engagement member constitutes a new second idler gear together with the second idler gear. Good. That is, the engaging member can be a component of the idle gear.

  The drive device is a device for driving each of the first engagement member and the second engagement member in the axial direction, and selectively achieves one of a low speed mode, a high speed mode, and an intermediate mode. To do. In the low speed mode, the first engagement member is located at the engagement position of the first engagement member, and the second engagement member is located at the engagement release position of the second engagement member. In the high speed mode, the first engagement member is located at the engagement release position of the first engagement member, and the second engagement member is located at the engagement position of the second engagement member. In the intermediate mode, both the first engagement member and the second engagement member are positioned at the engagement position of the engagement member between the low speed mode and the high speed mode. That is, in this intermediate mode, a double engagement state is formed in which both the first engagement member and the second engagement member are engaged with the engaged members, respectively. 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 engaged member is also used as an engagement target of both the first engagement member and the second engagement member, it is possible to reduce the number of parts of elements for achieving a seamless shift. . As a result, it is possible to reduce assembly man-hours, weight, cost, and the like related to the vehicle transmission. Further, since the driving device is used for releasing the engagement between each of the first engaging member and the second engaging member and the engaged member, for example, a high-strength inclined surface as described above is provided on the engaged member. There is no need to provide it. As a result, an increase in the weight and cost of the transmission can be suppressed, and a seamless shift during a deceleration shift can be performed smoothly.

  In a further aspect of the vehicle transmission according to the present invention, the drive device preferably includes a first elastic member, a second elastic member, a first urging member, and a second urging member. The first elastic member always applies a resilient force toward the engagement release position from the engagement position of the first engagement member to the first engagement member. The second elastic member constantly applies a resilient force from the engagement position of the second engagement member to the engagement release position with respect to the second engagement member. In this case, the first elastic member and the second elastic member may be configured as one elastic member, or each may be configured as a separate elastic member. The first biasing member resists the elastic force of the first elastic member in order to drive the first engagement member from the disengagement position of the first engagement member to the engagement position. The first engagement member is driven from the engagement position of the first engagement member to the disengagement position according to the elastic force of the first elastic member. Release the bias. The second urging member resists the elastic force of the second elastic member in order to drive the second engagement member from the disengagement position of the second engagement member to the engagement position. The second engagement member is driven from the engagement position of the second engagement member to the disengagement position according to the elastic force of the second elastic member. Release the bias. In this case, the first urging member and the second urging member may be configured as one member, or each may be configured as a separate member. Thereby, the structure which moves a 1st engagement member and a 2nd engagement member to the engagement releasing position of the said engagement member, respectively can be simplified using an elastic member.

  In the further embodiment of the vehicle transmission according to the present invention, the engaged member is directed to the first engaging member or the second engaging member on each of the disc-shaped main body and both surfaces of the main body. It is preferable to include a plurality of engaged claws that protrude and are arranged at equal intervals in the circumferential direction of the main body portion. Each of the first engagement member and the second engagement member is directed toward the plurality of engaged claws on one side of the main body portion for engagement with the disk-shaped main body portion and the engaged member. It is preferable to include a plurality of engaging claws that protrude and are arranged at equal intervals in the circumferential direction of the main body portion corresponding to the plurality of engaged claws. Thereby, the structure in which each of the first engaging member and the second engaging member and the engaged member are engaged can be simplified by using one set or a plurality of sets of nail members that mesh with each other.

  As described above, according to the present invention, it is possible to reduce the number of parts in a vehicle transmission including a mechanism that performs a seamless shift between a low speed gear and a high speed gear. .

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 perspective view of an engaged member 130 in FIG. 2. FIG. 3 is a perspective view of a first engagement member 110 in FIG. 2. FIG. 3 is a perspective view of a second engagement member 120 in FIG. 2. It is a figure which shows the engagement state of the engaging members 110 and 120 and the to-be-engaged member 130 in case the gear stage of transmission T / M is 1st speed. It is a figure which shows the engagement state of the engaging members 110 and 120 and the to-be-engaged member 130 in the process in which the gear stage of transmission T / M is changed from 1st speed to 2nd speed. It is a figure which shows the engagement state of the engaging members 110 and 120 and the to-be-engaged member 130 in the process in which the gear stage of transmission T / M is changed from 1st speed to 2nd speed. It is a figure which shows the engagement state of the engaging members 110 and 120 and the to-be-engaged member 130 in case the gear stage of transmission T / M is 2nd speed.

  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.

  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 have the same structure, only the structure of the power transmission mechanism 101 will be described here with reference to FIGS.

  The power transmission mechanism 101 shown in FIG. 2 corresponds to the first speed, which is a relatively low speed among a plurality of speed stages, and the second speed, which is a higher speed speed than the first speed. Including a first idle gear G1o, a second idle gear G2o, a first engagement member 110, a second engagement member 120, and an engaged member 130, which are provided on the output shaft A3 of the machine T / M. .

  Both the idle gears G1o and G2o are prevented from moving in the axial direction X of the output shaft A3 by the snap ring 140 (fixing means), and can be rotated relative to the output shaft A3 in the axial direction Y. ing. The engaged member 130 is provided coaxially with the output shaft A3 and non-rotatably by spline fitting between the first idle gear G1o and the second idle gear G2o, and is similar to the snap ring 140 described above. The fixing means (not shown) cannot be moved in the axial direction X of the output shaft A3. Therefore, the engaged member 130 always rotates together with the output shaft A3 when rotating in the direction Y around the axis of the output shaft A3. Further, the engaged member 130 includes a plurality of engaged claws 132 that protrude toward the first engaging member 110 and the second engaging member 120 on both surfaces of the disc-shaped main body 131. It has. This engaged member 130 corresponds to the “engaged member” of the present invention.

  The first engagement member 110 is provided between the first idle gear G1o and the engaged member 130 so as to be coaxial with and relative to the output shaft A3, and to be engaged with respect to the axial direction X of the output shaft A3. It is movable between an engagement position where it engages with the member 130 and an engagement release position where the engagement is released (the position shown in FIG. 2), and rotates in the axial direction Y together with the first idle gear G1o. Thus, the first idle gear G1o is always engaged by spline fitting. In addition, between the first engagement member 110 and the engaged member 130, the elastic force toward the engagement release position from the engagement position of the first engagement member 110 with respect to the first engagement member 110. A coil spring 114 for biasing the force at all times is interposed. The coil spring 114 corresponds to the “first elastic member” of the present invention.

  On the other hand, the first engagement member 110 is connected to the fork shaft 151 via the fork 150. The fork 150 and the fork shaft 151 are driven in the axial direction X of the output shaft A3 by the actuator ACT2 controlled by the electronic control unit ECU described above. That is, the fork 150 and the fork shaft 151 are moved so that the first engagement member 110 moves from the disengagement position with the engaged member 130 to the engagement position against the elastic force of the coil spring 114. The first engaging member 110 is biased. Further, the fork 150 and the fork shaft 151 are arranged so that the first engagement member 110 moves from the engagement position with the engaged member 130 to the disengagement position according to the elastic force of the coil spring 114. The urging | biasing with respect to the engaging member 110 is cancelled | released. The fork 150 and the fork shaft 151 here constitute the “first biasing member” of the present invention.

  In short, the first engagement member 110 moves in the axial direction X of the output shaft A3 by the cooperation of the coil spring 114 and the actuator ACT2 (fork 150 and fork shaft 151) that constitute the driving device, and moves in the axial direction X. The position can be changed. For example, in the state where the biasing force by the actuator ACT2 is released, the first engagement member 110 is engaged with the engaged member 130 so that the coil length of the coil spring 114 becomes L1 only by the elastic force of the coil spring 114. Is set to the disengagement position (also referred to as “initial position”). On the other hand, the first engagement member 110 is controlled to approach the engaged member 130 by the urging force of the actuator ACT2 that exceeds the elastic force of the coil spring 114, and is set to the engagement position.

  Further, the first engaging member 110 includes a plurality of engaging claws 112 that protrude toward the plurality of engaged claws 132 of the engaged member 130 on one surface of the disc-shaped main body 111. . The first engagement member 110 having a plurality of engagement claws 112 may be a constituent element of the first idle gear G1o. The first engagement member 110 corresponds to the “first engagement member” of the present invention.

  Similarly, the second engagement member 120 is provided to be rotatable relative to the output shaft A3 between the second idle gear G2o and the engaged member 130, and is engaged with respect to the axial direction X of the output shaft A3. It is movable between an engagement position where it engages with the member 130 and an engagement release position where the engagement is released (the position shown in FIG. 2), and rotates in the axial direction Y together with the second idle gear G2o. Thus, the second idle gear G1o is always engaged by spline fitting. In addition, between the second engagement member 120 and the engaged member 130, the elastic force toward the engagement release position from the engagement position of the second engagement member 120 with respect to the second engagement member 120 is provided. A coil spring 114 similar to the above-described coil spring 114 that applies force at all times is interposed. The coil spring 124 corresponds to the “second elastic member” of the present invention.

  On the other hand, the second engagement member 120 is connected to the fork shaft 161 via the fork 160. The fork 160 and the fork shaft 161 are driven in the axial direction X of the output shaft A3 by the actuator ACT2 controlled by the electronic control unit ECU described above. That is, the fork 160 and the fork shaft 161 are moved so that the second engagement member 120 moves from the disengagement position with the engaged member 130 to the engagement position against the elastic force of the coil spring 114. The two engaging members 120 are urged. Further, the fork 160 and the fork shaft 161 are arranged so that the second engagement member 120 moves from the engagement position with the engaged member 130 to the engagement release position according to the elastic force of the coil spring 114. The urging | biasing with respect to the engaging member 120 is cancelled | released. The fork 160 and the fork shaft 161 here constitute a “second urging member” of the present invention.

  In short, the second engaging member 120 moves in the axial direction X of the output shaft A3 by the cooperation of the coil spring 124 and the actuator ACT2 (fork 160 and fork shaft 161) that constitute the driving device, and moves in the axial direction X. The position can be changed. For example, in the state where the urging force by the actuator ACT2 is released, the second engagement member 120 is such that the coil length of the coil spring 124 becomes L1 only by the elastic force of the coil spring 124. Is set to the disengagement position (also referred to as “initial position”). On the other hand, the second engagement member 120 is controlled to approach the engaged member 130 by the urging force of the actuator ACT2 that exceeds the elastic force of the coil spring 124, and is set to the engagement position.

  Further, the second engaging member 120 includes a plurality of engaging claws 122 that protrude toward the plurality of engaged claws 132 of the engaged member 130 on one surface of the disk-shaped main body 121. . The first engagement member 110 having a plurality of engagement claws 122 may be a constituent element of the second idle gear G2o. The second engagement member 110 corresponds to the “second engagement member” of the present invention.

  FIG. 3 is referred to for the specific structure of the engaged member 130 described above. In the engaged member 130 shown in FIG. 3, it protrudes toward the first engagement member 110 or the second engagement member 120 on each of both surfaces of the main body 131, and 4 at equal intervals in the circumferential direction of the main body 131. Two engaged claws 132 (a total of eight engaged claws 132) are arranged. Each engaged claw 132 is configured as a quadrangular prism having two inclined surfaces 132a whose cross-sectional shape becomes narrower toward the output shaft A3. The engaged claw 132 here corresponds to the “engaged claw” of the present invention.

  4 and 5 are referred to for the specific structures of the first engaging member 110 and the second engaging member 120, respectively.

  The first engaging member 110 shown in FIG. 4 has four pieces arranged at equal intervals in the circumferential direction on one surface of the main body 111 for engagement with the plurality of engaged claws 132 of the engaged member 130. An engaging claw 112 is provided. Each engaging claw 112 is substantially the same shape as the engaged claw 132 of the engaged member 130, and is configured as a quadrangular prism having two inclined surfaces 112a. That is, the engaged claw 132 has a uniform cross-sectional shape with respect to the axial direction of the output shaft A3. Further, the engaging claw 112 has the same radial distance from the output shaft A3 as that of the engaged claw 132 of the engaged member 130. Accordingly, the space 113 formed between the two engaging claws 112 adjacent to each other is configured as an insertion space into which each engaged claw 132 of the engaged member 130 can be inserted. In a state in which the engaged claw 132 of the engaged member 130 is inserted into the space 113 of the first engaging member 110, the engaged claw 132 and the engaging claw 112 are engaged, and specifically When the inclined surface 132a of the engaged claw 132 and the inclined surface 112a of the engaging claw 112 abut each other, the engaged member 130 and the first engaging member 110 are integrated in the direction Y around the output shaft A3. Can be rotated. The engaging claw 112 here corresponds to the “engaging claw” of the present invention.

  Similarly, the second engagement members 120 shown in FIG. 5 are arranged at equal intervals in the circumferential direction on one surface of the main body 121 for engagement with the plurality of engaged claws 132 of the engaged member 130. Four engaging claws 122 are provided. Each engaging claw 122 has substantially the same shape as the engaged claw 132 of the engaged member 130, and is configured as a quadrangular prism having two inclined surfaces 122a. Further, the engaging claw 122 has the same radial distance from the output shaft A3 as that of the engaged claw 132 of the engaged member 130. Accordingly, the space 123 formed between the two engaging claws 122 and 122 adjacent to each other is configured as an insertion space into which each engaged claw 132 of the engaged member 130 can be inserted. In a state where the engaged claw 132 of the engaged member 130 is inserted into the space 123 of the second engaging member 120, the engaged claw 132 and the engaging claw 122 are engaged with each other. When the inclined surface 132a of the engaged claw 132 and the inclined surface 122a of the engaging claw 122 come into contact with each other, the engaged member 130 and the second engaging member 120 are integrated in the direction Y around the output shaft A3. Can be rotated. The engagement claw 122 here corresponds to the “engagement claw” of the present invention.

  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 first speed to the second speed 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. In these drawings, only representative claws involved in engagement among the eight engaged claws 132, the four engagement claws 112, and the four engagement claws 122 are shown. It is assumed that the gear ratio between the first idle gear G1o and the second idle gear G2o is 1: 2.

(Low speed mode)
In the low speed mode shown in FIG. 6, the transmission T / M is set to the first speed. That is, the first engagement member 110 is controlled to the engagement position of the first engagement member, and the second engagement member 120 is controlled to the engagement release position of the second engagement member. Specifically, the first engaging member 110 has a transmission actuator ACT2 (fork) such that the engaging claw 112 engages with the engaged claw 132 of the engaged member 130 (also referred to as “mesh”). 150 and the fork shaft 151) are urged to the engagement position in FIG. In this case, the coil length of the coil spring 114 is set to a length L2 that is less than the initial length L1. That is, as a result of the first engagement member 110 being biased on the output shaft A3 in the direction approaching the engaged member 130 against the elastic force of the coil spring 114, the engagement position in FIG. Is set to On the other hand, the second engagement member 120 has the transmission actuator ACT2 (fork 160 and fork shaft 161) so that the engagement between the engagement claw 122 and the engaged claw 132 of the engaged member 130 is released. 2 is released, and is maintained at the disengagement position in FIG. 2 only by the elastic force of the coil spring 114.

  In this low speed mode, 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 engagement member 110 connected to the first idle gear G1o rotates in the same direction at the same rotational speed ω as the first idle gear G1o. Further, the engaged member 130 engaged with the first engaging member 110 also rotates in the same direction at the same rotational speed ω together with the output shaft A3. In this case, 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. This low speed mode corresponds to the “low speed mode” of the present invention.

(Intermediate mode)
The intermediate mode shown in FIG. 7 is a state where the transmission T / M is changed from the first speed to the second speed between the low speed mode of FIG. 6 and the high speed mode of FIG. Specifically, following the low speed mode of FIG. 6, the second engagement member 120 has the transmission actuator ACT <b> 2 such that the engagement claw 122 is engaged with the engaged claw 132 of the engaged member 130. The fork 160 and the fork shaft 161 are urged from the disengagement position in FIG. 2 to the engagement position in FIG. In this case, the coil length of the coil spring 124 is set to a length L2 that is less than the initial length L1. That is, as a result of the second engagement member 120 being driven in the direction approaching the engaged member 130 on the output shaft A3 against the elastic force of the coil spring 124, the second engagement member 120 is moved to the engagement position in FIG. Is set. On the other hand, the first engaging member 110 is maintained at the engaging position where the engaging claw 112 is engaged with the engaged claw 132 of the engaged member 130. Accordingly, in the intermediate mode shown in FIG. 7, a double engagement state (“double engagement state”) in which both the first engagement member 110 and the second engagement member 120 are temporarily engaged with the engaged member 130. Also called).

  In this intermediate mode, as a result of the second engagement member 120 engaging the engaged member 130, the rotational speed of the second engagement member 120 is halved from 2ω to ω. Further, the rotational speed of the second idle gear G2o connected to the second engagement 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 engaging member 110 is halved from ω to (½) ω. 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. This intermediate mode corresponds to the “intermediate mode” of the present invention.

  Further, as shown in FIG. 8, the rotation speed of the first engagement member 110 is decreased, and a rotation difference is generated between the first engagement member 110 and the engaged member 130. The first engagement member 110 and the engaged member 130 rotate relative to each other so that the engaged claw 112 and the engaged claw 132 are separated from each other (see the white arrow in FIG. 8). In this case, the rotation of the input shaft A2 is temporarily transmitted to the output shaft A3 only through the second idle gear G2o.

(High speed mode)
In the high speed mode shown in FIG. 9, the first engagement member 110 is controlled to the disengagement position of the first engagement member, and the second engagement member 120 is controlled to the engagement position of the second engagement member. Is done. Specifically, following the state shown in FIG. 8, the first engagement member 110 is released from the bias of the transmission actuator ACT2 (fork 150 and fork shaft 151), and only by the elastic force of the coil spring 114. As a result of being driven in a direction away from the engaged member 130 on the output shaft A3, the engagement shaft returns to the disengagement position in FIG. In this case, the coil length of the coil spring 114 is set to the initial length L1. Thereby, the engagement of the first engagement member 110 with the engaged member 130 is completely released. In this case, the rotation of the input shaft A2 is transmitted to the output shaft A3 only through the second idle gear G2o, and a power transmission system having a reduction gear ratio of 2nd speed is formed. Thus, the change from the first speed to the second speed (acceleration shift) 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.

  The driving of the first engagement member 110 in the high speed mode is preferably performed using only the elastic force when the coil spring 114 returns to the disengagement position in FIG. 2 as described above. Thereby, the power for releasing the engagement between the first engagement member 110 and the engaged member 130 is suppressed. On the other hand, both the coil spring 114 and the transmission actuator ACT2 can be used to release the engagement between the first engaging member 110 and the engaged member 130. Further, while the coil spring 114 is used to set the first engagement member 110 to the engagement position, the transmission actuator ACT2 can be used to set the first engagement member 110 to the engagement release position. . Also, a spring other than the coil spring or an elastic member other than the spring can be used.

  Although not specifically shown, regarding the change of the gear position from the second speed to the first speed (deceleration shift), the control mode from FIG. 6 to FIG. A seamless shift similar to the change of the gear position to the second speed (acceleration shift) is achieved.

According to the power transmission mechanism 101 having the above-described configuration, the engaged member 130 serves as both the first engagement member 110 and the second engagement member 120, and thus achieves a seamless shift. The number of parts of the element can be reduced. As a result, it is possible to reduce assembly man-hours, weight, cost, etc. related to the transmission T / M. In addition, since the coil springs 114 and 124 are used for releasing the engagement between each of the first engagement member 110 and the second engagement member 120 and the engaged member 130, for example, the engaged member 130 may be configured as described above. It is not necessary to provide a high-intensity inclined surface, that is, an inclined surface extending so as to be inclined with respect to the axial direction of the output shaft A3. As a result, an increase in the weight and cost of the transmission T / M can be suppressed, and a seamless shift during a deceleration shift can be performed smoothly.
Moreover, the structure which sets the 1st engaging member 110 and the 2nd engaging member 120 to the engagement releasing position of the said engaging member can be simplified using the coil springs 114 and 124, respectively.
Further, the structure in which each of the first engagement member 110 and the second engagement member 120 and the engaged member 130 are engaged with each other is a set or a plurality of sets of engaging claws (engaging claws and engaged claws). ) Can be used for simplification.

  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 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 embodiment, the transmission actuator ACT2 for driving the fork shafts 151 and 161 may be a single actuator, or may be constituted by two actuators provided independently on the fork shafts 151 and 161, respectively. May be. Further, the fork shafts 151 and 161 may be shared, and the two first engaging members 110 and the second engaging member 120 may be driven using one fork shaft. Further, each of the forks 150 and 160 and the fork shafts 151 and 161 can be configured as one member. Moreover, the coil springs 114 and 124 can be configured as one coil spring.

  In the above-described embodiment, the power transmission mechanism that shifts between the first speed and the second speed is described as an example, but the speed is changed between a relatively low speed gear and a relatively high speed gear. The present invention can be applied to a power transmission mechanism that performs the above.

  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 engaging member, 111, 121 ... main body, 112, 122 ... engaging claw, 112a, 122a ... slope, 113, 123 ... space, 114, 124 Coil spring, 120 ... second engaging member, 130 ... engaged member, 131 ... main body, 132 ... engaged claw, 132a ... slope, 140 ... snap ring, 150,160 ... fork, 151, 161 ... fork Shaft 200 ... Control device

Claims (3)

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 stage and the fixed gear of the high-speed shift stage are always connected to the low-speed shift stage and the high-speed shift stage. 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 engaged member provided so as to be relatively unrotatable and immovable in the axial direction of the shaft;
An engagement position that is coaxial with the shaft and engages with the engaged member between the first idle gear and the engaged member, and an engagement release position at which the engagement is released. A first engagement member that is movable between the first engagement gear and the first engagement gear.
Between the second idle gear and the engaged member, an engagement position that is coaxial with the shaft and engages with the engaged member in the axial direction, and an engagement release position that releases the engagement. A second engagement member that is movable between the second engagement gear and that rotates together with the second idler gear;
A driving device for driving each of the first engaging member and the second engaging member in the axial direction;
With
In the drive device, the first engagement member is located at the engagement position of the first engagement member, and the second engagement member is located at the engagement release position of the second engagement member. Slow mode,
A high speed mode in which the first engagement member is located at the disengagement position of the first engagement member, and the second engagement member is located at the engagement position of the second engagement member;
An intermediate mode in which both the first engagement member and the second engagement member are located at the engagement position of the engagement member between the low speed mode and the high speed mode. Vehicle transmission that selectively achieves mode. The vehicle transmission according to claim 1,
The driving device includes:
A first elastic member that constantly applies a resilient force from the engagement position of the first engagement member toward the engagement release position with respect to the first engagement member;
A second elastic member that constantly applies a resilient force from the engagement position of the second engagement member toward the engagement release position with respect to the second engagement member;
In order to drive the first engagement member from the disengagement position of the first engagement member to the engagement position, the first engagement member is resisted against the elastic force of the first elastic member. While urging toward the engaged member, the first engaging member is driven from the engaging position of the first engaging member to the disengaged position according to the elastic force of the first elastic member. A first biasing member that releases the biasing to
In order to drive the second engagement member from the disengagement position of the second engagement member to the engagement position, the second engagement member is opposed to the elastic force of the second elastic member. While urging toward the engaged member, the second engaging member is driven from the engaging position of the second engaging member to the disengaged position according to the elastic force of the second elastic member. A second urging member for releasing the urging force to
Including a vehicle transmission. The vehicle transmission according to claim 1 or 2,
The engaged member protrudes toward the first engaging member or the second engaging member on each of the disk-shaped main body and both surfaces of the main body, and in the circumferential direction of the main body. A plurality of engaged claws arranged at intervals,
The first engaging member and the second engaging member are respectively connected to the plurality of engaged claws on one surface of the main body portion for engagement with a disk-shaped main body portion and the engaged member. And a plurality of engaging claws that protrude toward each other and are arranged at equal intervals in the circumferential direction of the main body portion in correspondence with the plurality of engaged claws.

Images