JP6529117B2 - Shift change device of automatic transmission - Google Patents

Description

  The present invention relates to a shift switching device of an automatic transmission that switches a shift range using an actuator.

  Generally, an automatic transmission mounted on a vehicle such as a car is configured to transmit the operation of the shift lever to a manual valve that switches the shift range via a cable or the like to switch the shift range.

  On the other hand, recently, when the driver operates the shift lever or shift switch to select the shift range, an electrical signal corresponding to the selected shift range is generated, and the actuator is driven based on the electrical signal. A shift by wire (SBW) type automatic transmission that controls a manual valve has been developed.

  For example, in Patent Document 1, a shift shaft (control rod) fixed so that a plate (detent plate) for reciprocating a manual valve to integrally move is coupled to an output shaft of an electric motor of an actuator, An SBW-type automatic transmission is disclosed which controls an electric motor to rotate at a rotational angle according to a designated shift range position of a shift lever selected by a vehicle occupant. The shift shaft is inserted into and supported by the mounting hole of the transmission case, and is spline-connected to the output side of the actuator outside the transmission case and rotationally driven.

  In such an SBW type automatic transmission, when the parking range is selected by the shift operation, an actuator attached to the automatic transmission is driven to rotate the shift shaft and the parking pole is engaged with the parking gear. Thus, a parking lock mechanism is provided to lock the rotation of the automatic transmission to a parking lock state (ie, a state in which the wheels do not rotate).

  However, in such a parking lock mechanism, when the actuator attached to the automatic transmission is removed, the shift shaft in the transmission is exposed, and the shift shaft is shifted in the axial direction, whereby the rotational position of the detent plate is obtained. It is possible to lower the rotational operation load by disengaging the spring that holds the spring elastically, and there is a possibility that the shift shaft may be turned to release the parking state.

  In order to cope with such a problem, Patent Document 2 discloses a technique for externally attaching an SBW motor to a transmission case using an antitheft fastener. This antitheft fastener includes a bolt screwed into the screw groove of the transmission case, a bottomed cylindrical bolt cover having an open end, and a cap member closing the open end of the bolt cover. The bolt is fastened to the transmission case with the bottom of the bolt cover at the bottom of the head of the bolt, and then the cap member is engaged with the bolt cover to prevent it from coming out of the bolt cover. The tool's head is not manipulated in the removal direction.

Unexamined-Japanese-Patent No. 2006-336710 JP, 2009-109003, A

  The fastening structure as disclosed in Patent Document 2 requires a special dedicated fastener, which causes not only an increase in cost and an increase in weight but also when the actuator is removed in the normal maintenance. The bolt cover must be gripped with a tool and the bolt must be rotated indirectly, which takes time and deteriorates the workability.

  In this case, for example, to oppose the release of the parking lock due to the axial movement of the shift shaft with the intention of theft without making it difficult to remove the actuator, for example, perpendicular to the mounting hole of the shift shaft in the shift case. It is conceivable to provide a boss and attach a bolt for restricting the axial movement of the shift shaft to the boss.

  However, if such a boss is added around the mounting hole of the shift shaft of the transmission case, it not only causes an increase in weight but also causes the actuator to project more with respect to the transmission case, and the actuator and the other The clearance with the external parts becomes small, resulting in the limitation on the dressing.

  The present invention has been made in view of the above circumstances, and is a shift of an automatic transmission capable of preventing the release of a parking lock intended for theft without increasing the cost and the weight and ensuring maintenance. The purpose is to provide a switching device.

A shift switching device of an automatic transmission according to one aspect of the present invention rotationally drives a manual plate connected to a manual valve for switching a shift range of the automatic transmission, a shift shaft supporting the manual plate, and the shift shaft. A shift switching device of an automatic transmission including an actuator, wherein the shift shaft is provided with a projecting portion projecting in a radial direction, and the inner peripheral surface of a mounting hole of a transmission case through which the shift shaft is inserted is A groove for accommodating the projection is provided, and the groove is formed by a longitudinal groove which allows axial movement of the shift shaft, and a lateral groove which intersects the end of the longitudinal groove to make the shift shaft rotatable. It is formed.

  According to the present invention, it is possible to prevent the release of the parking lock with the intention of theft and to maintain the maintainability without causing the cost increase and the weight increase.

An explanatory view showing a shift switching device of an automatic transmission Partial cross section around shift shaft mounting part Perspective view of shift shaft Explanatory drawing which shows the groove part of a transmission case Explanatory drawing which shows a shift range position and the position of the projection part in a groove part

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  In FIG. 1, reference numeral 1 denotes an automatic transmission connected to an engine of a vehicle such as an automobile, and is a shift-by-wire (SBW) automatic transmission that switches a shift range by an electrical signal according to a driver's shift operation. . The SBW automatic transmission 1 includes a shift switching device 10 that switches the shift range based on a range position signal generated by a driver's shift operation.

  The shift switching device 10 includes an actuator 20 attached to the outer wall of the transmission case 2, a manual plate (detent plate) 30 rotationally driven by the actuator 20, a manual valve 40 connected to the manual plate 30, and a parking lock mechanism The unit 50 is mainly configured. The actuator 20 is an electric motor or the like equipped with a reduction gear, and corresponds to, for example, a P range, an R range, an N range, and a D range shift range by a control device (not shown) mainly composed of a microcomputer. Drive control is performed to the rotation angle.

  An actuator switch 21 for detecting the range position from the rotation angle of the actuator 20 is connected to the actuator 20.

  The manual plate 30 is a substantially fan-shaped member having a plurality of recessed portions formed in an arc-shaped outer peripheral portion, and a boss to which the shift shaft 35 connected to the output shaft of the actuator 20 is inserted and fixed on the fan-shaped base side. The part 30a is protruded. A roller 37 attached to the front end side of the detent spring 36 is engaged with the recess of the outer peripheral portion of the manual plate 30. The detent spring 36 is a leaf spring fixed to the inner wall side of the transmission case 2 in a cantilever manner, and the elastic force of the leaf spring causes the roller 37 to engage with one of the recesses of the manual plate 30.

  The other end of the shift connecting rod 42, one end of which is connected to the spool 41 of the manual valve 40, is fixed to the manual plate 30. When the manual plate 30 rotates and swings about the shift shaft 35, the spool 41 of the manual valve 40 reciprocates according to the rotational position of the manual plate 30 via the shift connecting rod 42.

  The manual valve 40 is a well-known range switching valve for selectively establishing the oil passage of the automatic transmission 1 in accordance with the movement of the spool 41 to switch the traveling range. The plurality of recesses in the outer peripheral portion of the manual plate 30 are arranged corresponding to the set position of each shift range in the manual valve 40, and when the manual plate 30 is rotated by the actuator 20, the roller 37 is shifted by a predetermined shift range. An operating position of the manual valve 40 is determined which engages with the position recess and the shift range position corresponding to the recess.

  Further, a parking lock mechanism 50 that mechanically fixes the rotation of the parking gear 51 splined to the output shaft 1 a of the automatic transmission 1 is connected to the manual plate 30. The parking lock mechanism unit 50 is provided rotatably at a meshing position for meshing with the parking gear 51, and has a parking pole 52 having a claw portion 52a selectively meshed with the parking gear 51; A cam 53 and a parking rod 54 having one end fixed to the manual plate 30 and the other end inserted through the parking cam 53 to support the parking cam 53 are mainly configured.

  The parking pole 52 is biased by the spring 55 in such a direction that the claws 52a move away from the parking gear 51. When the manual plate 30 swings, the parking rod 54 reciprocates, and the parking cam 53 vertically moves the parking pole 52. Move. The vertical movement of the parking pole 52 causes the claws 52 a of the parking pole 52 to mesh with or separate from the parking gear 51. When the claw portion 52a meshes with the parking gear 51, the rotation of the parking gear 51 is fixed (parked locked) to the transmission case 2, and when the claw portion 52a separates from the parking gear 51, the parking lock is released.

  In the shift switching device 10 having the above configuration, the connection structure between the actuator 20 attached to the outside of the transmission case 2 and the manual plate 30 via the shift shaft 35 is a connection structure as shown in FIG.

  That is, as shown in FIGS. 2 and 3, the shift shaft 35 connecting the actuator 20 and the manual plate 30 is inserted into the mounting hole of the boss 30a of the manual plate 30 inside the transmission case 2 and the pin end is inserted. The shaft end side of the transmission case 2 outside is fixed to the output shaft 20a of the actuator 20 so as to be axially slidable via a spline 35a. At this time, the shift shaft 35 is inserted in a state of being positioned in the mounting hole 3a of the boss 3 provided on the inner wall surface of the transmission case 2, and the manual plate 30 is supported inside the transmission case 2 The actuator 20 is connected outside the case 2.

  For this reason, the shift shaft 35 is provided with a positioning projection 35 b that protrudes from the outer peripheral surface. The protrusion 35b is formed in the same manner as the parallel key for shaft locking, and is accommodated in a groove 4 formed in the inner peripheral surface of the mounting hole 3a of the boss 3 on the transmission case 2 side. As shown in FIG. 4, the groove 4 is a T-shaped groove having a longitudinal groove 4a of a predetermined length in the axial direction and a circumferential lateral groove 4b intersecting at the end of the longitudinal groove 4a. It is formed.

  The longitudinal groove portion 4a has a rotational direction position when the shift shaft 35 is assembled to the transmission case 2 via the projection portion 35b so that the range position by the manual valve 40 connected via the manual plate 30 is in the neutral state. Regulate. Further, the lateral groove portion 4b enables rotation of the shift shaft 35 by the actuator 20 in a state where the axial position of the shift shaft 35 is positioned with respect to the shift shaft 35 assembled to the transmission case 2 in the neutral state. Is a ditch.

  That is, the shift shaft 35 can be easily held in the neutral state and assembled simply by aligning the protrusion 35b on the shift shaft 35 side with the longitudinal groove 4a on the transmission case 2 side, and after assembly, the lateral groove 4b Thus, the shift shaft 35 can rotate to a range position other than the neutral range. For example, as shown in FIG. 5, with the position of the neutral (N) range by the vertical groove 4a as the center, both end positions of the horizontal groove 4b correspond to the parking (P) range and the drive (D) range. The position between the range corresponds to the reverse (R) range.

  As described above, in the present embodiment, the actuator 20 is connected to the manual plate 30 by the projection 35 b of the shift shaft 35 and the T-shaped groove 4 of the transmission case 2. Even if the manual shaft 35 is exposed by removing it from the transmission case 2, it is difficult to shift the shift shaft 35 in the axial direction to reduce the load on the manual plate 30 by the detent spring 36. This makes it difficult to release the parking lock while maintaining the maintainability, and the vehicle antitheft can be effectively prevented.

  In addition, by adopting such a connection structure, it is not necessary to provide a bolt for restricting the axial position of the shift shaft 35 or a boss on which the bolt is mounted, on the transmission case 2 side, so the cost increases. Not only can the weight increase be suppressed, but also the positioning of the shift shaft 35 to which the manual plate 30 inside the transmission case 2 is fixed can be facilitated, and the assembling workability can be improved. Furthermore, the wall surface position of the transmission case 2 on the side of the actuator 20 can be moved inward, and the clearance between the automatic transmission 1 and components outside the automatic transmission 1 can be secured.

1 Automatic Transmission 2 Transmission Case 3 Boss 3a Mounting Hole 4 Groove 4a Vertical Groove 4b Horizontal Groove 10 Shift Shifter 20 Actuator 30 Manual Plate 35 Shift Shaft 35a Spline 35b Protrusive 40 Manual Valve 50 Parking Lock Mechanism

Claims (2)

A shift switching device for an automatic transmission, comprising: a manual plate connected to a manual valve switching a shift range of the automatic transmission; a shift shaft supporting the manual plate; and an actuator rotatably driving the shift shaft ,
While providing the projection part which protrudes in radial direction in the said shift shaft, the groove part which accommodates the said projection part is provided in the internal peripheral surface of the attachment hole of the transmission case by which the said shift shaft is penetrated,
An automatic transmission characterized in that the groove portion is formed by a longitudinal groove portion which enables axial movement of the shift shaft, and a lateral groove portion which intersects the end of the longitudinal groove portion to make the shift shaft rotatable. Machine shift switching device.   The vertical groove is a position corresponding to the neutral range of the shift range, and a position corresponding to a parking range and a position corresponding to a drive range are disposed on both sides of a position intersecting the vertical groove of the horizontal groove. The shift switching device for an automatic transmission according to claim 1, characterized in that:

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