JPH0579114U - Gearbox shift device - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a shift device of a transmission, which simplifies a stop mechanism of a shift side of a shift device that can shift only in one direction, and thereby improves reliability and assembly. The purpose is to improve. In a shift device of a transmission capable of shifting only in one direction from a neutral position, a snap ring having a circular cross section is fitted to a shift shaft, and a tapered surface is projected onto a shaft support portion with which the snap ring comes into contact. A pad is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a shift device for a transmission used in an automobile or the like, which shifts gears such as four forward gears and one reverse gear.

[0002]

[Prior Art]

 In the conventional shift device of this type of transmission, in the case of the above-described four forward gears and one reverse gear, it is necessary to operate the shift lever for gear shifting as shown in FIG. 4, and the operation of this shift lever is As shown in FIG. 3, the outer lever 3 transmitted to the spline shaft 2 in the remote control cover 1 and moved by the spline shaft 2 operates by the guide plate 6 attached to the transmission cover 4 with the nut 5. Be guided.

The outer lever 3 guided by the guide plate 6 has any one of two shift shafts 7 and 8 for forward movement and a groove 10a of each shifter 10 provided on one shift shaft 9 for backward movement. Engage the crab.

The shifter 10 in which the groove 10a is engaged with the outer lever 3 is moved back and forth according to the movement of the outer lever 3, and the shifter 10 is selected by the outer lever 3 and the meshing gear of the meshing gear is moved by the forward and backward movement of the outer lever 3. A predetermined gear ratio can be obtained by selection.

As described above, the movement of the outer lever 3 is attached to the transmission cover 4 and guided by the guide plate 6 that guides the movement of the outer lever 3. The movement of the shift lever shown in FIG. It is done.

A locking device that locks the operating positions of the shift shafts 7, 8 and 9 in the front-rear direction is described in Japanese Utility Model Laid-Open No. 64-48473.

[0007]

[Problems to be solved by the device]

 In such a transmission shift device, the guide plate 6 is necessary as a mechanism for preventing the shift shaft 9 that moves only in one direction, such as backward movement, from moving in the opposite direction. Therefore, it is necessary to tighten the guide plate 6 as a component and the nut 5 for attaching the guide plate 6 to the transmission cover 4.

Moreover, the guide plate 6 needs to be machined into a desired shape, which not only increases the cost, but also requires a mounting process, which reduces the overall cost. This led to high prices and problems with reliability.

The present invention solves the above-mentioned problems in the conventional transmission shift device, simplifies the pull-down shift stop mechanism of the shift device that can shift only in one direction, and improves reliability. The purpose is to improve the assemblability.

[0010]

[Means for Solving the Problems]

 The present invention relates to a transmission shift device capable of shifting only in one direction from a neutral position. A snap ring having a circular cross section is fitted into a shift shaft, and a tapered surface is provided on a shaft support portion with which the snap ring comes into contact. It is characterized by the provision of the abutting part of.

[0011]

[Action]

 The shift device of the transmission of the present invention is such that the snap ring fitted in the groove formed in the shaft hits the shaft support portion and prevents the shift shaft from moving further, and the snap ring is tapered. The surface receives a force that pushes it toward the axial center, and its removal is prevented.

[0012]

[Embodiment] Next, as an example of implementation of the present invention, a case where the shift shaft for retreat of the conventional example is implemented will be described with reference to Fig. 1. In this embodiment, the operation of the conventional outer lever 3 The selection of the shift shafts 7, 8 and 9 and the selection of the meshing gear by the forward and backward movement are not different from the conventional ones.

As shown in FIG. 2, a ring groove 20 is engraved on the reverse shift shaft 9 that operates only in one direction, and a snap ring 21 having a circular cross section is fitted into the ring groove 20. The insertion hole 23 of the shift support 22 that is inserted has an end surface on the snap ring 21 side that is an inclined taper surface 23a.

The snap ring 21 abuts the above-mentioned tapered surface 23 a when the shift shaft 9 moves toward the shift support 22 in order to return to the neutral position, so that the shift shaft 9 is further moved. Is something that does not move.

Therefore, the conventional guide plate can be eliminated for the shift shaft 9 for retreat that moves only in one direction from the neutral position. When hitting the outer periphery of the insertion hole 23, this portion has a tapered surface 23a, so that it receives a force that pushes it into the ring groove 20 and prevents its removal.

[0016]

[Effect of the device]

 As described above, according to the present invention, in a shift shaft such as a shift shaft for backward movement that operates in only one direction from the neutral position, the conventional guide plate can be omitted, and the cost is increased. It is possible to reduce costs.

Further, the reliability and the assemblability can be improved, and particularly in a transmission using a pot case, it is not necessary to remove the assembled and disassembled parts, which is particularly effective for this. It is a thing.

[Brief description of drawings]

FIG. 1 is a cross-sectional plan view of an embodiment of the present invention.

FIG. 2 is a sectional view of a main part of the above.

FIG. 3 is a cross-sectional side view of a conventional transmission.

FIG. 4 is an operation diagram of a shift lever.

[Explanation of symbols]

 7, 8, 9 Shift shaft 20 Ring groove 21 Snap ring 22 Shift support 23 Insertion hole 23a Tapered surface

Claims (1)

[Scope of utility model registration request] 1. A shift device of a transmission capable of shifting only in one direction from a neutral position, wherein a snap ring having a circular cross section is fitted to a shift shaft, and a tapered surface is provided on a shaft support portion with which the snap ring contacts. A shift device for a transmission, comprising: