JPS61248944A - Change device for transmission for vehicle - Google Patents

Abstract

PURPOSE:To prevent the occurrence of malfunction of a forward shift fork, according to the method wherein, during operation of a reverse shift fork, inertia rotation of an input shaft is prevented from occurring through the synchronous action of the synchronous mechanism of a forward gear train, and a stopper prevents a shift piece from entring a recessed part in a shift piece. CONSTITUTION:A cam mechanism 57, shifting a shift fork 23 by a distance of a low stroke L in linkage with a reverse shift fork 39, operated from a position (a) to a position (b) of a reverse idle gear 6, is situated between the shift fork 39, shifting the reverse idle gear 6 form the position (b) to a position (c), and a forward shift fork 23. A recessed part 60, allowing only the low stroke shift motion of the shift fork 23, is formed in an interlock plate 45. A stopper 64, preventing a shift piece 22a from entering the recessed part 60 by making contact with the outer surface of the interlock plate 46 into contact, is mounted to a shift piece 22a of a shift fork 22 positioned facing the recessed part 60 when a change lever is present in a neutral position.

Description

Detailed Description of the Invention A0 Objective of the Invention (1) Industrial Application Field The present invention relates to a multi-stage forward gear train established through a synchronization mechanism, and a reverse gear train established by sliding engagement of reverse idle gears. The present invention relates to an improvement in a change device for a vehicle transmission equipped with a gear train, and particularly in a change device that prevents gear squeal when a reverse idle gear is shifted to establish a reverse gear train.

(2) Conventional technology In the transmission described above, even if the clutch is first disengaged to establish the reverse gear train, the input shaft, which had been rotated by the engine until then, continues to rotate due to inertia, albeit for a short time. Therefore, if the reverse idle gear is shifted, that is, slidingly engages, during its inertial rotation, an abnormal noise called gear squeal is generated, causing discomfort to the occupants.

A change device designed to eliminate such inconveniences is disclosed in Japanese Utility Model Application Publication No. 59-68848.

The disclosed device includes a reverse shift fork for shifting a reverse idle gear from its rest position to a reverse gear train establishment position and a forward shift fork for establishing one forward gear train. A resilient mechanism is provided that can shift the shift fork in the direction of establishing the one forward gear train in response to the reverse idle gear being operated from the rest position to the reverse gear train establishing position, and the resilient mechanism is configured to operate at a predetermined value. It is configured to deform and lose the shifting function for the forward shift fork when subjected to an operating load above, and when the forward shift fork is shifted by this resilient mechanism, only a synchronizing action is performed on the synchronizing mechanism corresponding to the shift fork. In order to achieve this, the shift piece of the shift fork is brought into contact with the bottom of the recess of the interlock plate facing it, and the inertial rotation of the input shaft is stopped by the same 1υ1 action of the synchronization mechanism just before the reverse gear train is established. Or it is made to be weakened.

(3) Problems to be Solved by the Invention In the above-mentioned conventional device, when the reverse shift fork is operated rapidly, the spring mechanism deforms early during the synchronization of the synchronization mechanism, causing damage to the input shaft. Rotation may not be suppressed satisfactorily, and each time the reverse shift fork is operated, the deformation load of the spring mechanism acts on the contact area between the shift piece and the interlock plate, causing collision noise. Not only do they emit light, but they also have drawbacks such as impairing the durability of their abutting portions to some extent.

An object of the present invention is to provide the change device that eliminates such drawbacks.

B0 Structure of the Invention (1) Means for Solving Problems In order to achieve the above object, the present invention provides a reverse shift fork for shifting a reverse idle gear from its rest position to a reverse gear train establishing position; a forward shift fork for establishing two forward gear trains; and a forward shift fork for establishing two forward gear trains; A cam mechanism is provided that shifts the corresponding synchronizing mechanism by a prescribed small stroke sufficient to exert only the synchronizing action, and when the change lever is shifted to the reverse position, the interlock plate facing the shift piece of the forward shift fork is provided with A recess that allows only the small stroke shift operation of the forward shift fork is provided, and when the change lever occupies the neutral position, the shift piece of another forward shift fork facing the recess is provided with an outer surface of the interlock plate. The present invention is characterized in that a stopper is provided in contact with the shift piece to prevent the shift piece from entering the recess.

(2) Effect When the reverse shift fork is operated to establish the reverse gear train, first, while the reverse shift fork is operating from the rest position of the reverse idle gear to the position on the verge of establishing the reverse gear train, the cam mechanism operates to reliably shift the forward shift fork of one forward gear train by a predetermined small stroke, causing only a synchronous action in the synchronization mechanism of the forward gear train, and accurately suppressing inertial rotation of the input shaft. be able to. Therefore, further actuation of the reverse shift fork allows the reverse idle gear to be smoothly shifted to the established position of the reverse gear train without causing gear squeal.

During this time, the small stroke shift operation of the forward shift fork is permitted by the recess of the interlock plate.
Collision between the shift piece of the forward shift fork and the interlock plate can be avoided.

When the change lever is returned to the neutral position, the recess faces the shift piece of another forward shift fork, but due to the contact between the stopper specially provided on the shift piece and the outer surface of the interlock plate having the recess, The shift piece is prevented from entering the recess, and the forward shift fork is prevented from malfunctioning.

(3) Examples An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an outline of an automobile power unit 7) equipped with a transmission M having four forward speeds and one reverse speed to which the present invention is applied. In the figure, the output of the engine E is transmitted sequentially from its crankshaft through the clutch C1, transmission M, and differential device to the left and right wheel drive shafts S.

S' and drive them.

Between the person and the output shafts 11i and 10 supported parallel to each other by the mission case 1o of the transmission M, there are, in order from the engine E side, a forward first speed gear train, a reverse gear train Gr, a forward second speed gear train G2 to A fourth gear train G4 is provided in parallel. 1~
The 4th speed gear train G, ~G4 includes input gears 11 to 41 fixed to the input shaft 11i, and an output gear 10 rotatably supported by the output shaft 11o and constantly meshing with the corresponding input gear.
4o, and between the output gear 1o and the 2nd speed output gear 20, there is a 1st-2nd speed interval mechanism 7 which can alternately couple these to the output shaft 110, and a 3rd speed output gear train. Between the 3o and 4th speed output gears 40, these are alternately connected to the output shaft 11o.
A 3rd and 4th speed interphase mechanism 8, which can be coupled to the 3rd and 4th gears, is provided respectively.

Thus, the 1st speed output gear 1 is
If the 0 or 2 speed output gear 20 is coupled to the output shafts 11, O, a 1 speed gear train G1 or a 2 speed gear train G2 is established.

In addition, the 3rd speed output gear 30 is
Or, if the 4-speed output gear 40 is coupled to the output shaft 110,
Third speed gear train G3 or fourth speed gear train G4 is established. The gear train thus established transmits the output torque of the engine E from the input shaft 11i to the output shaft 110 at a predetermined gear ratio.

The torque transmitted to the output shaft 11o is transmitted to the final reduction gear train G.
It is transmitted to the differential gear via f.

The reverse gear train Gr includes an input gear 51 fixed to the input shaft 11i, and an output gear 5o carved in the sliding sleeve 7a of the 1st-2nd speed interphase mechanism 7 opposite to the input gear 51. ,
The person is slidably and rotatably supported on an intermediate shaft 14 disposed parallel to the mountain shafts 11i and llo, and the person,
It consists of a reverse idle gear 6 that can move between an operating position in which it meshes with the output gears 5t+50 at the same time and a rest position in which it disengages from them. When the reverse idle gear 6 is moved to the operating position where it meshes with the output gears 11i and llo, the reverse gear train Gr is established and the input shaft 11i
The torque is applied to the output shaft 1 via the input gear 51, the reverse idle gear 6, the output gear 5o, and the 1st-2nd speed interphase mechanism 7.
1o and can be reversed.

Next, 1st to 4th speed gear trains G, ~G4 and reverse gear train Gr
A change device for establishing this will be explained with reference to FIGS. 2 to 8.

First, Figure 2 shows the operation pattern of the change lever of the change device, where N is the neutral position, ■ is the first gear position, and ■
is the 2nd speed position, ■ is the 3rd speed position, ■ is the 4th speed position, and R is the reverse position.

In FIGS. 3 and 4, a change rod 17 interlocked with the change lever is supported by the transmission case 10 so as to be slidable and rotatable. This change loft 17
The actuation arm 18 fixed to the tip of the shift arm 1
9 is connected to a driven arm 19a integrally formed with the arm 19a.

The shift arm 19 is rotatably and slidably supported on a support shaft 20 extending in a direction perpendicular to the change rod 17, and when the change lever is operated in the select direction A in FIG. It is slid by rotation, and when operated in the shift direction B, it is rotated by sliding of the change rod 17.

The support shaft 20 is supported by a support plate 21 fixed to the transmission case 10.

Three shift pieces 22a, 23a, and 24a are disposed on the trajectory of the tip of the shift arm 19 as it slides.

The shift arm 19 is connected to the I of the change lever.
- When selecting the n position, the upper shift piece 2 in Figure 4
2a, and also engages with the N of the change lever.
When selecting the position, that is, ■-■ position, it engages with the engagement groove 23a of the center shift piece 23a, and when selecting the R position of the change lever, it engages with the engagement groove 24b of the lower shift piece 24a. There is.

The upper shift piece 22a is connected to the 1st-2nd speed shift fork 22 that engages with the sliding sleeve 7a of the 1st-2nd speed interphase mechanism 7, and the middle shift piece 22a is connected to the 3rd-speed shift fork 22 that engages with the sliding sleeve 7a of the 1st-2nd speed interphase mechanism 7.
3-4 that engages with the sliding sleeve 8a of the 4th speed interphase mechanism 8
to the speed shift fork 23 and the lower shift piece 24
a are integrally connected to the reverse shift member 24, respectively.

As shown in FIG. 3, the 1-2nd speed shift fork 22 and the 3rd-4th speed shift fork 23 are connected to the transmission case 10.
Each of the fork shafts 27 is slidably supported by a fork shaft 27 whose both ends are fitted into a pair of support holes 25 and 26. When the shift arm 19 is engaged with the upper shift piece 22a and rotated left and right as shown in FIG.
- Set the second speed interphase device 7 to 1. 2nd speed gear train G,,G.

can be operated to the established position. Also, by engaging the shift arm 19 with the center shift piece 22a and rotating it left and right, the 3rd-4th speed shift fork 23 can be moved to the fork shaft 27.
3-4 speed interphase device 8 by sliding it left and right on the top.
4-speed gear train G,,G.

can be operated to the established position.

Between the 1st-2nd speed shift fork 22 and the fork shaft 27, the shift fork 22 is connected to the 1st-2nd speed interphase mechanism 7.
The first gear is held in three positions: the rest position of the gear train Gl, the established position of the first gear train Gl, and the established position of the second gear train G2.
A detent device 28 is provided. In addition, between the 3rd and 4th speed shift fork 23 and the fork shaft 27, the shift fork 23 is positioned at the rest position of the 3rd and 4th speed interphase mechanism 8, the established position of the 3rd speed gear train G, and the established position of the 4th speed gear train G. Second detent device 2 for moderately holding row G4 in three established positions
9 is provided. These detent devices 28,29 are
All of them are constructed in a well-known ball-and-notch type.

A pin 33 that engages with a locking groove 32 formed in the transmission case 10 is fixed to one end of the fork shaft 27 in order to lock the fork shaft 27 . Further, a holding spring 34 is provided in one of the support holes 25 and 26 of the transmission case 10 to press the fork shaft 27 against the end wall of the other support hole. This prevents the fork shaft 27 from freely moving in the support hole 25, 26, thereby stabilizing the positions of both shift forks 22, 23.

The reverse shift member 24 is supported by a reverse shift shaft 37 which is disposed parallel to the fork shafts 2 and 7 and is supported by slidably fitting both ends into another pair of support holes 35 and 36 of the transmission case 10. Fixed. Further, a support arm 24C is integrally formed with the reverse shift member 24, and this support arm 24c has a sliding groove 43 at its tip.
is engaged with a fixed guide rod 44 parallel to the reverse shift shaft 37 to allow the reverse shift member 24 to slide while preventing its rotation.

Furthermore, the reverse shift member 24 has a driving pin 38 protruding from its negative side, and this driving pin 38 is connected to a long hole 40 formed in the middle part of the reverse shift fork 39, as shown in FIG. is engaged with. The reverse shift fork 24 is pivotably supported 41 on the support plate 21 and is engaged with an engagement groove 42 formed on the outer periphery of the boss portion of the reverse idle gear 6 .

Then, the shift arm 19 is moved to the lower shift piece 2.
4a and rotates to the right in FIG. 3, the reverse shift member 24 moves to the right together with the reverse shift shaft 37.
The drive pin 38 moves the reverse shift fork 39 to the fifth position.
By swinging to the left in the figure, the reverse idle gear 6 can be shifted from the locking position A to the establishment position C of the reverse gear train Or (see FIG. 5).

The reverse shift member 24 is connected to the reverse idle gear 6 between the reverse shift shaft 37 and the transmission case 10.
A third detent device 30 is provided for holding the reverse gear train Gr at the rest position A and the established position C of the reverse gear train Gr, and this detent device 30 is also constructed in a known ball-notch type.

Referring again to FIGS. 3 and 4, a pair of interlock plates 45, 46 are disposed on both sides of the shift arm 19.

These interlock plates 45, 46 are connected to the shift arm 19.
It is fitted in a relatively rotatable manner to the boss 19b, and is slidably fitted in a rotation stop pin 47 fixed to the support plate 21 in a state parallel to the support shaft 20. Therefore, the interlock plates 45, 46 can slide on the support shaft 20 together with the shift arm 19, but cannot rotate around the support shaft 20.

However, rotation of the shift arm 19 is allowed.

Both ends of a stopper pin 48 parallel to the support shaft 20 are fixed to these interlock plates 45 and 46 by caulking, and this stopper pin 48 is arranged in a regulating recess 49 provided on one side of the shift arm 19. . When the shift arm 19 rotates, the end wall of the regulating recess 49 and the stopper pin 47 come into contact with each other, thereby changing the rotation angle of the shift arm 19, and therefore each shift fork 22, 23 and the shift member 2.
4 shift stroke is regulated.

The interlock plates 45 and 46 are regulating claws 45a that face each other with the tip of the shift arm 19 interposed therebetween.

46a, and these regulating claws 45a, 4
6a indicates two shift pieces (for example, 22) other than one shift piece (for example, 23) with which the shift arm 19 engages.
．． 24) to prevent malfunction of the two shift pieces.

A first return spring 51 is compressed between the outer surface of one of the interlocking plates 45 and the support plate 21. Further, an annular shoulder 20a is formed at the end of the shift arm 19 on the opposite side to the interlock plate 45, and a position regulating plate is formed opposite to the shoulder 20a and the end of the shift arm 19 adjacent to the shoulder 20a. 53 is disposed, and a second return spring 52 is compressed between the outer surface of the position regulating plate 53 and the support plate 21. The set load of the second return spring 52 is set larger than that of the first return spring 51.

By the cooperation of the first and second return springs 51 and 52 and the position regulating plate 53, the shift arm 19 is moved to the position corresponding to the N position of the change lever, that is, the shift piece of the 3rd-4th speed shift fork 23. 23a, and is constantly biased to the neutral position where it engages with 23a. When the shift arm 19 is slid against the elastic force of the first return spring 51, the arm 19 engages with the shift piece 22a of the 1st-2nd speed shift fork 22, and the arm 19 is moved into the second position. When the arm 19 is slid against the elastic force of the return spring 52, the arm 19 engages with the shift piece 24a of the reverse shift member 24. A fourth detent device 31 that moderates the sliding movement of the shift arm 19 is provided between the shift arm 19 and the support shaft 20.

In FIG. 3, reference numeral 50 denotes a back lamp switch that closes when the reverse shift member 24 is activated.

In FIG. 5, the reverse shift fork 39 is integrally connected with a swing arm 54 that faces the side surface of the 3-4 speed shift fork 23 in the axial direction of the fork shaft 27. A pair of driving and driven cams 55 and 56- are respectively protruded from the surface facing the 4-speed shift fork 23. These cams 55 and 56 cooperate with each other to shift the 3-4 speed shift fork 23 while the reverse shift fork 39 shifts the reverse idle gear 6 from the rest position A to the position on the verge of establishment of the reverse gear train Gr. It is formed so that it can shift with a small stroke L in the direction of establishment of the 4th speed gear train G4, and the small stroke L is
- The setting is such that the four-speed interphase mechanism 8 is sufficient to perform a synchronizing action, but not enough to establish the fourth gear train G4.

In this case, as described above, the fork shaft 27 is held by the retaining spring 3.
It is always stabilized in the fixed position by cam 55.5.
This is extremely effective in accurately obtaining the prescribed small stroke L of the 3-4 speed shift fork 23 according to No. 6.

Therefore, in order to establish the reverse gear train Gr, first the clutch C
When the change lever is shifted from the R select position to the shift position, the shift arm 19 operates the reverse shift member 24 to shift the reverse shift fork 3.
9 to the left in Fig. 5. Then, the fork 39
As shown in FIG. 5A, while the reverse idle gear 6 is shifted from the rest position A to the position on the verge of establishment of the reverse gear train Gr, the driving cam 55 is moved to the driven cam 56 by the swinging of the swinging arm 54. , and shifts the 3-4 speed shift fork 23 by a specified small stroke L in the direction of establishing the 4-speed gear train G4, so that the synchronizing action σ of the 3-4 continuous interphase mechanism 8 is obtained, and the input shaft The inertial rotation of 11i can be stopped or weakened. Therefore, due to the progress of the rotation of the reverse shift fork 39, the reverse idle gear 6
By shifting the gear to the established position of the reverse gear train Gr, it is possible to smoothly mesh the gear with the output gear 51 and 50 without causing gear squeal.

In the above, the swinging arm 54, the driving and driven cams 55.5
6 constitutes a cam mechanism 57 of the present invention.

It is preferable that at least one of the cams 55 or 56 be formed of a roller, since this allows the cam mechanism 57 to operate more smoothly.

When the reverse shift member 24 is operated as described above, 3-4
In order to allow the movement of the speed shift fork 23 by a prescribed small stroke L in the direction of establishing the fourth speed gear train G4, as shown in FIG. Interlock plate 45c) 2. (1
A recess 60 is provided on one side of the 14 claws 45a. Therefore, when the 3rd-4th speed shift fork 23 is slightly shifted in the direction of establishing the 4th speed gear train G4, a part of the shift piece 23a enters the recess 60 and engages the restriction pawl 45a of the interlock plate 45. interference can be avoided.

Slopes 61 and 62 are formed at the opposite corners of the shift arm 19 and the portion of the shift piece 23a that enters the recess 60 of the regulating pawl 45a.

When the change lever is returned from the R shift position to the N position in FIG. 2 in order to release the establishment of the reverse gear train Gr, the shift arm 19 first moves the shift piece so that the reverse idle gear 6 is returned to the rest position. 24a is moved back. Then, the first and second return springs 51 and 52 and the position regulating plate 5
3, the shift arm 19 and the interlock plates 45 and 46 are returned to the neutral position corresponding to the N position in FIG. Collide and shift piece 23
a can be returned to its original position.

When the shift arm 19 occupies the neutral position, the recess 60 of the restriction pawl 45a of the interlock plate 45 faces the shift piece 22a of the l-2 speed shift fork 22. Therefore, in order to prevent the shift piece 22a from entering the recess 60, a regulating pawl 45a is provided on the outer surface of the shift piece 22a.
A stopper 64 is integrally provided to protrude from the outer surface of the holder.

Therefore, even when the recess 60 faces the shift piece 22a, the contact between the stopper 64 and the outer surface of the regulating pawl 45a prevents the 1st-2nd speed shift fork 22 from malfunctioning in the direction of establishing the 2nd speed gear train Gt. It can be prevented.

C0 Effects of the Invention As described above, the present invention provides a reverse shift fork for shifting a reverse idle gear from its rest position to a reverse gear train establishment position, and a forward shift fork for establishing one forward gear train. During this period, in response to the reverse shift fork operating from the rest position of the reverse idle gear to a position on the verge of establishing the reverse gear train, the forward shift fork has a provision sufficient to cause the corresponding synchronization mechanism to exert only a synchronizing action. A cam mechanism is provided to shift the change lever by a small stroke, and when the change lever is shifted to the reverse position, an interlock plate facing the shift piece of the forward shift fork has a recess that allows only the small stroke shift operation of the forward shift fork. is provided, and when the change lever occupies the neutral position, a shift piece of another forward shift fork facing the recess comes into contact with an outer surface of the interlock plate to prevent the shift piece from entering the recess. Since the stopper is provided, when the reverse shift fork operates, regardless of the operating speed, only a synchronizing action is generated in the synchronizing mechanism of the forward gear train, and the inertial rotation of the input shaft is reliably suppressed. gear noise can be prevented.

Moreover, at this time, the shift piece of the forward shift fork and the interlock plate do not collide, so there is no collision noise and their durability is not impaired.

Furthermore, even though the interlock has the recess, when the change lever is returned to the neutral position, the stopper can prevent the shift piece of another forward shift fork from entering the recess. Malfunction of the fork can be prevented, and the original function of the interlock plate is not impaired in any way.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a schematic diagram of an automobile power unit equipped with a transmission to which the present invention is applied, FIG. 2 is a change lever operation pattern diagram of the change device of the present invention, and FIG. 3 is a vertical sectional front view of the change device of the present invention, FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3, FIG. 5 is a view taken in the direction of the ■ arrow in FIG. 4, and FIG. Figure, 6th
The figure is a sectional view taken along the line Vl--Vl of Fig. 4, Fig. 7 is a partially exploded perspective view of the main parts of the change device, Fig. 8 is a sectional view taken along the line ■-■ of Fig. 4, and Figs. 8A and 8B. is an operation explanatory diagram of FIG. 8. C...Clutch, E...Engine, D...Differential gear, G1-G4...Forward 1st to 4th speed gear train, Gr...
・Reverse gear train, L... specified small stroke, M...
Transmission, 7...1-2 speed timing mechanism, 8...3-4
Rapid interphase mechanism, 10...Mission case, lli.
...Input shaft, 11o...Output shaft, 22...1-2 speed shift fork, 22a...Shift piece, 23...
・3-4 speed shift fork, 23a...Shift piece, 24...Reverse shift member, 24a...Shift piece, 45...Interlock plate, 45a...Regulation pawl, 46...Inter Lock plate, 46a...regulating claw,
54... Swinging arm, 55... Drive cam, 56... Driven cam, 57... Cam mechanism, 6°... Recessed portion, 64...
...Stofpa Fig. 8 Fig. 88 Fig. 7

Claims (1)

[Claims] In a change device for a vehicle transmission equipped with a multi-stage forward gear train established through a synchronization mechanism and a reverse gear train established by sliding engagement of reverse idle gears, the reverse idle gear is changed from its rest position to the reverse gear train. Between the reverse shift fork for shifting to the train establishing position and the forward shift fork for establishing one forward gear train, the reverse shift fork operates from the rest position of the reverse idle gear to the position on the verge of establishing the reverse gear train. A cam mechanism is provided that shifts the forward shift fork by a prescribed small stroke sufficient to cause the corresponding synchronizing mechanism to exert only a synchronizing action in response to the change lever being shifted to the reverse position, and when the change lever is shifted to the reverse position, the forward shift fork is shifted. An interlock plate facing the shift piece of the fork is provided with a recess that allows only the small stroke shift operation of the forward shift fork, and when the change lever is in the neutral position, the interlock plate of the other forward shift fork facing the recess is provided with a recess that allows only the small stroke shift operation of the forward shift fork. A change device for a vehicle transmission, characterized in that the shift piece is provided with a stopper that comes into contact with an outer surface of the interlock plate to prevent the shift piece from entering the recess.