JPH09229190A - Shift stopper device of four-speed transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shift stopper device which allows modification to four- speed transmission from a five-speed transmission without change of the shapes of major components. SOLUTION: A shift operation mechanism is structured so that five speed positions and a reverse position are arranged on the same operating line, and a reverse shift arm 45 is swung in the Reverse direction by turning a shift head 37 fixed to a shift shaft for reversing 32 to the reverse direction, and the reverse position is established when the reverse shift arm 45 moves a reverse idler gear to the reverse meshing position. On a reverse shift arm bracket 47, a stopper member 51 is mounted which has the first stopper surface 50a to make turn stop of the shift head 37 in the direction opposite the engaging direction with the reverse shift arm 45 and the second stopper surface 50b to restrict the shift motion of the shift head 37 in the direction opposite the Reverse direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shift stopper device for a four-speed transmission, and more particularly to a shift stopper device for a four-speed transmission which can be changed to a four-speed transmission without major modification. It is about.

[0002]

2. Description of the Related Art Conventionally, a shift pattern for a fifth-speed transmission has first, second, third, fourth, and fifth reverses.
Are generally arranged on the same shift line. As a fifth-speed / reverse switching mechanism of such a fifth-speed transmission, for example, the one disclosed in Japanese Utility Model Laid-Open No. 7-29352 is known. That is, the shift head is fixed to the fifth-reverse shift shaft, and when the shift head is shifted in the reverse direction, the reverse shift arm engaged with one end of the shift head swings in the reverse direction. Since the reverse shift arm holds both sides of the reverse idler gear, the swing of the reverse shift arm causes the reverse idler gear to shift to the reverse meshing position and establish the reverse gear. On the contrary, when the shift head is shifted in the 5th speed direction, the 5th speed shift fork fixed to the shift shaft shifts the shift sleeve to switch the shift speed to the 5th speed. At this time, the reverse shift arm also tries to swing in the 5th speed direction, but the swinging of the reverse shift arm in the 5th speed direction is restricted by the one-way mechanism.

By the way, when a 5-speed transmission is converted to a 4-speed transmission, not to mention the 5-speed gear and shift sleeve,
The 5th speed shift fork is also removed. However, if the fifth speed shift fork is removed, the fifth speed-reverse shift shaft cannot be stopped, and there is a risk that the shift head and the reverse shift arm will not be reliably engaged.

Therefore, in order to prevent the shift shaft from rotating, a rotation stopper is fixed to one of the two adjacent shift shafts, and the stopper is fitted to the flat surface of the other shaft to prevent the shaft from rotating. A transmission adapted to perform the above is known (see Japanese Utility Model Laid-Open No. 5-8125).

[0005]

However, when the 5-speed transmission is diverted to the 4-speed transmission, not only the detent mechanism for the shift shaft as described above but also the shift shaft is
It is also necessary to provide a stopper mechanism that prevents shifting in the speed direction. As described above, if the rotation stopping mechanism of the shift shaft and the stopper mechanism of the shift shaft are separately provided, not only the number of parts increases but also the structure becomes complicated, which causes a problem of cost increase.

Therefore, an object of the present invention is to provide a shift stopper device for a four-speed transmission that can be changed to a four-speed transmission without changing the shape of the main parts of the five-speed transmission. Another object of the present invention is to provide a shift stopper device for a four-speed transmission that has a small size of parts and can reduce the cost.

[0007]

In order to achieve the above object, the present invention comprises a shift head fixed to a reverse shift shaft, comprising a gear shift operation mechanism in which fifth speed and reverse are arranged on the same operation line. The reverse shift arm engaged with the shift head swings in the reverse direction by operating the reverse gear, and the reverse shift arm shifts the reverse idler gear to the reverse meshing position to establish the reverse gear. In the four-speed transmission, a first stopper surface for preventing the shift head from rotating in the direction opposite to the engagement direction with the reverse shift arm, and a second stopper surface for restricting the shift movement of the shift head in the fifth speed direction. And a stopper portion having and is provided on a fixed portion such as a transmission case.

The shift head is moved in the reverse direction (5
When trying to shift in the (fast direction), the shift head hits the second stopper surface of the stopper portion and the shift movement is restricted. Further, since the shift head is prevented from rotating in the direction opposite to the engaging direction with the reverse shift arm by the first stopper surface of the stopper portion, the shift head and the reverse shift arm are not disengaged from each other. Therefore, it is not necessary to separately provide a rotation stop mechanism and a stopper mechanism for the shift shaft, and the 5-speed transmission can be diverted to the 4-speed transmission with a minimum increase in parts and a minimum change in shape.

It is desirable to provide the reverse shift arm bracket with a stopper portion having a first stopper surface and a second stopper surface. This is because the reverse shift arm bracket is provided at a position close to the tip end portion of the shift head, so that the shape of the stopper portion can be reduced. In this case, there are a method of directly forming the first stopper surface and the second stopper surface on the reverse shift arm bracket, and a method of fixing another component having the first stopper surface and the second stopper surface to the reverse shift arm bracket. Although conceivable, the former method requires changing the shape of the reverse shift arm bracket itself, while the latter method hardly requires changing the shape of the reverse shift arm bracket, so that the cost can be reduced.

[0010]

1 shows an example of a transmission for a vehicle according to the present invention. In this transmission, an FR type 5-speed type transmission is diverted to a 4-speed transmission. The input shaft 1 is connected via a clutch 2 to an engine output shaft (not shown). The output shaft 3 is arranged coaxially with the input shaft 1, and the sub shaft 4 is arranged in parallel with the shafts 1 and 3.

A first speed gear 5, a reverse gear 6 and a second speed gear 7 are integrally formed on the input shaft 1. Normally, the fifth speed gear and the fifth speed switching synchronizing device are arranged adjacent to the rear portion of the second speed gear 7, but the lubricating hole 1a is sealed instead of these gears and synchronizing device. The plug 8 and the spacer 9 (see FIG. 2) are arranged. A third speed gear 10 is rotatably supported at the rear part of the spacer 9, and a reduction driven gear 11 is integrally formed at the front end part of the output shaft 3 facing the third speed gear 10. The input shaft 1 is provided between the third speed gear 10 and the output shaft 3.
Is selectively connected to the third speed gear 10 or the output shaft 3
A -4th speed switching synchronizer 12 is provided. Input shaft 1
The rear end portion terminal is inserted into the front end portion of the output shaft 3 and is rotatably supported.

At the front end of the counter shaft 4, a first speed gear 5 and a second speed gear 5 are provided.
Transmission gears 13 and 14 that mesh with the high speed gear 7 are rotatably supported.
-Speed switching synchronizer 15 selectively connected to
Is provided. A reverse gear 16a is integrally formed on the shift sleeve 16 of the synchronizer 15. The gear 16a can mesh with a reverse gear 6 integrally formed on the input shaft 1 via a reverse idler gear 17. Is. Further, a transmission gear 18 that meshes with the fifth speed gear is integrally formed at the center of the sub shaft 4,
Since the fifth speed gear has been removed, the transmission gear 18 is idling. A transmission gear 19 that meshes with the third speed gear 10 is also integrally formed on the sub shaft 4, and a reduction drive gear 20 that constantly meshes with the reduction driven gear 11 of the output shaft 3 is integrally formed on the rear portion of the sub shaft 4. ing. The clutch 2 is housed in the clutch housing 21, and the transmission mechanism is housed in the transmission case 22.

Next, the gear shift operation mechanism of the above transmission will be described with reference to FIG.
~ It demonstrates according to FIG. Inside the transmission case 22, three shift shafts 30 to 32 are arranged in parallel, and both ends thereof are slidably supported by the clutch housing 21 and the bearing holes 21a, 22a of the transmission case 22. There is. The shift shaft 30 is for 1-2 speed switching, and the fork head 33 and 1-2 are provided on the shaft 30.
The speed shift fork 34 is fixed. The shift shaft 31 is for 3-4 speed switching, and a fork head 35 and a 3-4 speed shift fork 36 are fixed to the shaft 31. Further, the shift shaft 32 is for reverse, and a reverse shift head 37 integrated with a fork head is fixed to the shaft 32. In the case of a 5-speed transmission, a 5-speed shift fork is fixed to the shift shaft 32.

A shift inner lever 40 can be selectively engaged with the grooves of the fork heads 33, 35 and 37. When the select outer lever 41 is operated in the select direction as shown in FIG. 4, the shift & select shaft 42 is moved.
Moves in the axial direction, and the shift select lever 40 engages with the groove of any of the fork heads 33, 35, 37. When the shift outer lever 43 is operated in the shift direction, the shift & select shaft 42 rotates, and the shift inner lever 40 selects the fork heads 33, 3 selected.
It is possible to shift 5 and 37.

As shown in FIG. 6, a groove 37a is formed at the tip of the reverse shift head 37, and this groove 37a is formed.
Is engaged with an intermediate pin 46 that is movably provided at an intermediate portion of the reverse shift arm 45. One end of the reverse shift arm 45 is attached to the clutch housing 21 with the bolt 4
A reverse shift arm bracket 47 fixed by 9 is swingably supported via a fulcrum pin 48. The intermediate pin 46 is used for the reverse shift arm 4
5 long hole 45a and reverse shift arm bracket 47
Is engaged with the long hole 47a. Reverse shift arm 4
The other end of 5 is formed in a bifurcated shape, and these bifurcated parts hold both side surfaces of the reverse idler gear 17 (see FIG. 7). When the shift head 37 moves in the reverse direction,
The reverse shift arm 45 swings in the reverse direction via the intermediate pin 46 and shifts the reverse idler gear 17 to the reverse meshing position, whereby the reverse gear can be established. The reverse shift arm 45 is biased in the anti-reverse direction by a spring 52 (see FIG. 3), and normally stops at a neutral position against a stopper surface (not shown).

The reverse shift arm bracket 47 has a first stopper surface 50 for preventing the shift head 37 from rotating in the direction opposite to the engaging direction with the reverse shift arm 45.
A stopper member 50 having a and a second stopper surface 50b that restricts shift movement of the shift head 37 in the reverse direction and the reverse direction is fixed by a rivet 51 (see FIG. 6). The first stopper surface 50a extends long in the axial direction of the shift shaft 32 so that the shift head 37 can always contact the back surface of the shift head 37 from the neutral position to the reverse position. Stopper member 5
A bent piece 50c is formed at one end of 0, and the bent piece 50c is locked to the side edge of the reverse shift arm bracket 47. Therefore, it is possible to prevent the stopper member 50 from rotating together when the back surface of the shift head 37 hits the first stopper surface 50a. The stopper member 50 and the reverse shift arm bracket 47 may be fixed by any means such as rivet fixing, bolt fixing, and welding.

In FIG. 6, the reverse shift arm 45 is shown.
Although it is arranged inside the reverse shift arm bracket 47, it may be arranged outside as shown in FIG. 7. Further, in FIG. 6, the shift head 37 is prevented from rotating in the engaging direction with the reverse shift arm 45 by the side surface of the reverse shift arm 45, but in FIG. There is. Further, the intermediate pin 46 may be used as a stopper, and further, the stopper member 50 is provided with a separate stopper surface facing the first stopper surface 50a, and the shift head 37 is provided between these stopper surfaces.
May be stopped in both directions.

The operation of the shift operation mechanism having the above-described structure, particularly the positioning structure of the reverse shift head 37, will be described. First, when the shift head 37 is operated in the reverse direction, the reverse shift arm 45 swings in the reverse direction via the intermediate pin 46 engaged with the groove 37a of the shift head 37. As a result, the reverse idler gear 17 whose both sides are held by the reverse shift arm 45 is shifted in the reverse direction, and the reverse gears 16a, 6
And the reverse gear is established.

On the contrary, when the shift head 37 is operated in the fifth speed direction, the tip of the shift head 37 is stopped by the stopper member 50.
It hits the second stopper surface 50b and stops. Therefore, not only the shift head 37 but also the reverse shift arm 4
There is no fear that the fifth gear will move in the fifth speed direction from the neutral position.

Further, since the shift head 37 is prevented from rotating by the first stopper surface 50a of the stopper member 50 in the entire region from the neutral position to the reverse position, the engagement between the shift head 37 and the intermediate pin 46 can be released. There is no.

The present invention is not limited to the above embodiment. In the above embodiment, the stopper member 50 having the first stopper surface 50a and the second stopper surface 50b is fixed to the reverse shift arm bracket 47.
The stopper surface and the second stopper surface may be formed integrally with the reverse shift arm bracket 47. Further, the stopper member 50 may be fixed to a component other than the reverse shift arm bracket 47, for example, a fixed portion such as a transmission case or a clutch housing. It goes without saying that the present invention can be applied not only to the FR type transmission but also to the FF type transmission.

[0022]

As is apparent from the above description, according to the present invention, the first stopper surface for preventing the shift head from rotating in the direction opposite to the engaging direction with the reverse shift arm, and the shift head in the fifth speed direction. Since the stopper portion having the second stopper surface for restricting the shift movement to the shift shaft is provided on the fixed portion such as the transmission case, the rotation stop mechanism of the shift shaft and the stopper mechanism of the shift shaft can be configured easily and for the fifth speed. The transmission can be easily changed to a 4-speed transmission. Moreover, since it is not necessary to change the shapes of the main parts, and the four-speed transmission can be configured with the minimum increase of the parts and the minimum change of the shapes, the cost increase can be suppressed as much as possible.

[Brief description of drawings]

FIG. 1 is an overall sectional view of an example of a four-speed transmission according to the present invention.

FIG. 2 is a partially enlarged view of FIG.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is a perspective view of a shift operation mechanism.

FIG. 5 is a plan view of a shift operation mechanism.

FIG. 6 is a perspective view showing a main part of the present invention.

FIG. 7 is a side view showing a relationship between a reverse shift arm and a reverse idler gear.

[Explanation of symbols]

 17 Reverse Idler Gear 21 Clutch Housing 22 Transmission Case 32 Reverse Shift Shaft 37 Reverse Shift Head 45 Reverse Shift Arm 47 Reverse Shift Arm Bracket 50 Stopper Member 50a First Stopper Surface 50b Second Stopper Surface

Claims (2)

[Claims] 1. A reverse gear engaged with a shift head, comprising a gear shift operation mechanism in which fifth speed and reverse are arranged on the same operation line, and a shift head fixed to a reverse shift shaft is operated in the reverse direction. In the four-speed transmission in which the shift arm swings in the reverse direction and the reverse shift arm shifts the reverse idler gear to the reverse meshing position to establish the reverse gear, the shift head is used as the reverse shift arm. A stopper portion having a first stopper surface for preventing rotation in a direction opposite to the engaging direction of the gear and a second stopper surface for restricting shift movement of the shift head in the fifth speed direction is provided on a fixed portion such as a transmission case. A shift stopper device for a four-speed transmission, characterized in that 2. The four-speed transmission according to claim 1, wherein the stopper portion is provided on a reverse shift arm bracket that swingably supports the reverse shift arm. Machine shift stopper device.