JPH06221434A - Shift rod supporting structure for transmission and its assembling method - Google Patents

Abstract

PURPOSE:To provide a shift rod supporting structure and its assembling method which facilitates the assembling of a shift rod to a supporting member and can correspond to automatic assembly. CONSTITUTION:A shift rod support section is composed of a fitting hole 34c provided to support a shift rod 28 at its end and a detent member 46 which is provided in the fitting hole 34c and elastically protruded from the inner periphery of the fitting hole 34c. In a shift rod supporting structure 20 for a transmission having the detent member 46 which selectively engages with a plurality of engaging parts 28a, 28b, 28c longitudinally formed along the shift rod 28 to prescribe the longitudinal position of the shift rod 28 to a plurality of stages, the wall section opposite to the detent member 46 of the fitting hole 34c is longitudinally notched as much as a fixed quantity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shift rod support structure for a transmission in which a detent mechanism is arranged on a support member for supporting a shift rod, and a method of assembling the shift rod support structure.

[0002]

2. Description of the Related Art Generally, a transmission that changes gears in response to an operation of a change lever is capable of rotating an input shaft connected to an engine through a clutch and coaxially with the input shaft independently of the input shaft. And an output shaft in which a plurality of gears for shifting are arranged, and a plurality of gears that mesh with the gears arranged in the output shaft, for transmitting the rotational force of the input shaft to the output shaft. A gear train system including a counter shaft and a synchronizer arranged on the output shaft or the counter shaft, a shift system including a plurality of shift rods having a shift fork for operating a sleeve of the synchronizer, and various accessory mechanisms Etc.

In this type of transmission, there is conventionally known a transmission equipped with a detent mechanism for positioning the shift rod in a neutral position and an operating position and for giving a feeling of nodal motion during a shift operation. For example, as a structure of a conventional detent mechanism, as shown in FIG. 11, a fitting hole 102 is provided in a supporting member 100 attached to a transmission case, and a shift rod 104 is fitted in the fitting hole 102. The shift rod 104 has three engaging grooves 104.
a, 104b, 104c are formed, and the compression coil spring 10 is formed in the recess 100a formed in the support member 100.
6 and a ball 108. The ball 108 is provided with the shift rod 104 by the urging force of the compression coil spring 106.
It is known that the shift rod 104 is held in a predetermined operation position by engaging with the engaging groove of the shift rod. Further, as an interlock mechanism for preventing simultaneous operation of a plurality of shift rods, for example, as shown in the rear of Japanese Patent Laid-Open No. 2-8558, a support member for supporting a plurality of shift rods or a space between the shift rods is mounted. The member is provided with an interlock pin that is movable in a direction orthogonal to the shift rod, and when one shift rod moves to an operating position, the solenoid causes the interlock pin to move to a position that locks the other shift rod. The structure is known.

[0004]

By the way, in recent years, a technique for automatically assembling an automobile has been greatly developed, and automatic assembling by a machine is also required for assembling a transmission. However, the conventional detent mechanism shown in FIG. 11 has a problem that it is not suitable for automatic assembly because the assembly method relies on human feeling.

Here, a method of assembling a conventional detent mechanism will be described. First, in FIG. 11, the fitting hole 1
Through hole 102 formed at a position facing the No. 02 ball
From a, a pressing member 110 for pressing the ball 108
The ball 108 against the biasing force of the compression coil spring 106, and the recess 1 formed in the side wall surface of the fitting hole 102 is inserted.
00a. In this state, as shown in FIG. 11, the shift rod 104 is inserted into the fitting hole 102.
Then, the tip portion of the shift rod 104 has the pressing member 11
0 from the side contacting the side surface
As shown in, the shift rod 104 is pushed out in the direction of the arrow B while being retracted to the outside of the fitting hole 102, and the shift rod 104 is mounted on the ball 108 and the shift rod 104 is inserted into the fitting hole 102. Is to do. That is, in such an assembling method, the timing of retracting the pressing member 110 to the outside of the fitting hole 102 and the timing of pushing the shift rod 104 are difficult. Depending on the timing, the shift rod 104 rides on the ball 108 well. There was a problem that it could not be improved and assembly could fail.

Therefore, the present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a transmission member in which a detent mechanism is arranged on a supporting member for supporting a shift rod. An object of the present invention is to provide a shift rod support structure that facilitates assembling of a shift rod and is compatible with automatic assembly, and an assembling method thereof.

[0007]

In order to solve the above-mentioned problems and to achieve the object, a shift rod supporting structure of a transmission of the present invention is provided for supporting a shift rod at an end portion of the shift rod. A fitting hole that fits into the end portion and a detent member that is provided in the fitting hole, and elastically protrudes from the inner peripheral surface of the fitting hole. , A detent member that selectively engages with a plurality of engaging portions formed along the longitudinal direction of the shift rod to define the longitudinal position of the shift rod in a plurality of stages In the rod support structure, a wall portion of the fitting hole on a side facing the detent member is cut out by a predetermined amount along a longitudinal direction of the shift rod.

Further, according to the method of assembling the shift rod of the present invention, the fitting hole for supporting the shift rod and the recess formed in the inner wall of the fitting hole are arranged so as to project into the fitting hole. A detent member elastically biased in the direction of, and a wall portion of the fitting hole on the side facing the detent member,
A method of assembling a shift rod, wherein the shift rod is mounted on a supporting member having a notch formed over a predetermined length along the extending direction of the fitting hole while inserting the shift rod into the fitting hole. , A pressing member for pressing the detent member is inserted into the fitting hole from the notch,
By the pressing member, the detent member is buried in the recess against the elastic force, withdrawing from the fitting hole, and inserting the shift rod into the fitting hole,
A step of bringing the tip end portion of the shift rod into contact with the side surface of the pressing member; and further inserting the shift rod into the fitting hole, while inserting the shift rod and the pressing member into the fitting hole and the notch. And a step of retracting the pressing member from the fitting hole via the cutout portion.

[0009]

As described above, since the shift rod support structure and the method of assembling the shift rod according to the present invention are configured, the detent member is pressed by the pressing member and is kept retracted from the fitting hole. Since the pressing member and the shift rod can be slid integrally along the fitting hole, the shift rod can be reliably mounted on the detent member, and the shift rod can be easily assembled.
Automatic assembly is possible.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a diagram showing an outline of an assembling procedure of a transmission to which a shift rod support structure and an assembling method thereof according to an embodiment are applied.

In FIG. 1, a transmission 10 includes an input shaft 12 connected to an engine via a clutch, and the input shaft 1
2, an output shaft 14 which is rotatably arranged independently of the input shaft 12 and in which a plurality of gears for shifting is arranged, and a plurality of gears which mesh with the gears arranged in the output shaft 14. And a gear train system 18 having a counter shaft 16 for transmitting the rotational force of the input shaft 12 to the output shaft 14, and an output shaft 14 or a synchronizer arranged on the counter shaft 16.
And a shift system 20 including a plurality of shift rods having a shift fork for operating the sleeve of the synchronizer. Then, the transmission 10
As shown in FIG. 1, the gear train system 18 and the shift system 20 are assembled by covering the assembly with a case 22.

The shift rod support structure and the assembling method thereof according to one embodiment are applied to the shift system 20 in FIG. Next, FIG. 2 to FIG. 10 are diagrams showing an assembly procedure of the shift system 20. First, the structure of the shift system 20 will be described with reference to FIG. 9 showing a substantially completed state of the shift system 20. In FIG.
The shift system 20 is provided with three shift rods 24, 26, 28 which are operated by a shift lever (not shown), and these three shift rods 24, 26, 28 are provided.
Are supported by the support member 30. The support member 30 is
It is composed of a main body 32 and a detent portion 34 which is connected to the front of the main body 32 and in which a detent mechanism described later is arranged. Then, the body portion 32 has insertion holes 32a into which the shift rods 24, 26 and 28 are inserted,
32b and 32c are formed. Further, shift forks 36, 38, 40 are attached to the respective shift rods 24, 26, 28 so as to engage with the sleeves of the synchronizer arranged in the gear train system 18 described above.

Next, the detent mechanism 42 will be described with reference to FIGS. 9 and 10. Detent mechanism 42
Is a mechanism for holding each of the shift rods 24, 26, and 28 so as to stop at three operating positions when they are slid in the longitudinal direction by a shift lever (not shown). By stopping each shift rod at each operating position, a desired gear combination of the gear train system 18 is selected and gear change is performed. Then, the rotational force of the engine is transmitted through the selected combination of gears to the input shaft 12, the counter shaft 16, and the output shaft 1.
4 and are transmitted to the front and rear wheels.

In FIGS. 9 and 10, the detent portion 34 of the support member 30 has a U-shaped groove 34 whose upper side is open.
a, 34b, 34c are formed, and the shift rods 24, 26, 28 are supported in these grooves. FIG. 10B is a side sectional view of a portion of the U-shaped groove 34c on the most front side in FIG. Detent mechanism 42
Are arranged under the U-shaped grooves 34a, 34b, 34c, respectively.
The structure of the detent mechanism 42 arranged in b and 34c is
Since they are all the same, the structure of the detent mechanism 42 arranged in the U-shaped groove 34c will be described as a representative.

In FIG. 10, a recess 34c1 protruding downward is formed on the lower surface of the U-shaped groove 34c, and a steel ball 46 is provided in this recess 34c1 via a coiled compression spring 44. It is arranged. The steel ball 46 is always urged by the urging force of the compression spring 44 in the direction in which it is projected from the recess 34c1. On the other hand, on the lower surface of the shift rod 28, three concave portions 28a, 28b, 28c are formed. Therefore, when the shift rod 28 is slid along the longitudinal direction of the shift rod 28, the steel balls 46 move toward the compression spring 4.
By the biasing force of 4, the concave portions 28a, 28b, 2 at the three locations are
The shift rod 28 is retained in each of the 8c and held in the three slide positions.

Next, the shift system 2 constructed as described above
The assembling procedure of No. 0 will be described with reference to FIGS. First, as shown in FIG. 2, the shift rod 24, the shift rod 24, and the insertion hole 32a, 32b, 32c formed in the support member 30.
Slide bearings 48a, 48b, 48c for slidably supporting 26, 28 are mounted.

Next, as shown in FIG. 3, first and second speed shift forks 40, 3 are provided at predetermined positions with respect to the support member 30.
A fourth speed shift fork 38 and a fifth speed reverse shift fork 36 are arranged. Next, as shown in FIGS. 4A and 4B, the compression spring 44 is inserted into the recess 34c1 formed in the bottom surface of the U-shaped groove 34c of the support member 30, and the steel ball 46 is inserted from above. Mounting.

Next, as shown in FIGS. 5 (a) and 5 (b), the pressing member 50 having a conical recess 50a formed at the tip thereof presses the steel ball 46 into the recess 34c1. Then, as shown in FIG. 6A, the steel ball 46 is retracted into the recess 34c1. In this state, as shown in FIG. 7, after the shift rod 28 is inserted into the insertion hole 40a of the shift fork 40, the tip of the shift rod 28 is inserted into the U-shaped groove 34c1 as shown in FIG. 6A. Then, the tip of the shift rod 28 is brought into contact with the side surface of the pressing member 50.

From this state, the shift rod 28 and the pressing member 50 are slid integrally in the direction of arrow C along the U-shaped groove 34c. At this time, the steel ball 46 is pressed by the pressing member 50.
While being pushed downward by the shift rod 28
However, since it rides above the steel ball 46, the compression spring 44 and the steel ball 46 are reliably pushed into the recess 34c1, and the shift rod 28 moves through the state shown in FIG. 6B. 6 (c) is inserted into the support member 30. In the state shown in FIG. 6C, the pressing member 50 is in contact with the main body 32 of the support member 30, and therefore cannot be slid further in the direction of arrow C. Therefore, at this position, the pressing member 50 is retracted upward (in the direction of arrow D), and the shift rod 28 is further inserted into the slide bearing 48c. As a result, as shown in FIG. 8A, the shift rod 28 is completely assembled with the support member 30.

As described above, in this embodiment, the wall of the insertion hole facing the steel ball 46, that is, the U-shaped groove 34c, is formed so that the pressing member 50 can slide integrally with the shift rod 28. Since the upper part of is notched (opened) along the longitudinal direction of the shift rod 28,
A compression spring 44 and a steel ball 46 that constitute the detent mechanism 42.
Is easily assembled.

Next, as shown in FIG. 8B, a U-shaped groove 34 is formed.
The interlock pin 52 is inserted into the through hole 35c formed in the side wall of c from the direction of the arrow E through the through holes 35a and 35b. The action of the interlock pin 52 prevents the two shift rods from being operated at the same time. As described above, the assembling of the shift rod 28 to the support member 30 is completed. The shift rod 24,
26 is also attached to the support member 30 by the same procedure as the shift rod 28.

Such shift rods 28, 26, 24
When the assembly of the
As shown in FIG. 5, spring pins 58, 56, 54 are inserted into the respective pin holes 40b, 38b, 36b of the first speed second speed shift fork 40, the third speed fourth speed shift fork 38, and the fifth speed reverse shift fork 36. Shift forks 40,3
8 and 36 are fixed to the shift rods 28, 26 and 24. By the above assembling operation, as shown in FIG. 9, FIG.
As shown in (b), the shift system 20 is completed.

As described above, in this embodiment, the wall portion of the insertion hole facing the steel ball 46 so that the pressing member 50 can slide integrally with the shift rods 24, 26, 28. , U-shaped grooves 34a, 34b, 34c
Since the upper part of each is notched (opened) along the longitudinal direction of the shift rods 24, 26, 28, the compression spring 44 and the steel ball 46 that form the detent mechanism 42 can be easily assembled. It is possible to automatically assemble the shift system 20.

The present invention can be applied to modifications and variations of the above embodiments without departing from the spirit of the invention.

[0025]

As described above, according to the shift rod supporting structure and the assembling method thereof of the present invention, the detent member is pressed by the pressing member, and the detent member is pressed while being retracted from the fitting hole. Since the member and the shift rod can be slid integrally along the fitting hole, the shift rod can be reliably mounted on the detent member,
The shift rod can be easily assembled, and automatic assembly is possible.

[Brief description of drawings]

FIG. 1 is a diagram showing an outline of an assembling procedure of a transmission to which a shift rod support structure and an assembling method thereof according to an embodiment are applied.

FIG. 2 is a view showing how a slide bearing is attached to a support member.

FIG. 3 is a diagram showing a state in which a shift fork is arranged at a predetermined position with respect to a support member.

FIG. 4 is a view showing how a steel ball and a compression spring are inserted into a support member.

FIG. 5 is a diagram showing a state in which a steel ball and a compression spring are pushed into a recess of a support member by a pressing member.

FIG. 6 is a diagram showing a procedure for incorporating the shift rod into the support member.

FIG. 7 is a view showing a procedure for incorporating the shift rod into the support member.

FIG. 8 is a view showing a state in which a shift rod is assembled to a support member.

FIG. 9 is a perspective view showing a state where a shift system is substantially completed.

FIG. 10 is a plan view and a side view showing a state where the shift system is almost completed.

FIG. 11 is a view showing a conventional method of assembling a shift rod to a support member.

[Explanation of symbols]

 10 transmission 12 input shaft 14 output shaft 16 counter shaft 18 gear train system 20 shift system 22 case 24, 26, 28 shift rod 30 support member 32 main body part 34 detent part 36, 38, 40 shift fork 42 detent mechanism 44 compression spring 46 steel ball 50 pressing member 100 supporting member 102 fitting hole 104 shift rod 106 compression coil spring 108 ball 110 pressing member

Claims (2)

[Claims] 1. A fitting hole provided to support a shift rod at an end portion of the shift rod, the fitting hole being fitted to the end portion, and the detent member provided in the fitting hole. And elastically projecting from the inner peripheral surface of the fitting hole, thereby selectively engaging with a plurality of engaging portions formed along the longitudinal direction of the shift rod, In a shift rod support structure of a transmission having a detent member that defines a longitudinal position of the shift rod in a plurality of stages, a wall portion of the fitting hole on a side facing the detent member is provided in a longitudinal direction of the shift rod. A shift rod support structure for a transmission, characterized in that a predetermined amount is cut out along the shift rod support structure. 2. A fitting hole for supporting a shift rod, and a detent which is disposed in a recess formed in an inner wall of the fitting hole and is elastically biased in a direction projecting into the fitting hole. The shift rod is provided on a support member having a member and a notch formed in a wall portion of the fitting hole on a side facing the detent member over a predetermined length along an extension direction of the fitting hole. A method of assembling a shift rod to be mounted while being inserted into the fitting hole, wherein a pressing member for pressing the detent member is inserted into the fitting hole from the notch, and the pressing member A step of burying the detent member in the recess against the elastic force and retracting from the fitting hole; and inserting the shift rod into the fitting hole, and inserting a tip end portion of the shift rod into the pressing member. Work to contact the side If, while further inserting the shift rod in the fitting hole,
A step of integrally sliding the shift rod and the pressing member along the fitting hole and the cutout; and a step of retracting the pressing member from the fitting hole via the cutout portion. A method of assembling a shift rod, characterized by: