JP3174183B2 - Shift rod support structure for transmission and method of assembling the same - Google Patents

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 disposed on a support member for supporting a shift rod, and a method for assembling the same.

[0002]

2. Description of the Related Art In general, a transmission that shifts gears in response to the operation of a change lever has an input shaft connected to an engine via a clutch, and is rotatable coaxially with the input shaft independently of the input shaft. An output shaft on which a plurality of gears for shifting are arranged, and a plurality of gears meshing with the gears arranged on the output shaft, for transmitting the rotational force of the input shaft to the output shaft. A gear train system including a counter shaft, a synchronizing device disposed 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 synchronizing device, and various attached mechanisms And so on.

[0003] A transmission of this type which has a detent mechanism for positioning a shift rod in a neutral position and an operating position and giving a sense of movement during a shift operation is conventionally known. For example, as a structure of a conventional detent mechanism, as shown in FIG. 11, a fitting hole 102 is provided in a support 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 engagement grooves 104 each.
a, 104b, and 104c are formed, and a compression coil spring 10 is formed in a recess 100a formed in the support member 100.
6 and a ball 108, and the ball 108 is moved by the biasing force of the compression coil spring 106.
Are known in which the shift rod 104 is held at a predetermined operation position by engaging with an engagement groove of the same. Further, as an interlock mechanism for preventing simultaneous operation of a plurality of shift rods, for example, as shown in the back of Japanese Patent Application Laid-Open No. 2-8558, a support member for supporting a plurality of shift rods or a mechanism mounted between shift rods is provided. The member is provided with an interlock pin movable in a direction orthogonal to the shift rod, and when one shift rod moves to the operating position, the interlock pin is moved to a position for locking the other shift rod by the solenoid. The structure is known.

[0004]

By the way, in recent years, the technology of automatic assembling of automobiles has been extremely developed, and automatic assembling by transmission is also demanded in assembling a transmission. However, the conventional detent mechanism shown in FIG. 11 has a problem that the assembling method depends on human feeling, and is not suitable for automatic assembling.

Here, a method of assembling a conventional detent mechanism will be described. First, in FIG.
02 formed at a position opposing the ball No. 02
a, a pressing member 110 for pressing the ball 108
And the ball 108 is pressed against the urging force of the compression coil spring 106 so that the recess 1 formed on the side wall surface of the fitting hole 102 is inserted.
00a. In this state, the shift rod 104 is inserted into the fitting hole 102 as shown in FIG.
The tip of the shift rod 104 is
0 from the state in which the pressing member 110 is in contact with the side surface of arrow A.
As shown by, the shift rod 104 is pushed in the direction of the arrow B while being retracted out of the fitting hole 102, the shift rod 104 rides on the ball 108, and the shift rod 104 is inserted all the way into the fitting hole 102. It is to do. That is, in such an assembling method, it is difficult to retreat the pressing member 110 out of the fitting hole 102 and to push the shift rod 104, and depending on the timing, the shift rod 104 rides well on the ball 108. As a result, there was a problem that the assembly could fail.

Accordingly, the present invention has been made in view of the above-mentioned problem, and an object of the present invention is to provide a transmission in which a detent mechanism is disposed on a support 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]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems and to achieve the object, a shift rod supporting structure of a transmission according to the present invention is provided for supporting a shift rod at an end of the shift rod. A fitting hole fitted to the end portion, and a detent member provided in the fitting hole, wherein the detent member elastically protrudes from an 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 of the fitting hole 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 a shift rod of the present invention, a fitting hole for supporting the shift rod and a recess formed on an inner wall of the fitting hole, and projecting into the fitting hole are provided. A detent member elastically biased in the direction in which the mating hole faces the detent member,
A method of assembling a shift rod, wherein the shift rod is mounted on a support member having a notch formed over a predetermined length along an extending direction of the fitting hole while inserting the shift rod into the fitting hole. From the notch, a pressing member for pressing the detent member enters the fitting hole,
By the pressing member, a step of burying the detent member in the recess against the elastic force and retreating from the fitting hole, and inserting the shift rod into the fitting hole,
Contacting the tip of the shift rod with a side surface of the pressing member; and further inserting the shift rod into the fitting hole while connecting the shift rod and the pressing member to the fitting hole and the notch. And a step of retreating the pressing member from the inside of 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 the detent member is 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 becomes possible.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a view schematically showing 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,
An output shaft 14 arranged coaxially with the input shaft 12 so as to be rotatable independently of the input shaft 12 and having a plurality of gears for shifting, and a plurality of gears meshing with the gears arranged on the output shaft 14. 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 a synchronizing device disposed on the output shaft 14 or 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. And the transmission 10
As shown in FIG. 1, as shown in FIG. 1, a case 22 is put on an assembly combining the gear train system 18 and the shift system 20 to be assembled.

The shift rod support structure and the method for assembling the shift rod according to one embodiment are applied to the shift system 20 shown in FIG. Next, FIGS. 2 to 10 are views showing an assembling procedure of the shift system 20. FIG. 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, and 28 that are operated by a shift lever (not shown), and these three shift rods 24, 26, and 28 are provided.
Are supported by the support member 30. The support member 30
It comprises a main body 32 and a detent section 34 connected to the front of the main body 32 and in which a detent mechanism described later is arranged. The main body 32 has insertion holes 32a into which the shift rods 24, 26, and 28 are inserted, respectively.
32b and 32c are formed. Each of the shift rods 24, 26, 28 is provided with a shift fork 36, 38, 40, which engages with a sleeve of a synchronizer disposed in the gear train system 18 described above.

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

9 and 10, a detent portion 34 of the support member 30 has a U-shaped groove 34 with an open top.
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 foremost side in FIG. Detent mechanism 42
Are arranged below each of the U-shaped grooves 34a, 34b, 34c.
b, 34c, the structure of the detent mechanism 42
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 example.

In FIG. 10, a concave portion 34c1 protruding downward is formed on the lower surface of the U-shaped groove 34c. A steel ball 46 is formed in the concave portion 34c1 via a coil-shaped compression spring 44. Are located. The steel ball 46 is constantly urged by the urging force of the compression spring 44 in a direction in which the steel ball 46 protrudes 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, the steel ball 46 is moved by the compression spring 4.
4, the three concave portions 28a, 28b, 2
8c, the shift rod 28 is held at three sliding positions.

Next, the shift system 2 configured as described above
0 will be described with reference to FIGS. First, as shown in FIG. 2, the shift rods 24, 32b, 32c are inserted into the insertion holes 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, the first-speed and second-speed shift forks 40, 3
The fourth speed shift fork 38 and the fifth 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 on the bottom surface of the U-shaped groove 34c of the support member 30, and the steel ball 46 is inserted from above. Installing.

Next, as shown in FIGS. 5 (a) and 5 (b), the steel ball 46 is pressed into the recess 34c1 by a pressing member 50 having a conical recess 50a formed at the tip. 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 inserting the shift rod 28 into the insertion hole 40a of the shift fork 40, the distal end of the shift rod 28 is inserted into the U-shaped groove 34c1 as shown in FIG. 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 integrally slid in the direction of arrow C along the U-shaped groove 34c. At this time, the steel ball 46 is
The shift rod 28 is kept pressed down by
However, since it rides above the steel ball 46, the compression spring 44 and the steel ball 46 are securely pushed into the recess 34c1, and the shift rod 28 is moved through the state shown in FIG. The support member 30 is inserted up to the position shown in FIG. In the state shown in FIG. 6C, since the pressing member 50 is in contact with the main body 32 of the support member 30, it cannot slide 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 to 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. Is cut out (opened) along the longitudinal direction of the shift rod 28,
Compression spring 44 and steel ball 46 constituting detent mechanism 42
Is easily assembled.

Next, as shown in FIG.
The interlock pin 52 is inserted into the through hole 35c formed on the side wall of the hole c through the through holes 35a and 35b from the direction of the arrow E. By the action of the interlock pin 52, simultaneous operation of the two shift rods is prevented. Thus, the assembly of the shift rod 28 to the support member 30 is completed. The shift rod 24,
26 is also assembled to the support member 30 in the same procedure as the shift rod 28.

Such shift rods 28, 26, 24
9 is completed after assembling to the support member 30 is completed.
As shown in FIG. 7, the spring pins 58, 56, and 54 are inserted into the pin holes 40b, 38b, and 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, respectively. Shift fork 40,3
8 and 36 are fixed to the shift rods 28, 26 and 24. By the above assembling operation, FIG. 9, FIG.
As shown in (b), the shift system 20 is completed.

As described above, in this embodiment, the pressing member 50 is slidable integrally with the shift rods 24, 26, 28 so that the wall portion of the insertion hole facing the steel ball 46 can be slid. That is, the U-shaped grooves 34a, 34b, 34c
Is cut out (opened) along the longitudinal direction of the shift rods 24, 26, 28, so that the compression spring 44 and the steel ball 46 constituting the detent mechanism 42 can be easily assembled. , The shift system 20 can be automatically assembled.

The present invention can be applied to a modification or modification of the above embodiment without departing from the gist of the invention.

[0025]

As described above, according to the shift rod support structure and the method of assembling the same according to the present invention, the detent member is pressed by the pressing member and pressed while being retracted from the fitting hole. Since the member and the shift rod can be integrally slid 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 the drawings]

FIG. 1 is a view schematically showing an assembling procedure of a transmission to which a shift rod support structure and an assembling method of an embodiment are applied.

FIG. 2 is a view showing a state in which 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 diagram showing a state where 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 view showing a procedure for assembling a shift rod into a support member.

FIG. 7 is a diagram showing a procedure for assembling a shift rod into a support member.

FIG. 8 is a view showing a state where 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.

10A and 10B are a plan view and a side view showing a state where the shift system is substantially completed.

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

[Explanation of symbols]

 DESCRIPTION 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 support member 102 fitting hole 104 shift rod 106 compression coil spring 108 ball 110 pressing member

Claims (2)

(57) [Claims] 1. A fitting hole which is provided for supporting a shift rod at an end of the shift rod, the fitting hole being fitted to the end, and a detent member provided in the fitting hole. The shift rod is formed by elastically protruding from an inner peripheral surface of the fitting hole to selectively engage with a plurality of engaging portions formed along a longitudinal direction of the shift rod. A shift rod support structure for a transmission having a detent member that defines the position in the longitudinal direction of the shift rod in a plurality of stages, wherein a wall portion of the fitting hole on the side facing the detent member extends in the longitudinal direction of the shift rod. A shift rod support structure for a transmission, wherein the shift rod support structure is cut off along a predetermined distance. 2. A fitting hole for supporting a shift rod, and a detent disposed in a recess formed in an inner wall of the fitting hole and elastically biased in a direction protruding into the fitting hole. A support member having a member and a cutout formed over a predetermined length along a direction in which the fitting hole extends in a wall portion of the fitting hole facing the detent member; A method of assembling a shift rod to be mounted while inserting the fitting rod into the fitting hole, wherein a pressing member for pressing the detent member enters the fitting hole from the notch portion, and the pressing member A step of burying the detent member in the recess against the elastic force and retreating from the fitting hole; inserting the shift rod into the fitting hole; 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 notch; and a step of retracting the pressing member from the inside of the fitting hole via the notch. A method of assembling a shift rod.