JPH11210877A - Shifting device for manual transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make an assembling property for a bracket excellent, to reduce working manday, and to attain downsizing. SOLUTION: A reverse shift arm 43 is swung to a reverse direction by operating a shift head 35 fixed to a 5th shift position-reverse fork shaft 32 to the reverse direction, and an astern position is established by shifting a reverse idler gear to a reverse meshing position by the arm 43. Both end parts of a reverse shift arm bracket 42 are insertedly supported by the first and second reamer bolts 40, 41 fixed to a transmission case in a direction orthogonal to the fork shaft 32. The reverse shift arm 43 is supported by the first reamer bolt 40, and a 5th shift position shift arm 47 is supported by the second reamer bolt 41, freely to be oscillated respectively. One end part of the arm 47 is engaged with a 5th shift position shaft attached with a 5th shift position shift fork 48, and the other end part is engaged with the shift head 35.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shift device for a manual transmission, and more particularly to a structure for mounting a reverse shift arm bracket for a five-speed transmission.

[0002]

2. Description of the Related Art Conventionally, a shift pattern of a 5-speed transmission has a shift pattern of 1st, 2nd, 3rd and 4th, 5th and reverse.
Are generally arranged on the same shift line. As a fifth speed-reverse switching mechanism of such a five-speed transmission, for example, one disclosed in Japanese Utility Model Laid-Open No. 7-35854 is known. That is, the reverse shift head and the fifth speed shift fork are fixed to the fifth speed-reverse fork shaft. When the shift head is shifted in the reverse direction, the reverse shift arm engaged with one end of the shift head is moved in the reverse direction. Rocks. Since the reverse shift arm holds both surfaces of the reverse idler gear, the reverse idler gear is shifted to the reverse meshing position by swinging of the reverse shift arm, and the reverse gear can be established. Conversely, when the shift head is shifted in the fifth speed direction, the fifth speed shift fork fixed to the fork shaft shifts the fifth speed shift sleeve, and switches the speed to the fifth speed. At this time, the reverse shift arm also attempts to swing in the fifth speed direction, but the swinging of the reverse shift arm in the fifth speed direction is restricted by the one-way mechanism.

[0003] The one-side movement mechanism of the reverse shift arm is constructed as follows. That is, the reverse shift arm is swingably supported by a bracket fixed to the inner surface of the transmission case, and the bracket has an arc-shaped long hole. The tip of the shift head is engaged with a pin movably provided in an elongated hole provided in the middle of the reverse shift arm. The slot of the reverse shift arm is shorter than the slot of the bracket, and the pin is engaged with the slot of the reverse shift arm and the slot of the bracket at the same time. Therefore, when the shift head moves in the reverse direction, the reverse shift arm swings in the reverse direction via the pin. Conversely, when the shift head is operated in the fifth speed direction, only the pin moves and the reverse shift arm hits the inner surface of the case and does not move while stopped.

[0004]

One end of a bracket constituting the above-mentioned one-movement mechanism is bent into an L-shape, and this bent portion is fixed to a transmission case with bolts.
An insertion hole is formed in the bent portion in order to prevent interference with a fork shaft for the third speed, the fourth speed, and the fifth speed-R.

As described above, conventionally, fork shafts,
Since all parts such as the bracket were assembled to the transmission case, there was a disadvantage that the workability of the assembly was poor. In addition, brackets (including a reverse shift head and a five-speed shift fork) must be attached to the transmission case before assembling the fork shaft, which not only imposes restrictions on the order of assembling, but also reduces maintenance.

Further, in the conventional case, since the bracket is bent, the number of processing steps is increased and the size of the bracket is increased, and the bracket must be bolted in a narrow space on the inner surface of the case. However, there is a disadvantage that the number increases.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a shift device for a manual transmission in which the reverse shift arm bracket has good assemblability, reduces the number of processing steps and the number of steps, and reduces the size.

[0008]

In order to achieve the above object, the present invention provides a speed change mechanism in which a fifth speed stage and a reverse speed stage are arranged on the same operation line. By operating the fixed shift head in the reverse direction, the reverse shift arm engaged with the shift head swings in the reverse direction, and the reverse shift arm shifts the reverse idler gear to the reverse meshing position, thereby causing the reverse gear to move backward. In the manual transmission, a reverse shift arm bracket is provided substantially parallel to the fork shaft, and both ends of the reverse shift arm bracket are fixed to a transmission case in a direction orthogonal to the fork shaft. The reverse shift arm is inserted and supported by first and second reamer bolts. The fifth speed shift arm is swingably supported by the second reamer bolt, and one end of the fifth speed shift arm is engaged with an engaging portion of the fifth speed shaft to which the fifth speed shift fork is attached. The other end is engaged with the shift head, and the reverse shift arm bracket is brought into contact with the engagement portion of the fifth speed shift arm and the fifth speed shaft and the step portion of the second reamer bolt. It is characterized in that it is positioned in the thickness direction.

The first and second reamer bolts for swingably supporting the reverse shift arm and the fifth speed shift arm are inserted into both ends of a reverse shift arm bracket (hereinafter, referred to as a bracket). Are positioned in the vertical and vertical directions. That is, since the reamer bolt is also used for swinging support of the reverse shift arm and the fifth speed shift arm and mounting the bracket, the number of parts can be reduced and the bracket can be downsized. Since both ends of the bracket are supported by the reamer bolts, the bracket may have a flat plate shape, which eliminates the need for a conventional bending process and does not require bolting to the case.

[0010] As a method of positioning the bracket in the thickness direction, the bracket is positioned by the contact between the fifth speed shift arm and the engaging portion of the fifth speed shaft and the step portion of the second reamer bolt. It becomes unnecessary. Therefore, the bracket can be stably supported in three directions of up and down, front and rear, and left and right without fastening the bracket to the transmission case with bolts or the like.

Meanwhile, there is a fifth-speed transmission in which a fifth-speed transmission gear, which is the highest-speed stage, is disposed substantially at the center of a transmission case. In this case, the reverse switching mechanism and the five-speed switching mechanism are disposed at relatively close positions, and the reverse shift head for switching the reverse gear and the fifth-speed shift fork are fixed to one fork shaft. It is possible to On the other hand, when the fifth-speed transmission gear is disposed outside the transmission case, the reverse switching mechanism and the fifth-speed switching mechanism are disposed at positions separated in the axial direction, and the reverse shift head is provided. It is difficult to fix the shift fork and the five-speed shift fork to one fork shaft.

Therefore, in the present invention, a 5-speed shaft is provided separately from the 5-speed reverse fork shaft, and the 5-speed shift fork is fixed to the 5-speed shaft. In this case, a 5-speed shift arm is swingably attached to the transmission case, one end of the 5-speed shift arm is engaged with the 5-speed shaft, and the other end is engaged with the shift head.
The fifth speed shift fork can be shifted.
In the transmission having such a configuration, the fifth-speed transmission gear can be disposed outside the transmission case. Therefore, main components such as the transmission case and the transmission gear are replaced with the fourth-speed transmission and the fifth-speed transmission. It can be shared with the transmission.

[0013]

FIG. 1 shows an FR type five-speed transmission which is an example of a manual transmission according to the present invention. In this transmission, the front-rear direction refers to the vehicle front-rear direction, and the left-right direction refers to the vehicle width direction. This transmission includes an input shaft 1 and an output shaft 2 arranged coaxially, and a sub shaft 3 arranged in parallel with the shafts 1 and 2. The input shaft 1 is connected to an engine output shaft 5 via a clutch 4.

A reduction gear 6 is formed integrally with the input shaft 1, and a reduction gear 7 that always meshes with the reduction gear 6 is formed integrally with a front end of the sub shaft 3. The sub shaft 3 has a third-speed drive gear 8, a second-speed drive gear 9, a first-speed drive gear 1
A 0, reverse drive gear 11 is integrally formed, and a fifth speed drive gear 12 is rotatably supported at an end protruding rearward from the transmission case 22. This fifth speed drive gear 12 is
The speed change synchronizing device 13 is connected to the sub shaft 3. A third-speed driven gear 1 meshing with a third-speed drive gear 8 on the output shaft 2
A second-speed driven gear 15 meshing with the fourth-speed driving gear 9 and a first-speed driven gear 16 meshing with the first-speed driving gear 10 are rotatably arranged. 3-4 between input shaft 1 and output shaft 2
A speed switching synchronizing device 17 is provided. When the synchronizing device 17 is switched to the left side in FIG. A 1-2 speed switching synchronizer 18 is provided on the output shaft 2, and when the synchronizer 18 is switched to the left side in FIG. 1, the second speed is set, and when the synchronizer 18 is switched to the right side, the first speed is set.
Further, a reverse driven gear 18a is formed integrally with the shift sleeve of the 1-2 speed switching synchronizer 18,
The gear 18a can mesh with the reverse drive gear 11 via the reverse idler gear 19. Output shaft 2
A fifth-speed driven gear 20 that meshes with the fifth-speed drive gear 12 is fixed to an end protruding rearward from the transmission case 22.

The clutch 4 is a clutch housing 21
The transmission mechanism excluding the fifth-speed transmission gears 12 and 20 is accommodated in a transmission case 22. The fifth speed transmission gears 12 and 20 are housed in an end cover 23 mounted on the rear end of the transmission case 22.

Next, the speed change operation mechanism will be described with reference to FIGS. An upper cover 24 is mounted on the upper end of the transmission case 22.
Three fork shafts 30 to 32 are arranged in parallel and slidably on a pair of bearing portions 24a and 24b protruding from the lower surface of the fork shaft. The fork shaft 30 is for 1-2 speed switching, and a 1-2 speed shift fork 33 integrated with the fork head is fixed to the shaft 30. The fork shaft 31 is for 3-4 speed switching, and a 3-4 speed shift fork 34 integral with the fork head is fixed to the shaft 31. Further, the fork shaft 32 is for the fifth speed-reverse, and the shift head 35 is fixed to the shaft 32. The shift forks 33, 34, 35 are provided with grooves, and the inner lever 36 can be selectively engaged with these grooves (see FIGS. 2 and 4). Change lever (not shown)
Is operated in the select direction, the inner lever 36 is engaged with the groove of any of the shift forks 33, 34, 35.
When the change lever is operated in the shift direction, the inner lever 36 is shifted to the selected shift forks 33, 3.
4, 35 can be shifted.

As shown in FIG. 2, two reamer bolts 40, 41 are fastened to the transmission case 22 in a direction perpendicular to the fork shafts 30 to 32. 42 are supported at the front and rear ends. The first reamer bolt 40 swingably supports the upper end of the reverse shift arm 43, and a spring 4 for urging the reverse shift arm 43 in the reverse direction is provided on the outer periphery of the reamer bolt 40.
4 are wound. Normally, the reverse shift arm 43 is connected to the stopper pin 4 attached to the bracket 42.
In the position 5, the vehicle stops at the neutral position.

The shift head 35 is integrally provided with an arm 35a extending obliquely downward, and has a groove 3 at its tip.
5b is formed, and the groove 35b is engaged with the pin 46. The pin 46 is a slot 4 of the reverse shift arm 43.
3a and the slot 42a of the bracket 42 (see FIG. 3). The lower end of the reverse shift arm 43 is formed in a forked shape, and the forked portion is connected to the reverse idler gear 1.
9 on both sides. When the shift head 35 moves in the reverse direction, the reverse shift arm 43 swings in the reverse direction via the pin 46 to shift the reverse idler gear 19 to the reverse meshing position, thereby establishing the reverse gear. The pin 46, the long hole 43a of the reverse shift arm 43, and the long hole 42a of the bracket 42
Thus, the one-side movement mechanism of the reverse shift arm 43 only in the reverse direction is configured. The operation of the one-movement mechanism is the same as that of the conventional one, so that the description is omitted.

The second reamer bolt 41 supports a central portion of the fifth speed shift arm 47 so as to be swingable. An upper end of the fifth-speed shift arm 47 is engaged with a groove 35c provided in the shift head 35, and a lower end of the fifth-speed shaft 48 is slidably provided in the transmission case 22 in the front-rear direction. (Engaging portion) 48a. The engagement portion of the fifth speed shaft 48 may be a hole instead of the groove 48a, or may be a projection. This 5-speed shaft 48
A fifth-speed shift fork 49 for operating a shift sleeve of the fifth-speed switching synchronizer 13 is attached to an end of the transmission case 22 protruding outside. Therefore, when the shift head 35 shifts in the fifth speed direction, the fifth speed shaft 48 can be shifted in the fifth speed direction via the fifth speed shift arm 47, and the fifth speed switching synchronizer 13 can be switched to the fifth speed position.

As shown in FIG. 5, the right side of the lower end of the fifth speed shift arm 47 abuts against the bottom of the groove 48a of the fifth speed shaft 48, whereby the bracket 42 is positioned rightward and leftward. Is regulated by the step portion 41a of the second reamer bolt 41 via the sleeve 50,
The movement of the bracket 42 in the left-right direction is restricted.

In order to assemble the speed change operation mechanism having the above structure, the following operations are performed. First, the bracket 42 is attached to the transmission case 22 with the reamer bolts 40 and 41. At this time, the reverse shift arm 43, the fifth speed shift arm 47, and the like are also attached. And
Connect the reverse shift arm 43 to the reverse idler gear 19
And the lower end of the fifth-speed shift arm 47 is engaged with the groove 48 a of the fifth-speed shaft 48.

An upper cover 24 is mounted on the transmission case 22 from above. The upper cover 24 has an inner lever 36 and three fork shafts 30 in advance.
The shift forks 33 and 34 and the shift head 35 are fixed to the shafts 30 to 32. The upper cover 24 is attached to the transmission case 22
When mounted on the upper end of the shift fork 33 for 1-2 speed
And the 3-4 speed shift fork 34 are 1-2
Speed switching synchronizer 18 and 3-4 speed switching synchronizer 1
7 is engaged. Then, the arm 35 of the shift head 35
The assembling is completed when the groove 35b of a engages with the pin 46 and the groove 35c of the shift head 35 engages with the upper end of the fifth-speed shift arm 47.

As described above, the bracket 42 (including the reverse shift arm 43 and the fifth speed shift arm 47) is assembled to the transmission case 22, and separately from this, the fork shafts 30 to 32 (shift (Including the forks 33, 34 and 35), and the assembly is completed by combining them.
The workability of assembly is improved, and the maintainability is also improved.

In the above embodiment, the transmission for the fifth speed has been described. However, this transmission can be easily changed to the transmission for the fourth speed while sharing the main components such as the transmission case 22. Conversely, the four-speed transmission can be changed to a five-speed transmission while sharing the main parts. That is, by simply removing the fifth-speed drive gear 12 on the sub shaft 3 and the fifth-speed driven gear 20 on the output shaft 2 and removing the fifth-speed switching synchronizer 13 from the sub-shaft 3, it is easy to use the fourth-speed gear. Can be changed to a transmission. In this case, the fifth-speed shift arm 47, the fifth-speed shaft 48, and the fifth-speed shift fork 49 become unnecessary, but there is no problem even if the fifth-speed shift arm 47 and the fifth-speed shaft 48 are not removed.

In the above-described embodiment, an example in which the fifth speed gear is provided outside the transmission case has been described. However, the present invention can be applied to a case where the fifth speed gear is disposed inside the transmission case. In short, the present invention is desirably applied to a transmission in which the reverse switching mechanism and the five-speed switching mechanism are provided at separate positions. Needless to say, the present invention can be applied to not only the FR type transmission but also the FF type transmission.

[0026]

As apparent from the above description, according to the present invention, the first and second ends of the bracket disposed substantially parallel to the fork shaft are fixed to the transmission case.
The first reamer bolt supports the reverse shift arm so that it can swing freely, and the second reamer bolt supports the fifth speed shift arm so that it can swing. Therefore, the two reamer bolts are attached to the bracket. And swing support of the reverse shift arm and the 5-speed shift arm. Therefore, unlike the conventional case, it is not necessary to bend the bracket into an L-shape and fasten with a bolt, so that the bracket can be formed in a flat plate shape, and the bracket can be reduced in size and simplified, and the assembling property is improved. One end of the 5-speed shift arm is attached to a 5-speed shift fork.
The shift shaft is engaged with the engaging portion and the other end is engaged with the shift head. Therefore, even if the reverse switching mechanism and the fifth speed switching mechanism are separated from each other, switching can be easily performed by one shift head. Can control. Further, since the bracket is positioned in the plate thickness direction by the contact between the fifth speed shift arm and the engaging portion of the fifth speed shaft and the step portion of the second reamer bolt, no special positioning means is required. Therefore, the bracket can be stably supported in three directions of up and down, front and rear, and left and right without fastening the bracket to the transmission case with bolts or the like.

[Brief description of the drawings]

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

FIG. 2 is a plan view of a transmission mechanism of the transmission of FIG. 1;

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a sectional view taken along line BB of FIG. 2;

FIG. 5 is a sectional view taken along line CC of FIG. 2;

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

[Explanation of symbols]

12, 20 5th speed gear 13 5th speed switching synchronizer 19 reverse idler gear 22 transmission case 24 upper cover 32 5th speed-reverse fork shaft 35 shift head 40 first reamer bolt 41 second reamer bolt 41a step 42 reverse shift arm Bracket (bracket) 43 Reverse shift arm 46 Pin 47 5 speed shift arm 48 5 speed shaft 48a Groove (engagement part) 49 5 speed shift fork

Claims (1)

[Claims] 1. A shift head having a speed change mechanism in which a fifth speed stage and a reverse speed stage are arranged on the same operation line, and operating a shift head fixed to a fifth speed-reverse fork shaft in a reverse direction to thereby shift the shift head. The reverse shift arm engaged with the fork shaft swings in the reverse direction, and the reverse shift arm shifts the reverse idler gear to the reverse meshing position, thereby establishing the reverse gear. A reverse shift arm bracket is disposed in parallel, and both ends of the reverse shift arm bracket are inserted into and supported by a transmission case by first and second reamer bolts fixed in a direction orthogonal to the fork shaft. Swivelly supported by the first reamer bolt, 5-speed shift The fifth arm is pivotally supported by a second reamer bolt. One end of the fifth speed shift arm is engaged with an engagement portion of a fifth speed shaft to which a fifth speed shift fork is attached, and the other end is connected to the shift head. The reverse shift arm bracket is positioned in the thickness direction by abutment between the fifth speed shift arm and the engagement portion of the fifth speed shaft and the step of the second reamer bolt. Manual transmission shift device.