JP2729946B2 - Transmission for vehicles - Google Patents

Description

The present invention relates to a vehicular transmission, and more particularly to a vehicular transmission capable of fixing a reverse idler gear shaft compactly and firmly without incurring disadvantages such as installation space and weight. The present invention relates to a vehicular transmission that can maintain the meshing accuracy of each gear.

[Conventional technology]

In a vehicle transmission, especially a manual vehicle transmission,
For example, a main shaft reverse gear that meshes when the vehicle is driven backward while having a first speed gear to a fifth speed gear and a first speed gear to a fifth speed gear that are meshed when the vehicle travels forward. Some have a counter shaft reverse gear and a reverse idler gear. The transmission switches to a desired shift state by selecting and engaging each of these gears.

In order to prevent the reverse idler gear meshing with the main shaft reverse gear and the counter shaft reverse gear in the reverse state of such a transmission, there is one disclosed in Japanese Patent Publication No. 61-39537. Japanese Patent Publication No. Sho 62-19621 discloses an improved switchability between a main shaft reverse gear, a counter shaft reverse gear, and a reverse idler gear.

[Problems to be solved by the invention]

By the way, the reverse idler gear meshing with the main shaft reverse gear and the counter shaft reverse gear in the reverse state of the transmission is supported by the reverse idler gear shaft. FIGS. 4 and 5 show a method of fixing the reverse idler gear shaft to the transmission case. FIG. 4 shows the reverse idler gear shaft 46 having one end fixed to the transmission case 4. In FIG. 5, both ends of the reverse idler gear shaft 46 are fixed to the transmission cases 4 and 6, respectively.

However, the one end side fixing type shown in FIG. 4 is disadvantageous in strength because a bending force is generated in the reverse idler gear shaft 46 when a load due to meshing of the gears acts on the reverse idler gear shaft 46. However, there is a disadvantage that it cannot be firmly fixed. Further, since the mesh point of the gear fluctuates, there is a disadvantage that the strength of the gear is disadvantageous.

On the other hand, the both-end fixing method shown in FIG. 5 can be fixed firmly with sufficient rigidity to avoid disadvantages in strength of the one-end fixing method. However, when the counter shaft fifth speed gear 32 is disposed close to the counter shaft reverse gear 36, the end-side fixed type is used to avoid interference with the counter shaft fifth speed gear 32. The center distance between the counter shaft 12 and the reverse idler gear shaft 46 must be large. As a result, the outer diameter of the reverse idler gear 38 has to be increased, which is disadvantageous in terms of installation space and weight.

[Object of the invention]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vehicular transmission capable of compactly and firmly fixing a reverse idler gear shaft without incurring disadvantages such as installation space and weight, and ensuring engagement accuracy of each gear. It is in.

[Means for solving the problem]

In order to achieve this object, the present invention relates to a vehicle transmission provided with a reverse idler gear meshing with a main shaft reverse gear and a counter shaft reverse gear, respectively. A holding member for holding both end sides of the first holding member, the holding member including a first holding portion and a second holding portion facing in parallel, and a communication portion connecting the first holding portion and the second holding portion; A first holding hole and a second holding hole for holding both ends of the reverse idler gear shaft are formed in the first holding portion and the second holding portion, respectively, and an insertion hole for inserting a fixing bolt is formed in the connecting portion. And provided
The transmission case is provided with a positioning hole in which one end of a reverse idler gear shaft is fitted at a proper position where a reverse idler gear properly meshes with the main shaft reverse gear and the counter shaft reverse gear. A screw hole for screwing a fixing bolt is formed in the case, and the fixing bolt is inserted into the insertion hole of the connecting portion by aligning the first holding hole of the first holding portion with the positioning hole of the transmission case. Is fixedly mounted on the transmission case by screwing into a screw hole of the transmission case and tightening the first and second holding portions so as to mesh with the main shaft reverse gear and the counter shaft reverse gear. The reverse idler gear shaft hole of the reverse idler gear disposed between the first holding portion and the first holding hole and the second holding portion of the second holding portion. A reverse idler gear shaft was fitted and fixed in the holding hole and the positioning hole of the transmission case to fix the holder at a proper position where the respective reverse gears of the transmission case properly mesh. It is characterized by the following.

[Action]

According to the configuration of the present invention, a holding body for holding both ends of the reverse idler gear shaft that supports the reverse idler gear is provided, and the connecting portion of the holding body is fixed to the transmission case with the fixing bolt and the first holding is performed. Part and second
One end of the reverse idler gear holding both ends in the holding part is fitted and fixed in the positioning hole of the transmission case, and the reverse idler gear shaft is fixed by both ends fixed method, so sufficient rigidity Accordingly, the reverse idler gear shaft can be held, and disadvantages in strength can be avoided.

Also, by fitting one end of the reverse idler gear shaft holding both ends to the first holding portion and the second holding portion of the holding body into the positioning holes of the transmission case,
By providing the holding member at a proper position where the respective reverse gears of the transmission case are properly meshed, the reverse idler gear shaft can be positioned and fixed at the proper position.

Further, interference with a countershaft fifth-speed gear disposed close to the countershaft reverse gear is caused, as in a conventional both-end fixing method in which both ends of a reverse idler gear shaft are fixed to respective transmission cases. In addition, the center distance between the counter shaft and the reverse idler gear shaft does not increase.

Furthermore, in the case of the conventional both-end fixing method in which both ends are fixed to each transmission case, the clearance in the thrust direction of the reverse idler gear that is supported is unstable due to the length of the reverse idler gear shaft. The reverse idler gear is disposed between the first holding portion and the second holding portion, which are opposed to each other in parallel with each other, and is supported by the reverse idler gear shaft. The clearance in the thrust direction of the idler gear can be stabilized, and the lubricating oil is stored by utilizing the space surrounded by the connecting portion between the first holding portion and the second holding portion which are opposed to each other in parallel with the holding member. Can be.

〔Example〕

Next, an embodiment of the present invention will be described in detail with reference to the drawings.

1 to 3 show an embodiment of the present invention.
In the figure, reference numeral 2 denotes, for example, a vehicle transmission, and 4 denotes a transmission first.
A case, 6 is a transmission second case, 8 is an input shaft, 10 is a main shaft, and 12 is a counter shaft.

In the transmission first case 4 and the transmission second case 6 of the transmission 2, an input shaft 8 and a main shaft
10 and a counter shaft 12 are supported. The driving force of an internal combustion engine (not shown) is input from the input shaft 8 to the main shaft 10. The main shaft 10 is rotatably supported with main shaft first speed gears to fifth speed gears 14 to 22, respectively. Counter shafts 1st gear to 5th gears 24 to 32 are fixed to the counter shaft 12 which is supported in parallel with the main shaft 10. When a vehicle (not shown) is driven to travel forward, the main shafts 1st to 5th gears 14 to 22 of the main shaft 10 and the counter shaft
The transmission 2 is switched to a desired shift state by selectively meshing the twelve counter shaft first-speed gears through fifth-speed gears 24-32.

A main shaft reverse gear 34 is fixed to the main shaft 10, and a counter shaft reverse gear 36 is fixed to the counter shaft 12. A reverse idler gear 38 meshes with the main shaft reverse gear 34 and the counter shaft reverse gear 36. The main shaft reverse gear 34 has a main shaft reverse gear shaft portion 34a fixed to the main shaft 10, and a main shaft reverse gear tooth slidably provided in the main shaft reverse gear shaft portion 34a in the axial direction. Part 34b. The main shaft reverse gear tooth portion 34b is slid with respect to the main shaft reverse gear shaft portion 34a by the reverse gear shift fork 44 of the reverse gear shift shaft 42 reciprocated by the shift lever 40. As a result, the main shaft reverse gear 34 becomes the reverse idler gear 38
Is engaged / disengaged, and the shift state is changed to the reverse state.
The state is switched to the non-reverse state.

A reverse idler gear 38 meshing with the main shaft reverse gear 34 and the counter shaft reverse gear 36 is supported by a reverse idler gear shaft 46.

The reverse idler gear shaft 46 is held at both ends by holders 48. The holding body 48 includes a first holding unit 50 and a second holding unit 52 having a semi-circular shape and facing in parallel with each other.
A semi-cylindrical connecting portion 54 connecting the first and second holding portions 50 and 52 is provided. As a result, the holding body 48 is
As shown in FIG. 3, first and second semi-disc-shaped
A space surrounded by the semi-cylindrical connecting portion 54 is formed between the second holding portions 50 and 52. The first and second holding units
A reverse idler gear 38 is provided in a space surrounded below by a communication portion 54 between 50 and 52. First and second holding units
A first holding hole 56 and a second holding hole 58 for holding the reverse idler gear shaft 46 are formed in 50 and 52, respectively. Have been.

Further, the transmission first case 4 has a proper position where the reverse idler gear 38 properly meshes with the main shaft reverse gear 34 and the counter shaft reverse gear 36,
One end of the reverse idler gear shaft 46 is fitted to form a positioning hole 64.

Reference numeral 66 denotes a screw hole into which the fixing bolt 60 is screwed, reference numeral 68 denotes a fixing hole formed in the second holding portion 52, reference numeral 70 denotes a fixing hole formed on the other end side of the reverse idler gear shaft 46, and reference numeral 72 denotes a spring. The pin is a fixed pin.

 Next, the operation will be described.

To fix the reverse idler gear shaft 46, first, the first holding hole 56 of the first holding portion 50 is
The fixing bolt 60 inserted into the insertion hole 62 of the connecting portion 54 is screwed into the screw hole 66 of the transmission first case 4 and tightened, and the holding body 48 is fixed to the transmission first case 4. Fix it.

A reverse idler gear 38 is arranged between the first holding portion 50 and the second holding portion 52 of the fixed holding body 48 facing in parallel so as to mesh with the main shaft reverse gear 34 and the counter shaft reverse gear 36. The reverse idler gear shaft hole 74 of the reverse idler gear 38 and the holder 48
The reverse idler gear shaft 46 is fitted into the first holding hole 56 and the second holding hole 58 formed in the first and second holding portions 50 and 52 and the positioning hole 64 of the transmission first case 4 respectively.

Then, the fixing pin 72 is fitted in the fixing hole 68 of the second holding portion 52 and the fixing hole 70 on the other end side of the reverse idler gear shaft 46 to fix the reverse idler gear shaft 46.

As described above, the vehicular transmission 2 is provided with the holding members 48 that hold both ends of the reverse idler gear shaft 46 that supports the reverse idler gear 38, and the communication portion 54 of the holding member 48 is connected to the transmission first transmission. One end of the reverse idler gear shaft 46 fixed to the case 4 with the fixing bolts 60 and having both ends held by the first holding portion 50 and the second holding portion 52 is fitted into the positioning hole 64 of the first case 4 of the transmission. Since the reverse idler gear shaft 46 is fixed by the fixing method at both ends, the reverse idler gear shaft 46 can be held with sufficient rigidity, and disadvantages in strength can be avoided.

Therefore, the reverse idler gear shaft 46 can be firmly fixed to the first case 4 of the transmission, and the bending of the reverse idler gear shaft 46 can be prevented. Variation of the mesh point can be prevented, and each of the reverse gears 34, 36, 38 can be made advantageous in strength.

Also, one end of the reverse idler gear shaft 46 having both ends held by the first holding portion 50 and the second holding portion 52 of the holding body 48 is fitted into the positioning hole 64 of the first case 4 of the transmission, and held. The body 48 is connected to each reverse gear 34 of the first case 4 of the transmission.
The reverse idler gear shaft 46 can be positioned and fixed at an appropriate position by being fixedly provided by a fixing bolt 60 at an appropriate position where the 36 and 38 are properly engaged.

Therefore, the respective reverse gears 34, 36, 38 can be properly meshed, and the meshing accuracy of the respective reverse gears 34, 36, 38 can be ensured.

Further, as shown in FIG. 5, both ends of the conventional reverse idler gear shaft 46 are fixed to the transmission cases 4 and 6, respectively, and are disposed close to the counter shaft reverse gear 36, as in the case of both ends fixed. Counter shaft 5th gear
The interference with the counter shaft 32 does not occur, and the axial distance between the counter shaft 12 and the reverse idler gear shaft 46 does not increase.

Therefore, the reverse idler gear 38 can be made compact without increasing the outer diameter thereof and without causing disadvantages such as installation space and weight.

Further, the both-end fixing method of fixing both ends of the reverse idler gear shaft 46 to each of the conventional transmission cases 4 and 6 shown in FIG. 5 is performed by increasing the length of the reverse idler gear shaft 46. gear
There is a problem that the clearance in the thrust direction of 38 becomes unstable and a thrust washer or the like is required. However, in this vehicle transmission 2, the reverse idler gear 38 is disposed between the first holding portion 50 and the second holding portion 52 facing the holding body 48 in parallel, and is supported by the reverse idler gear shaft 46. Thereby, the clearance in the thrust direction of the reverse idler gear 38 can be stabilized, and a thrust washer or the like can be eliminated.

In addition, lubricating oil can be stored using the space surrounded by the communication portion 54 between the first holding portion 50 and the second holding portion 52 facing the holding member 48 in parallel, and the reverse gear Lubrication can be improved by lubricating 34, 36 and 38.

〔The invention's effect〕

As described above, according to the present invention, the holding member that holds both ends of the reverse idler gear shaft that supports the reverse idler gear is provided, and the connecting portion of the holding member is fixed to the transmission case with the fixing bolt, One end of the reverse idler gear shaft holding both ends in the first holding portion and the second holding portion, respectively, is fitted and fixed in the positioning hole of the transmission case, and the reverse idler gear shaft is fixed by the both end side fixing method. As a result, the reverse idler gear shaft can be held with sufficient rigidity, and disadvantages in strength can be avoided.

For this reason, the reverse idler gear shaft can be firmly fixed to the transmission case, the bending of the reverse idler gear shaft can be prevented, and the bending can prevent the meshing point of each reverse gear from changing. Each reverse gear can be advantageous in strength.

Also, one end of a reverse idler gear shaft having both ends held by the first holding portion and the second holding portion of the holding member is fitted into a positioning hole of the transmission case, and the holding member is connected to each reverse of the transmission case. The reverse idler gear shaft can be positioned and fixed at a proper position by being fixedly provided by a fixing bolt at a proper position where the gear properly meshes.

Therefore, the respective reverse gears can be properly meshed, and the meshing accuracy of the respective reverse gears can be secured.

Further, interference with a countershaft fifth-speed gear disposed close to the countershaft reverse gear is caused, as in a conventional both-end fixing method in which both ends of a reverse idler gear shaft are fixed to respective transmission cases. In addition, the center distance between the counter shaft and the reverse idler gear shaft does not increase.

Therefore, the reverse idler gear can be made compact without increasing the outer diameter thereof and without inviting disadvantages such as installation space and weight.

Furthermore, a reverse idler gear is arranged between the first holding portion and the second holding portion that are opposed to each other in parallel to the holding body, and is axially supported on the reverse idler gear shaft, so that the clearance of the reverse idler gear in the thrust direction is stabilized. It is possible to eliminate the need for a thrust washer or the like, and to store the lubricating oil by utilizing a space surrounded by a connecting portion between the first holding portion and the second holding portion which are opposed to each other in parallel with each other. The lubricating oil can lubricate each reverse gear to improve lubricity.

[Brief description of the drawings]

1 to 3 show an embodiment of the present invention. FIG. 1 is a sectional view of a vehicular transmission, FIG. 2 is an end view taken along the line II-II of FIG. 1, and FIG. It is a part enlarged sectional view. 4 and 5 are sectional views of a reverse idler gear shaft portion of a transmission showing a conventional example. In the figure, 2 is a vehicle transmission, 4 is a first transmission case, 6 is a second transmission case, 10 is a main shaft, 12 is a counter shaft, 34 is a main shaft reverse gear,
36 is a counter shaft reverse gear, 38 is a reverse idler gear, 46 is a reverse idler gear shaft, 48 is a holder, 50 is a first holder, 52 is a second holder, 54 is a communication unit,
56 is a first holding hole, 58 is a second holding hole, 60 is a fixing bolt, 64
Is a positioning hole.

Claims (1)

(57) [Claims] 1. A vehicular transmission in which reverse idler gears meshing with a main shaft reverse gear and a counter shaft reverse gear, respectively, are supported on a reverse idler gear shaft, and both ends of the reverse idler gear shaft are held. A holding body is provided, and the holding body includes a first holding section and a second holding section opposed in parallel, and a communication section connecting the first holding section and the second holding section, and the first holding section and the second holding section. A first holding hole and a second holding hole for holding both ends of the reverse idler gear shaft are formed and provided in the holding portion, and an insertion hole for inserting a fixing bolt is formed and provided in the connecting portion. The reverse case is located in the proper position where the reverse idler gear properly meshes with the main shaft reverse gear and counter shaft reverse gear. Provided by forming a positioning hole to which one end side of the Ragiyashafuto is fitted, provided by forming a screw hole to be screwed fixing bolts to the transmission case, the first
The holding body is aligned with the positioning hole of the transmission case by aligning the first holding hole of the holding part with the positioning hole of the transmission case, and the fixing bolt inserted into the insertion hole of the communication part is screwed into the screw hole of the transmission case to be tightened. And a reverse idler gear shaft hole of the reverse idler gear disposed between the first holding portion and the second holding portion so as to mesh with the main shaft reverse gear and the counter shaft reverse gear. The reverse idler gear shaft is fitted and fixed in the first holding hole and the second holding hole of the second holding portion and the positioning hole of the transmission case, so that each of the reverse gears of the transmission case is properly adjusted. A transmission for a vehicle, wherein the transmission is fixedly provided at an appropriate position for meshing with the transmission.