JP2591672Y2 - Gear cover mounting structure for transmission - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission in which a transmission mechanism is housed in a cylindrical case formed by joining and fastening a plurality of cylindrical case divided bodies, and more particularly to lubrication of a transmission gear. The present invention relates to a gear cover mounting structure provided for the purpose of, for example, reducing stirring resistance when stirring oil.

[0002]

2. Description of the Related Art Conventionally, as a transmission in which a transmission mechanism is housed in a cylindrical case formed by joining and fastening a plurality of such cylindrical case divided bodies, for example, FIG.
(See Japanese Utility Model Laid-Open No. 4-54351). That is, in FIG. 5, a main shaft 2 extending parallel to the longitudinal direction of the case 1 (that is, an axial direction) and a counter shaft 3 disposed below the main shaft 2 are provided inside the cylindrical case 1. . Further, the case 1 is composed of a front case 1a and a rear case 1 in the axial direction.
The two cases 1a and 1b are joined together and fastened and fixed by bolts 4.

The counter shaft 3 is provided with a counter splitter gear 5, a counter drive gear 6, a counter gear 7 and the like as a speed change gear in the axial direction, and the counter splitter gear 5 is provided in a front case 1a. 6 is a front case 1a and a rear case 1
The counter gear 7 is disposed in the rear case 1b, and the counter gear 7 is disposed in the case 1 opposite to the joint surface S with the b.

[0004] Also, from the inner peripheral surface under the rear case 1b,
A partition plate 8 as a weir extending up to a vicinity of the tooth tip of the counter gear 7 and extending a predetermined length in the circumferential direction of the rear case 1b is erected to divide the lubricating oil accumulated in the lower part of the cylindrical case 1 back and forth. Then, the lubricating oil is prevented from moving in the axial direction.

[0005]

However, in such a conventional transmission, a large amount of lubricating oil is filled in the cylindrical case 1 so that the transmission gears 5, 6, 7 and the like can be sufficiently lubricated. If it is inserted (for example, lubricating oil
When the lubricating oil is inserted beyond the axis of the transmission gear), the stirring resistance when stirring the lubricating oil of the transmission gears 5, 6, 7 and the like increases, leading to an increase in the oil temperature and a decrease in the synchronization performance of the synchro. Was.

Conversely, when a small amount of lubricating oil is introduced into the cylindrical case 1 to such an extent that the transmission gears 5, 6, 7 and the like can be lubricated (for example, lubricating oil is introduced up to the axis of the counter shaft 3). In particular, when the front portion of the vehicle is raised and the vehicle is inclined, such as when the vehicle is traveling uphill, the lubricating oil in the cylindrical case 1 in front of the partition plate 8 moves toward the partition plate 8 and is biased. In particular, there is a fear that the counter splitter gear 5, bearings and the like at the front of the front case 1a cannot be sufficiently lubricated.

In view of the above problems, in a transmission employing the above-described cylindrical case 1, in the transmission employing the cylindrical case 1,
It has been considered to attach a gear cover to the front case 1a to prevent the axial movement of the lubricating oil therein. However, when the gear cover is simply attached to the front case 1a, there are the following problems.

That is, in the transmission employing the cylindrical case 1, the front case 1a is placed upward, and the main shaft ASSY16, the countershaft 3, and the main drive gear ASSY17 are set, suspended, and assembled from the top. Therefore, if the gear cover is first attached to the front case 1a (see FIG. 7), the gear cover hinders the assembly of the shafts, so that there is a disadvantage that the assembly becomes impossible.

When the lower end of the gear cover is bolted to the bottom of the front case 1a, a gap between the lower end of the gear cover and the bottom of the front case 1a is increased.
As shown in the figure, a small space for bolting cannot be secured, and bolting cannot be adopted. The present invention focuses on such a conventional problem, and in a transmission in which a transmission mechanism is housed in a cylindrical case formed by joining and fastening a plurality of cylindrical case divided bodies, It is an object of the present invention to improve the mounting structure of a gear cover provided to reduce stirring resistance when stirring lubricating oil of a transmission gear, and to solve the above-mentioned conventional problems.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, according to the present invention, a transmission mechanism is housed in a cylindrical case formed by joining and fastening a plurality of cylindrical case divided bodies. A gear cover mounting structure for preventing the movement of lubricating oil in the cylindrical case in the axial direction, wherein one of a plurality of case divided bodies is provided on both sides of the gear cover covering a lower portion of the transmission gear. A fixed attachment piece fixedly attached by a fixture is provided on an attachment portion formed on the inner peripheral surface of the divided body, and at the lower end of the gear cover, at the joint surface of the one case divided body with another case divided body. A clamping attachment piece to be clamped and fixed is provided, and at the time of assembling the transmission mechanism into the one case split body, the fixed attachment piece of the gear cover is attached to the one case while the gear cover is covered with the transmission gear. By sandwiching the mounting portion of the divisions fixed mounting vital clamping attachment piece at the time of bonding the fastening of both cases split bodies mutually bonded surfaces of both casing divided bodies each other, and configured to mount the gear cover.

[0011]

In this configuration, when the gear cover is mounted, the shafts are assembled while temporarily covering the transmission gear of the countershaft with one hand, and after the shafts are assembled, the fixed mounting piece of the gear cover is attached to the case divided body. The gear cover is fixedly mounted on the mounting portion, and the holding cover is held between the joint surfaces of the two case split bodies when the two case split bodies are joined and fastened.

When the gear cover is attached in this manner, when a small amount of lubricating oil is put into the cylindrical case to the extent that the transmission gears and the like can be lubricated, the front portion of the vehicle, particularly when the vehicle is traveling uphill, is used. When the vehicle is tilted higher, a part of the lubricating oil in the case is blocked by the gear cover and remains in the case ahead of the gear cover.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of a gear cover mounting structure for a transmission according to the present invention. In this figure, the same reference numerals are given to the same members as those in the above-described conventional example. In FIG. 1, a main shaft 2 extending parallel to a longitudinal direction (that is, an axial direction) of the case 1 and a counter shaft 3 disposed below the main shaft 2 are provided inside the cylindrical case 1. Further, the case 1 is divided into a front case 1a and a rear case 1b as a case division body in the axial direction, and the two cases 1a and 1b are joined to each other and fastened and fixed by bolts 4.

The counter shaft 3 is provided with a counter splitter gear 5, a counter drive gear 6, a counter gear 7 and the like as a speed change gear in the axial direction, and the counter splitter gear 5 is provided in the front case 1a. 6 is a front case 1a and a rear case 1
The counter gear 7 is disposed in the rear case 1b, and the counter gear 7 is disposed in the case 1 opposite to the joint surface S with the b.

Also, from the inner peripheral surface at the lower part of the rear case 1b,
A partition plate 8 as a weir extending up to a vicinity of the tooth tip of the counter gear 7 and extending a predetermined length in the circumferential direction of the rear case 1b is erected to divide the lubricating oil accumulated in the lower part of the cylindrical case 1 back and forth. Then, the lubricating oil is prevented from moving in the axial direction. Such a configuration is similar to that of the above-described conventional example. Further, in the present embodiment, the counter drive gear 6
A gear cover is provided to cover the lower front surface and the outer peripheral surface and to prevent the movement of the lubricating oil in the axial direction. That is, as shown in FIGS. 2 to 4, the gear cover 10 has a predetermined gap between the bow-shaped partitioning plate 11 facing the front side surface of the lower portion of the counter drive gear 6 with a predetermined gap and the tooth tip of the counter drive gear 6. It has a substantially U-shaped peripheral plate 12 that covers the outer peripheral surface of the counter drive gear 6 and is in close contact with the bow-shaped partition plate 11. Further, the bow-shaped partition plate 11 is extended to the vicinity of the inner peripheral surface of the front case 1a, and a sealing member 11a made of rubber or the like is protruded from the peripheral end thereof to be closely contacted with the inner peripheral surface of the front case 1a. You. Therefore, this bow-shaped partition plate 1
Numeral 1 functions as a weir for preventing the lubricating oil accumulated in the front case 1a from moving in the axial direction.

The gear cover 10 is provided with a gear cover 10.
In order to attach to the front case 1a, both ends of the substantially U-shaped peripheral plate 12 protrude above the arcuate partition plate 11, and fixed mounting pieces 13 are provided at both ends. A holding attachment piece 14 extending downward is provided. When the gear cover 10 is put on the lower part of the counter drive gear 6, the holding attachment piece 14 can be held between the joint surfaces S between the front case 1a and the rear case 1b.

In FIG. 2, the corner 12a at the upper left end of the peripheral plate 12 of the gear cover 10 is bent inward (ie, toward the axis of the countershaft 3) to form a lubricating oil diffusion plate 12a. That is, in FIG. 2, when the counter drive gear 6 is driven clockwise in FIG. 2, a part of the lubricating oil that is scraped up by the counter drive gear 6 and hits the diffusion plate 12a is put into the front case 1a. It works like spreading.

On the other hand, two mounting portions 15 protruding substantially toward the center of the counter drive gear 6 are provided on the inner peripheral surface of the lower part of the front case 1a and separated from each other (see FIG. 5). In such a configuration, in order to attach the gear cover 10, the gear cover 10 is attached to the counter drive gear 6.
After temporarily assembling the shafts with one hand, after the shafts are assembled, as shown in FIG. 5, the fixed mounting piece 13 of the gear cover 10 is fixedly mounted on the mounting portion 15 of the front case 1a, and the holding mounting piece is fixed. 14 when the front case 1a and the rear case 1b are joined and fastened to each other.
The gear cover 10 is attached so as to be held between the joint surfaces S of a and 1b.

When a predetermined amount of lubricating oil is put into the cover 1 and the counter drive gear 6 is driven, the lubricating oil in the rear case 1b is swept up by the counter drive gear 6 and hits the diffusion plate 12a of the gear cover 10. Further, part of the lubricating oil that has hit the diffusion plate 12a can diffuse and move into the front case 1a beyond the arcuate partition plate 11. For this reason, even if the lubricating oil in the front case 1a decreases, the lubricating oil is removed from the rear case 1b by driving the counter drive gear 6.
Can be automatically refilled.

In the above embodiment, the transmission gears 5, 6,
When a small amount of lubricating oil is put into the cylindrical case 1 to such an extent that the lubricating oil 7 can lubricate (for example, when the lubricating oil is put up to the axis of the counter shaft 3), especially when the vehicle is traveling uphill. When the front of a new vehicle is raised and the vehicle leans,
The lubricating oil in the front case 1a moves toward the partition plate 8 and tends to be deflected, but a part of the lubricating oil is blocked by the gear cover 10 and the front case 1 is located forward of the gear cover 10.
a. For this reason, the counter splitter gear 5 and the like at the front of the front case 1a can be sufficiently lubricated.

Further, when a small amount of lubricating oil is put into the cylindrical case 1 within a range where the transmission gears 5, 6, 7 and the like can be lubricated, the lubricating oil of the transmission gears 5, 6, 7 and the like are stirred. Since the stirring resistance at the time is reduced, it is possible to suppress an increase in the oil temperature and improve the synchronization performance of the synchro. According to such a configuration, after the shafts are assembled, the position of the fixed mounting piece 13 is on the outer peripheral side of the shafts, so that the fixed mounting piece 13 can be easily mounted.
Can be fixedly attached to the attachment portion 15. Further, since the sandwiching mounting piece 14 is sandwiched and attached to the joint surface S between the two cases 1a and 1b when the front case 1a and the rear case 1b are joined and fastened, the lower end side of the gear cover 10 can be easily attached.

That is, when the lower end of the gear cover is to be bolted to the bottom of the front case 1a, a stay having a complicated shape is provided or the shape of the case bottom is changed.
It is necessary to significantly change the joint surface between the cases to provide a space for bolting.
When the front case 1a and the rear case 1b are joined and fastened to each other, they are clamped and attached to the joint surface S between the two cases 1a and 1b, and it is not necessary to take the above-described measures.

[0023]

As described above, according to the present invention, when a small amount of lubricating oil is put in the cylindrical case 1 to the extent that the transmission gears and the like can be lubricated, especially when the vehicle is traveling uphill. When the front portion of the vehicle is raised and the vehicle is tilted, part of the lubricating oil in the cylindrical case is blocked by the gear cover and remains in the cylindrical case in front of the gear cover.
The transmission gears and the like arranged at the front of the cylindrical case can be sufficiently lubricated.

Further, when a small amount of lubricating oil is put in the cylindrical case to the extent that the transmission gears can be lubricated, the stirring resistance when stirring the lubricating oil of the transmission gears is reduced, and the rise in oil temperature is suppressed. In addition, the synchronization performance of the synchro can be improved. Further, at the time of assembling the transmission mechanism in the case split body, the fixed mounting piece of the gear cover is fixedly mounted on the mounting portion of the case split body while the gear cover is put on the transmission gear, and the holding mounting piece is connected to the two case split bodies. Since the gear cover is attached so as to be sandwiched between the two case divided bodies at the time of joining and fastening with each other, the gear cover can be attached easily and without adopting a complicated structure.

[Brief description of the drawings]

FIG. 1 is a cross-sectional configuration diagram showing an embodiment of a gear cover mounting structure of a transmission according to the present invention.

FIG. 2 is a front view of a gear cover of the transmission shown in FIG.

FIG. 3 is a view taken along line AA of FIG.

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

FIG. 5 is a view of the front case viewed from a joint surface side.

FIG. 6 is a cross-sectional configuration diagram of a conventional transmission.

FIG. 7 is a sectional view illustrating a method of assembling a conventional transmission mechanism.

8 is a view taken in the direction of arrow C in FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylindrical case 1a Front case 1b Rear case 6 Counter drive gear 10 Gear cover 13 Fixed mounting piece 14 Nipping mounting piece 15 Mounting part S Joining surface

Continuation of the front page (56) References JP-A-5-71616 (JP, A) JP-A-1-197194 (JP, A) JP-A-50-144983 (JP, A) Japanese Utility Model Laid-Open 4-127450 (JP) , U) Japanese Utility Model Application Hei 4-54351 (JP, U) Japanese Utility Model Application Hei 2-62157 (JP, U) Japanese Utility Model Application Showa 62-93456 (JP, U) Japanese Utility Model Application Showa 57-155355 (JP, U) (58) Field surveyed (Int.Cl. ⁶ , DB name) F16H 57/02 F16H 57/04

Claims (1)

(57) [Scope of request for utility model registration] 1. A transmission in which a transmission mechanism is housed in a cylindrical case formed by joining and fastening a plurality of cylindrical case divided bodies, wherein an axial direction of lubricating oil in the cylindrical case is defined. A gear cover mounting structure for preventing movement, which is fixed to a mounting portion formed on an inner peripheral surface of one of the plurality of case divided bodies on both sides of a gear cover covering a lower portion of the transmission gear by a fixing tool. In addition to providing a fixed mounting piece to be mounted, a lower mounting portion of the gear cover is provided with a holding mounting piece that is held and fixed to a joining surface of the one case split body with another case split body, and into the one case split body. At the time of assembling the speed change mechanism, the fixed mounting piece of the gear cover is fixedly mounted on the mounting portion of the one case split body while the gear cover is covered with the transmission gear, and the holding mounting piece is connected to the two case split body phases. A gear cover mounting structure for a transmission, wherein a gear cover is mounted so as to be sandwiched between joint surfaces of the two case split bodies at the time of joining and fastening each other.