JPH11159601A - Structure of opening cover for transmission case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To apply a display with an upper/lower relation easily recognizable by a worker to a surface of a cover. SOLUTION: An opening for obtain rotational coupling with a power take-off device is provided in a side wall 6 of a transmission case 2. A cover 12 closing an opening is formed by a flange 12a overlapping and connecting to an outer surface of the side wall 6 and a box-shaped closing part protruded from the flange 12a via the opening to the inside of the transmission case 2. In a hollow part 8 of the closing part, a reinforcing rib is provided, a height of the reinforcing rib is changed, and a character or a code is displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opening for obtaining a rotational connection between a vehicle transmission and a power take-off device (PTO), and more particularly to a lid structure for closing the opening.

[0002]

2. Description of the Related Art As disclosed in Japanese Unexamined Patent Publication No. Hei 3-121937, a side wall of a transmission case of a freight vehicle is provided with an opening for obtaining rotational coupling with a power take-out device. When the power take-off device is not attached, the opening of the side wall of the transmission case is closed with a lid, the strength of the transmission case is secured, and the oil flow in which the gears are stirred inside the transmission case is rectified and agitated. I try to lower the resistance. Therefore, if the lid is mounted upside down, the function of lowering the oil stirring resistance is impaired.

The transmission case disclosed in Japanese Utility Model Laid-Open Publication No. 3-115249 has a structure for preventing erroneous assembling of a lid. It is difficult to apply a liquid packing or the like to the sealing surface, and if there is a portion where the liquid packing is not applied to the sealing surface, oil leakage may occur. If the bolt holes have different intervals, it is difficult to apply a uniform pressing load to the overlapping surface of the side wall and lid of the transmission case.
Oil leakage may occur.

On the other hand, it is conceivable to provide a display (mark) for distinguishing between upper and lower sides on the surface of the lid flange, but the area of the display which can be clearly recognized by avoiding the bolt insertion hole is too small. It is difficult to obtain a sufficiently large area for a raised display or a depressed display in order to prevent erroneous assembly, which makes it very difficult to see after painting. Also, the display of the lid flange can be distinguished from the top and bottom when viewed from the front side, but is not perfect because the top and bottom cannot be distinguished from the back side.

[0005]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to provide a structure of an opening lid of a transmission case, in which a display is provided on an outer surface of the lid so that an operator can easily recognize the vertical relationship. Is to do.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a transmission case having a side wall provided with an opening for obtaining a rotational connection with a power take-off device. Comprises a flange overlapped with and bonded to the outer surface of the side wall, and a box-shaped closing portion projecting from the flange through the opening to the inside of the transmission case. Characters or symbols are displayed by changing the height of the characters.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A lid for closing an opening in a side wall of a transmission case is provided so as not to wastefully increase the amount of oil inside the transmission case or disturb oil flow by gears. Is recessed from the side wall of the inside to match the arrangement of the gears. Further, reinforcing ribs are provided on the concave surface or the hollow portion to secure the strength. In the present invention, erroneous assembling of the lid is prevented by using the continuous top surface of the reinforcing rib of the lid to raise the letters “up and down”.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a transmission case 2 has a front end wall 3 and a rear end wall provided with a shaft hole 4 of a main shaft and a shaft hole 5 of an intermediate shaft which receive a rotational force of an engine through a clutch. Have. If a clutch is connected as is well known, the intermediate shaft is constantly rotated. The main shaft and the intermediate shaft support gears of each speed that mesh with each other. An opening 18 (see FIG. 3) is provided in the side wall 6 of the transmission case 2, through which a member for obtaining a rotational connection with the power take-off device passes, and the opening 18 is closed by the lid 12. The lid 12 is provided with a flange 12 a which is overlapped with the side wall 6 of the transmission case 2, and the flange 12 a is attached by screwing bolts inserted into eight bolt insertion holes 10 to the side wall 6.

As shown in FIG. 2, the lid 12 is a box-like member projecting from the opening 18 of the side wall 6 into the inside of the transmission case 2, and the box-like space 8 is reinforced by lattice-like reinforcing ribs. You. As shown in FIG. 3, the bottom wall or the closing portion 20 of the cavity 8 of the transmission case 2 has a curved surface corresponding to the gear inside the transmission case 2, whereby the transmission case 2
The agitation resistance of the oil inside is small, the volume of the transmission case 2 is minimized, and the rigidity of the side walls 6 is suppressed by the reinforcing ribs.

As shown in FIG. 4, according to the present invention, the lid 12
In order to prevent erroneous assembling, lattice-shaped reinforcing ribs 21 to 32 formed in the space 8 of the lid 12 are used to display the vertical relationship of the lid 12. That is,
Generally, the reinforcing ribs in the form of a lattice arranged in the concave portion or the hollow portion 8 are provided at the bottom of the hollow portion 8, that is, the closed portion 20.
2a, the top surface of each reinforcing rib, which indicates "up and down", is raised near the flange 12a and the other portions are lowered. is there.

As shown in FIGS. 4 to 6, with respect to the reinforcing ribs extending in the vertical direction, the reinforcing ribs 21 and 23 are made higher and the intermediate reinforcing rib 22 is made lower. Article 1 (1 from the top)
Regarding the third) reinforcing ribs extending in the lateral direction, the reinforcing ribs 26 extending leftward from the reinforcing ribs 21 are made higher, and the reinforcing ribs 25, 27 at both ends are made lower. The second and third lateral reinforcing ribs 28 and 29 are made high over the entire length. The fourth reinforcing ribs 31 and 32 in the horizontal direction are made low, and the reinforcing ribs 30 extending diagonally to the lower left from the intersection of the reinforcing ribs 29 and the reinforcing ribs 23 are made high. As a result, as shown in FIG. 2, the reinforcing ribs 2 are provided inside the hollow portion 8 surrounded by the flange 12a.
According to 1, 26, 28, 29, 23, and 30, the top surfaces of the reinforcing ribs that are continuous with each other display the characters “up and down”. Accordingly, the worker places the lid 12 on the transmission case 2
Can be assembled to the opening 18 of the side wall 6 without fail.

The display according to the present invention utilizes the reinforcing ribs formed outside the lid 12, that is, inside the space 8, and the top surface of the reinforcing ribs is configured to indicate "up and down". A very wide display surface can be obtained, and even if it is contaminated with oil or the like, it can be easily visually recognized.

[0013]

As described above, according to the present invention, in a transmission case provided with an opening on a side wall for obtaining a rotational connection with a power take-off device, a cover for closing the opening is overlapped and connected to an outer surface of the side wall. And a box-shaped closing portion projecting from the flange through the opening to the inside of the transmission case. A reinforcing rib is provided in an empty space of the closing portion, and the height of the reinforcing rib is changed to change a character or A sign is displayed, and the display surface is very wide, so that it can be easily recognized even if it is contaminated with oil or the like, and it is possible to prevent erroneous assembly upside down.

By providing the reinforcing ribs on the lid, the rigidity of the lid is increased, and the gear noise of the transmission can be suppressed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a schematic configuration of a transmission case provided with an opening lid according to the present invention.

FIG. 2 is a perspective view of a lid that closes an opening.

FIG. 3 is a front sectional view showing a main part of a transmission case.

FIG. 4 is a front view of the lid viewed from the back side.

FIG. 5 is a plan sectional view of the lid.

FIG. 6 is a side sectional view of the lid.

[Explanation of symbols]

2: Case 3: Front end wall 4: Shaft hole 5: Shaft hole 6: Side wall 8: Empty portion 10: Bolt insertion hole 12: Lid 12
a: Flange 18: Opening 20: Closed part 21-3
2: Reinforcing rib

Claims (2)

[Claims] 1. A transmission case provided with an opening in a side wall for obtaining a rotational connection with a power take-off device, wherein a lid for closing the opening is overlapped and connected to an outer surface of the side wall; A box-shaped closure that projects through the opening to the inside of the transmission case, a reinforcing rib is provided in an empty space of the closure, and the height of the reinforcing rib is changed to display characters or symbols. Of the opening lid of the transmission case. 2. An opening in a transmission case according to claim 1, wherein said reinforcing ribs comprise vertical and horizontal reinforcing ribs intersecting each other, and characters "up and down" are raised by a top end surface of said reinforcing ribs. Lid structure.