JP2715362B2 - Axle housing mounting structure for power transmission device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission for transmitting power to driving wheels from an engine mounted on a frame of a body of a cargo handling vehicle such as a forklift truck via a transmission, a propeller shaft, a differential device, and left and right drive shafts. The present invention relates to a structure for mounting an axle housing for accommodating the differential device to a frame of a vehicle body.

[0002]

2. Description of the Related Art Conventionally, in a forklift truck cargo handling vehicle, as shown in FIG. 1, as a power transmission device, a transmission 3 fixed to an engine 2 provided on a frame 1 of a vehicle body, and an output shaft 3a of the transmission 3 are provided. , A differential device 5 that connects the input shaft 5 a to the propeller shaft 4, and a left and right drive device that connects one to the left and right of the differential device 5 and the other to the left and right drive wheels 6. The drive shaft 7 includes a transmission 3, a propeller shaft 4, a differential device 5, left and right drive shafts 7 from the engine 2.
The power is transmitted to.

[0003] In the power transmission device configured as described above, the differential device 5 is accommodated and the left and right drive shafts 7 are mounted.
As shown in FIG. 2, the axle housing 8 for rotatably holding the axle housing 8 is attached to the frame 1 of the vehicle body by integrally forming the axle bracket 9 on the outer periphery of the left and right drive shaft tube portions 8a of the axle housing 8. The axle bracket 9 is fixed to the body frame 1 with bolts.

As shown in FIG. 3, when the transmission 3 and the axle housing 8 are integrally fixed to the engine 2 in a backbone type, as shown in FIG. A supporting arm 10 having the outer periphery of the shaft tube portion 8a fixed to the frame 1 of the vehicle body is held rotatably in the circumferential direction of the drive shaft tube portion 8a and slidably in the left-right direction.

[0005]

In the conventional mounting of the axle housing on the frame of the vehicle body, in the former case, the alignment of the output shaft of the transmission, the propeller shaft and the input shaft of the differential gear is particularly important. Here, if the core is misaligned, problems such as vibration and noise occur. Therefore, when the axle bracket of the axle housing accommodating the differential device and the frame of the vehicle body are fixed by bolts so that the misalignment does not occur, the axle bracket and the vehicle body are fixed in order to make the fixing position accurate. It is necessary to improve the processing accuracy of the through hole and the bolt hole in the frame, and it is necessary to perform the adjustment work. Also, when the axle bracket is formed integrally with the axle housing, the left and right directions of the axle bracket must be accurate with respect to the frame of the vehicle body. For this reason, work is troublesome, workability deteriorates,
There was a problem that the cost at the time of work increased.

In the latter case, since the engine, the transmission and the axle housing are integrally fixed to each other, the positional relationship must be accurately determined in the work of assembling the vehicle body with the frame. However, there is a problem that the work becomes large and difficult, and the workability also deteriorates. An object of the present invention is to solve these problems.

[0007]

According to the present invention, there is provided a support arm in which right and left drive shaft tubes of an axle housing for accommodating a differential gear are fixed to a frame of a vehicle body. It is held rotatably and slidably in the left-right direction, and the input shaft tube portion of the axle housing is fitted in a fitting hole formed in a cross member fixed to the frame of the vehicle body in the left-right direction.

[0008]

According to the present invention, the axle housing can be arranged at a predetermined position when the axle housing is mounted on the frame of the vehicle body, and the input shaft of the differential device housed in the axle housing and the output shaft of the transmission or The misalignment with the propeller shaft can be easily prevented.

[0009]

[Embodiment] One embodiment of an axle housing mounting structure of a power transmission device according to the present invention is shown in FIGS.
This will be described with reference to FIG. The axle housing 28 that accommodates the differential 25 includes a main body 28a that covers the differential 25, and a propeller shaft 24 is attached to an output shaft 23a of the transmission 23 at the rear of the main body 28a.
An input shaft tube portion 28b for rotatably holding an input shaft 25a of a differential device 25 connected via a shaft is provided, and left and right drive shafts 27 connected to left and right drive wheels 26 are rotated on the left and right sides of the main body portion 28a. Left and right drive shaft tube portions 28 that freely hold
c is provided.

On the other hand, a frame 21 serving as a body of the vehicle body
Are left and right main bodies 21a facing each other and
And a main body 2 on the left and right sides thereof.
The left and right support arms 30 in the form of plates facing forward are fixed to the inside of the front of 1a. Each of the left and right support arms 30 faces forward from the portion fixed to the frame 21, bends inward once, and then bends forward again, and has a front end portion around the outer periphery of the drive shaft tube portion 28 c of the axle housing 28. To form a semicircular cut portion 30a having substantially the same inner diameter as that of the cut portion 30a. And
A semi-ring shaped cap body 31 having substantially the same inner diameter as the outer periphery of the drive shaft tube portion 28c of the axle housing 28 can be fixed to the front end of the support arm 30 by bolts, facing the cut portion 30a. ing.

A left and right plate-shaped cross member 32 is fixedly mounted on the left and right support arms 30 and is located at a predetermined position in the center of the cross member 32 on the left and right sides and is the same as the outer periphery of the input shaft tube 28b of the axle housing 28. A fitting hole 33 having an inner diameter is formed.

The left and right main bodies 2 of the frame 21
1a, engine support brackets 34 for supporting the engine 22 are provided inside the front and rear centers, respectively.
Support brackets 35 for supporting the transmission 23 fixed to the engine 22 are provided at predetermined positions on the left and right sides of the rear surface of the cross member 32, respectively.
The position where the support bracket 35 is fixed to the cross member 32 is such that the center of the output shaft 23a of the transmission 23 and the center of the fitting hole 33 of the cross member 32 are the same when the transmission 23 is fixed. The position is based on the fitting hole 33.

The axle housing 28 is attached to the frame 21 by cutting the left and right drive shaft tube portions 28c of the axle housing 28 at the front end of the support arm 30 and the cap body 31. And the input shaft tube 28b of the axle housing 28 is fitted into the fitting hole 33 of the cross member 32, while being rotatable in the circumferential direction of the drive shaft tube 28c and slidable in the left-right direction. To match.

With this configuration, when the axle housing 28 is mounted on the frame 21 side, the input shaft tube 28b of the axle housing 28 is
By fitting into the fitting hole 33 of the cross member 32 on the side, the center of the input shaft 25a of the differential device 25 held by the input shaft tube portion 28b is positioned at a required position, that is, the fitting of the cross member 32 is performed. It can be easily arranged at the center position of the hole 33. The transmission 23 is also fixed to the support bracket 35 via the mount member 36 so that the center of the output shaft 23a of the transmission 23 is positioned at a required position, that is, the fitting hole 3 of the cross member 32.
3 can be easily arranged at the center position. Accordingly, misalignment between the output shaft 23a of the transmission 23, the propeller shaft 24, and the input shaft 25a of the differential device 25 can be prevented, and the work can be easily performed.

In this embodiment, the fitting hole 33 of the cross member 32 is formed by directly processing the cross member 32. However, as shown in FIG.
The fitting hole 33 may be formed by forming a semicircular portion 37 on the upper part of the second member 2 and fixing a semi-ring body 38 having a semicircular portion 38a facing the semicircular portion 37 with a bolt. .
Further, a configuration may be adopted in which a ring-shaped elastic body is interposed in the fitting hole 33 or the hole formed by the cut portion 30a of the support arm 30 and the cap body 31. Further, the supporting arm 30 also has a bent portion in the present embodiment, but may have a configuration of a linear flat plate or the like without having a bent portion, and an arbitrary shape can be considered. .

[0016]

According to the present invention, when the axle housing is mounted on the frame of the vehicle body, the input shaft tube of the axle housing is fitted into the fitting hole of the cross member, so that the axle housing is accommodated in the axle housing. The input shaft of the differential device can be arranged at a predetermined position, and it is not necessary to perform advanced machining work and adjustment work as in the past, and the work can be performed easily, thereby improving workability and reducing costs. Reduction can be achieved. Also, the transmission can be arranged at a predetermined position by the support bracket, and misalignment between the transmission, the propeller shaft, and the differential can be easily prevented.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a conventional power transmission device.

FIG. 2 is an exploded perspective view illustrating an attached state of the axle housing in FIG.

FIG. 3 is a configuration diagram of another conventional power transmission device.

FIG. 4 is an exploded perspective view illustrating an attached state of the axle housing in FIG. 3;

FIG. 5 is a configuration diagram of a power transmission device of the present invention.

FIG. 6 is an exploded perspective view illustrating an attached state of an axle housing according to the present invention.

FIG. 7 is a top view of FIG. 6;

FIG. 8 is an explanatory view of another cross member according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Frame, 2 ... Engine, 3 ... Transmission, 3a ... Output shaft, 4 ... Propeller shaft, 5 ... Differential device, 5a ... Input shaft, 6 ... Drive wheel, 7 ... Drive shaft, 8 ... Axle housing, 8a ... Drive shaft tube part, 9 ... axle bracket, 10 ... support arm, 21 ... frame, 21a
... Main body, 21b ... Connected body, 22 ... Engine, 23 ... Transmission, 23a ... Output shaft, 24 ... Propeller shaft, 25 ... Differential device, 25a ... Input shaft, 26 ... Drive wheel, 27 ... Drive shaft, 28 ... Axle Housing, 28a
... Main body part, 28b ... Input shaft tube part, 28c ... Drive shaft tube part
DESCRIPTION OF SYMBOLS 30 ... Support arm, 30a ... Cut part, 31 ... Cap body, 32 ... Cross member, 33 ... Fitting hole part, 34 ... Engine support bracket, 35 ... Support bracket, 36 ...
Mounting member, 37: semicircular portion, 38: semi-ring body, 38
a ... Semicircle part.

Claims (2)

(57) [Claims] 1. An engine 2 provided on a frame 21 of a vehicle body.
2 transmission 23, propeller shaft 2
4. Drive wheel 26 via differential device 25 and left and right drive shafts 27
A left and right drive shaft tube portions 28c of an axle housing 28 accommodating the differential device 25 are respectively connected to a frame 21 of a vehicle body.
The supporting arm 30 fixed to the drive shaft tube portion 28c
A fitting hole 33 formed in a cross member 32 fixed to the frame 21 of the vehicle body to the left and right while holding the input shaft tube portion 28b of the axle housing 28 in the circumferential direction and slidably in the left and right directions. A mounting structure for an axle housing of a power transmission device, wherein the axle housing is fitted to the power transmission device. 2. In the cross member 32, the transmission 23 is located at a predetermined position with respect to the fitting hole 33.
The mounting structure for an axle housing of a power transmission device according to claim 1, wherein a support bracket (35) for attaching the axle housing is fixed.