JP3224658B2 - Power transmission device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an HST, a driving industrial vehicle,
The present invention relates to a power transmission device such as a battery forklift.

[0002]

2. Description of the Related Art In a conventional power transmission device for transmitting the output torque of a power source such as an electric motor, a hydraulic motor, or an engine to a wheel, which is disposed laterally with respect to the front-rear direction of a vehicle, FIGS. As shown, the transfer housing is provided with bolts 10
1, a light hand transfer cover 103 fixed to one side of the housing body 102 via bolts 101, and a light hand transfer cover 103 fixed to the other side of the housing body 102 via bolts 104. And the left hand transfer cover 105.

An input shaft 107 which is spline-engaged with an output shaft 106 of a power source is connected to a housing main body 0.
2 and the light hand transfer cover 103 via bearings 108 fitted respectively.
A second gear 111 having a driven gear 110 that meshes with a gear 109 of the input shaft 107 includes a housing body 102 and a light hand transfer cover 10.
3 are supported by bearings 113 on a second shaft 112 respectively fitted to the second shaft 3.

The drive gear 11 of the second gear 111
The third shaft 116 having the driven gear 115 meshing with the fourth gear 4 is supported by bearings 117 fitted to the left hand transfer cover 105 and the right hand transfer cover 103, respectively. A differential case 121 for fixing a force gear 119 meshing with the drive gear 118 of the third shaft 116 via a bolt 120 is supported via bearings 122 fitted to the housing body 102 and the left hand transfer cover 105, respectively. .

The left and right axle shafts 123 connected via a differential device in the differential case 121 are inserted through common spindles 124 welded to the right hand transfer cover 103 and the left hand transfer cover 105, respectively. Ball bearing 1 fitted to the spindle 124
The wheel hub 126 is supported on 25.

[0006]

The structure of the above-mentioned prior art has the following problems. (1) Since the left and right bearing holes of each shaft are machined into different housings, and each housing is positioned with a knock pin and bolted together, it is difficult to obtain the accuracy of the position and coaxiality of the left and right bolt holes.

In addition, it is difficult to obtain the accuracy of the degree of position between the axes.
For example, in the output shaft 106, the bearing 108 includes the housing body 102 and the light hand transfer cover 10.
3, the second shaft 112 is supported by the housing body 102 and the light hand transfer cover 103, and the second shaft 112 is supported by the third shaft 116.
Is supported by the right hand transfer cover 103 and the left hand transfer cover 105, and the differential case 121 is supported by the left hand transfer cover 105 and the housing body 102.

As described above, since the bearings are arranged separately between the three housings, the position and coaxiality of the bearings are liable to be out of order, and the out of position and coaxiality are abnormal due to the out of gear engagement. However, problems such as a shortened life due to the occurrence of a preload on the bearing may occur. (2) The spindle 124 is mounted on each transfer cover 10
Since it is a structure protruding from 3 and 105, if it is going to be integrated with the transfer covers 103 and 105,
When turning the spindle 124, the spindle 1
The transfer covers 103, 10
Since the five parts must be integrally rotated, the transfer covers 103 and 105 are asymmetrical parts with respect to the rotation axis of the lathe, that is, the center axis of the spindle 124, and since these parts are large, it is necessary to perform lathing integrally. It is difficult. For this reason, the spindle 124 and the transfer covers 103 and 105 are separately formed, and it is necessary to perform welding after the lathe processing of the spindle 124. Must be cast steel,
Cast iron such as ductile cast iron, which is less expensive than cast steel, cannot be used as a material for the transfer covers 103 and 105 because of poor weldability.

As described above, there is a double disadvantage that a welding step is required and cast steel which is more expensive than cast iron must be used. (3) Since there are many housing divisions and coupling surfaces, the number of man-hours required for milling the flange surface, knock pin hole processing, bolt hole processing, and the like, and increasing the number of bolts themselves also have the problem of high cost. ing.

The present invention has been developed to address such a problem, and has as its object to facilitate machining and assembly of a housing.

[0011]

To achieve the above object, the present invention provides an output shaft of a power source and an output shaft of the power source.
The torque is transmitted via the differential device.
Power transmission device in which axle shafts are arranged parallel to each other
A location, integrally formed to cover the transfer housing bearing portion of the shaft of the transfer element for transmitting an output torque of the power source to the differential device and the support of the differential device are integrally molded, the axle shaft and the differential unit Wherein the transfer housing and the axle housing are connected by a plane parallel to the axle shaft.

Further, the present invention is characterized in that only the support of the differential device of the transfer housing is vertically divided and connected.

[0013]

According to the present invention, all the holes for supporting all the shafts and the support for supporting the differential device are provided in the transfer housing by the above means. At the same time, the axle housing is divided by the flange surface of the transfer housing, making it almost rotationally symmetrical with respect to the center line of the axle shaft. To process the tube portion.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 7. Reference numeral 1 denotes a power source case, and a transfer housing 3 fixed to the case 1 via bolts 2 is a power source. The bearing portion of the transmission element for transmitting the output torque of the source to the differential device and the support of the differential device are integrally formed.

More specifically, an input shaft 5 which is spline-engaged with the output shaft 4 of the power source case 1 is supported via a bearing 6 fitted to the transfer housing 3. The gear 7 of the input shaft 5
The second gear 9 having the driven gear 8 meshing with the second shaft 1 fitted to the transfer housing 3
It is supported by a bearing 11 on the zero.

A third shaft 14 having a driven gear 13 that meshes with a drive gear 12 of the second gear 9
It is supported by a bearing 15 fitted to the transfer housing 3. A differential case 19 for fixing a force gear 17 meshing with a drive gear 16 of the third shaft 14 via a bolt 18 includes a pair of support members 2 formed integrally with the transfer housing 3.
It is supported via bearings 21 fitted to 0,20.

An axle housing 27 that supports an axle shaft 26 to which power is transmitted through a differential device 25 including a spider 22, a pinion gear 23, and a side gear 24 in the differential case 19 has a surface 28 parallel to the axle shaft 26. The wheel hub 31 is supported on a ball bearing 30 fitted to the axle housing 27 by a bolt 29.

When the support 20 has a sufficient size between the two supports and the differential case 19 can be installed obliquely, the support 20 is integrally protruded from the transfer housing 3 as shown in FIG. If it is possible to form the support, but the dimensions between the two supports are not sufficient and the differential case 19 cannot be assembled, as shown in FIG. Bearing cap 2
Oa was fixed to the support 20 by bolts 32.

As described above, the differential case 19
The bearing or the shaft spigot portion of all the shafts including the above is fitted in the same transfer housing 3. Each of the gear shafts is incorporated into the transfer housing 3 by driving both side bearings 6 into the input shaft 5 and then through the spigot opening 3 a for fitting the output shaft 4, and the second gear 9 is driven into both the side bearings 11. Thereafter, the second shaft 10 is inserted into the transfer housing 3 through the opening 3b and moved to the position shown in the drawing. Then, the second shaft 10 is driven through the opening 3c, and the driven gear 13 is inserted into the position shown in the drawing from the opening 3b.

Thereafter, the third shaft 14 into which the bearing 15 is driven is also inserted through the spigot opening 3d, and after passing through the opening 3e, the third gear and the third shaft 14 are spline-fitted. Thereafter, the bearing 15 is driven into the spigot opening 3f. Further, the differential device 25 and the transfer housing 3 are mounted between the supports 20 as shown in FIG. 2 or FIG.

As described above, the transfer housing 3
The assembly can be completed as a sub-assembly incorporating all the components of the transfer gear train, and the transfer housing 3 incorporating all the components of the transfer gear train has a notch at the opening 3b on the circumference. The spigot shaft 3g and the spigot hole 27a opened in the axle housing 27 are fitted to the axle housing 27 by bolts 29 at a flange surface 28 parallel to the axle shaft 26, and the axle housing 27 is differentially connected to the left and right chewing portions 27b. The device cover 27c is formed integrally with a casting such as ductile cast iron, for example, and the transfer housing 3 is integrally formed with the casting including the support 20 as described above.

[0022]

As described above, according to the present invention, the power source
Output shaft and power source output torque are differential
The axle shaft transmitted through the device
In the power transmission apparatus disposed in a row, transmission element for transmitting an output torque of the power source to the differential device Shi
Since the bearing part of the shaft and the support of the differential device are formed as a single transfer housing, the accuracy of the position and coaxiality of each shaft is improved, and each bearing with abnormal noise when gears mesh. The axle shaft and the axle housing that covers the differential device were integrally formed, and this was connected to the transfer housing on a plane parallel to the axle shaft. Therefore, the divided surface of the entire housing can be reduced to two surfaces, and welding is not required for the connection, so that the entire housing can be manufactured from a castable material such as ductile cast iron having good workability, and the flange surface machining bolt hole can be manufactured. This has the effect that the number of steps during processing can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention.

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

FIG. 3 is another embodiment of the cross-sectional view taken along the line CC of FIG. 1;

FIG. 4 is an external plan view of FIG.

FIG. 5 is a side view showing the appearance of FIG. 4;

FIG. 6 is another side view of the appearance of FIG. 4;

FIG. 7 is an external front view of FIG.

FIG. 8 is a sectional view showing a conventional example.

FIG. 9 is an external plan view of FIG.

FIG. 10 is an external side view of FIG. 9;

[Explanation of symbols]

 3 Transfer Housing 6, 11, 15 Bearing 21 Support 25 Differential Device 26 Axle Shaft 27 Axle Housing 28 Parallel Surface

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-17747 (JP, A) JP-A-59-135207 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B60K 17/00-17/36 B60B 35/16 F16H 57/00-57/04

Claims (2)

(57) [Claims] An output shaft of a power source and an output shaft of the power source.
Is transmitted through the differential device.
A power transmission device in which a through shaft is arranged in parallel with each other
A is, the integral molding to cover the transfer housing and the support of the bearing part and the differential device shaft transmission element for transmitting an output torque of the power source to the differential device are integrally molded, the axle shaft and the differential unit A power transmission device comprising an axle housing, wherein the transfer housing and the axle housing are connected by a plane parallel to the axle shaft. 2. The power transmission device according to claim 1, wherein only a support of the differential device of the transfer housing is vertically divided and connected.