JP3181545B2 - Rear axle arrangement structure for industrial vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear axle arrangement structure for an industrial vehicle such as a construction vehicle having a bucket device mounted on a front portion thereof.

[0002]

2. Description of the Related Art Conventionally, this type of rear axle arrangement structure has a structure as shown in FIGS. 6 to 8, for example. That is, in the rear axle 60, supports 61 are provided on the front and rear surfaces of the central portion thereof so as to be relatively rotatable,
The support 61 has a plurality of vertical bolt insertion holes 62 formed at both ends in the left-right direction.

The vehicle body (frame) 70 includes a pair of left and right side frame portions 71, a plurality of upper and lower front frame portions 72 provided between the front portions of the side frame portions 71, and a rear lower surface of the side frame portion 71. Rear frame part 73 provided in
A rear end frame portion 74 provided between the rear end surfaces of the side frame portions 71, a connecting plate portion 75 provided between intermediate members of the side frame portion 71, a connecting plate portion 75 and the rear end frame portion 7.
4 and a connecting mold member 76 provided between the side frame portions 71 and the like.

A recess 77 is formed in an intermediate portion of the side frame 71 so as to allow the rear axle 60 to be fitted from below. At both front and rear sides of the two concave portions 77, mounting plate bodies 78 are respectively arranged inward from the side frame portion 71, and these mounting plate bodies 78 are fixed by welding. The support 61 is attached to the mounting plate 78.
Bolt insertion holes 7 through which the bolt insertion holes 62 can freely communicate.
9 are formed vertically.

In such a conventional structure, when assembling the rear axle 60 to the vehicle body 70, the rear axle 60 is positioned in the recess 77 as shown by a virtual line in FIG. 78
To the bolt insertion hole 79. Next, the bolt 65 is inserted from above into the bolt insertion hole 62 from the bolt insertion hole 79, and then tightened and fixed by the nut 66.

[0006]

According to the above-mentioned conventional structure, the structure in which the pair of supports 61 are provided on the rear axle 60 so as to be relatively rotatable is complicated and expensive. Further, the vehicle body 70 has a connecting plate portion 75 and a connecting shape member portion 76, which are frame strength members, in addition to the mounting plate 78 for mounting the rear axle 60. Had become expensive. Furthermore, lubricating oil (grease) has to be frequently supplied to the relative rotation portion between the rear axle 60 and the support 61, and there is a problem in workability because the lubrication interval is short.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rear axle arrangement structure for an industrial vehicle, which can simplify the support structure of the rear axle and make it compact and lightweight.

[0008]

In order to achieve the above-mentioned object, according to the present invention, a rear axle arrangement structure for an industrial vehicle according to the present invention is provided on each of the front and rear surfaces of the rear axle. A held member having a recess opened toward the rear is provided, and a pair of front and rear support members are fixed between the pair of left and right side frame portions constituting the vehicle body so that a rear axle can be freely arranged therebetween. Is characterized in that a through hole that can communicate with the recess is formed, and a holding member that can be inserted from the outside into the recess from the communicated through hole is provided.

Therefore, according to the first aspect of the present invention, when the rear axle is assembled to the vehicle body, the holding member is recessed from the outside and the holding member is recessed from the through hole while the recess of the held member communicates with the through hole of the support member from the inside. It can be done by inserting it into the place. At this time, the pair of side frame parts are connected and fixed to each other by a support member that rotatably supports the rear axle via a holding member, so that the side frame part is supported by the support material that supports the rotation of the rear axle. And a sufficient strength can be ensured. And, the fixing of the support material to the side frame portion can be easily and accurately performed by welding. Further, since the support material only forms the through-hole, the hole processing can be performed at the same time in the front and rear directions. Can be formed.

According to a second aspect of the present invention, there is provided a rear axle arrangement structure for an industrial vehicle according to the first aspect, wherein the holding member includes an outer peripheral surface of the holding member and an inner peripheral surface of the recess. A lubricating oil retaining portion communicating from the inside of the recess is formed between the lubricating oil retaining portions.

According to the second aspect of the present invention, by supplying the lubricating oil to the lubricating oil retaining portion, the lubricating oil in the lubricating oil retaining portion is supplied to the rotation support portion of the rear axle with respect to the retaining member. Can be supplied automatically at any time through the gap between the inner end face of the recess and the lateral depth of the recess. Since a large amount of lubricating oil can be sealed in the lubricating oil retaining portion, the lubrication interval can be sufficiently long (extended significantly) in a maintenance-free state. Further, the relative movement between the vehicle body side and the rear axle in the front-rear direction is restricted by receiving a load between the inner end surface of the holding member and the laterally deep surface of the recess, that is, between the surfaces that are oil-lubricated. obtain.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2, a vehicle body 2 of a construction vehicle 1 which is an example of an industrial vehicle includes a front body portion 2A provided with a pair of left and right front wheels 3 and a pair of left and right rear wheels 4.
Is provided on the rear body portion 2B. Both body parts 2A, 2
B are vertically rotatably connected to each other by a vertical connecting shaft 5 which is divided up and down, and between the vehicle body parts 2A and 2B,
A steering cylinder 6 is provided.

An operating section 7 having a seat, various levers, and the like is provided above the front end of the rear body section 2B. A pair of right and left booms 8 are disposed in front of the driving unit 7.
The base ends of these booms 8 are attached to brackets 9 provided at the upper rear end of the front vehicle body 2A via support shafts 10 in the left-right direction, so that they can swing up and down. A cargo handling cylinder 11 for vertically swinging the boom 8 is provided between the front vehicle body 2A and the boom 8.

A bucket device (working device) 13 is attached between the free ends of the booms 8 via horizontal pins 12 in the left-right direction. A second link 16 is connected to a free end of a first link 15 attached to the boom 8 via a pin 14 by a pin 17, and the free end of the second link 16 is connected to the bucket device 13 by a pin 18. Have been. Between the base end of the first link 15 and the boom 8, a bucket cylinder 19 for rotating the bucket device 13 around the horizontal pin 12 is provided.

The front wheels 3 are attached to the front vehicle body 2A via a front axle 20, and the rear wheels 4 are attached to the rear vehicle body 2B via a rear axle 21.

In FIGS. 1, 3 to 5, a rear axle 21 is provided with connecting members 22 on the front and rear sides of a central portion thereof.
Is provided. These connecting members 22 are made of a C-shaped material,
The free ends of the leg plate portions 22a are fixed to the center of the rear axle 21 by welding or the like with the pair of leg plate portions 22a positioned vertically. Thereby, the flat plate portion 22b of the connecting member 22 faces forward or backward, and the held member 23 is provided on the front surface or the rear surface, respectively. Each held member 23 has a cylindrical shape with a bottom,
4 with the opening of the flat plate portion 22b facing forward or backward.
Is fixed by welding or the like. The opening of the recess 24 is formed in a step 25 having a large diameter.

The rear body portion 2B includes a pair of left and right side frame portions 30, a plurality of upper and lower front frame portions 31 provided between front portions of the side frame portions 30, and a side frame portion 30.
And a rear frame portion 33 provided between the rear end surfaces of the side frame portions 30.
The vertical connection shaft 5 is disposed on the front frame portion 31.

A recess 34 is formed in an intermediate portion of the side frame portion 30 to allow the rear axle 21 to be fitted from below. A support member 35 is provided between the side frame portions 30 both before and after the concave portion 34 so that the rear axle 21 can be freely arranged, and is fixed by welding. Both support members 35 are in the shape of a long plate, and are formed in a V-shape extending in the left-right direction when viewed from the front-back direction.
A through hole 36 in the front-rear direction is formed at the center in the left-right direction of both support members 35 so as to be freely communicable with the recess 24. Is formed.

A holding member 40 is provided which can be inserted from the outside into the recess 24 through the communicating through hole 36. The holding member 40 has a pin portion 41 that is densely inserted into the through hole 36.
And a flange portion 42 which is externally fitted to the outer end of the pin portion 41 and fixed by welding. The insertion of the holding member 40 is restricted by abutting the flange portion 42 on the outer surface of the support member 35, and a plurality of bolts 46 passed through the flange portion 42 from outside are screwed into the support member 35 side. Thus, the support member 35 is fixed to the support member 35 side.

In such a fixed position, the length of the pin portion 41 is set so as to be fitted (entered) into the recess 24. When fitting, a bush 47 permeable to lubricating oil is interposed between the outer peripheral surface of the pin portion 41 and the inner peripheral surface of the recess 24, and between the step portion 25 and the pin portion 41. In addition, a dust seal 48 and an oil seal 49 are interposed, and a ring-shaped cover 50 is interposed.

The pin portion 41 has a cylindrical shape with a bottom and its opening is directed toward the recess 24, that is, between the outer peripheral surface of the pin portion 41 and the inner peripheral surface of the recess 24. A lubricating oil retaining portion 43 is formed so as to communicate with the inside of the recess.
The lubricating oil (grease) A for the lubricating oil retaining portion 43
End (bottom part) of pin part 41 for supply (replenishment)
Is formed with a lubricating oil passage 44, and a bolt stopper 45 for opening and closing the lubricating oil passage 44 is provided.

The operation of the above embodiment will be described below. The construction vehicle 1 can travel forward or backward by forcibly driving the wheels 3 and 4 forward or backward, and can stop by applying a brake. Also, the bucket device 13 is driven by the engine or the like via the boom 8 or the like.
Can be activated.

To assemble the rear axle 21 to the rear vehicle body 2A in the construction vehicle 1 as described above, first, the bush 47 is set in the recess 24, and the dust seal 48, the oil seal 49, the cover 50 and Is set, the rear axle 21 is positioned in the recess 34.

Next, with the recess 24 of the held member 23 facing the through hole 36 from the inside, as shown by the imaginary line in FIG. 1, the holding member 40 facing the through hole 36 from the outside. The pin portion 41 is inserted into the recess 24 from the communicating through hole 36. This insertion is restricted by abutment of the flange portion 42 on the outer surface of the support member 35, and a plurality of bolts 46 passed through the flange portion 42 from outside.
Is screwed to the support member 35 side to fix the holding member 40 to the support member 35 side.

Thus, as shown in the solid line of FIG. 1 and FIGS. 3 to 5, the rear axle 21 can be assembled to the rear vehicle body 2A. At this time, the pair of side frame portions 30
Are connected and fixed to each other by a support member 35 that rotatably supports the rear axle 21 via a holding member 40, so that the support member 35 that supports the rear axle 21 to rotate supports the frame between the side frame portions 30. The strength member can also be used, and sufficient strength can be ensured, so that the vehicle body structure can be simplified, compact and lightweight, and the overall cost can be reduced.

As described above, after the rear axle 21 is assembled to the rear vehicle body 2A, the lubricating oil A is supplied to the lubricating oil retaining portion 43. That is, the bolt stopper 45
After the lubricating oil A is supplied (supplemented) in the lubricating oil retaining portion 43 through the opened lubricating oil passage 44 in a filled state, the lubricating oil passage 44 is closed by mounting a bolt stopper 45.

When the construction vehicle 1 is traveling, the pin 4
The lubricating oil A in the lubricating oil retaining portion 43 is applied to the rotation support portion of the rear axle 21 with respect to
Is automatically supplied at any time through the gap between the inner end surface of the lubricating pin portion 41 and the laterally deep surface of the recess 24,
The rotation is always performed smoothly. Since a large amount of the lubricating oil A is sealed in the lubricating oil retaining portion 43, the lubrication interval can be sufficiently long (significantly extended) in a maintenance-free state, thereby improving workability. obtain.

The entry of dust into the bush 47 and the outflow of the lubricating oil A from the bush 47 are prevented by the dust seal 48 and the oil seal 49. Further, the relative movement of the rear axle 21 in the front-rear direction between the rear body portion 2A side and the rear axle 21 is regulated by receiving a load between the inner end surface of the pin portion 41 and the laterally deeper surface of the recess 24.
Here, since the inner end surface and the inner side surface are oil-lubricated, the load is received with little wear.

The fixing of the support member 35 to the side frame portion 30 can be easily and accurately performed by welding. Further, since the support material 35 only forms the through-hole (pin hole) 36, the support material 35 can be formed easily and accurately, for example, the hole processing can be performed simultaneously in front and rear.

In the above-described embodiment, the lubricating oil retaining portion 43 is formed on the holding member 40. However, the retaining member 40 in which the lubricating oil retaining portion 43 is not formed may be used.

In the embodiment described above, an industrial vehicle equipped with a bucket device 13 as a working device is shown, but this is an industrial vehicle equipped with a clamping device, a lift device, etc. as a working device. There may be.

In the above-described embodiment, the vehicle body 2 is
Although a divided form composed of a front body part 2A and a rear body part 2B is shown, this may be an integrated body.

[0033]

According to the first aspect of the present invention, when the rear axle is assembled to the vehicle body, the concave portion of the held member communicates with the through hole of the support member from the inside.
This can be performed by inserting the holding member from the outside into the recess from the through hole. At this time, the pair of side frame parts are connected and fixed to each other by a support member that rotatably supports the rear axle via a holding member, so that the side frame part is supported by the support material that supports the rotation of the rear axle. And a sufficient strength can be ensured, whereby the vehicle body structure can be simplified, compact and lightweight, and the overall cost can be reduced. The fixing of the support material to the side frame portion can be easily and accurately performed by welding, and since the support material only forms a through-hole, the hole processing can be performed simultaneously in the front and rear directions. It can be formed with high accuracy.

According to the second aspect of the present invention,
By supplying the lubricating oil to the lubricating oil retaining portion, the lubricating oil in the lubricating oil retaining portion is supplied to the rotation support portion of the rear axle with respect to the holding member by the inner end surface of the retaining member and the laterally deep inner surface of the recess. It can be automatically supplied at any time through the gap, and its rotation can always be performed smoothly. And since a large amount of lubricating oil can be sealed in the lubricating oil retaining part,
It can be sufficiently long (extended significantly) in a maintenance-free state, thereby improving workability. Furthermore, the relative movement between the vehicle body side and the rear axle in the front-rear direction can be restricted by receiving a load between the inner end surface of the holding member and the laterally deep surface of the recess, that is, between the surfaces that are oil-lubricated. Thus, the load can be received with little wear.

[Brief description of the drawings]

FIG. 1 shows an example of an embodiment of the present invention, and is a partially cutaway side view of a main part of a rear axle arrangement structure of an industrial vehicle.

FIG. 2 is a side view of the industrial vehicle.

FIG. 3 is a partially cutaway side view of a rear axle arrangement structure of the industrial vehicle.

FIG. 4 is a partially cutaway plan view of a rear axle arrangement structure of the industrial vehicle.

FIG. 5 is a partially cutaway front view of the rear axle arrangement structure of the industrial vehicle.

FIG. 6 is a perspective view of a rear axle of an industrial vehicle, showing a conventional example.

FIG. 7 is a partially cutaway side view of the rear axle arrangement structure of the industrial vehicle.

FIG. 8 is a plan view of a rear axle arrangement structure of the industrial vehicle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Construction vehicle (industrial vehicle) 2 Body 2A Front body part 2B Rear body part 5 Vertical connection shaft 6 Steering cylinder 8 Boom 11 Loading cylinder 13 Bucket device (working device) 19 Bucket cylinder 20 Front axle 21 Rear axle 22 Connecting member 23 Cover Holding member 24 Recess 30 Side frame 34 Recess 35 Support material 36 Through hole 40 Retaining member 41 Pin 42 Flange 43 Lubricating oil retaining portion 44 Lubricating oil passage 47 Bush 48 Dust seal 49 Oil seal A Lubricating oil

Claims (2)

(57) [Claims] 1. A front and rear surface of a rear axle is provided with a held member having a recess opened outward in the front-rear direction, and a pair of front and rear side frames constituting a vehicle body is provided between a pair of left and right side frame portions. A support member is fixed between the support member and the rear axle so that the rear axle can be freely arranged.The support member has a through hole that can communicate with the recess, and a holding member that can be inserted from the outside into the recess from the communicated through hole to the recess. A rear axle arrangement structure for an industrial vehicle, which is provided. 2. The holding member has a lubricating oil retaining portion formed between the outer peripheral surface of the holding member and the inner peripheral surface of the concave portion, the lubricating oil retaining portion being communicated from the inside of the concave portion. The rear axle arrangement structure of the industrial vehicle described in the above.