JPH04114Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention provides a slide bracket that is slidable in the left and right directions on the vehicle body, and a swing bracket is attached to the slide bracket to swing left and right through a vertical pinion shaft. The swing bracket is provided with a backhoe device which is freely pivotable and can swing up and down, and the swing bracket is moved left and right with respect to the slide bracket as the rack engages with the pinion shaft at its upper part. The present invention relates to a connecting portion of a backhoe device in which a pair of hydraulic cylinders for driving and swinging the rack are provided at both left and right ends of the rack.

[Conventional technology]

Conventionally, in the above-mentioned connecting section, as shown in FIG. 4, the pinion shaft 10 is integrally connected to the slide bracket 5, and the bush 19 that is externally fitted onto the pinion shaft 10 is internally fitted into the swing bracket 9 within its vertical width. , the rack 12 and the hydraulic cylinder 17 were attached to the swing bracket 9.

[Problem that the invention attempts to solve]

However, as the rack 12 is moved by the drive of the hydraulic cylinder 17 and the swing bracket 9 is swung left and right, the rack 12 and the hydraulic cylinder 17 rotate together with the swing bracket 9 around the pinion shaft 10. , a rack 12 long in the left-right direction and hydraulic cylinders 1 provided at both ends thereof.
As shown by the imaginary line in FIG. 4, the rack 12 and the hydraulic cylinder 17 must be installed at a high position so that they do not interfere with the slide bracket 5, and the slide bracket 5 must be placed at a high position. In addition to restrictions on the distance between the backhoe device 4 and the vehicle body 13, the vertical width of the slide bracket 5 cannot be made small in order to stably attach the backhoe device 4 to the vehicle body 13, which has the disadvantage that the entire connecting portion becomes large. .

Moreover, if the pinion shaft 10, the rack 12, the seals around the pinion shaft 10, etc. are damaged, the pinion shaft 10 must be removed from both brackets 5, 9 for repair, and at this time, the tip of the backhoe device 4 must be grounded. Even if the pinion shaft 10 was removed in this state, there was a risk that the swing bracket 9 would come off from the slide bracket 5, which would significantly worsen the repair work.

Therefore, in order to prevent both brackets 5 and 9 from coming off even when the pinion shaft 10 is removed, the pinion shaft 10 is integrated with the slide bracket 5 by spline fitting to the lower end of the pinion shaft 10, as shown in FIG. It has been considered to fit the spline boss 20 for connection between the slide bracket 5 and the swing bracket 9, but the length of the bush 19, which is fitted inside the swing bracket 9 and is subject to high surface pressure, has been considered. 1
There was a risk that the durability of 9 would deteriorate.

The purpose of this invention is to make it possible to reduce the vertical width of the entire connecting part, without reducing the durability of the bushing that rotatably supports the pinion shaft.
The purpose is to prevent both brackets from separating from each other even if the pinion shaft is removed from both brackets.

[Means for solving problems]

The characteristic structure of the connecting part of the backhoe device of the present invention is that the pinion shaft is integrally connected to the swing bracket, the rack and the hydraulic cylinder are attached to the slide bracket, and the bush that is externally fitted on the pinion shaft is extended across both brackets. The function and effect are as follows.

[Effect]

In other words, when the rack is slid left and right by the drive of the hydraulic cylinder, only the swing bracket rotates left and right around the pinion axis with respect to the slide bracket, and the rack attached to the slide bracket and its both ends are rotated. The provided hydraulic cylinder does not swing. Therefore, the rack and hydraulic cylinder do not have to be placed at a higher position than the upper end of the slide bracket so that they do not interfere with the upper end of the slide bracket, as in the conventional case.
The swing bracket can be swung left and right.

Moreover, the bushing that fits inside both brackets is longer than the conventional one, and even if the pinion shaft is removed from both brackets, the bushing not only prevents both brackets from separating from each other, but also makes it easy to do so. Since the hydraulic cylinder and hydraulic cylinder are attached to the slide bracket, the load of the rack and hydraulic cylinder does not act on the swing bracket and cause it to fall sideways, unlike in the conventional case. Do not deform the bushings.

[Effect of idea]

Therefore, the vertical width of the entire connecting portion can be reduced without reducing the vertical width of the slide bracket, and the connecting portion can be made smaller and less bulky while stably attaching the backhoe device to the vehicle body. In addition, it eliminates wear and deformation of the bushing that rotatably supports the pinion shaft, improving durability while improving workability for repair and inspection of the pinion shaft, rack, and seals around the pinion shaft. Now I can maintain it.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

As shown in Fig. 3, wheels 1 and 2 are mounted on the front and rear of the machine, a shovel loader 3 is installed at the front for scooping up and transporting earth and sand, and a backhoe device 4 for ground excavation work is installed at the rear. The work vehicle is configured to be able to carry out both scooping and transporting and ground excavation work.

The backhoe device 4 is attached to a swing bracket 9 so as to be swingable up and down about a horizontal axis X, and the swing bracket 9 is pivoted to a slide bracket 5 via a pinion shaft 10 in the vertical direction and a vertical shaft 11 so as to be swingable left and right. Support, the slide bracket 5
is an attachment mounting portion 14 formed at the rear end of the vehicle body 13, which is provided so that the position can be changed as the attachment frame 6 is slid in the lateral direction of the vehicle body along guides 7 and 8 provided on the mounting frame 6. It is detachably attached to the mounting frame 6 by inserting and removing the connecting pin 15, and on both left and right sides of the mounting frame 6,
A pair of outriggers 16 that are vertically telescopic are provided so that ground excavation work by the backhoe device 4 can be performed stably, the tip of the backhoe device 4 is grounded, and the left and right outriggers 16 are extended. It is configured so that the backhoe device 4 can be removed from the vehicle body and stored in a ground action state by being supported at three points.

As shown in FIGS. 1 and 2, the lower end of the pinion shaft 10 is integrally connected to the swing bracket 9, and as the rack 12, which engages the pinion shaft 10 at its upper portion, is slid from side to side, the swing bracket 9 A pair of hydraulic cylinders 17, 17 for driving and swinging the slide bracket 5 left and right are provided on both left and right ends of the rack 12, and the rack 12 and the hydraulic cylinders 17 are attached to the upper part of the slide bracket 5.

The pinion shaft 10 is rotatably attached to the slide bracket 5 by bushes 18 and 19 that fit onto the pinion shaft, and its lower end is integrally connected to the swing bracket 9, and is formed as follows. That is, the spline boss 20, which is spline-fitted to the lower end of the pinion shaft 10, is fitted inside the swing bracket 9, and is connected to the swing bracket 9 via the bolt 22 while being aligned in the circumferential direction with the knob pin 21. .

The lower end of the bush 19 and the upper end of the spline boss 20 are in contact with each other and have the same outer diameter, and the bush 19 is fitted over both the brackets 5 and 9.

In the figure, 23 is a thrust collar, 24 is a cover that fits around the upper end of the pinion shaft 10 and supports it rotatably.
When the cover 24 is removed from the slide bracket 5, the pinion shaft 10 can be pulled out upward from both brackets 5 and 9.

A vertical shaft 11, which pivotally supports the lower part of the swing bracket 9, is rotatably supported by the slide bracket 5 via a bush 26.

[Another example]

The means for integrally connecting the pinion shaft 10 to the swing bracket 9 may be, instead of using the spline boss 20, directly spline fitting the pinion shaft 10 and the swing bracket 9 without using the spline boss 20. Other means may also be used.

[Brief explanation of drawings]

The drawings show an embodiment of the connecting part of the backhoe device according to the present invention, and FIG. 1 is a vertical sectional side view of the main part, FIG. 2 is a sectional view taken along the - line in FIG. , FIG. 4 is a vertical sectional side view of a main part of a conventional example, and FIG. 5 is a sectional view of a main part of a comparative example. 4... Backhoe device, 5... Slide bracket, 9... Swing bracket, 10... Pinion shaft, 12... Rack, 13... Vehicle body, 17...
...Hydraulic cylinder, 19...buzz.

Claims (1)

[Scope of utility model registration request] A slide bracket 5 that is slidable in the left and right directions is provided on the vehicle body 13, and a swing bracket 9 is pivotally supported on the slide bracket 5 so as to be swingable in the left and right directions via a pinion shaft 10 in the vertical direction. A movable backhoe device 4 is provided, and a pair of hydraulics drive and swing the swing bracket 9 left and right with respect to the slide bracket 5 in accordance with the left and right sliding operation of the rack 12 that engages the pinion shaft 10 at its upper portion. cylinder 1
7 and 17 are connecting portions of the backhoe device provided on both left and right ends of the rack 12, which integrally connects the pinion shaft 10 to the swing bracket 9 and allows the rack 12 and the hydraulic cylinder 17 to slide. A connecting portion of a backhoe device in which a bush 19 attached to a bracket 5 and fitted externally on the pinion shaft 10 is fitted inside the bushing 19 across both the brackets 5 and 9.