JPH01235731A - Service car, particularly, tractor shovel - Google Patents

Abstract

PURPOSE: To improve stability by engaging a vehicle side end part of a rising arm with the inside of a recess of a front part of a frame, and slightly projecting a quick-change device in the lower direction by going over a space between wheels. CONSTITUTION: In a rising arm 4, the inside of passage-like recess 6 of a front part 1 of a frame 2 is locked so as to be turnable around a horizontal shaft 5. A quick-change device 7 is installed in a front end part of the arm 4 together with a shovel catch receiving pivot 8 having a projected side part to be slightly projected by going over a space between front wheels 9. A rising cylinder 14 for driving a loading apparatus 3 is supported in a link shape on a rear wall of the arm 4. A lower end part of an inclined cylinder 13 is locked on a lower end part of an inclined crane 17 arranged around a central shaft 18 so as to be turnable, and an upper end part is connected to an upper end part 20 of the quick-change device 7 via an inclined rod 21.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a work vehicle, in particular a tractor seatbelt, which has a loading device disposed at the center of the front, and a lift supported at the front by its lifting arm. A cylinder, a tilting crane, and a quick change device at the front end are engaged, and the device is connected in a linked manner via a tilting rod to a tilting crane operated by the tilting cylinder.

BACKGROUND OF THE INVENTION Tractor shovels of this type have been known for a long time and are equipped with swivelable rear wheels and non-swivelable front wheels to ensure stability during operation.

[Problem to be Solved by the Invention] The object of the invention is to allow, in the case of similar work vehicles, a pivotable front wheel with a maximum rotation angle of 40' or more, in which case the external force introduced via the loading device prevents the motor from moving. To provide a loading device in which the tilting stability of a vehicle around a transverse axis is not impaired.

Means for Solving the Problems In the case of the present invention, the above-mentioned object with respect to a device of the type mentioned at the beginning is achieved as follows.

The vehicle-side end of the lifting arm engages in a channel-like forwardly open front recess, the tilting cylinder is also locked in the front, and the lifting arm is configured as a narrow component, with the upper When viewed from the side, the quick change device finds a space at the maximum sunken position between the front wheels, so that when viewed from the side, only the quick change device slightly protrudes downward beyond the vehicle space. .

In the case of a similar construction of the 1-Lactor Siber, the lifting arm is ensured to be particularly small with respect to the tilting moments that occur about the vehicle transverse axis. This is achieved not only by the entry of the Ueno arm into the space between the wheels, but also by its deep pivoting into the recess at the front of the tractor shovel.

In the case of the invention, the lifting arm is constructed in such a way that even in the case of a maximum depression it finds a void in the interwheel space in the case of the front wheels which themselves have a large maximum angle of rotation. In this position, the tractor shovel is just in front of the front wheels, so
The tilting stability under load is improved or the counterweight position can be designed lower. The deep positioning of the lifting arm also provides the operator with an optimal view of the work area and a free field of view for the lifting operation.

For reasons of space, another inventive proposal is to swivel the cylinder and the tilting cylinder to the lower front part of the lifting arm so that the lifting arm has a side blade projecting towards the vehicle;
It serves this purpose that it covers both cylinders in the forward direction. This measure results in a construction of the hydraulic cylinder that is particularly protected against the working material. In terms of cross section, a case profile with blades attached to the sides, or a U-profile is preferred for the lifting arm. This protected configuration of the hydraulic cylinder can be further improved in that at least the tilting cylinder extends inside the lifting arm. In that case, the two cylinders can be pivotably arranged within a plane that is closely located relative to each other.

Similarly, for reasons of space, the quick-change device has a particularly simple design. The device has two laterally projecting connection pivots on each connection side, an upper receiving pivot for the shovel catch and a lower hydraulically axially retractable locking pivot. A simple feature with respect to known quick-change devices is that the locking pivots are each configured to be axially movable into the central bore of the side support pivot of the lifting arm, and the support pivots are arranged in a corresponding bushing of the quick-change device. The point is that it can be received in a rotatable manner.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

The tractor shovel shown in schematic side view in FIG. 1 has a loading device 3 centrally arranged in the front part 1 of its frame 2. The device 3 includes a lifting arm 4, and the arm 4
is pivoted around a horizontal axis 5 inside a passage-like recess 6 of the front part 1 and is locked therein. A quick change device 7 shown in the top view of FIG. 2 is attached to the front end of the lifting arm 4 together with a receiving pivot 8 for a shovel catch projecting from the side. In the top view of FIG. 2, the swivelable front wheel 9 of the tractor shovel is shown in a straight position. The ground front wheel is indicated by a dashed line 10, and the left front wheel is indicated by a dotted line 11 at a position having the maximum turning angle. In all wheel positions, the lifting arm easily finds space in the interwheel space, with only the quick change device with its lower end 12 latched to the front end of the lifting arm 4 protruding slightly beyond the interwheel space. You can see right away. In FIG. 1, the right front wheel 9 is depicted in the position indicated by the dash-dotted line 10 in FIG.

A rising cylinder 1 driving a tilting cylinder 13 and a loading device
The arrangement of 4 becomes clear from FIGS. 1 and 3. FIG. 1 shows how both cylinders are locked below the pivot shaft 5 of the lifting arm 4 inside the recess 6 in the front part 1 of the tractor shovel. Cross-sectional view J of the loading device shown in Figure 3:
It can be seen that both cylinders move in a plane located closely to each other on the rear side of the lifting arm 4. That is, they then partially engage between the side blades 38 which project beyond the rear wall 39 of the case-shaped lifting arm 4 in the cross section.

The lifting cylinder 14 arranged at the lowest part is supported in a link-like manner on the rear wall 39 of the lifting arm 4 with its lower end near the holding plate 15. The lower end of the tilting cylinder 13 is anchored to the lower end of a tilting crane 17, which pivots around a central shaft 18 supported in the lifting arm 4.

The upper end 19 of the inclined cylinder 17 is linked in a linked manner via an inclined rod 21 with the upper end 20 of the quick change device.

FIG. 4 shows a side view of the quick change device 7 with a receiving pivot located in the upper part for a shovel catch 22, which is located behind the tractor shovel 23 shown in dash-dotted lines. At the lower end 12, the quick change device is provided with an O-sock pivot 24 which is moved forward and backward in the axial direction by hydraulic pressure, and the pivot 24 engages in a corresponding hole in an eye 25 provided on the lower side of the tractor shovel. The eye 25 and the shovel main 11 joint 22 are arranged on opposing stems 26 on the rear side of the novel 23.

From the sectional view of FIG. 5, it can be seen that the receiving pivot 8 for the shovel 1-V gear is constituted by an end portion of a continuous shaft 27 projecting to the opposite side of the quick change device 7. The shaft 27 is mounted in a corresponding bore in the upper end 20 of the quick-change device 7 so as to prevent rotation and axial movement. A pivot shaft 28 at the lower end of the inclined rod 21 is locked at the center of the shaft.

The lower end of the lifting arm 4 is laterally constructed with a support pivot 30, which pivotably engages in a corresponding bushing 29 of the quick-change device 7. The adjustment nut on the upper arm 4 is located in the center receiving hole 4 for the lock pivot 24.
0, the circumferential bore 40 with its inner end 31 borders a central pressure space 32 in which the working oil is applied. 2 more
Two pressure spaces 33 are configured behind the piston portion 34 at the inner end of the locking pivot 24 . Center pressure piping 3
When the pressure space 32 is pressurized via 5, the two pivots 24 move outward. central space 32
is in an unpressurized state and both outer pressure pipes 36 are loaded with working oil and it is applied to the pressure horn space 33, both lock pivots 24 enter, and with it, the seat 7 bell 2
Ai 25 of 3 is released. The packing element 37, which is fixed to the bearing bush and is detachable, can be easily installed in the receiving hole 40, since a part of the locking pivot 24 having a narrowed diameter is introduced into the hole.

[Brief explanation of the drawing]

Figure 1 is a side view of the tractor shovel, Figure 2 is a top view of the tractor shovel in Figure 1, Figure 3 is a cross-sectional view of the loading device of the tractor shovel, and Figure 4 is a quick change Side view of the device, Figure 5 is taken from v-V in Figure 4.
It is an arrow sectional view. 1... Front part 3... Loading device 4... Lifting arm 6... Recess 1... Quick change device 8... Receiving pivot 9... Front wheel 13... Inclined cylinder 14.・・Rising cylinder 17 ・・Tilt crane 21 ・・Tilt rod 22 ・・Silver catch

Claims (6)

[Claims] (1) a lifting cylinder (14) with a loading device located centrally in the front and supported at the front by its lifting arm (4);
The tilting cylinder (13) and the quick change device (7) at the front end are locked, and the device is connected in a link form to the tilting crane (17) which can be driven by the tilting cylinder (13) via the tilting rod (21). In a working vehicle, in particular a tractor shovel, the end of the lifting arm (4) on the vehicle side engages in a recess in the channel-like forwardly open front part (1), and the inclined cylinder (13
) is also anchored to the front part (1), and the lifting arm (4) is configured as a narrow component, so that when viewed from above the quick-change device finds space in the maximum sunk position between the front wheels (9). A working vehicle, in particular a tractor shovel, characterized in that, when viewed from the side, only the quick-change device (7) projects slightly in the downward direction beyond the inter-wheel space. (2) The rising cylinder (14) and the tilting cylinder (13) are locked to the lower side of the rising arm (4) of the front part (1), and the rising arm (4) is a side blade member ( 38
2. Tractor shovel according to claim 1, characterized in that it has a cylindrical section (20) covering both cylinders in the forward direction. 3. Tractor shovel according to claim 2, characterized in that at least the tilting cylinder (13) partially extends inside the lifting arm (4). 4. Tractor shovel according to claim 2, characterized in that both cylinders are arranged so as to be pivotable in a plane lying closely next to each other. (5) The quick change device (7) has two laterally projecting connecting pivots on each connecting side, an upper receiving pivot (8) for the shovel catch (22) and a lower hydraulically axially projecting connecting pivot. Lock pivot that can move forward and backward (2
4) The tractor shovel according to claim 1, further comprising: 4). (6) The lock pivot (24) is connected to the rising arm (
4) is arranged for axial movement in the central bore of the side support pivot (30), said support pivot (30) being connected to the corresponding bushing (29) of the quick change device (7).
6. The tractor shovel of claim 5, wherein the tractor shovel is pivotably received within the tractor shovel.