JPH0137337Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention provides a hub case that pivotally supports the front wheel at both left and right ends of an axle case that is connected and supported by the front part of the front frame. The left and right hub cases are connected via a tie rod so that they can be steered in conjunction with each other, and the steering hydraulic cylinder is connected to the tie rod or the left and right hub cases. The present invention relates to a vehicle body structure for mounting a power steering device of a tractor, which is provided so as to directly act on one of the hub case portions.

[Conventional technology]

As shown in FIG. 5, this type of power steering device includes a steering hydraulic cylinder 11 inserted into the front frame 2 and a steering hydraulic cylinder 11 that is pivotally connected to the front frame 2. At the same time, a relay arm 15 that can swing left and right around a fixed rotation axis P (see Fig. 4) is attached to a mounting seat 16 formed on the lower surface of the front frame 2, and the rear part of this relay arm 15 and As shown in FIG. 6, there is a split tie rod type which is configured by pivotally connecting connecting members 8, 8 provided at the rear of both hub cases 6, 6 and a pair of right and left tie rods 14, 14, and as shown in FIG. The connecting members 8, 8 provided at the front parts of the hub cases 6, 6 are pivotally connected to each other via one tie rod 19, and one of the hub cases 6, 6 is integrally connected to the rear part thereof. A hub case 6' is formed with a knuckle arm portion 6a on the hub case 6', and the knuckle arm portion 6a of this hub case 6' is
The axle case 3 is an axle case 3' having a bracket part 17 integrally formed near the center of the width of the rear side surface, and a steering hydraulic cylinder 10 is provided over the bracket part 17 of the axle case 3'. There are two types of steering: a single tie rod type, which is constructed by installing a In the case of agricultural tractors that use a steering system and have a large front wheel load, there are more restrictions on the selection of cylinder size, mounting location, etc. than when installing the steering cylinder by inserting it into the front frame. The latter type of steering, which is less sensitive, is adopted.

[The problem that the idea attempts to solve]

However, in configuring these two types of power steering devices, conventionally two types of front frames are used: one with a mounting seat for the steering hydraulic cylinder and one without. , two types of axle cases, one with and one without a mounting bracket for the steering hydraulic cylinder, and a hub case with the tie rod connecting member attached to one end in the longitudinal direction. , two types of hub cases are prepared: a hub case in which the tie rod connecting member is attached to one end side in the front-rear direction, and a knuckle arm is integrally formed at the other end side of one front end. Therefore, since it was designed to be compatible with both the split tie rod type and the single tie rod type, the overall number of parts was extremely large, resulting in high costs.

In view of the above-mentioned circumstances, an object of the present invention is to promote the common use of component parts so that two types of power steering devices can be constructed at low cost.

[Means to solve the problem]

Therefore, in the vehicle body structure for attaching the power steering device of a tractor described at the beginning, the present invention provides a tie rod pivot connection member at one location on the same end side in the longitudinal direction of both hub cases, and A mounting seat is provided on the upper surface of the pivot portion of either one of the hub cases for connecting the knuckle arm by covering it in a state facing the front-rear direction on the side opposite to the connecting member, and a mounting seat is provided on the upper surface of the pivot portion of either one of the hub cases, and the mounting seat is provided on the upper surface of the pivot portion of either one of the hub cases, and the mounting seat is provided for connecting the knuckle arm by covering it in a state facing the front-rear direction on the side opposite to the connecting member; The mounting seat for the hydraulic cylinder support bracket when the steering hydraulic cylinder acts on the knuckle arm is attached to the front end of the lateral side of the front frame, and the hydraulic pressure when the steering hydraulic cylinder acts on the tie rod is attached to the front end of the lateral side of the front frame. The structure is characterized in that mounting seats for cylinder support brackets are provided respectively.

[Effect]

○B In other words, in order to attach the steering hydraulic cylinder to the front frame or axle case, all you have to do is attach the cylinder support bracket to each mounting seat that is originally provided on the front frame or axle case, and also attach the cylinder support bracket to each mounting seat that is originally provided on the front frame or axle case. When a hydraulic cylinder is to be applied to the hub case, a knuckle arm for installing the hydraulic cylinder may be attached to a mounting seat originally provided in the hub case.

Of course, these brackets and nutcle arms can be left uninstalled if they are not needed.

○B In other words, in the past, two types of front frames, axle cases, and hub cases, which are major parts, had to be prepared in order to set up two types of steering types: split tie rod type and single tie rod type. In the present invention, by newly setting small parts such as the bracket and the knuckle arm, only one type of part needs to be set for each of the large parts, such as the front frame, axle case, and hub case.

[Effect of idea]

Therefore, while the effect of ○B allows two types of power steering devices, the split tie rod type and the single tie rod type, to be used and configured as before, the effect of ○B makes it possible to reduce costs accordingly. As a result, we were able to create a more rational power steering device.

〔Example〕

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

FIG. 3 shows that an axle case 3 with a built-in differential mechanism is pivotally connected to a front frame 2 that is fixedly connected to an engine 1 and can swing up and down within a certain range around the front and rear axles. Hub cases 6, 6, which support axles 5, 5 for mounting front wheels 4, 4, are freely steerable and rotatable around the vertical axis in bevel gear case parts 3A, 3A located at both left and right ends in a vertical orientation. At the same time, the left and right hub cases 6, 6 are forcibly rotated around the vertical axis by a steering hydraulic cylinder that expands and contracts by an amount corresponding to the amount of rotation of the steering handle 7. The front part of an agricultural tractor is shown in which the hub cases 6, 6 are configured to be removable to the left and right with respect to the bevel gear case parts 3A, 3A of the axle case 3.

As shown in FIGS. 1 and 2, the left and right hub cases 6, 6 are connected via a tie rod T so that they can be steered in conjunction with each other, and the steering hydraulic cylinder C is connected to the tie rod T or to one of the hub cases 6 and 6.
It is provided in such a way that it acts directly on one of the parts.

A tie rod pivot connecting member 8, 8 is provided at one location on the same end side in the front and back direction of both hub cases 6, 6, and both hub cases 6,
A mounting seat 9 is provided on the upper surface of the pivot portion 6b of one of the hub cases 6 to connect the knuckle arm 18 while facing in the front-rear direction on the side opposite to the connecting member 8. The mounting seat 12 of the hydraulic cylinder support bracket 17 when the steering hydraulic cylinder C acts on the knuckle arm 18 is attached to the front end portion of the lateral side of the front frame 2 at an approximately mid-width portion of the rear side. Mounting seats 13 for hydraulic cylinder support brackets 23 for use when the hydraulic cylinders C act on the tie rods T are respectively provided. The front frame 2 includes a hydraulic cylinder 11 connected and supported by the mounting seat 13 of the frame 2, and a pair of left and right tie rods 14, 14 pivotally connected to the connecting members 8, 8 of the hub cases 6, 6. A mounting seat 16 is provided which is a pivot shaft for a relay arm 15 that connects.

As shown in FIG. 2, the installation of the hub case 6 and the pivot portion 6b that is pivotally supported on the axle case 3, the installation of the mounting seat 13 of the front frame 2 and the bracket 23 for supporting the hydraulic cylinder 11, and the installation of the axle The mounting seat 12 of the case 3 and the bracket 17 for supporting the hydraulic cylinder 10 are both mounted by tightening bolts.

Therefore, the knuckle arm 18 is configured to be attached to the hub case 6 by jointly tightening two bolts on the upper surface of the pivot portion 6b for attaching the pivot portion 6b to the hub case body.

Then, as shown in FIG. 1, the hub cases 6, 6 are attached to the bevel gear case parts 3A, 3A of the axle case 3 with the tie rod connecting members 8, 8 located at the rear, and the front A steering cylinder 11 and a relay arm 15 pivotally connected to its telescopic rod are attached to both mounting seats 13 and 16 of the frame 2, and a tie rod 14 is attached between the connecting members 8 and 8 and the relay arm 15. , 14, and the hub cases 6, 6 in the state shown in FIG. 1, as shown in FIG.
, the bevel gear case parts 3A, 3 of the axle case 3
At A, the left and right connecting members 8, 8 for tie rods are placed in the forward position, and the brackets 17 fixedly connected to the mounting seats 12 of the axle case 3 with bolts and the left and right hub cases 6 are connected. A steering hydraulic cylinder 10 is mounted on the mounting seat 9, which is the upper surface of the pivot portion 6b of one of the hub cases 6.
and a knuckle arm 18 which is pivotally connected to the telescopic rod, and is attached with a bolt, respectively.
In addition, two types of single tie rod type power steering devices can be produced, in which one tie rod 19 is pivotally connected between the two connecting members 8, 8.

Further, it is advantageous in terms of cost if hole drilling, screw processing, etc. for each of the mounting seats are performed only on the mounting seat that corresponds to one of the steering modes to be adopted. If the holes and screws are machined uniformly, there is an advantage that even after completion of the tractor, it is possible to change between the split tie rod type and the single tie rod type.

At the lower end of the operating shaft 20 of the steering handle 7, there is a control unit 2 that supplies and discharges an amount of pressure oil according to the amount of rotational operation of the steering handle 7.
1 is provided, and this unit 21 and the steering cylinders 10 and 11 are configured to be able to be connected via piping 22.

In FIG. 3, 24 is a clutch housing 25 fixedly connected to the rear of the engine 1, 26 is a fuel tank, 27 is a battery,
28 is an engine bonnet.

In the present invention, the hydraulic cylinder 11 of the split tie rod type and the hydraulic cylinder 10 of the single tie rod type are collectively referred to as the hydraulic cylinder C, and the tie rods 14, 14 of the split tie rod type and the tie rod 19 of the single tie rod type are called the tie rod T. shall be called.

Incidentally, although a product number is written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of drawings]

The drawings show an embodiment of a vehicle body structure for mounting a power steering device for a tractor according to the present invention, and FIGS. 1 and 2 are plan views showing a split tie rod type power steering device and a single tie rod type power steering device, respectively. Figure 3 is a side view of the front of an agricultural tractor;
The figure is a perspective view from below of the front frame, FIG.
FIG. 6 is a plan view showing conventional examples of split tie rod type and single tie rod type power steering devices, respectively. 2...Front frame, 3...Axle case, 4...
...Front wheel, 6...Hub case, 6b...Pivotal part, 8
... Connection member for tie rod, 9 ... Installation seat for nutcle arm, 12, 13 ... Installation seat, 17,
23...Bracket, 18...Natsukuru arm,
C...Hydraulic cylinder, T...Tie rod.

Claims (1)

[Scope of utility model registration request] A hub case 6 that pivotally supports the front wheel 4 is attached to both left and right ends of the axle case 3 which is connected and supported by the front part of the front frame 2, and is rotatable for steering around a vertical axis provided at both ends. The left and right hub cases 6, 6 are connected to each other via a tie rod T so that they can be steered in conjunction with each other, and the steering hydraulic cylinder C is attached to either the tie rod T section or one of the hub case 6 sections. A vehicle body structure for attaching a power steering device of a tractor, which is provided in a state where it directly acts on the power steering device, and includes a member for connecting a tie rod pivot at one location on the same end side in the longitudinal direction of both hub cases 6, 6. 8,8
At the same time, a mounting seat 9 is provided on the upper surface of the pivot portion 6b of one of the hub cases 6, 6 for connecting the knuckle arm 18 over the upper surface of the pivot portion 6b on the side opposite to the connecting member 8. A mounting seat 12 for a hydraulic cylinder support bracket 17 when the steering hydraulic cylinder C acts on the knuckle arm 18 is provided on the rear side surface of the axle case 3 at a substantially mid-width portion of the front frame. A vehicle body structure for mounting a power steering device of a tractor, in which a mounting seat 13 for a hydraulic cylinder support bracket 23 when a steering hydraulic cylinder C acts on a tie rod T is provided at the front end portion of the lateral side of the tractor.