JPH07205826A - Installing structure of hydraulic cylinder for power steering - Google Patents

Abstract

PURPOSE:To make easy the manufacture, the disassembly, and the assembly of a hydraulic cylinder, and to secure the holding of the thrust force, by forming thrust receivers to hold the thrust forces of hydraulic cylinders, at the ends of engaging members to support the plug bodies of the left side and the right side support brackets. CONSTITUTION:A pair of left side and right side support brackets 11 are installed allowable to mount and demount to an axle 4 side, and thrust receivers 13 to hold the thrust forces of hydraulic cylinders 5 are formed at the ends of engaging members 12 to support the plug bodies 9 of the left side and the right side support brackets 11. As a result, at a pair of left side and right side support brackets 11 installed allowable to mount and demount to the axle 4 side, the plug bodies 9 of the hydraulic cylinders 5 are supported by the engaging members 12, and the end faces of the plug bodies 9 are supported by the receivers 13, so as to hold the thrust forces of the hydraulic cylinders 5, and an excessive thrust force is not operated to a tube 7. And by separating the support brackets 11 from the front axle 4, the separation of the hydraulic cylinders 5 from the support brackets, and their disassembly and assembly can be carried out easily.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure for a hydraulic cylinder for power steering used for a steering wheel of a traveling vehicle.

[0002]

2. Description of the Related Art For example, in a power steering device such as a tractor, a front axle for steering wheels is laterally supported on a vehicle bearing stand via a center pin, and a power steering hydraulic cylinder is provided substantially along the front axle. The hydraulic cylinder is arranged, and a plug body through which the piston rod penetrates is provided at both left and right ends of a tube which is fitted onto the piston, and the plug body is attached to the front axle.

The structure for mounting this hydraulic cylinder on the front axle side is one in which a boss is welded to a tube and directly fixed to the front axle via a pin (first prior art), and a boss portion is integrally formed on a plug body. Which is directly fixed to the front axle (second prior art) and which is inserted and fixed in the axial direction into a fitting portion integrally formed with the front axle (third prior art, JP-A-5-15).
5345).

[0004]

In the first prior art, since the thrust load received by the hydraulic cylinder as a reaction force from the piston rod is directly applied to the boss welded to the tube, an unreasonable force is applied to the tube itself. Therefore, it is necessary to thicken the tube to increase the strength, and the manufacturing cost of the hydraulic cylinder is high.

In the second prior art, the problems of the first prior art are solved, but in order to attach / detach the hydraulic cylinder to / from the front axle, it is necessary to disassemble and assemble the hydraulic cylinder itself, which makes maintenance troublesome. ing. In the third prior art, the problem of the second prior art is solved, but it is difficult to support the thrust force applied to the hydraulic cylinder, and the front axle becomes large to form the fitting portion, so that the manufacturing is difficult. It's getting harder.

It is an object of the present invention to provide a mounting structure for a hydraulic cylinder for power steering, which facilitates the manufacture of the hydraulic cylinder itself, is easy to disassemble and assemble, and is capable of reliably supporting the thrust force. And

[0007]

A concrete means for solving the problem in the present invention is to support a steering wheel axle 4 on a vehicle bearing base 2 through a center pin 3 in a laterally installed manner. A hydraulic cylinder 5 for power steering is arranged substantially along, and a plug body 9 through which a piston rod 8 penetrates is provided at both left and right ends of a tube 7 which is fitted onto the piston 6, and the hydraulic cylinder 5 is constituted by the plug body 9. In the mounting structure of the hydraulic cylinder for power steering attached to the axle 4, the axle 4
A pair of left and right support brackets 11 is detachably attached to the side, and a thrust receiving portion 13 for supporting the thrust force of the hydraulic cylinder 5 is provided at the end of the fitting portion 12 that supports the plug body 9 of each of the left and right support brackets 11. Is formed.

[0008]

In the pair of left and right support brackets 11 detachably attached to the axle 4, the fitting portion 12 receives the plug body 9 of the hydraulic cylinder 5, and the thrust receiving portion 13 holds the end surface of the plug body 9. It supports and carries the thrust force of the hydraulic cylinder 5 so that an excessive thrust force does not act on the tube 7.

By separating the support bracket 11 from the front axle 4, the hydraulic cylinder 5 is attached to the support bracket 1.
1 can be easily separated, and the hydraulic cylinder 5 can be disassembled and assembled.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4, reference numeral 15 denotes an agricultural tractor, the vehicle body of which is composed of an engine, a transmission case, and the like, and a frame-shaped car bearing base 2 is projected forward from the engine, on which a radiator 16, a battery 17, and a battery 17 are provided. A support stay 19 for the air cleaner 18 and the like are mounted, and these are covered with a bonnet 20. A bumper 21 that also serves as a weight attachment is fixed to the front portion of the car bearing base 2, and a skirt 22 is provided on the front upper side thereof. ing.

A pair of front and rear pin receiving bases 25, 25 are fastened to the lower surface of the vehicle bearing base 2 by bolts.
The center pin 3 is rotatably supported on the center pins 5 and 25, and the front axle 4 is laterally fixed to the center pin 3. The front axle 4 has a structure in which the wheel distance can be adjusted, and movable front axles 4B are mounted on both sides of a center front axle 4A fixed to the center pin 3 so as to be able to change the position in the left-right direction via stop bolts 26. A front wheel, which serves as a steering wheel, is supported at the outer end of the vehicle so as to be steerable around the kingpin.

Reference numeral 1 is a power steering device for steering the front wheels, which is attached to the front axle 4 so as to swing integrally with the front axle 4 around the center pin 3. The hydraulic cylinder 5 of the power steering device 1 is disposed substantially along the front axle 4, and has a tube 7 serving as a main body, a plug body 9 closing both ends of the tube 7, and a reciprocating slidable inside the tube 7. A piston 6 and a piston rod 8 connected to the piston 6 and penetrating the plugs 9 on both sides, and both ends of the piston rod 8 are connected to the left and right tie rods.

The left and right plugs 9 of the hydraulic cylinder 5 are fitted and supported by a support bracket 11. The support bracket 11 includes a circular hole-shaped fitting portion 12 that fits the outer peripheral surface of the plug body 9, and a thrust receiving portion 13 that contacts the outer end surface of the plug body 9 formed at the inner end portion of the fitting portion 12. The thrust receiving portions 13 contact each other so as to sandwich the hydraulic cylinder 5 from both sides, and not only the front / rear / upper / lower position setting of the hydraulic cylinder 5 but also the horizontal position setting are performed.
The thrust force applied to is supported by the thrust receiving portion 13.

Each of the left and right support brackets 11 has a bolt insertion portion 11A, and is detachably fixed to a mounting base 28 via a nut by a bolt 27 inserted in the bolt insertion portion 11A. The mounting base 28 is a pair of left and right or one
It is formed of a single plate and is welded to the center front axle 4A and / or the center pin 3. A positioning pin 29 is provided on the mounting base 28, and is engaged with the support bracket 11 to set the position of the hydraulic cylinder 5.

Reference numeral 30 denotes a detent screw which is screwed into the mounting base 28 from below, and which is the engagement body 3 welded to the tube 7.
The tube 7 is prevented from rotating by engaging with 1. 32
Indicates a hydraulic hose connecting the tube 7 and the power steering controller of the steering wheel. The pin receiving bases 25, 25 are formed in the same shape, and the push bolt 33 for the center pin 3 and the receiving bolt 34 have the same diameter, which simplifies the screw hole processing.

In FIG. 3, a drain hose 36, one end of which is connected to the drain port 35 at the bottom of the radiator 16, has the other end connected to an end fitting 37 fixed to the back surface of the bumper 21. The end fitting 37 is configured such that a pipe 39 is welded to a plate member 38 and the plate member 38 is fixed to the back surface of the bumper 21 by bolts. The pipe 39 has a bulge portion 39A in the middle thereof, and the drain hose 36 fitted to the bulge portion 39A.
It is designed so that it will not easily come off due to vibration, etc., and if necessary, it may be possible to prevent it from coming off with a band.

The water of the radiator 16 can be drained from the pipe 39 through the tip of the drain hose 36, and the drain plug and the plug hole processing which are required in the related art are eliminated to reduce the cost. An insect screen 42 is arranged on the front surface of the radiator 16 to prevent attachment of straw, insects and the like. The insect net 42 has a pair of upper and lower hook-shaped engaging portions 43 on the left and right sides, and engages with an engaging pin 44 provided on the side surface of the radiator 16 from above, so that the radiator 16 can be easily attached to the radiator 16. It can be attached and detached.

The upper edge and the left and right edges of the insect net 42 are bent at a right angle to form an edge 42A, and a cushion 45 is provided between the edge 42A and the bonnet 20.
This cushion 45 presses the insect net 42 and shields the air flow. The pair of left and right support stays 19 are erected from the car bearing stand 2, and the upper portions thereof are connected by a connecting plate 47. The upper bracket 48 for attaching the air cleaner 18 to the upper portion and the holding bolt 49 for the battery 17 on the lower portion. The lower brackets 50 for locking are fixed to each other,
A cushion 51 is provided between the hood 20 and the upper surface of the connecting plate 47.

Since the support stay 19 also holds the battery 17, the support strength of the air cleaner 18 is improved, and the cushion 51 is provided between the support stay 19 and the bonnet 20 to suppress vibration. The bonnet 20 is pivotally supported on the tractor body side through a pivot in the upper rear portion, and the engine compartment can be opened by raising the front portion, and the lower front portion can be attached to the skirt 22 via a stopper 52. ing.

The present invention is not limited to the above embodiment, but can be variously modified. For example, axle 4
May be a rear axle, a drive wheel having a diff device and a transmission shaft therein, and the hydraulic cylinder 5 may be arranged in front of the front axle 4.

[0021]

According to the present invention described in detail above, a pair of left and right support brackets 11 are detachably attached to the axle 4 side,
Since the thrust receiving portion 13 that supports the thrust force of the hydraulic cylinder 5 is formed at the end of the fitting portion 12 that supports the plug body 9 of each of the left and right support brackets 11, the hydraulic cylinder 5 itself can be easily manufactured. In addition, it is easy to disassemble and assemble, and the thrust force can be reliably supported.

[Brief description of drawings]

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

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

FIG. 3 is a sectional side view of a front portion of the tractor.

FIG. 4 is a front explanatory view of the front lower part of the tractor.

[Explanation of symbols]

 1 Power Steering Device 2 Car Bearing Base 3 Center Pin 4 Front Axle 5 Hydraulic Cylinder 6 Piston 7 Tube 8 Piston Rod 9 Plug Body 11 Support Bracket 12 Fitting Part 13 Thrust Receiving Part

Claims (1)

[Claims] 1. An axle (4) for steering wheels is laterally supported on a vehicle bearing stand (2) via a center pin (3), and a hydraulic cylinder for power steering () is provided substantially along the axle (4). 5) is arranged, and the hydraulic cylinder (5) is constructed by providing a plug (9) through which a piston rod (8) penetrates at both left and right ends of a tube (7) which is fitted onto a piston (6). In a mounting structure of a power steering hydraulic cylinder in which a body (9) is mounted to an axle (4), a pair of left and right support brackets (11) are provided on the axle (4) side.
Detachably attached to the left and right support brackets (1
At the end of the fitting part (12) that supports the plug body (9) of 1),
A structure for mounting a hydraulic cylinder for power steering, characterized in that a thrust receiving portion (13) for supporting the thrust force of the hydraulic cylinder (5) is formed.