JPH035173Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a power steering device for various vehicles such as tractors.

[Prior art]

Tractor power steering devices have traditionally been
It is constructed as shown in FIG. That is, the fifth
In the figure, 1 is the front axle case, and center axle 2
A front wheel differential device 6 is swingably supported by a front axle frame 4 via a bracket 3, and inside this front axle case 1 is a front wheel differential device 6 driven by a rear input shaft 5.
is incorporated. Left and right front wheels 10 are supported at both left and right ends of the front axle case 1 via a gear case 7, a king pin 8, and a front wheel case 9, and the front wheels 10 can be steered around the king pin 8 together with the front wheel case 9. Reference numeral 11 denotes a power steering cylinder, which is arranged in front of and parallel to the front axle case 1, and a piston rod 12 that protrudes left and right from this cylinder 11.
is connected to a knuckle arm 14 of the front wheel case 9 via a tie rod 13. Therefore, when the cylinder 11 is actuated by operating a handle (not shown), the front wheel case 9 rotates around the king pin 8, and the front wheel 10 can be turned in a predetermined direction.

[Problems that the invention attempts to solve]

However, in the conventional power steering device as described above, when the piston rod 12 of the cylinder 11 is moved back to the left after the front wheel 10 is turned sharply to the right as shown by the imaginary line in FIG. Since the direction is as shown in the figure, there is a problem that the directionality is poor and it is difficult for the front wheel 10 to return smoothly.

[Means for solving problems]

In view of this problem, the present invention is designed to efficiently transmit steering force from the cylinder 11 to the front wheels 10, and at the same time improve the strength of the front axle case 1. Its feature is that a steering cylinder 11 is arranged parallel to the front axle case 1, and a piston rod 12 protruding left and right from the cylinder 11 is connected to the knuckle arms 14 of the left and right front wheels via tie rods 13.
In a power steering device for a vehicle connected to
5 in the left-right direction, and the cylinder 1 is arranged so that at least a part of the cylinder 11 enters the recess 15
1 is provided close to the front axle case 1.

[Effect of idea]

In the present invention, since the cylinder 11 is provided close to the front axle case 1 so that at least a part of the cylinder 11 enters the recess 15, the tie rod 1
The steering force can be efficiently transmitted from 3 to the knuckle arm 14 side. Furthermore, since the front axle case 1 has a recess 15 formed in its longitudinal direction, the recess 15 functions as a kind of rib, improving the strength. Therefore, even when the front axle case 1 is cast, it can be made thinner and therefore lighter.

〔Example〕

The invention will now be described in detail with reference to the illustrated embodiments.

Components with the same names as those in the conventional example are given the same reference numerals, and explanations thereof will be omitted.

As shown in FIGS. 1 to 4, the front axle case 1 is configured to be thick at the center because it houses the front wheel differential device 6. As shown in FIGS. A recess 15 is formed in the left-right direction on the front side of the front axle case 1, and the recess 15 is recessed toward the inner rear side.
the cylinder 11 so that it is at least partially within the cylinder 11;
is provided adjacent to the front axle case 1. The cylinder 11 has a wide mounting bracket 1 in the center.
6. Narrow mounting brackets 17 are provided at both left and right ends, and these mounting brackets 16, 1
It is removably attached to the front axle case 1 via bolts 18 and 19 via a bolt 7. A central wide mounting bracket 16 is provided with a center shaft 2. Note that the front wheel differential device 6 is connected to the differential yoke shaft 2.
0 to the front wheel 10 via a transmission mechanism in the gear case 7 and the front wheel 9.

In the above configuration, when the piston rod 12 is actuated in the left and right direction by the cylinder 11, the front wheel 10 is moved through the tie rod 13 and the knuckle arm 14.
moves around king pin 8, allowing steering. In this case, since the cylinder 11 is sufficiently close to the center of the front axle case 1, the directionality of the tie rod 13 with respect to the connection point of the knuckle arm 14 is always good, and the steering force on the cylinder 11 side is transferred reliably and efficiently through the tie rod 13. can be transmitted to the front wheel 10 side. Therefore, steering can be performed quickly without deformation such as bending of the tie rod 13.

Further, the strength of the front axle case 1 is increased by the rib-like function of the recess 15, and it can be made of thin-walled casting. By connecting the cylinder 11 and the front axle case 1 via the mounting brackets 16 and 17, one also serves as reinforcement for the other, improving strength.

In the embodiment, the recess 15 is formed on the front side of the front axle case 1, but it may be provided on the rear side.

6 and 7 show a power steering device for a tractor, in which a steering arm 21 is used. The steering arm 21 is connected to the support plate 23 of the front axle frame 4 via the support shaft 22.
A tie rod 24 is connected to the tip of the arm 21 from the left and right sides. The cylinder 25 has upper and lower shaft portions 26, 27, and the shaft portions 26, 2
7 is held by cylinder brackets 28 and 29 mounted on the inside of the front axle frame 4.
Note that the piston rod 30 of the cylinder 25 is connected to the steering arm 21. A washer 31 is interposed between the cylinder 25 and the bracket 29, and a predetermined gap is provided between the cylinder 25 and the bracket 28. Bracket 2
Sealing materials 32 and 33 are installed on the opening edge sides of cylinders 8 and 29 on the cylinder 25 side. The lower bracket 29 is provided with a joint 35 with a nipple 34 for injecting grease into the shaft portion 27 side, and this joint 35 is connected to a joint 37 of the bracket 28 via a hose 36. The joint 37 is designed so that grease can be injected into the shaft portion 26 side within the bracket 28.

Therefore, in this way, grease can be injected into both from the nipple 34 provided on the lower bracket 29, and even when other equipment is on the front axle frame 4, grease can be easily filled. is possible.

[Brief explanation of drawings]

Figure 1 is a plan view showing one embodiment of the present invention;
The figure is a front view of the same, FIG. 3 is a cross-sectional side view of the central part, FIG. 4 is a cross-sectional view of the end side, FIG. 5 is a plan view showing the conventional example, and FIG. 6 is a different steering device. The plan view shown in FIG. 7 is a sectional view of the same. 1...Front axle case, 4...Front axle frame,
9...Front wheel case, 10...Front wheel, 11...Cylinder, 12...Piston rod, 13...Tie rod, 14...Knuckle arm, 15...Recess.

Claims (1)

[Scope of utility model registration request] In a power steering system for a vehicle, a steering cylinder 11 is arranged parallel to a front axle case 1, and a piston rod 12 protruding left and right from the cylinder 11 is connected to knuckle arms 14 of the left and right front wheels via tie rods 13. 1, a recess 15 that recesses inward is formed in the left-right direction, and the cylinder 11 is provided close to the front axle case 1 so that at least a part of the cylinder 11 enters the recess 15. Power steering device for vehicles.