JPH0321334Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a front wheel steering device for wheels.

<Conventional technology> As a front wheel steering device for a tractor, etc., a
A steering actuating body that slides back and forth in the lateral direction is provided parallel to this, and tie rods are connected to both ends of this actuating body via ball joints, and each tie rod is connected to each front wheel supported at both ends of the front axle. The one connected to the knuckle arm via a tie rod end was developed in 1986.
This is proposed in Publication No. 135357.

This is very effective because the operating body is on the front axle side, so even when the front axle swings around the center axis, the swing does not change the turning angle of the front wheels.

<Problems to be solved by the invention> However, with this type of device, the operating body becomes longer in the lateral direction and the tie rod becomes shorter accordingly, so when trying to adjust the front wheel tread, the adjustment amount becomes There were some slight drawbacks. Furthermore, in order to adjust the toe-in of the front wheel, the tie rod is provided with a screw-type fine adjustment section, but in the past, the tie rod end had to be removed from the knuckle arm in order to be able to rotate, making handling very complicated.

<Means for Solving the Problems> The present invention is intended to solve these conventional problems, and as a specific means, a reciprocating slide is installed on the front axle in the lateral direction parallel to the front axle. A steering operating body that moves is provided, tie rods are connected to both ends of this operating body via ball joints, and each tie rod is connected to
In a vehicle's front wheel steering system, which is connected via a tie rod end to the knuckle arms of each front wheel supported at both ends of the front axle, the tie rod consists of an axle rod connected to a ball joint, and a shaft rod that can be coarsely adjusted in the direction of expansion and contraction. The ball joint has a cylindrical rod that is removably fitted on the outside, and a threaded rod that is screwed to the cylindrical rod so as to be adjustable in the axial direction and connected to the tie rod end, and a protective cover that covers the open part of the ball joint. It can be rotated and fixed to the shaft rod.

<Function> The shaft rod 23 and cylindrical rod 24 of the tie rod 20 are removable, and the length of the tie rod 20 can be increased by interposing a spacer 42 between them in accordance with the front wheel tread. When adjusting toe-in, use screw rod 26.
and the cylinder rod 24. In this case, after removing the clip 31 and releasing the fixation of the protective cover 29 to the shaft rod 23, the tie rod 20 may be rotated about its axis.

<Embodiment> The present invention will be described in detail below with reference to the illustrated embodiment. The drawings illustrate the case of an agricultural tractor;
In Figures 2 and 3, 1 is a front axle frame, and a pair of front and rear axle brackets 2 and 3 are attached to this.
A support cylinder 7 of a front axle 6 is supported via the center shafts 4 and 5. The front axle 6 consists of a front axle main body 8 and a movable axle 9 that is telescopically fitted into the left and right ends of the main body 8, and a support cylinder 7 is fixed to the front axle body 8. The movable axle 9 can be expanded and contracted in a plurality of stages according to the adjustment hole 10 with respect to the front axle main body 8, and is fixed with a bolt 11. A front wheel 13 is supported at the outer end of the movable axle 9 so as to be steerable around the king pin 12, and the front wheel 13 is operated around the king pin 12 by a knuckle arm 14.

15 is a power steering device, cylinder 1
6 and the piston rod (actuating body) inserted into it
17, the cylinder 16 is mounted on a mounting plate 18 provided on the front side of the front axle body 8 so as to be parallel to the front axle 6, and has U bolts 1 at both ends.
9 is fixed to the mounting plate 18. Therefore,
The piston rod 17 is slidable back and forth parallel to the front axle 6 by the operation of a valve linked to a handle (not shown). A tie rod 20 is connected to the outer end of the piston rod 17 via a ball joint 21 and to the knuckle arm 14 via a tie rod end 22, respectively. As shown in FIGS. 1 and 4, the tie rod 20 includes a round rod-shaped shaft rod 23, a cylindrical rod 24 that is removably fitted onto the rod, and a threaded rod that is screwed into a nut 25 fixed to the cylindrical rod 24. It consists of 26. The shaft rod 23 is connected to the piston rod 17 via the ball joint 21, which consists of a holder 27 and a spherical portion 28 rotatably fitted and held within the holder 27. Note that the holder 27 is provided on the piston rod 17, and the spherical portion 28 is provided on the shaft rod 23, respectively. A protective cover 29 made of rubber or the like is fixed to the open end side of the holder 27 by a ring 30, and this protective cover 29 is fitted onto the shaft rod 23 and rotated by a wrap-type clip 31 made of a spring. It is fixedly fixed.
The shaft rod 23 has engaging portions 32, 3 at both ends in the longitudinal direction.
3 is formed, and the shaft rod 23 and the cylindrical rod 24 can be adjusted to expand and contract at two positions of the engaging portions 32 and 33 by U-shaped fastening fittings 34 and bolts 35. The tie rod end 22 has a holder 36,
A taper bolt 38 with a spherical portion 37 is held therein, and the taper bolt 38 is fitted into the knuckle arm 14 and fixed with a nut 39. Further, the holder 36 is provided integrally with the screw rod 26. 40 is a lock nut, and 41 is a protective cover.

A spacer 42 can be interposed between the shaft rod 23 and the cylinder rod 24 of the tie rod 20, as shown in FIG. The spacer 42 is a shaft rod 4 similar to the shaft rod 23.
3 and a cylindrical rod 44 similar to the cylindrical rod 24. The fittings 34 and bolts 35 allow expansion and contraction to be adjusted to two positions. In addition, shaft 4
3 are formed with engaging portions 47 and 48.

Reference numeral 49 denotes a protection plate that protects the power steering device 15 from the front side, and is fixed to the lower surface of the front axle body 6 and has a protection portion 50 that stands upward from the front edge. An extension plate 51 having substantially the same shape is attached to the protection plate 49 so as to be removable and removable. A plurality of attachment holes 52 are laterally formed in the protection plate 49, and the extension plate 51 can be fixed to the protection plate 49 by bolts 53 which can be inserted into and removed from the attachment holes 52. In addition, a protective plate 4 is attached to the bent portion 54 at the tip of the extension plate 51 as shown in FIG.
An elastic piece 55 that pinches the end of the elastic piece 55 when placed in the
is provided.

Next, the operation of the above configuration will be explained. FIG. 2 shows the state when the tread of the front wheel 13 is minimized, and at this time the tie rod 20 is in the state shown in FIG.

Therefore, when extending the movable axle 9 outward from the front axle body 8 to increase the tread of the front wheel 13, as shown in the imaginary line in FIG.
Since the cylindrical rod 24 and the cylindrical rod 24 are removable, a spacer 42 is interposed in the tie rod 20 as shown in FIG. In this case, for example, after separating the shaft rod 23 and the cylinder rod 24, the piston rod 17 of the steering device 15 is slid to the right, and the shaft rod 23 and cylinder rod 24 are separated as required for interposing the spacer 42. A spacer 42 is interposed between the two, as shown in FIG.
Fix each with. Incidentally, by selecting the engagement position of each bolt 35, 46 with respect to the engagement part 47, 48, 32, 33, coarse adjustment can be made in two stages at each position.

After the rough adjustment is completed in this manner, the screwing position of the screw rod 26 with respect to the nut 25 is then changed to perform fine adjustment so as to obtain a predetermined toe-in. At this time,
The clip 31 is removed from the protective cover 29 to release the protective cover 29 from being fixed to the shaft rod 23. Next, by gripping the cylindrical rod 24 or 44 and rotating it around the axis, the nut 25 moves forward and backward relative to the threaded rod 26 in the axial direction. When a predetermined toe-in is achieved, the lock nut 40 is tightened and the protective cover 29 is fixed to the shaft rod 23 with the clip 31.

At the time of tread adjustment, the extension plate 51 is made to protrude from the protection plate 49 and fixed in accordance with the amount of protrusion of the movable axle 9. In this way, the piston rod 17, tie rod 20, etc. of the steering device 15 can be protected by the protection plate 49 and the extension plate 51.
It can prevent grass etc. from getting entangled.

In the above embodiment, a type in which the front wheels 13 are not driven is shown, but a front wheel drive type can also be implemented in the same manner.

<Effects of the invention> According to the invention, the shaft rod and cylindrical rod of the tie rod can be roughly adjusted and are also detachable, so a spacer can be inserted between them as necessary. Even though the length of the tie rod is small, the tread adjustment of the front wheel can be made large. In addition, since the protective cover of the ball joint can be released and fixed to the shaft rod, by releasing it, the tie rod can be rotated, and the screw rod can be moved between the screw rod and the cylindrical rod without removing the tie rod end from the knuckle arm. can be finely adjusted, making it easy to adjust toe-in.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Figure 1 is a sectional view of the main part, Figure 2 is a sectional plan view of the front axle, and Figure 3 is a sectional view of the front axle.
4 is a cross-sectional view taken along the line -- in FIG. 1, FIG. 5 is a cross-sectional view of the end of the extension plate, and FIG. 6 is a cross-sectional view of the tie rod with a spacer interposed therebetween. 6...Front axle, 13...Front wheel, 14...Natsukuru arm, 15...Power steering device, 1
7... Piston rod (operating body), 20... Tie rod, 21... Ball joint, 22... Tie rod end, 23, 43... Shaft rod, 24, 44... Cylindrical rod, 26... Screw rod, 29... protective cover.

Claims (1)

[Scope of utility model registration request] A steering actuating body is provided on the front axle and slides back and forth in the lateral direction parallel to the steering actuating body, tie rods are connected to both ends of this actuating body via ball joints, and each tie rod is supported on both ends of the front axle. In a vehicle's front wheel steering system, which is connected to the knuckle arm of each front wheel via a tie rod end, the tie rod has an axle rod connected to a ball joint, and a removable external fitting on the axle rod that can be roughly adjusted in the direction of expansion and contraction. a cylindrical rod, and a threaded rod that is screwed into the cylindrical rod in an axially adjustable manner and connected to a tie rod end, and a protective cover that covers the open portion of the ball joint is rotated with respect to the shaft rod. A vehicle front wheel steering device characterized by being movable and fixed.