JPS6027734Y2 - King pin attachment device - Google Patents

Description

[Detailed description of the invention] This invention involves a device for installing the king pin, and while guaranteeing the turning angle of the front wheel, it is possible to shorten the axial length of the front axle and tie rod length, and to easily obtain toe-in. The purpose is to

Since the front wheels of a tractor are used for steering, front wheel alignment such as camber, kingpin inclination angle, caster, and toe-in is important.

In this invention, when installing the king pin on both ends of the front axle, the front axle has an oblique mounting part with the front side facing inward in the direction of vehicle movement, and by supporting the king pin on this, the king pin can be moved forward. Even if it is supported near the end of the axle, interference from the steering arm is reduced.

Hereinafter, specific examples of the present invention will be described in detail with reference to the drawings.

In FIGS. 1 and 2, 1 is a tractor, 2 is an engine, and 3 is a transmission case having a clutch housing 4, which constitutes the structure of the vehicle body.

Reference numeral 5 denotes a radiator device, and a radiator fan is driven by a wrapper 6 provided at the front of the engine crankshaft.

Reference numeral 7 denotes a pair of left and right support frames, each of which has its base supported by a plurality of ports 8 on both side walls 2a of the main body of the engine 2, and protrudes forward.

Each of the support frames 7 constitutes a front vehicle bearing stand, and a pair of front and rear support bodies 8,9 is provided at the bottom of each frame 7, and a center pin 10 is rotatable in the support bodies 8,9.

Reference numeral 11 denotes a front axle, which is shown in the figure as an adjustable type consisting of an inner tube 12 and an outer tube 13, and extends from the center pin 10 with the same length on both sides.

Reference numeral 14 denotes a king pin device, which is provided at both ends of the front axle 1 to align the front wheels, and has a pair of front wheels 15 as steering wheels, each of which is movable around the hub axle.

Reference numeral 16 denotes a steering arm, which is provided rotatably around a vertical axis 17 on the support frame 7 between the radiator device 5 and the engine 2 and at a position unevenly distributed to one side from the center of the vehicle body. One end 16a of 16 is at the top,
The other end 16b is at the lower level.

A drag ring 18 is pivotally connected to one end 16a, and a pair of left and right king pin devices 14, 1 are connected to the other end 16b.
4 are pivotally connected by tie rods 19° and 19, respectively.

Note that the length of the tie rods 19, 19 is adjustable.

In the above configuration, in the present invention, the left and right king pin devices 14
has been improved as illustrated in Figure 3 and below.
This point will be explained in detail.

Note that since the left and right king pin devices 14 have a symmetrical configuration, only one of them will be explained in the following explanation.

In the first embodiment shown in FIGS. 3 to 5, reference numeral 20 denotes a support body, which is provided at the end of the front axle 11, in the figure, at the inner tube 12, with a kingpin having an inclination angle.

This support body 20 has a plate shape, is fixed by welding, and extends downward.

The support body 20 is provided on the front axle 11 at an angle of sign θ with respect to the direction of vehicle movement X, as shown in FIG. .

This oblique posture may be achieved as long as the side on which the tie rod 19 is located faces inward.

The top and bottom of the outer end surface of the support 20 are substantially attached to the mounting portion 21.2.
2, the mounting portions 21, 22 are holes spaced apart in the height direction in the embodiment shown in FIG.

For this installation, the holes may be female threaded holes as shown in the figure, but when installing 4 each in parts 2, 1, and 22, the shaft protrudes outward, and this installation requires screwing a nut on the protruding end of the shaft. It may be something that does.

23 is a king pin, and in the first embodiment, the bub shaft 24 and the knuckle arm 25 are integrally forged.

More specifically, a bub shaft 24 is protruded downward from the center of the shaft length of the king pin 23, and a knuckle arm 25 is protruded upward, forward and outward from the bub shaft 24.

The upper and lower portions of the king pin 23 have journal portions 28 and 29 with a circular cross section via step portions 26 and 27, and the diameters of the journal portions 28 and 29 may be the same or the diameter of the lower journal portion 29 may be larger. .

Reference numeral 30.31 denotes upper and lower holding bodies having a blind hole structure, which hold the respective journal parts 28, 29 so as to be relatively rotatable via oil-impregnated bushings 32.33, oil-impregnated thrust metal 48, and sealing material 34.35. , each of the holding bodies 30, 31 has a shaft 36, 37 which is mounted correspondingly to the portion 21, 22.
The insertion holes 38 and 39 are provided therethrough.

Each holding body 30.31 is detachably attached to each attachment portion 21.22 of the support body 20 via a shaft 36.37 and an arch 40.41.

In addition, in Fig. 3, 42 is a bubble cylinder body, and a bearing 43
The front wheel is supported by a bubble shaft 24 via a disk 44, and a front wheel is attached to this bubble cylinder body 42 by a disc 44.

Reference numeral 45 denotes a reinforcing stay, which is a channel material provided between the axle 11 and the support body 20.

Reference numeral 46 denotes a positioning surface, which becomes a centering surface when cutting and polishing the bub shaft 24 when the king pin 23 is forged as described above.

Further, in FIG. 5, reference numeral 47 denotes a relief recess for the bubble shaft 24, which is used to prevent the bubble shaft 24 from coming into contact with the support body 20 during steering operation.

In the first embodiment of the present invention configured as described above, first, the lower holding body 31 is attached to the support body 20 on the shaft 37.
The journal portion 29 of the king pin 23 is fitted into the holding body 31 via the bushing 33, and the stepped portion 27 comes into contact with the upper end of the holding body 31 to support the thrust force.

After that, fit the upper holding body 30 with the bush 32 and thrust metal 48 into the journal part 28 of the king pin 23, and then attach the holding body 30 to the part 21 using the shaft 36 and nut 40. It is concluded.

It should be noted that since both the holders 30 and 31 have a blind hole structure, it is difficult to fit the journal portion 29 into the holder 31, but this can be solved by providing a through hole in the axis of the king pin 23. It can be resolved.

After the king pin 23 is attached to the axle 11 in this manner, the bubble cylinder body 42 is fitted and supported on the bubble shaft 24 so as to be relatively rotatable, and the front wheel is attached via the disc 44.

In the present invention, the king pin 23 is held by the holding bodies 30 and 31 at the top and bottom so as to be rotatable around the pin axis.
．． 31 is attached to the support 20 where the parts 21 and 22 are inclined at an angle θ with respect to the direction of travel X, so the tie rod 19 is connected to the knuckle arm 25 to apply steering force Then, the swing range of the knuckle arm 25 is
It is not restricted by the special holiday 20, and a large cutting angle can be made here.

In other words, in the conventional case where the knuckle arm was installed in the middle of the kingpin because the support was parallel to the direction of movement, the swing angle of the arm was limited by the support, but in the present invention, this There is no such fear.

In addition, in the present invention, the support body 20 is fixed to the end surface of the front axle 11 obliquely with the front side facing inward, and the knuckle arm 25 is protruded from the middle of the king pin 23 on the front side. The support body 20 has the advantage that it can be made shorter, and the front side of the support body 20 is directed inward as described above.
Since the king pin 23 is supported by the hub shaft 23 and the knob shaft 24 is provided on this pin 23, it is easy to place the tip of the hub shaft 24 on the front side, and it is easy to take toe-in here.

Furthermore, the support body 20 can be attached by attaching and detaching the holding bodies 30.31 to the parts 21.22 in the height direction, which has the advantage of increasing the ground clearance.

[Brief explanation of drawings]

Figure 1 is a cross-sectional side view of the front part of a tractor to which the present invention is applied;
FIG. 2 is a plan view with the left side omitted. 3 is a sectional view of a main part of the first embodiment of the present invention, FIG. 4 is a partial plan sectional view of FIG. 3, and FIG. 5 is a front view of only the support plate. 11...Front axle, 14...King pin device, 15...Front wheel, 20...Support, 21, 22...Mounting Part, 23...
King pin, 24... Hub axle, 25...
・Knuckle arm, 36, 37... Installation is on the shaft,
40, 41...Nut, X...Direction of travel, θ...Inclination angle.

Claims (1)

[Scope of Claim for Utility Model Registration] A kingpin is attached to the shaft end of the front axle so as to be rotatable around the vertical axis, and the shaft end of the front axle has an oblique mounting part with the front side facing inward in the direction of travel of the vehicle. A plate-shaped support is provided, and the plate-shaped support extends downward, and a kingpin rotatably supported by the mounting portion of the plate-shaped support connects the hub axle and the knuckle arm with the upper right arm. A kingpin mounting device characterized in that the kingpin protrudes forward and outward from the middle in the height direction of the kingpin.