JPH055107Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a maximum steering angle regulating device for a vehicle such as a tractor.

(Prior technology) For front-wheel drive type tractors,
As shown in No. 58953 (see Japanese Utility Model Publication No. 170268/1983), a fixed case is flange-bonded to the side end of the front axle case containing the front axle, and the fixed case is
The movable case is equipped with a movable case that can be steered around the king pin along with the front wheels, the fixed case and the movable case have a built-in transmission mechanism that transmits power from the front axle to the front wheels, and the fixed case has a transmission mechanism that transmits power from the front axle to the front wheels. A movable case with a built-in mechanism is provided so that it can be freely steered around the kingpin along with the front wheels, a stopper abutment part is provided on the fixed case, and the movable case makes contact with the stopper abutment part to regulate the maximum steering angle of the front wheels. Some have stoppers attached with mounting bolts.

By the way, if the front wheel tread is adjustable, the narrower the front wheel tread is, the smaller the maximum steering angle of the front wheel needs to be, in order to avoid contact between the front wheel and exterior parts. So,
The maximum steering angle that could be regulated was only one, and it was not possible to accommodate changes in the tread of the front wheels.

(Problem that the invention aims to solve) Therefore, stoppers that can accommodate changes in the tread of the front wheels have been considered, but there is still no stopper that can easily accommodate changes in the tread of the front wheels, even with a simple structure. That is the reality.

An object of the present invention is to provide a maximum steering angle regulating device for a vehicle that can solve the above problems.

(Means for Solving the Problems) In order to achieve the above object, the present invention is characterized in that a transmission for transmitting power from the axle to the wheels 18 is provided at the outer end of the axle case 6 containing the axle. A movable case 11 containing a mechanism is provided so as to be freely steerable around a kingpin together with wheels 18, a stopper abutting portion 33 is provided on one side of the axle case 6 and the movable case 11, and a stopper 27 is freely released on the other side with a mounting bolt 30. The stopper 27 is provided with a stopper part that comes into contact with the stopper contact part 33 to regulate the maximum steering angle of the front wheels 18, and the stopper 27 has a stopper part in the form of an inclined surface with different angles of inclination. 31 and 32 are arranged circumferentially around the mounting bolt 30, and the stopper 27
By rotating around the mounting bolt 30, each stopper part 31, 32 can be brought into surface contact with the stopper abutting part 33, respectively, and the maximum steering angles A, B of the front wheels 18 regulated by each stopper part 31, 32 are different. It is at the point where

(Function) If the front wheel 18 has a wide tread, the first stopper portion 31 of the stopper 27 is made to correspond to the stopper contact portion 33 of the fixed case 8, regardless of the present invention. As a result, when steering the front wheels 18, as shown in FIG. The maximum steering angle A is large.

Next, when the tread of the front end 18 is narrowed, the maximum steering angle of the front wheel 18 must be reduced in order to avoid contact between the front wheel 18 and exterior parts when the front wheel 18 is steered.

In that case, the mounting bolt 30 of the stopper 27
is loosened so that the second stopper part 32 of the stopper 27 corresponds to the stopper abutment part 33, and thereby, as shown in FIG. 4, the maximum steering angle B of the front wheels 18 can be made small.

The first and second stopper portions 31 and 32 are formed into inclined surfaces, and are in surface contact with the stopper contact portion 33, so that even if the contact is repeated, deformation is extremely small.

(Example) Hereinafter, an example in which the present invention is applied to a tractor will be described based on the drawings of FIGS. 1 to 6.
In the figures and FIG. 3, 2 is a front axle frame that projects forward from the engine, and a pair of left and right side plates 3.
has.

A front wheel differential case 4 is disposed below the front axle frame 2, and is supported by the front axle frame 2 via a pair of front and rear mounting devices 5 so as to be rotatable about an axis in the front and rear direction. A front wheel differential device to which power is transmitted from the transmission case side is provided inside the differential case 4, and front axles extend from the device to both sides.

6 is a pair of left and right front axle cases, and differential case 4
It extends from both sides and contains the front axle. The front axle case 6 and the front axle are telescopically adjustable, and the tread of the front wheel 18 is adjustable.

A fixed case 8 is detachably connected to the front axle case 6.

A movable case 11 is composed of a case body 12 and a lid body 13. The case body 12 includes a bowl-shaped portion 14 located on the outer side of the fixed case 8, and a bowl-shaped portion 1.
4 and a projecting portion 15 projecting from the bottom of the fixed case 8 to the lower side of the fixed case 8. The bowl-shaped portion 14 opens outward, and a lid 13 removably covers the opening.

A front wheel hub shaft 16 is attached to the bowl-shaped portion 14 and the lid body 13.
is rotatably supported, and a tire 19 of a front wheel 18 is provided on a front wheel hub shaft 16 via a disk 17.

A bevel transmission mechanism for transmitting power from the front axle to the front wheel hub axle 16 is provided in the fixed case 8 and the movable case 11, and a king pin of the transmission mechanism is vertically installed in the fixed case 8 and the overhang 15. .

Reference numeral 21 denotes a steering arm, the outer end of which is fixed to the upper surface of the bowl-shaped part 14, the middle part of which is rotatably supported on the upper surface of the fixed case 8, and the inner end of which is connected to the steering handle via a drag link 22, etc. The front wheel 18 can be steered together with the movable case 11 around the axis 23 of the king pin by rotating the handle.

Reference numeral 24 denotes a tie rod that interlocks the left and right movable cases 11, and its side ends are connected to a bracket 25 that projects rearward from the projecting portion 15.

Reference numeral 27 denotes a stopper, as shown in FIGS. 5 and 6, which is shaped by cutting off a radially symmetrical part of a cylindrical body with a bottom, and as shown in FIGS. Reference numeral 28 denotes a mounting seat 2 that protrudes inward from the rear upper part of the inner and outer surface of the bowl-shaped portion 14.
9, a single mounting bolt 3 concentric with the stopper 27
0, it is detachably mounted so as to be rotatably adjustable around the axis, and vertically protrudes inward from the mounting seat 29. The head of the bolt 30 is fitted inside the stopper 27. A first stopper part 31 is formed on one side in the radial direction of the distal end surface of the stopper 27, and a second stopper part 32 is formed on the other side. The maximum steering angle of the front wheels 18 is restricted by making contact with the front wheels 18. By the way, each of the stopper parts 31 and 32 is inclined with respect to a plane 34 perpendicular to the axis of the stopper 27 so as to come into surface contact with the stopper contact part 33, and the first stopper part 3
The inclination angle α of the second stopper portion 32 with respect to the surface 34 is smaller than the inclination angle β of the second stopper portion 32 with respect to the surface 34,
The maximum steering angle A of the front wheels 18 regulated by the first stopper part 31 is larger than the maximum steering angle B of the front wheels 18 regulated by the second stopper part 32.

In the embodiment, the number of stopper portions of the stopper is two, but it may be three or more. Alternatively, the stopper may be attached to the front axle case side.

(Effects of the invention) As detailed above, according to the invention, the stopper portions 31 and 32 formed on the stopper 27 have sloped surface shapes with different inclination angles, and the stopper contact portion 33
Since it is possible to make surface contact with the stopper contact portion 33, it comes into contact with the stopper contact portion 33 with low surface pressure, and even if the contact is repeated, there is extremely little deformation, and the maximum steering angles A and B of the front wheels 18 can be set accurately for a long period of time. You can also use the stopper 27
You can change and set the maximum steering angle to A or B by simply rotating it around the mounting bolt 30.
It is easy to change the angle, and the maximum steering angles A and B after the change can be set accurately.

[Brief explanation of drawings]

1 to 7 show an embodiment of the present invention.
Fig. 1 is a partially sectional plan view of the main part, Fig. 2 is a partially sectional rear view, Fig. 3 is a partially sectional plan view, Fig. 4 is a partially sectional plan view of the main part showing a state different from that of Fig. 1, Fig. 5 is a side view of the stopper, and Fig. 6 is a plan view of the same. 6: front axle case, 8, 11: fixed and movable case, 18: front wheel (wheel), 27: stopper, 30: mounting bolt, 31, 32: first and second axle members,
Second stopper contact portion.

Claims (1)

[Claims for Utility Model Registration] A movable case 11 containing a transmission mechanism for transmitting power from the axle to the wheels 18 is provided at the outer end of the axle case 6 containing the axle so that the movable case 11 can be freely steered around the king pin together with the wheels 18. A stopper abutting portion 33 is provided on one side of the axle case 6 and the movable case 11, and a stopper 27 is releasably attached to the other side with a mounting bolt 30.
3 to restrict the maximum steering angle of the front wheels 18, the stopper 27 has stopper parts 31 and 32 in the form of inclined surfaces with different angles of inclination extending around the mounting bolt 30. Multiple locations are provided in the direction, and the stopper 27
By rotating around the mounting bolt 30, each stopper part 31, 32 can be brought into surface contact with the stopper contact part 33, respectively, and the maximum steering angles A, B of the front wheels 18 regulated by each stopper part 31, 32 are different. A maximum steering angle regulating device for a vehicle characterized by a fixed angle.