JPS6112295Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a steering device for a vehicle.

More specifically, it supports a plate cam that is rotated by the operation of the steering shaft, a roller that is engaged with the plate cam and that is caused to make a tracing motion by the rotation of the plate cam, and drives a driven shaft to manipulate the steering member. In the steering device, the plate cam, its driving shaft, roller, supporting arm, and driven shaft are housed in a box filled with protective fluid, and the driving shaft and driven shaft are This invention relates to a steering device for a vehicle that is used as a support shaft for a box to ensure smooth operation of the steering device, protect the steering device, and improve its lifespan and durability.

The present applicant has previously provided a steering device that uses a plate cam and rollers and is suitable for use mainly in bar-handle type light vehicles.

This consists of a plate cam that is rotationally driven by the steering shaft, and a roller that abuts and engages the periphery of the cam and is supported by the arm.The rotation of the cam causes the arm to swing via the roller, and is connected to the plate cam. It drives the tie rod and knuckle arm, and steers the steering wheels with a reduction ratio.

By the way, cams and rollers need to maintain high manufacturing and assembly accuracy. On the other hand, if cams, rollers, and peripheral equipment are installed exposed outside, the engagement surfaces of the cams and rollers may be damaged. There is a risk of dust, pebbles, etc. entering, and flying stones etc. may damage the cam while driving.
There is a risk of hitting the rollers, and as a result, even if accuracy is maintained during temporary fabrication and assembly, foreign objects may get caught in the engagement surface and impede smooth operation, or damage the cams and rollers, resulting in inaccurate There is a risk that the reduction ratio will not be obtained or that the cam, rollers, and peripheral equipment may be damaged.

The present inventors devised this invention in order to improve the above-mentioned problems of this type of steering device, and the purpose thereof is to:
The plate cam, its operation drive shaft, roller, its support arm, and driven shaft are housed in a box filled with oil or the like, and the drive shaft and driven shaft are used as support shafts of the box. An object of the present invention is to provide a steering device for a vehicle that is capable of smooth operation, protection, longevity, and durability of the steering device.

Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIGS. 1 and 2 show a four-wheeled vehicle as a vehicle in which the present invention is implemented, and the vehicle 1 is equipped with a press-molded frame 2 that is approximately the same width as the passenger, and the front portion 2a of the frame 2 is The floor 2b is high and the middle part is low, forming a footrest floor 2b, and the middle part to the rear part 2c extend diagonally upward and rearward.

Suspension arms 3 made of leaf springs are horizontally suspended on the front part 2a of the frame 2 in the left and right direction so as to sandwich the front part vertically in parallel, and a knuckle arm 4 is provided with vertical pins between the lateral protrusions of the front part of the frame at both ends. 6, and the knuckle arm 4 supports left and right front wheels 5, 5, which are steering wheels. The extending portion 4a of the knuckle arm 4 is pivotally connected to the ends of the left and right tie rods 8 via a joint 7, and when the tie rods 8 are pulled or pushed, the knuckle arm 4 is swung about the pin 6 as a fulcrum and is supported by this. Steering the wheels 5 to the right or left.

On the rear part 2c of the frame 2, inverted L-shaped stays 9, 9 are arranged on the left and right, on which a sheet 10 is placed, and a firing material tank 11 is mounted below between the stays 9, 9. Further, an engine (not shown) is mounted below the rear part 2c, and rear wheels 12, 12 are arranged on the left and right sides of the engine to serve as a drive shaft.The axle 13 is connected to the engine transmission case, and the wheel 1
The inner sides of 2 and 12 are supported by the rear ends of leaf springs 14 and 14 extending rearward from the lower left and right sides of the seat 10,
It constitutes a suspension shock absorber.

A steering shaft 15 is installed on the front part 2a of the frame 2 via a column 16 which is an outer tube body, and the upper end of the shaft 15 projects above the column 16 and is provided with a bar handle 17, and the column 16 has an inverted U shape. It is supported by a mold stay 18 at the front of the frame. Inside or under the front part 2a of the frame 2, a closed type deceleration box 19 consisting of an upper and lower halves of a case 19a and 19b is disposed.
is supported by a frame, and FIGS. 3 and 4 show only the main parts of the mechanism, and the frame is not shown for convenience of explanation.

A drive shaft 20 connected to the lower part of the shaft 15 runs vertically inside the box, and the upper and lower parts 20 of the shaft 20
a, 20b are supported by bearing portions 19c, 19d provided in parts of the upper and lower cases 19a, 19b, and are rotatable, with the intermediate portion 20c facing into the closed space S within the box 19. In the middle part 20c of the shaft 20 facing into the space S, plate cams 21a, 21a, which are vertically spaced apart and have a symmetrical shape, are fixed at a common part to form the cam 21. Cam edges 21b, 21b are formed which are symmetrical at each point. On the other hand, a driven shaft 22 is installed vertically in the space S of the box 19, and its upper and lower parts 22a and 22b are supported by other bearings 19c and 19f formed in parts of the upper and lower cases 19a and 19b, and The lower part of the shaft 22 extends downwardly from the lower case 19b, and the lower part of the shaft 22 extends downward from the middle part 2.
2c faces into the space S. The driven shaft 22 and the drive shaft 20 maintain the assembled state of the upper and lower cases 19a and 19b, that is, function as a support shaft.

The bases of support arms 23a, 23a are connected to the intermediate portion 22c of the driven shaft 22 in a substantially V-shape plan, and the arms are vertically spaced apart, and two rollers 25, 25 are attached to both ends via pins 24. are pivotally installed, and each roller 25, 25 is attached to the cam edge 2 of each plate cam 21a, 21a.
1b, 21b at symmetrical positions, and each roller 25 has an inner/outer dual cylinder body 25a, 2 made of steel.
5b and a flexible elastic body 25c made of rubber or the like interposed therebetween, and is configured to absorb manufacturing and assembly errors of the cam and roller.

A drive plate 28 is fixed to the drooping extending end 22d of the driven shaft 22, and the base ends of the left and right tie rods 8, 8 mentioned above are connected to the joint 2 at both extending ends of the drive plate 28.
It is pivoted at 9.

In addition, 26 and 26 in the drawing are the end walls 19 of the box 19.
A stopper installed vertically between the support arm 23a and the support arm 23a prevents the roller from being crushed between the cam and the end wall at the limit of arm swing.
A stopper 30 is attached to the extension part 4a of the knuckle arm 4, and the edge 3b of the lower part 3a of the suspension arm 3 is attached to the extension part 4a of the knuckle arm 4.
This is a stopper made of rubber or the like that regulates the swing steering angle when the steering wheel is turned.

The above shafts 20, 22, cam 21, roller 25,
A space S of a box 19 in which the stoppers 26, 27 and the support arm 23a are sealed is filled with oil or the like.

In the above, the steering operation of the handle 17 is performed via the steering shaft 15 on the integrated drive shaft 2.
0, the cam 21 rotates to the right or left,
Support arms 23a, 23a in contact with this by two rollers 25, 25 swing to the right or left, and rollers 25, 25 roll around pin 24 as a fulcrum, following the cam edges 21b, 21b. The swinging motion of the support arm 23a is output to the drive plate 28 via the driven shaft 22,
This is driven to the right or left, pulling or pushing the tie rods 8, 8, swinging the knuckle arms 4, 4, and steering the wheels 5, 5.

As is clear from the above, according to the present invention, the cams, rollers, support arms, etc. that make up the steering reduction section are immersed in oil sealed in a sealed box, so that dust and pebbles do not enter the box. Also, since it is protected by oil, pebbles caused by driving will not enter or collide with the steering section, and it will definitely prevent foreign objects from entering or getting caught between the cam and rollers. In addition to preventing and protecting this, ensuring smooth operation and improving lifespan and durability, each mechanical part and moving part is immersed in oil.
This acts as a lubricant and facilitates smooth operation.
In addition, it suppresses wear of the engaging parts and moving parts, furthermore suppresses heat generation, and significantly improves the lifespan and durability of each part.In addition, the box is also supported using both drive and driven shafts to keep the box airtight. It has many advantages, such as ensuring that

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a side view of the vehicle, FIG. 2 is a plan view of the vehicle, FIG. 3 is a plan view showing the inside of the steering device, and FIG. The figure is a sectional view taken along the line 4-4 in FIG. In the drawing, 15 is a steering shaft, 19 is a box, 20 is a drive shaft, 21 is a cam, 25 is a roller, 23a is an arm, and 22 is a driven shaft.

Claims (1)

[Scope of utility model registration request] It supports a plate cam that is rotated by the operation of the steering shaft, and a roller that is engaged with the plate cam and that is caused to make a tracing motion by the rotation of the plate cam, and drives a driven shaft to steer the steering member. In a steering device for a vehicle, the plate cam, its drive shaft, roller, its support arm, and driven shaft are housed in a box that integrates a split case, and the drive shaft and driven shaft are connected to the support shaft of the split case. A steering device for a vehicle, characterized in that the box is installed between the cases, and a protective fluid is filled and sealed in the box.