JPH0627432U - Steering device - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a steering device, and an object thereof is to make the steering operation force constant with respect to the turning angle of the tire. A wheel-side shaft having a steering wheel attached thereto and a tire-side shaft to which a tire is attached are provided eccentrically at a connecting end, a convex pulley having an inclined groove is provided on the wheel-side shaft, and the tire-side shaft is provided with the same as the inclined groove. A concave pulley having a directional directional groove was provided, and the convex pulley and the concave pulley were connected by a belt.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a steering device that rotates a steering wheel to change the direction of tires of a vehicle to change the traveling direction of the vehicle.

[0002]

[Prior art]

 In a conventional steering device, for example, as shown in FIG. 3, a rotatable steering wheel 1 is installed at a position where it can be operated from a driver's seat of a vehicle, and a gear 3 is attached to a wheel side shaft 2 rotated by the steering wheel 1. The belt wheel 6 is attached to the lower end of the tire-side shaft 5 having the gear 4 meshing with the gear 3 attached to the upper end.

A belt 9 is installed between the belt wheel 6 and the belt wheel 8 of the deflection shaft 7 of the deflection device for changing the direction of the tire. When the steering wheel 1 is rotated, the tire side shaft 5 is rotated. The turning shaft 7 is rotated via the turning shaft 7 to change the direction of the tire.

[0004]

[Problems to be solved by the device]

 The steering operation force of such a steering device is not constant with respect to the turning angle of the tire, and as shown in FIG. 4, the operating force is proportional to the torque that the tire lifts as the turning angle increases. And then it is getting bigger.

Therefore, the steering angle gradually becomes heavier as the steering angle becomes larger, and becomes heavier enough to feel pain, especially at a low speed. In addition, there are some vehicle models that cannot solve this problem even if power steering is used.Furthermore, the gears in the gearbox that convert the rotation of the steering wheel into the steering angle of the tires have been made variable. However, this tendency is not completely corrected.

An object of the present invention is to solve the above-mentioned problems in the conventional steering device and to make the steering operation force constant with respect to the turning angle of the tire.

[0007]

[Means for Solving the Problems]

 According to the present invention, a wheel-side shaft having a steering wheel attached thereto and a tire-side shaft to which a tire is attached are provided eccentrically at a connection end, a convex pulley having an inclined groove is provided at the wheel-side shaft, and the tire-side shaft is provided with the inclined shaft. It is characterized in that a concave body pulley having an inclined groove in the same direction as the groove is provided, and the convex body pulley and the concave body pulley are connected by a belt.

[0008]

[Action]

 In the steering device of the present invention, the gear ratio depending on the diameter ratio of the pulley gradually increases as the steering wheel is rotated from the center to the left and right, so that the steering operation force becomes constant with respect to the turning angle of the tire, and a large amount of steering is performed. It doesn't get heavy when turned.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to FIG. The steering device of this embodiment is used in place of the gears 3 and 4 provided between the wheel shaft 2 and the tire shaft 5 of the conventional steering device shown in FIG.

The wheel-side shaft 2 and the tire-side shaft 5 are installed with their axes separated from each other by an appropriate distance, and the wheel-side shaft 2 is formed with a spiral inclined groove 10 a in the central portion. A drum-shaped convex pulley 10 having a bulge is attached.

Further, the tire side shaft 5 is formed with a spiral inclined groove 11a that is inclined in the same direction as the inclined groove 10a of the convex pulley 10 and has a concave center portion. A concave body pulley 11 in the shape of () is attached, and a belt 12 is installed between the inclined groove 10 a of the convex body pulley 10 and the inclined groove 11 a of the concave body pulley 11.

The belt 12 is erected so as to straddle the inclined grooves 10a, 11a at the center of the convex pulley 10 and the concave pulley 11 in the vertical direction. When the belt 2 is rotated, the belt 12 moves upward or downward along the inclined groove 10a.

Then, the rotation of the convex pulley 10 is transmitted to the concave pulley 11, and the concave pulley 11 also rotates, but the inclination direction of the inclined groove 11a of the concave pulley 11 is the same as that of the inclined groove 10a. Since the belt 12 moves with respect to the convex sheave 10, the belt 12 moves upward or downward with respect to the concave sheave 11.

As described above, the convex sheave 10 has a maximum diameter at the center and a smaller diameter toward both ends, while the concave sheave 11 has a minimum diameter at the center and a larger diameter toward both ends. Therefore, the gear ratio between the belt 12 and the belt 12 increases as the suspension position of the belt 12 changes.

Therefore, the rotation angle of the tire-side shaft 5 with respect to the rotation angle of the wheel-side shaft 2 is gradually reduced, and the steering force of the steering wheel can be reduced according to the ratio of the reduction.

The swelling shape of the convex sheave 10 and the depression of the concave sheave 11 are set so that this smaller proportion may be offset by the larger proportion as the steering direction of the tire deviates from straight ahead. By determining the shape, it is possible to prevent the operating force of the steering wheel 1 from changing even if the turning angle of the tire changes.

FIG. 2 shows the gear ratios of the convex pulley 10 and the concave pulley 11 that can obtain such an operation force of the steering wheel 1. In the above-mentioned embodiment, the belt 12 is installed between the convex pulley 10 and the concave pulley 11. However, the balls are interposed between the convex pulley 10 and the concave pulley 11 to form the convex pulley 10 By transmitting the rotation of No. 1 to the concave pulley 11, the gear ratio between the two can be changed, and the same operation as in the above embodiment can be achieved.

However, in this case, the slanting grooves 10a and 11a formed in the convex sheave 10 and the concave sheave 11 need to be in opposite directions.

[0019]

[Effect of device]

 As described above, according to the present invention, the wheel-side shaft of the rotation transmitting means provided between the two shafts for converting the rotation of the steering wheel into the steering direction of the tire is formed with the inclined groove and the central portion is expanded. The drum-shaped convex pulley that sticks out is attached to the drum-shaped concave pulley that has an inclined groove on the tire side shaft and the center is recessed. A belt is installed.

Therefore, as the turning angle of the tire increases as the steering wheel rotates, the gear ratio between the pulleys changes, and the turning angle of the tire becomes smaller than the turning angle of the steering wheel. .

If this small angle is offset by the steering wheel operating force due to the larger turning angle, if the convex pulley and concave pulley are formed in the above-mentioned gear ratio, Even if the turning angle changes, the operating force of the steering wheel can be kept substantially constant.

Therefore, even when a steered angle at a low speed is large, the steering operation can be performed relatively easily.

[Brief description of drawings]

FIG. 1 is a side view of a main part of a steering device of the present invention.

FIG. 2 is a diagram showing a gear ratio with respect to a rotation angle of a steering wheel according to the above.

FIG. 3 is a perspective view of a conventional steering device.

FIG. 4 is a diagram showing an operating force with respect to a rotation angle of the steering wheel of the above.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steering wheel 2 Wheel side shaft 5 Tire side shaft 10 Convex body pulley 10a Inclined groove 11 Concave body pulley 11a Inclined groove 12 Belt

Claims (1)

[Scope of utility model registration request] 1. A wheel-side shaft having a steering wheel attached thereto and a tire-side shaft on which a tire is mounted at an end of connection are provided eccentrically, a convex pulley having an inclined groove is provided on the wheel-side shaft, and the tire-side shaft is provided with the inclination. A steering device comprising a concave pulley having an inclined groove in the same direction as the groove, and connecting the convex pulley and the concave pulley with a belt.