JPH0554042U - Steering wheel drive - Google Patents

Abstract

(57) [Abstract] [Purpose] A hydraulic motor can be easily installed and removed, and a hydraulic motor and a speed reduction mechanism can be installed compactly and compactly. [Structure] A cylindrical housing 7 having an opening to the outside is integrally provided on a receiving seat 6 attached to a yoke 5, and a wheel mounting plate 13 having a tire 14 is rotatably supported on an outer peripheral surface of the housing 7. The steering wheel 2 is used, the hydraulic motor 15 is inserted and mounted in the housing 7, the drive shaft 17 is connected to the output shaft 16, and the drive shaft 17 and the wheel mounting plate 13 are connected.
The first and second reduction gear mechanisms 19, 2 over the tubular portion 13a of
Zeros are provided at intervals in the axial direction, and the rotation of the output shaft 16 can be decelerated with a large reduction ratio and transmitted to the steered wheels 2.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a device for driving steered wheels such as front wheels of a large dump truck using a hydraulic motor.

[Prior Art]

As a device for driving the steered wheels using a hydraulic motor, for example, a device disclosed in Japanese Patent Publication No. 48-42136 is known. That is, as shown in FIG. 1, a hollow drum-shaped housing b is swingably supported on a yoke a, a wheel mounting plate c is rotatably supported on the outer periphery of the hollow drum-shaped housing b, and the wheel mounting plate c is supported. A wheel d is attached to the wheel d, a hydraulic motor e is attached in the hollow drum-shaped housing b, and an output shaft f thereof is connected to the wheel mounting plate c through a compound planetary gear train g.

[0003]

[Problems to be solved by the device]

 With such a steering wheel drive device, the yoke a becomes an obstacle during mounting and removal of the hydraulic motor e, and the reduction ratio of the compound planetary gear train g is increased in order to increase the driving torque of the wheel d by the hydraulic motor e. If the value is increased, the compound planetary gear train g becomes larger, and it cannot be housed in the hollow drum-shaped housing b and the mounting space becomes large. Therefore, if the wheel d has a small diameter, it may interfere with the wheel d and cannot be mounted.

Therefore, an object of the present invention is to provide a steering wheel drive device capable of solving the above-mentioned problems.

[0005]

[Means for Solving the Problems]

 A yoke 5 is swingably supported on the vehicle body 1 in a substantially horizontal direction, a receiving seat 6 is swingably attached to the yoke 5, and a suspension cylinder 8 and a knuckle arm 9 are attached to the receiving seat 6. The receiving seat 6 is provided with a cylindrical housing 7 that is open toward the outside on the side opposite to the knuckle arm 9, and the wheel drive plate 13 is rotatably supported on the outer peripheral surface of the housing 7 and is attached to the wheel mounting plate 13. The tire 14 is attached to form the operating wheel 2, the hydraulic motor 15 is attached to the housing 7, the drive shaft 17 is connected to the output shaft 16 of the hydraulic motor 15, and the drive shaft 17 and the wheel mounting plate 13 are connected to each other. A steered-wheel drive device comprising first and second reduction gear mechanisms 19, 20 provided axially at intervals over the cylindrical portion 13a.

[0006]

[Work]

 The knuckle arm 9 does not get in the way when the hydraulic motor 15 is attached to and removed from the housing 7 of the receiving seat 6, and the work is facilitated. The rotation of the output shaft 16 of the hydraulic motor 15 is decelerated by the first and second reduction mechanisms 19 and 20 and transmitted to the steered wheels 2. Therefore, the reduction ratio of the output shaft 16 is increased to make the steered wheels 2 larger. It can be driven by torque, and since the first and second reduction mechanisms 19 and 20 are provided at intervals in the axial direction, they do not become large, and the steering wheel 2 is made large by using a small hydraulic motor 15 with a small output torque. Not only can it be driven by torque, but also the first and second reduction gear mechanisms 19, 20 can be made compact, and the hydraulic motor 15 and the first and second reduction gear mechanisms 19, 20 can be installed compactly, and even for small diameter steering wheels 2. It can be used.

[0007]

【Example】

 As shown in FIG. 2, a steering wheel 2 is attached to a front portion of a vehicle body 1, a driving wheel 3 is attached to a rear portion thereof, and a vessel 4 is attached to the vehicle body 1 so as to be capable of being lifted and lowered. As shown in FIG. 2, a bifurcated yoke 5 is swingably supported on the left and right sides of the front portion of the vehicle body 1, and a steering wheel is mounted on a housing 7 of a receiving seat 6 swingably provided on the yoke 5. 2 is rotatably attached, and a suspension cylinder 8 is connected between the receiving seat 6 and the vehicle body 1. As shown in FIGS. 4 and 5, the receiving seat 6 is provided with a knuckle arm 9, a steering cylinder 10 is connected between the knuckle arm 9 and the vehicle body 1, and the left and right knuckle arms 9 and 9 are provided. Are connected by a link mechanism 11, and when the steering ring cylinder 10 is expanded and contracted, the receiving seat 6 swings via the knuckle arm 9 and the direction of the steered wheels 2 is changed.

As shown in FIG. 6, the housing 7 is a cylindrical body having an outer opening, and a wheel mounting plate 13 is rotatably supported on the outer peripheral surface of the housing 7 via a bearing 12. 14 is attached to the steering wheel 2. A hydraulic motor 15 is inserted and mounted in the housing 7, and one end of a drive shaft 17 is spline-fitted and coupled to an output shaft 16 of the hydraulic motor 15. The other end of the drive shaft 17 is connected to the wheel drive plate 13. A cover body 18 bolted to the tubular portion 13a is rotatably supported, and a drive shaft 17 and the tubular portion 13a are provided with first and second reduction mechanisms 19 and 20 axially spaced from each other. A clutch mechanism 21 is provided outside the second reduction mechanism 20. The first reduction mechanism 19 has a sun gear 22 rotatably supported by the drive shaft 17, a carrier 23 fixed to the housing 7 side, a planet gear 24 supported by the carrier 23, and the tubular portion 13a. Is provided with a ring gear 25 mounted by spline fitting on the inner peripheral surface thereof, and the second reduction mechanism 20 has a sun gear 26 rotatably supported by a drive shaft 17 and a carrier 27 engaged with the sun gear 26 and mounted. Further, a planetary gear 28 supported by the carrier 27 and a ring gear 29 spline-fitted on the inner peripheral surface of the cylindrical portion 13a are provided, and the ring gear 29 is integrated with the ring gear 25. The clutch mechanism 20 includes a driving body 30 fixed to the driving shaft 17, a driven body 31 meshed with the sun gear 26 of the second reduction mechanism 20, and a clutch in which the driven body 31 and the driving body 30 are alternately spline-fitted. It is composed of a plate 32 and a piston 33 provided on the driving body 30. When the pressure oil is supplied to the pressure receiving chamber 34 to extend the piston 33, the clutch plate 32 is crimped to connect the driving body 30 and the driven body 31. The pressure receiving chamber 34 communicates with the clutch inlet port 37 of the housing 7 through the oil hole 35 of the drive shaft 17 and the oil hole 36 of the output shaft 16. 38 is an inlet port for the hydraulic motor. The above power transmission system is schematically shown in FIG. A brake plate 38 is bolted to the wheel drive plate 13, and the housing 7 is provided with a pair of brake pads 39, 39 for holding the brake plate 38 and a brake cylinder 40 for pushing the brake pad 39. 41 are configured.

Next, the operation will be described. When pressure oil is supplied to the pressure receiving chamber 34 of the clutch mechanism 20 so that the clutch plate 32 is pressed and the clutch mechanism 20 is brought into contact with the clutch mechanism 20, the output shaft 16 of the hydraulic motor 15 rotates via the drive shaft 17 and the clutch mechanism 20. It is transmitted to the sun gear 26, the carrier 27 of the second speed reducer 20, the sun gear 22, the planetary gear 24, and the ring gear 25 of the first speed reduction mechanism 19, and rotationally drives the wheel rotating plate 13 together with the tire 14, and the driving torque thereof is that of the hydraulic motor 15. Remarkably larger than output torque. When the clutch mechanism 20 is disengaged, the rotation of the drive shaft 17 is not transmitted to the sun gear 26 and the steering wheel 2 is not driven even if the hydraulic motor 15 is driven, and the steering wheel 2 becomes free rotation with respect to the housing 7, The vehicle runs only by the rotation of the wheels. That is, the steering wheel 2 is driven by the hydraulic motor 15 when traveling at a low speed that requires high torque, and the steering wheel 2 is set to free rotation during high-speed traveling that does not require high torque.

[0010]

[Effect of the device]

 The knuckle arm 9 does not get in the way when the hydraulic motor 15 is attached to and removed from the housing 7 of the receiving seat 6, and the work is facilitated. The rotation of the output shaft 16 of the hydraulic motor 15 is decelerated by the first and second reduction mechanisms 19 and 20 and transmitted to the steered wheels 2. Therefore, the reduction ratio of the output shaft 16 is increased to make the steered wheels 2 larger. It can be driven by torque, and since the first and second reduction mechanisms 19 and 20 are provided at intervals in the axial direction, they do not become large, and the steering wheel 2 is made large by using a small hydraulic motor 15 with a small output torque. Not only can it be driven by torque, but also the first and second reduction gear mechanisms 19, 20 can be made compact, and the hydraulic motor 15 and the first and second reduction gear mechanisms 19, 20 can be installed compactly, and even for small diameter steering wheels 2. It can be used.

[Brief description of drawings]

FIG. 1 is a sectional view of a conventional example.

FIG. 2 is a front view of a dump truck.

FIG. 3 is a schematic perspective view of a steering wheel mounting portion of the dump truck.

FIG. 4 is a plan view of a steering wheel mounting portion.

FIG. 5 is a front view of a steering wheel mounting portion.

FIG. 6 is a cross-sectional view of a hydraulic motor mounting portion.

FIG. 7 is a schematic explanatory diagram of a power transmission system.

[Explanation of symbols]

1 ... vehicle body, 2 ... steering wheel, 5 ... yoke, 6 ... receiving seat, 7 ...
Housing, 8 ... Suspension cylinder, 9 ... Knuckle arm, 13 ... Wheel mounting plate, 13a ... Cylindrical part, 14 ...
Tires, 15 ... Hydraulic motor, 16 ... Output shaft, 17 ... Drive shaft, 19 ... First reduction mechanism, 20 ... Second reduction mechanism, 21 Clutch mechanism.

Claims (1)

[Scope of utility model registration request] 1. A yoke 5 is swingably supported on a vehicle body 1 in a substantially horizontal direction, a receiving seat 6 is swingably attached to the yoke 5, and a suspension cylinder 8 and a knuckle arm 9 are mounted on the receiving seat 6. And a cylindrical housing 7 is provided on the receiving seat 6 and opens outward on the side opposite to the knuckle arm 9. The wheel drive plate 1 is provided on the outer peripheral surface of the housing 7.
3 is rotatably supported, and the tire 1 is attached to the wheel mounting plate 13.
4 is attached to form a steering wheel 2, a hydraulic motor 15 is attached to the inside of the housing 7, and an output shaft 16 of the hydraulic motor 15 is attached.
The drive shaft 17 is connected to the drive shaft 17, and the first and second reduction gear mechanisms 1 extend between the drive shaft 17 and the tubular portion 13a of the wheel mounting plate 13.
A steering wheel drive device in which 9, 20 are provided at intervals in the axial direction.