JPS6313935Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention provides a front axle device for the front wheels of an agricultural machine such as a riding rice transplanter that is steered by and drives the front wheels. Specifically, the front wheels can be independently suspended without complicating the structure of the front axle device.

[Conventional technology and its problems]

Conventionally, this type of front axle device used in agricultural machinery has a kingpin case attached to the front axle on the underside of the vehicle body, and a front wheel attached to it, as described in, for example, Japanese Utility Model Application Publication No. 56-60603. and a gear case that is slidably and rotatably fitted, and a power transmission shaft from a wheel to a front wheel in the front axle is provided in both cases, and the power transmission shaft is configured to be telescopic. ,
A hydraulic cylinder is formed in the fitting portion of both cases, and the hydraulic pressure in the hydraulic cylinder causes
It was constructed so that the front wheels were supported by a special suspension.

However, since this conventional device has a hydraulic cylinder that supports the independent suspension of the front wheels formed in the fitting part of both cases, the structure is extremely complicated, large, and extremely expensive. Moreover, when the front wheels move up and down, hydraulic pressure is likely to leak, and the sliding parts are subject to severe wear and rust, which reduces the function of the independent suspension, resulting in problems such as low durability. It was hot.

The present invention aims to solve this problem.

[Means to solve the problem]

Therefore, in the present invention, a hollow king pin case is attached to both outer ends of a hollow front axle disposed on the lower front surface of the vehicle body in a direction substantially perpendicular to the direction of movement of the front axle, and a cylinder is attached to the lower surface of the king pin case. A gear case that pivotally supports a front wheel shaft to which a front wheel is attached is fitted into the cylindrical king pin so that it can rotate and slide freely. A telescopically connected power transmission shaft is inserted with the upper shaft supported by the king pin case and the lower shaft supported by the gear case, and the upper shaft is inserted into the king pin case and the lower shaft is connected to the axle within the front axle. are interlocked with the front wheel axles within the gear case, and a buffer spring is provided between the upper and lower shafts of the power transmission shaft to counteract contraction.

〔Example〕

The following describes the drawings in which the embodiment of the present invention is applied to a riding rice transplanter. In the drawings, reference numeral 1 indicates a pair of left and right front wheels 3, 3 on the front lower surface of the body frame 2, and left and right front wheels 3 on the rear lower surface. A pair of rear wheels 4,4
A traveling vehicle body is shown, which is provided with an engine 5, a steering gear box 7 with a handle 6, and a seat 8 from the front on the upper surface of the vehicle body frame 2, and a middle lower surface of the vehicle body frame 2. , a transmission case 9 is provided which transmits the power from the engine 5 to the front wheels 3 and the rear wheels 4 by changing the speed appropriately, and a seedling planting device 10 is installed at the rear of the traveling vehicle body 1 using a parallel link mechanism. 11 so that it can be raised and lowered freely.

Reference numeral 12 designates a hollow front axle disposed on the lower front surface of the vehicle body frame 2 substantially perpendicular to the direction of movement thereof, and the front axle 12 includes:
The central part thereof is attached to the front surface of the transmission case 9, and inside the hollow front axle 12 is an axle 1 to which power is transmitted via a differential gear mechanism 14 by a shaft 13 from the transmission case 9.
5 and 15 are provided, and the axle 15 is supported by a ball bearing 16 at the outer end of the front axle 12.

Reference numeral 17 indicates a king pin case attached to the outer end of the front axle 12 with bolts or the like, and a cylindrical king pin 18 is integrally formed downward on the lower surface of the king pin case 17. The power transmission shaft 19 is inserted on the same axis as the king pin 18, and the upper end of the power transmission shaft 19 is supported in the king pin case 17 by a ball bearing 20. Power is transmitted through meshing bevel gears 21 and 22.

Reference numeral 23 designates a gear case that pivotally supports a shaft 24 to which the front wheel 3 is attached. A hollow boss 25 is integrally provided upward on the upper surface of the gear case 23, and this boss 25 is connected to the king pin 18. The lower end of the power transmission shaft 19 is fitted into the gear case 2 through the bearing metal 26 so as to be rotatable and slidable.
The power transmission shaft 19 is supported by a ball bearing 27 inserted into the front wheel 3, and power is transmitted from the power transmission shaft 19 to the shaft 24 of the front wheel 3 via bevel gears 28 and 29 that mesh with each other.

Then, the power transmission shaft 19 is connected to the kingpin 1
8, the hollow part 3 is divided into an upper shaft 30 in the kingpin case 17 and a lower shaft 31 in the kingpin 23, and is formed at the lower end of the upper shaft 30.
2, a joint shaft 33 formed at the upper end of the lower shaft 31
The inner surface of the hollow portion 32 and the outer surface of the joint shaft 33 are provided with vertical grooves 34, 3 extending in the axial direction.
5 is carved, a plurality of steel balls 36 are inserted into the vertical grooves 34 and 35, and the upper shaft 30 and the lower shaft 31 are telescopically connected in a state where power can be transmitted, and A compression type buffer spring 37 is provided between the upper shaft 30 and the lower shaft 31 to counteract the contraction of both shafts.

Note that reference numeral 38 in the figure indicates a bracket that is attached to a flange portion 39 integrally formed on the boss 25 of the gear case 23 with bolts 40, and the upper end of the bracket 38 is bent toward the upper surface of the king pin case 17. A bolt 41 is screwed onto the tip of the king pin 18 in the axial direction, and the head 40' of the bolt 40 is opposed to the upper surface of the king pin case 17 with a gap of an appropriate size. The bracket 38 is configured to prevent the bracket from coming off from the kingpin 18, and
A knuckle arm 43 is connected to a pitman arm (not shown) in the steering gear box 7 via a front drag link 42, and connects both front wheels 3, 3 so that both front wheels 3, 3 move in the same direction during steering operation. tie rod 4
Arms 45 connected to 4 are each integrally provided.

In this configuration, power from an axle 15 in the front axle 12 is transmitted to both front wheels 3, 3 via a power transmission shaft 19 consisting of an upper shaft 30 and a lower shaft 31; The wheel load is transmitted to and supported by the front axle 12 via the buffer spring 37 provided between the lower shaft 31 and the upper shaft 30, so both front wheels 3, 3 move up and down independently. Therefore, it is supported by what is called an independent suspension.

In this case, the downward kingpin 18 in the kingpin case 17 is formed into a hollow shape, and the power transmission shaft 19 in which the upper shaft 30 and the lower shaft 31 are telescopically connected is inserted into the hollow shape, and the power transmission shaft 19 in which the upper shaft 30 and lower shaft 31 are telescopically connected is inserted. The axle 15 and the upper shaft 30 of the power transmission shaft 19 transmit power within the king pin case 17, while the lower shaft 31 of the power transmission shaft 19 and the shaft 24 of the front wheel 3 transmit power within the gear case 23. Furthermore, by providing a buffer spring 37 between the upper shaft 30 and the lower shaft 31 of the power transmission shaft 19 to counteract the contraction therebetween,
All power transmission mechanisms from the axle 15 in the front axle 12 to the shaft 24 of the front wheel 3, and the front wheel 3
The buffer spring 37 for independently supporting the can be housed in the sealed case.

[Functions and effects of the idea]

As described above, the present invention has the configuration described in the claims for utility model registration, so that all the power transmission mechanisms to the front wheels and the buffer springs for independent suspension of the front wheels are housed in a sealed case. Since both front wheels can be configured with independent suspension, the structure is much simpler than when the front wheels are independently suspended using hydraulic cylinders as in the prior art, and is compact and compact. It is lightweight and can be provided at low cost, and unlike the prior art, there is less risk that the independent suspension function will deteriorate due to hydraulic leakage, wear and rust in the hydraulic cylinder, and it is durable. Highly effective.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a side view of a riding rice transplanter, Fig. 2 is a plan view of Fig. 1, and Fig. 3 is a side view of a riding rice transplanter.
The figure is an enlarged cross-sectional view of Fig. 1, and Fig. 4 is a cross-sectional view of Fig. 3.
FIG. 5 is an enlarged cross-sectional view of FIG. 3 as viewed from above. 1... Running vehicle body, 2... Vehicle body frame, 3...
Front wheel, 12...Front axle, 17...King pin case, 18...King pin, 23...Gear case, 24...Front wheel axle, 17...Power transmission shaft, 30...Upper shaft, 31...Lower shaft, 37 ……
Buffer spring, 21, 22...Bevel gear, 28, 29...
...Bevel gear.

Claims (1)

[Scope of utility model registration request] A hollow king pin case is attached to both outer ends of a hollow front axle arranged on the lower front surface of the vehicle body in a direction substantially perpendicular to the direction of travel of the vehicle, and a cylindrical king pin is protruded from the lower surface of the king pin case. A gear case that pivotally supports a front wheel axle to which a front wheel is attached is rotatably and slidably fitted into the cylindrical king pin, and within the king pin case is a power source that telescopically connects an upper shaft and a lower shaft. A transmission shaft is inserted through the transmission shaft with its upper shaft supported in the king pin case and its lower shaft supported in the gear case. 1. A front axle device for an agricultural working machine, characterized in that a buffer spring is provided between an upper shaft and a lower shaft of the power transmission shaft to counter contraction, while interlocking with each other.