JPH0228083Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to a rear wheel suspension system for a speed sprayer that has a front wheel, a front rear wheel, and a rear rear wheel on each side. The present invention also relates to a rear wheel suspension system for a speed sprayer in which the axles of rear rear wheels are integrally swingable around a common axis.

[Conventional technology]

A conventional general speed sprayer has a front wheel, a front rear wheel, and a rear rear wheel on each side.
The axle to which the front rear wheel and rear rear wheel can be attached is
The relative position with respect to the frame in the height direction is fixed. Therefore, when the speed sprayer travels on a road surface with large steps or a road surface with a sudden change in slope angle,
Some wheels of the speed sprayer are lifted off the road surface, resulting in a reduction in driving force, inability to drive, concentration of load on some axles, and a large impact due to bouncing when returning to normal position. This is causing problems such as occurrences.

Therefore, Utility Model Application No. 55-134329 and Utility Model Application No. 55
- In the speed sprayer of Publication No. 142312, the axles of the front rear wheels and the rear rear wheels are made to swing integrally around the axis of a common swing shaft, so that the front wheels and the front The rear wheels and all of the rear wheels are kept in contact with the ground without lifting up.

[The problem that the idea attempts to solve]

The problems of the conventional speed sprayer in which the axles of the front rear wheels and the rear rear wheels swing integrally in accordance with the road surface on which the speed sprayer travels are enumerated as follows.

(a) The swing shaft (usually the rear wheel drive shaft) is rotatably supported on the frame only at one end of the swing shaft, and the swing shaft is Since the rotational power from the engine is received at the end and sent from the outer end to the front rear wheels and rear rear wheels, the deflection of the swing shaft increases and the durability of the swing shaft decreases. There is.

(b) As the deflection of the rocking shaft increases or decreases, the distance between the rocking shaft and the axles of the front rear wheels and rear rear wheels increases or decreases significantly, which impedes the transmission of rotational power from the rocking shaft to each axle. occurs.

(c) The deflection of the swing shaft causes the rear wheels to swing around the longitudinal axis of the speed sprayer, leading to uneven wear of the rear wheels and deterioration of the speed sprayer's posture.

The purpose of this invention is to provide a rear wheel suspension system that overcomes the above-mentioned problems in a speed sprayer in which the axles of the front rear wheels and rear rear wheels swing integrally in accordance with the road surface on which the speed sprayer travels. The goal is to provide the following.

[Means to solve the problem]

This invention will be explained using reference numerals in the drawings that correspond to the embodiments.

The speed sprayer that is the premise of this invention is
A front wheel 16, a front rear wheel 25, and a rear rear wheel 26 are provided on each of the left and right sides. The rear wheel suspension system of this invention has the following components (a) to (d).

(a) A rear wheel drive shaft 20 that extends laterally from the rear differential gear 28, passes through the case body 23, and is rotatably supported by the frame 11 via a bearing 22 at its tip. (b) The case body 23 and It is fitted onto the rear wheel drive shaft 20 between the rear differential gear 28, is rotatably supported by the frame 11 at one end of the outer periphery, and rotatably supports the case body 23 at the other end of the outer periphery. Bearing rod 21 (c) The bearing rod 21 (c) is rotatably supported by the case body 23 parallel to the rear wheel drive shaft 20 on the front and rear sides of the rear wheel drive shaft 20, respectively, and is rotatably supported on the front rear wheel 25 and the rear wheel drive shaft 25 on the outside of the case body 23. Rear rear wheel 26
a front rear axle 32 and a rear rear axle 33 to which are respectively attached (d) a rear wheel drive shaft 20 disposed within the case body 23;
The transmission member 27 transmits rotational power from the front rear axle 32 to the rear rear axle 33. [Function] The case body 23 is rotatably supported on the other end of the outer circumference of the bearing rod 21, and thereby the rear wheel drive Axis 2
It is designed to be able to swing freely about the zero axis. Front wheel 1
6 shares the weight of the speed sprayer and keeps it in contact with the ground, regardless of changes in the road surface on which the speed sprayer runs, whereas the front rear wheels 25 and the rear rear wheels 26 share the weight of the speed sprayer and keep it in contact with the ground, regardless of changes in the road surface on which the speed sprayer runs. Due to this change, the weight of the speed sprayer tends to be concentrated on one of the front rear wheels 25 and the rear rear wheels 26. If there is a difference in drag from the road surface to the front rear wheels 25 and the rear rear wheels 26, the front rear wheels 25
The case body 23 swings around the axis of the rear wheel drive shaft 20 so that the one receiving the greater resistance among the front rear wheels 25 and the rear rear wheels 26 rises. The side rear wheels 26 remain in contact with the ground.

〔Example〕

This invention will be described below with reference to embodiments shown in the drawings.

FIG. 2 is a schematic side view of the speed sprayer. On the frame 11, in order from the front side, there are a driver's seat 12 where the driver gets in and operates the speed sprayer, a chemical tank 13 that stores chemicals, and a chemical tank that is fed under pressure from a pump (not shown). A spraying section 14 is provided that sprays the medicine in 13 to the surroundings. The front wheel 16, the front rear wheel 25, and the rear rear wheel 26 as rear wheels are respectively attached to the front axle 15, the front rear axle 32, and the rear rear axle 33. and the front wheel 1 via the rear rear axle 33
6. It is supported by the front rear wheel 25 and the rear rear wheel 26. The inverted V-shaped chain case 23 rotatably supports a front rear axle 32 and a rear rear axle 33.

FIG. 1 is a configuration diagram of a power transmission system of a speed sprayer. The rotational power from the engine (not shown) is distributed from the transmission 18 to the front and rear, and the rotational power distributed forward is transmitted to the left and right front wheels 16 via the drive shaft 19 and the front axle 15. The rotational power distributed to the rear is transmitted to the rear differential gear 28 via the drive shaft 29, and further distributed from the rear differential gear 28 to the left and right rear wheel drive shafts 20, and then connected to the chain sprocket mechanism. 27 to the front rear wheel 25 and the rear rear wheel 26 via the front rear axle 32 and the rear rear axle 33, respectively.

FIG. 3 is a vertical sectional view showing the configuration of the rear wheel suspension system. The rear wheel drive shaft 20 extends horizontally from the rear differential gear 28 to the side, passes through the upper end of the chase case 23 so as to be able to rotate relative to it, and has a ball bearing 22 at the tip. is mounted and rotatably supported by the frame 11 via a ball bearing 22. Bearing rod 21
is fitted to the rear wheel drive shaft 20 between the chain case 23 and the rear differential gear 28, and is positioned relative to the chain case 23 and the frame 11 side member that are adjacent to each other in the axial direction on both axial end surfaces. It can be rotated freely. Ball bearing 24
is attached to the outer end of the outer periphery of the bearing rod 21,
A chain case 23 is rotatably supported on a bearing rod 21. The ball bearing 31 is attached to the inner end of the outer periphery of the bearing rod 21, and rotatably supports the bearing rod 21 on the frame 11. The two chain sprocket mechanisms 27 are connected to the chain case 23.
The rotational power is transmitted from the rear wheel drive shaft 20 to the front rear axle 32 and the rear rear axle 33, respectively. Front rear axle 32 and rear rear axle 33
is rotatably supported by the lower end of the chain case 23, protrudes to the outside of the chain case 23, and connects the front rear wheel 25 and the rear rear wheel 26 at the protruding end.
can be mounted in a rotational manner.

The operation of the embodiment will be explained.

The chain case 23 is rotatably supported on the other end of the outer periphery of the bearing rod 21 via a ball bearing 24, so that it can swing freely about the axis of the rear wheel drive shaft 20. The front wheels 16 share the weight of the speed sprayer and are kept in contact with the ground regardless of changes in the road surface on which the speed sprayer is running, whereas the front rear wheels 25 and the rear rear wheels 26 share the weight of the speed sprayer regardless of changes in the road surface on which the speed sprayer is running. Due to this change, the weight of the speed sprayer tends to concentrate on one of the front rear wheels 25 and the rear rear wheels 26. If there is a difference in drag from the road surface to the front rear wheels 25 and the rear rear wheels 26, the chain case 23 is configured such that the one receiving the larger drag among the front rear wheels 25 and the rear rear wheels 26 rises. is the rear wheel drive shaft 20
The front rear wheel 25 and the rear rear wheel 26 are both kept on the ground.

FIGS. 4 and 5 are state diagrams when the speed sprayer is running on a road surface with steps and a road surface transitioning from an ascending slope to a horizontal surface, respectively. By swinging the chain case 23,
The speed sprayer runs while keeping all of the front wheels 16, front rear wheels 25, and rear rear wheels 26 in contact with the ground, regardless of the road surface condition.

[Effect of idea]

In this invention, the rear wheel drive shaft is fitted with a bearing rod at its intermediate portion and is supported by the frame via the bearing rod, resulting in the following effects.

(a) Since the rear wheel drive shaft is supported by the frame via a bearing and a bearing rod at the tip and middle portions, respectively, the deflection of the rear wheel drive shaft is reduced and the durability of the rear wheel drive shaft is improved. Furthermore, as a result of improving the durability of the rear wheel drive shaft, it is possible to reduce the strength of the rear wheel drive shaft to ensure a predetermined durability, and it is possible to reduce costs.

(b) By reducing the deflection of the rear wheel drive shaft as the swing axis of the front rear axle and the rear rear axle,
The distance between the rear wheel drive shaft and the front rear axle and the rear rear axle is maintained appropriately, and rotational power is transmitted by the transmission member from the rear wheel drive shaft to the front rear axle and the rear rear axle without any problem.

(c) Furthermore, by reducing the deflection of the rear wheel drive shaft, the swinging surface of the case body, which is rotatably supported by the bearing rod, is also properly held, suppressing uneven wear on the rear wheels. , the posture of the speed sprayer is optimized.

[Brief explanation of drawings]

The drawings relate to an embodiment of this invention, and FIG. 1 is a configuration diagram of the power transmission system of the speed sprayer, FIG. 2 is a schematic side view of the speed sprayer, and FIG. 3 is a vertical sectional view showing the configuration of the rear wheel suspension system. , 4 and 5 are state diagrams when the speed sprayer is running on a road surface with steps and a road surface transitioning from an upward slope to a horizontal surface, respectively. 11... Frame, 16... Front wheel, 20... Rear wheel drive shaft, 21... Bearing rod, 22... Ball bearing, 23... Chain case (case body), 25
... Front rear wheel, 26 ... Rear rear wheel, 27 ... Chain sprocket mechanism (transmission member), 28 ...
Rear differential gear, 32...front rear axle, 33...rear rear axle.

Claims (1)

[Scope of utility model registration request] In a speed sprayer equipped with a front wheel 16, a front rear wheel 25, and a rear rear wheel 26 on each side, it extends laterally from the rear differential gear 28, penetrates the case body 23, and passes through the bearing 22 at the tip. A rear wheel drive shaft 20 is rotatably supported by the frame 11, and a rear wheel drive shaft 20 is fitted to the rear wheel drive shaft 20 between the case body 23 and the rear differential gear 28, and the frame is fitted on one end of the outer periphery. 11 and rotatably supports the case body 23 on the other end side of the outer periphery, and a bearing rod 21 that rotatably supports the case body 23 on the other end side of the outer periphery; The front rear wheel 25 and the rear rear wheel 2 are rotatably supported by the case body 23 in parallel with the
6 are respectively attached to the front rear wheel 32 and the rear rear axle 33, and the rear wheel drive shaft 20 is disposed inside the case body 23 and transmits rotational power from the front rear axle 32 and the rear rear axle 33. A rear wheel suspension system for a speed sprayer, comprising a transmission member 27.