JPH0228082A - Horseback riding type vehicle - Google Patents

Abstract

PURPOSE:To eliminate the necessity for providing a hitch mounting bracket by connecting an axle pipe to both sides of a drive part housing of a swivelable rear arm in a horseback riding type four-wheel vehicle, equipped with a wide spread tire, and connecting both the axle pipes to mount a tractive hitch. CONSTITUTION:A rear arm 14 is swivelably provided about a shaft 17 to the rear from a body of horseback riding type four-wheel vehicle equipped with a wide spread tire of balloon tire or the like, and rear axles 25a, 25b, driving rear wheels 27, are provided in a rear end part of the arm. Power is transmitted to the rear axles 25a, 25b from an engine through a drive shaft 19 and a final reduction mechanism 30. The drive shaft 19 and the final reduction mechanism 30 are coated with a protective pipe 18 and a housing 31, and axle pipes 20a, 20b, coating the rear axles 25a, 25b, are connected to both sides of the housing 31, while a tractive hitch 50 is mounted in a manner wherein both the axle pipes 20a, 20b are connected. The necessity for providing a bracket for mounting the hitch is eliminated, and the total unit constitution is simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a riding type vehicle such as a four-wheeled motor vehicle equipped with balloon tires.

[Conventional technology]

A four-wheeled motor vehicle equipped with low-pressure wide balloon tires is equipped with a rear arm that can swing vertically at the rear of the vehicle body where the engine is mounted, just like a two-wheeled motor vehicle. Left and right rear wheels are supported at the rear end of this rear arm via a rear axle, and this rear axle and a drive shaft that transmits engine power are interlocked via a final reduction gear. This final reduction gear is covered by a housing, and axle tubes that support the rear axle are connected to both left and right sides of this housing.

By the way, this type of four-wheeled motor vehicle can easily travel on uneven terrain such as sandy areas and wetlands, so it has recently been used not only for motor sports and leisure purposes, but also for motor sports and leisure purposes.
For example, they are used for practical purposes such as towing agricultural machinery and transporting cargo. This practical four-wheeled motor vehicle is equipped with a hitch for towing agricultural machinery and trailers. As shown in the example, the housing was installed using the rear surface of the housing exposed at the rear of the vehicle body.

[Problem to be solved by the invention]

However, with this conventional configuration, a special bracket must be provided on the rear surface of the housing for attaching the hitch, which increases the number of parts and increases costs.

Moreover, since a large load is applied to the hitch attachment part during towing, the bracket needs to have great rigidity to withstand this load, which results in an increase in the size and weight of the bracket. There are also problems.

Therefore, the present invention eliminates the need for special brackets for mounting the hitch, and also ensures sufficient strength when mounting the hitch.Moreover, the hitch can be used as a strength member of the left and right axle tubes. The purpose of the mounting of the axle tube to the housing is to provide a riding type vehicle that can increase the strength.

[Means for Solving the Problem] Therefore, in the present invention, a rear axle for driving the left and right rear wheels is provided at the rear end of the rear arm extending rearward from the vehicle body on which the engine is mounted, and the rear axle and the engine power are connected to each other. The interlocking part with the drive shaft that transmits the information is covered by a housing, and left and right axle tubes through which the rear axle is inserted are arranged on both the left and right sides of this housing, and connecting members welded to the ends of these axle tubes are connected to the housing. The present invention is based on a rider-type vehicle with bolts fastened to both the left and right sides, and is characterized by the provision of a hitch for towing, spanning between the connecting members of the left and right axle tubes.

[Effect]

According to this configuration, the hitch can be attached using the connecting member that connects the axle tube to the housing, and special brackets as in the prior art are not required. Moreover, since this connecting member is inherently high in strength, sufficient strength can be ensured when attaching the hitch.

In addition, when loading heavy loads on the vehicle body or while driving,
When a large impact is applied to the axle tube, such as when the rear wheel rides over an uneven surface, a large vertical bending load is applied to the connecting portion between the axle tube and the housing.

However, in the above configuration, since the connecting members integral with the left and right axle tubes are connected to each other via the pitch,
This hitch resists the above bending load by 1. It functions as a strength member that prevents the connecting portion of the axle tube from bending or twisting, and the strength of the attachment of the axle tube to the housing is improved accordingly.

〔Example〕

An embodiment of the present invention will be described below based on drawings in which the present invention is applied to a four-wheeled motor vehicle.

Reference number 1 in FIG. 3 is a pipe frame that constitutes the vehicle body, and this vibe frame 1 is provided with left and right upper rails 3 that support a fuel tank 2. The upper rails 3 are parallel to each other and extend in the front-rear direction, and both front and rear ends thereof are bent downward and connected to left and right lower rails 4 that extend in the front-rear direction. Left and right front wheels 5 are arranged on both sides of the front end of the pipe frame 1, and these front wheels 5 are operated by a bar handle 6.

An engine 7 is mounted between the upper rail 3 and the lower rail 4. The engine 7 is located near the center of the pipe frame 1, and a gear transmission (not shown) is built into the crankcase 8.

Note that a seat 10 and a carrier 11 are installed on the left and right seat rails 9 that extend rearward from the rear of the upper rail 3, and a seat 10 and a carrier 11 are installed for the driver to sit in a straddling position. Left and right footrests 12 are attached.

In addition, a rear arm assembly 1 is attached to the left and right brackets 13 that connect the rear ends of the upper rail 3 and the lower rail 4.
The front end of 4 is pivotably supported.

As shown in FIG. 1, the rear arm assembly 14 includes left and right arm members L5a and 15b extending rearward, and these arm members 15a and 15b are expanded in a direction that separates them from each other as they move rearward.

The front ends of the arm members 15a and 15b are connected by a pivot vibe 16 extending in the left-right direction, and both ends of the pivot vibe 16 are pivotally supported by the bracket 13 via left and right pivot shafts 17. Furthermore, a protective vibrator 18 that is parallel to the center line X1-X along the longitudinal direction of the vehicle body is welded to the left arm member 15a. The protective vibe 18 includes left and right arm members 15a,
15b, and a drive shaft 19 interlocked with the output end of the gear transmission is inserted into this protective vibe 18.

Left and right cylindrical axle tubes 20a, 20b are attached to the rear ends of the arm members 15a, 15b.

These axle tubes 20a and 20b are pivot vibe IB
The right axle tube 20b is installed by welding the plate 21 to the outer circumferential surface of the axle tube 20b by overlapping the plate 21 on the bracket 22 at the rear end of the arm member 15b and tightening it with bolts 23 and nuts 24. The arm member 15
It is removably attached to b. On the other hand, the left axle tube 20a is integrally welded to the rear end of the arm member 15a, and inside both of these axle tubes 20a, 2Ob, left and right rear axles 25a, 25b are connected via bearings 2B. It is rotatably inserted and supported. Respective rear axle 25
The outer ends of a and 25b are the axle tube 20a.

The hub 28 of the left and right rear wheels 27 is spline-coupled to this leading end.

The rear axles 25a and 25b and the drive shaft 19 that transmits the engine power are interlocked via a final reduction gear 30. The final reduction gear device 30 has a reduction gear device 32 and a differential gear device 33 integrated into a housing 31 made of aluminum alloy.
9 and the inner ends of the rear axles 25a, 25b, respectively. The reduction gear device 32 is connected to the drive shaft 19
A reduction gear 34 provided at the rear end and this reduction gear 3
4 and a large reduction gear 35 that meshes with the gear. The reduction gear 35 is bolted to the differential gear case 36,
The differential gear case 36 is pivotally supported inside the housing 31 via a bearing 37.

Further, the differential gear device 33 is configured by arranging a pair of small differential gears 38 and a large differential gear 39 at right angles inside a differential gear case 36 . Both gears 38 and 39 mesh with each other, and the differential pinion 38 is pivotally supported by the differential gear case 36 via a differential pinion shaft 40.
The large differential gear 39 is connected to the rear axle 25a.

It is splined to the inner end of 25b.

Therefore, when the left and right rear wheels 27 are rotating at a constant speed, the differential small gear 38 rotates together with the differential gear case 313, and the differential large gear 39 interlocked with the rear axles 25a and 25b is rotated at a constant speed. However, when a difference in rotation occurs between the left and right rear wheels 27, the differential pinion 38 rotates while revolving, and applies differential motion to the left and right rear axles 25a and 25b.

Note that the rear wheels 27 and the front wheels 5 are equipped with low-pressure wide balloon tires.

By the way, the housing 31 of the final reduction gear 30 is located between the left and right axle tubes 20a and 20b,
Both left and right side surfaces of the housing 31 form flat surfaces extending in the front-rear direction. A fitting hole 45 is opened on both left and right side surfaces of the housing 31, and the axle tube 2 is inserted into the fitting hole 45.
The open ends of 0a and 20b are fitted from the side,
It is a so-called in-rotation joint. And the axle pipe 20
A support plate 4B made of a steel plate is welded as a connecting member to the outer peripheral surface of the housing 31 side of a and 20b, and by superimposing this support plate 46 on both sides of the housing 31 and tightening with bolts 47, the axle can be fixed. tube 2
0a, 20b and the housing 31 are connected.

Note that the axle pipes 20a and 20b and the seat rail 9
A hydraulic shock absorber 48 is installed between the rear end and the rear end.

Further, the support plate 46 welded to each axle tube 20a, 20b is provided with extending pieces 49 extending rearward at two places, upper and lower at its rear end. Hituchi 50 for towing machinery and trailers
is installed. As shown in FIGS. 2 and 4, the hitch 50 is constructed by welding an upper plate 51 and an under plate 52 made of steel plates to each other.
7, the rear axle 25a.

It protrudes more rearward than 25b. Flange portions 51a bent upward are formed on both left and right sides of the upper plate 51, and flange portions 52a bent downward are formed on both left and right sides of the under plate 52. The tips of these flange portions 51a and 52a are superimposed on the inner surface of the extension piece 49, and are tightened and fixed via bolts 53 and nuts 54. Therefore, the hitch 50 is mounted using the support plates 46 for connecting the axle tubes 20a, 20b to the housing 31, and these support plates 46 are connected to each other.

Note that the lower surface of the housing 31 is covered with a protector 55, and this protector 55 is bolted using the support plate 46.

According to such a configuration, the left and right axle tubes 20a.

Since the towing hitch 50 was attached using the support plate 46 for connecting the 20b to the housing 31,
A special bracket for conventional hitch mounting is not required, and the number of parts can be reduced accordingly.

Moreover, the support plate 4B is connected to the axle tubes 20a and 20b.
Since it is used to connect the hitch 50 to the housing 31, the hitch 50 is inherently strong (and the hitch 50 can be mounted with sufficient strength without special reinforcement.

By the way, if a heavy load is loaded on the carrier 11 located on the rear wheel 27, or if a large impact is applied to the rear axle 25 due to the rear wheel 27 riding over an uneven surface while driving, the rear axle 25a, Axle tube 2 supporting 25b
A large bending load in the vertical direction is applied to the connecting portions between 0a and 20b and the housing 31.

However, in the above configuration, the axle tube 20a.

Since the support plates 46 connecting the support plates 20b to the housing 31 are connected to each other by a hitch 50, the hitch 50 presses down the support plate 46 against the bending load applied to the connection portion between the support plate 46 and the housing 31. It turns out.

Therefore, the hitch 50 can be used as a strength member for reinforcing the joint between the axle tubes 20a, 20b and the housing 31, and the strength of the attachment of the axle tubes 20a, 20b to the housing 31 is improved accordingly.

In the above embodiment, the hitch is bolted to the support plate at a location different from the housing, but the hitch may be superimposed on the outer surface of the support plate, and the hitch and the support plate may be collinear with the housing.

In addition, in the above embodiment, the drive shaft that transmits the engine power is inserted into a protective tube separate from the arm member, but in some cases, the housing may be integrally connected to the rear end of the protective vibrator to provide this protection. The left arm member may be omitted by allowing the vibrator to also function as an arm member.

Further, in the above embodiment, the rear axle is divided into left and right parts, and a differential gear device is interposed between the rear axle and the drive shaft, but the present invention is not limited to this. As a single unit, the rear axle and the drive shaft may be directly interlocked via a reduction gear device.

〔Effect of the invention〕

According to the present invention described in detail above, there is no need for special brackets for mounting the hitch, so the number of parts can be reduced accordingly, and the structure can be provided with a simple structure and low cost. Moreover, since the connecting member to which the hitch is attached is inherently strong, the hitch can be attached with sufficient strength without special reinforcement.

At the same time, the hitch can be used as a strength member for reinforcing the joint between the axle tube and the housing, and the strength of the attachment of the axle tube to the housing can be increased accordingly.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a plan view of the rear arm assembly with the interlocking part between the rear axle and the drive shaft cut away, Fig. 2 is a rear view of the four-wheeled motor vehicle, and Fig. 3 is the rear arm assembly of the four-wheeled motor vehicle. A side view of the four-wheeled vehicle, FIGS. 4 and 5 are side views of the parts in which the hitch is installed, respectively. 7... Engine, 14... Rear arm (rear arm assembly), 19... Drive shaft, 20a, 20
b...Axle pipe, 25a, 25b...Rear axle, 2
7... Rear wheel, 31... Housing, 46... Connection member (support plate), 50... Hitoshi. Applicant's agent Patent attorney Takehiko Suzue

Claims (1)

[Claims] A rear axle that drives the left and right rear wheels is provided at the rear end of the rear arm that extends rearward from the vehicle body on which the engine is mounted. In a riding type vehicle, left and right axle tubes through which the rear axle is inserted are arranged on both left and right sides of the housing, and connecting members welded to the ends of these axle tubes are bolted to both left and right sides of the housing. A riding-type vehicle characterized by having a hitch for towing that spans between the connecting members of the pipe.