JP3421685B2 - Rear wheel tread change device for small vehicles - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear wheel tread changing device for a small vehicle, and can be used for an electric tricycle or the like. 2. Description of the Related Art A small vehicle that runs by driving an electric motor is used not only for running on public roads and hills, but also for running on city walkways and indoors. Sometimes. Depending on where you travel,
The width of the vehicle body is made as small as possible and the tread of the rear wheel is changed so that the tread can be widened to stabilize running, or narrowed so as not to interfere with others or structures. It travels according to the place. The present invention provides an electric motor.
The rear wheels 2 and 2 are mounted on the left and right ends of the axle 1 driven by M so as to be movable left and right, and the vehicle is moved forward and backward.
The grounding wheel 3 that can be grounded is driven to the ground.
Thus, the rear wheel tread changing device of the small vehicle is configured to be interlocked so that the tread can be changed via the tread interlocking mechanism 4. The small vehicle can be driven by the rotation of the rear wheel 2 by driving the axle 1 by the power of the electric motor. When the tread is widened in order to stabilize the running as in the case of running on a hill, the grounding wheel 3 is driven by grounding the grounding wheel 3 while traveling forward, and the axle is driven via the tort interlocking mechanism 4. The left and right rear wheels 2 on 1 are moved outward, and the distance between the left and right rear wheels 2, 2 is increased.
When the grounding wheel 3 is separated from the grounding surface, the distance between the rear wheels 2 and 2 is fixed at that position. When the tread is narrowed, such as when traveling on a sidewalk, when the vehicle body is moved backward with the grounding wheel 3 grounded, the grounding wheel 3 is grounded in the opposite direction to that when the tread is widened. When driven, the distance between the left and right rear wheels 2 and 2 is narrowed by the tread interlocking mechanism 4. When the grounding wheel 3 is raised and separated from the grounding surface, the distance between the rear wheels 2 and 2 is fixed at that position. As described above, the tread change adjustment can be performed by moving the left and right rear wheels 2 and 2 in the direction of the axle 1 through the tread interlocking mechanism 4 while performing the grounding operation of the grounding wheel 3 by forward and backward movement of the vehicle body. The configuration is simple and the rear wheels 2 and 2 are moved while moving forward and backward in the vehicle body, so that smooth adjustment is performed. The figure shows an electric tricycle wheelchair.
A front wheel 7 that can be steered by a steering handle 6 is arranged at the front,
A pair of left and right rear wheels 2 are arranged below the rear driver's seat 8,
The front wheel fender 9, the rear wheel fender 10, the step floor 1 are covered on the cover covering the front wheel 7 and the rear wheel 2.
1 and a rear cover 12 and the like, a driver's seat 8 is mounted on the rear cover 12, and the handle shaft 13 has a handle 6 at the upper end through the front wheel fender 9, and a front wheel 7 at the lower end. And is inclined at an appropriate angle downward and forward. Reference numeral 14 denotes a lamp. Drive rear wheel 2 and front wheel 7
Drive while steering. The rear wheel 2 is driven by the electric motor M, and is rotated and transmitted through the transmission mechanism in the transmission case 15 and the axle 1 in the left and right axle housing 16. The power is transmitted from the motor shaft 18 of the electric motor M to the axle 1 from the left and right differential shafts 21 through the clutch gear 19 and the differential gear 20. Reference numeral 22 denotes a clutch lever, which is configured to be manually pressed by cutting off transmission of the clutch gear. The axle 1 is rotatably mounted in the axle housing 16 by a linear roller bearing 23 and is movable in the axial direction. The differential shaft 21
On the other hand, it is configured to be movable in the axial direction by fitting with the spline 32 and to rotate integrally from the differential shaft 21 to the axle 1 at all times. An arm groove 24 is formed in the axle 1, and an arm 26 that moves to the left and right by a spiral shaft 25 is engaged with the arm groove 24, and the arm 26 is moved to the left and right by driving the ground shaft 3 to ground. The rear wheel 2 can be moved by moving. The spirals at both ends of the spiral shaft 25 are formed symmetrically. If the arm 26 is moved to the left and right when the rear wheel 2 is rotated forward by the rotation of the motor M, the reverse transmission of the rear wheel 2 is achieved. Time is set to move from outside to inside. The central portion of the spiral shaft 25 is supported by the transmission case 15, and both left and right end portions are supported by a bracket 27 integrated with the vehicle body 5 side. The forward / reverse switching of the vehicle body 5 is performed by operating a switch provided on the handle panel 17 using a forward / reverse drive motor. The grounding ring 3 is mounted on the tip of an arm 28 that is pivoted up and down around a helical shaft 25 that is supported by the transmission case 15. By operation, it can be moved down against the spring of the upper bullet and brought into contact with the traveling road surface. The shaft 29 of the grounding wheel 3 is transmitted between the spiral shaft 25 by an endless transmission mechanism such as a belt 31, and the ground shaft 3 rotates in contact with the spiral shaft 25 to rotate the left and right rear wheels 2, 2. The tread interlocking mechanism 4 which can change the tread of this to wide and narrow is comprised. The tread of the left and right rear wheels 2 is adjusted by switching the vehicle body 5 forward and backward by operating a forward / reverse switching switch provided on the handle panel 17, so that the ground wheel 3
Since the rotation direction of the ground is switched between forward rotation and reverse rotation, the spiral shaft 25
During forward rotation, the rear wheel 2 is moved outward to widen the tread, and during reverse rotation, the rear wheel 2 is moved inward to narrow the tread. Such a left-right movement of the rear wheel 2 is performed together with the drive transmission of the axle 1 by the differential shaft 21, so that the rear wheel 2
Therefore, the tread change by the grounding wheel 3 can be performed smoothly.

[Brief description of the drawings] FIG. 1 is a perspective view of a tread interlocking mechanism portion. FIG. 2 is a side view thereof. FIG. 3 is a front sectional view of a traveling transmission mechanism. FIG. 4 is a perspective view of a small vehicle. [Explanation of symbols] 1 axle 2 Rear wheels 3 Grounding wheel 4 Tread interlocking mechanism

──────────────────────────────────────────────────── ─── Continued from the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B60B 35/10 A61G 5/02 A61G 5/04

Claims (1)

(57) Claims: (1) Rear wheels (2), (2) mounted on left and right end portions of an axle (1) driven by an electric motor (M) so as to be movable left and right. ) is provided, and ground to the ground drives the contact <br/> locations steerable ground wheels (3) while forward and backward of the vehicle body Torre <br/> head interlock mechanism (4) to be tread changed via the A rear wheel tread change device for small vehicles.