JP2010242957A - Differential gear and its locking device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a differential gear using steel balls available at a low cost, as improvement of a conventional one using bevel gears which is fabricated easily in structural terms, but suits neither mass production nor the practical application because of high price. <P>SOLUTION: A steel ball holding plate 10 formed rigidly to a housing and having a plurality of holes where steel balls 11a and 11b are placed, is installed between circular discs 9a and 9b arranged facing each other at the ends of shafts 8a and 8b penetrating shaft holes bored in the bottoms of two cup-shaped housing halves 1a and 1b, and springs 12a and 12b are set between the housing halves and the discs for pinching the steel balls, and the housing halves are combined and fastened to press the discs by the pressure of the springs so as to generate a slip friction between the steel balls and the two circular discs. As the housing and the steel ball holding plate are consolidated, turning the housing causes the steel balls to be pulled by the plate to trail, and the two discs rotate together, and when either disc stops, the steel balls start rolling on the stopped disc. This rolling motion is transmitted to the counter disc in free rotation to cause its rotating, and thus a differential effect generated. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a vehicle differential that travels by driving two wheels, such as a three-wheel bicycle, and to preventing idling thereof.

  Conventional differential devices are configured with a complicated mechanism using gears and the like, so the product price is expensive.

The present invention solves the problems of the conventional method and aims to supply a simple and inexpensive differential gear to a three-wheeled bicycle or the like.

  Without using any gears, the sliding friction and rolling of steel balls are applied to obtain a differential using this as a medium, and the mounted wheels prevent slipping and slipping due to mud etc. Is the one that solves

Means to solve the problem

  FIG. 1 is an external view of the present invention. 1a and 1b are main body housings of the present invention, 2 is a gear for receiving rotational power, 3 and 5 are locking devices, and 8a and 8b are rotating shafts. 2 is a cross-sectional view taken along the line AA of FIG.

    The invention is illustrated in FIG. 1a and 1b are housings, 2 is a passive gear, 3 is a lock receiving portion, 5 is a lock fitting and moves the shaft 8a in the axial direction, 6 is a protrusion of 5 lock, 7 is a groove in which a lock lever fits, 16 Is a 5 slide key, 9a and 9b are differentially generated friction plates, and 9a and 9b are hereinafter referred to as friction plates. 8a and 8b are shafts, 11a and 11b are steel balls, 10 is a steel ball holding plate that holds a plurality of steel balls and rotates around the shafts 8a and 8b, 14 is a projection of 10, and 15 is a recess in the housing It is. 12a and 12b are disc springs, and 13a and 13b are thrust bearings.

FIG. 3 is a cross-sectional view taken along the line BB in FIG. 1, and 10 holding plates hold a plurality of steel balls 11a, 11b, 11c, and 11d and are fitted into the housing 15 by the projections 14 so that the shaft 8a is pivoted. Showing as rotating

FIG. 4 is a diagram in which the present invention is actually mounted on a three-wheeled bicycle. 20a and 20b are bearings, 22a and 22b are wheels, 23 is a vehicle body, 24 is a lock lever, 25 is a tension spring, 26 is a pedal, and 27 is a pedal. Power transmission chain, 28 is handle, 29 is front wheel

Next, the differential action will be described. In FIG. 2, by tightening a plurality of tightening bolts 17 of the housings 1a and 1b, the steel balls 11a, 11b, 11c and 11d are pressed against the friction plates 9a and 9b by the disc springs 12a and 12b, and the steel balls and Friction is generated between the friction plates, and the friction plates and the steel balls are fixed. As a result, when the housing is rotated by the pedal 26, the friction plates 9a and 9b are rotated with the housing by the holding plate 10, and the wheels 22a and 22b are rotated with the housing.

If the right wheel 22b is fixed so that the right wheel 22b does not move and the pedal is turned, the plurality of steel balls 11a, 11b, 11c, and 11d are pulled by the holding plate, and the friction plate 9b fixes the friction. Starts working and rolling. Then, the steel ball rolls to the friction plate 9a while rolling, and the rotation of the steel ball 9a starts to rotate, so that a so-called differential effect occurs. Even if the left wheel 22a is fixed, the same differential effect can be obtained.

Next, the lock will be described with reference to FIGS. When the lever 24 is pulled and the lock fitting is moved to the housing and the projection 6 is inserted into the recess 4 of 1a to integrate the shaft 8a and the housing, the friction plate 9a and the steel balls 11a, 11b, 11c, 11d are fixed. Because it cannot roll, it loses the differential effect.

In snow, ice vans, mud, etc., one of the wheels may spin freely, so a differential lock to prevent slipping is performed. As described above, as described above, the lever 24 is pulled to bring the protrusion 5 into the hole 4 of the housing. As a result, the housing and the shafts 8a, 8b become a three-piece unit, and the differential is locked to prevent idling.

The 25 spring serves to keep the lock fitting 5 away from 3 since the differential lock is performed only when the wheel is idle.

The invention's effect

    Conventional differentials are manufactured using a large number of gears, but the present invention has a simple mechanism and is composed of a combination of inexpensive steel balls and disks, so material costs and processing fees are low. And with the direct driving of the housing, the wheel shaft becomes a single through shaft, so the mechanism related to the car body, chain and pedal gear is simplified and the cost of the tricycle itself is reduced. Turn is smooth and safe

BEST MODE FOR CARRYING OUT THE INVENTION

  A disc spring in the housing is used to press the steel balls against each other with the rotating receiving plate facing each other, and the rotation of the housing is transmitted to the rotating receiving friction plate by the generated frictional resistance, so that the wheel runs and the rotation load increases. To cope with this, it is possible to increase the pressure by increasing the thickness of the spacer between the disc spring and the thrust bearing. Further, if necessary, the number of steel balls is increased to reduce the pressure load per ball, the pressurizing force on the steel balls is increased, and the frictional force is increased.

  External view of the present invention   1 is a cross-sectional view taken along line AA of FIG.   1 is a cross-sectional view taken along the line BB of FIG.   Illustration of mounting the present invention on a tricycle

DESCRIPTION OF SYMBOLS 1a, 1b Housing 2 Passive gear 3 1a Housing lock part 4 1a Housing lock hole 5 Lock metal fitting 6 Lock metal projection 7 Lock lever fitting groove 8a, 8b Axle 9a 9b Friction plate 10 Steel ball holding plate 11a 11b Steel ball 11c 11d Steel balls 12a, 12b Belleville springs 13a, 13b Thrust bearing 14 Holding plate protrusion 15 Housing recess 16 Key 17 Housing tightening bolts 20a 20b Bearing bearing 22a 22b Wheel 23 Car body 24 Lock lever 25 Spring 26 Pedal 27 Chain 28 Handle 29 Front wheel

Claims (3)

  A disk is fixed to the shaft that passes through the hollow shaft in two housings that protrude from the bottom of the saddle type, and the shaft is extended to the tip of the shaft with the shaft. A holding plate for inserting steel balls is provided in a plurality of holes that rotate in connection with the housing around the protruding shaft of the shafted disc, and the steel balls are sandwiched between opposing discs, and between the disc with the shaft and the saddle type housing. A differential device having a structure in which a steel ball is pressed against a shaft disk by a disc spring provided on the shaft, and a housing is driven to transmit rotation to the shaft via the steel ball by a steel ball holding plate. A differential device that locks the differential by locking the shaft and the housing fixedly coupled to the housing by sliding a metal fitting having a protrusion that rotates in the axial direction by rotating with the shaft. A tricycle and a four-wheel vehicle to which the differential device according to claim 1 or 2 is mounted.

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