JPH0311103Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

This invention relates to a spare tire carrier for an automobile, and in particular to an improvement of a spare tire carrier that uses a wire rope to lift up the spare tire.

[Conventional technology]

Conventional spare tire carriers of this type include those that utilize a differential gear mechanism, as described in, for example, Japanese Utility Model Publication No. 52-28263 and Japanese Utility Model Application Publication No. 47-34850. By the way, in recent years, in order to improve the fuel efficiency of automobiles, efforts have been made to reduce the weight of vehicles as much as possible, and one of the ways to reduce the weight is to replace metal parts with synthetic resin materials. There is. Since the spare tire carrier is also heavy, replacing part of it with synthetic resin will greatly contribute to reducing the weight of the vehicle. In particular, the largest component of a spare tire carrier is a wheel for winding up a wire rope, and by making this wheel made of synthetic resin, it is possible to significantly reduce the weight. By the way, this wheel is integrally provided with an internal gear, which meshes with a drive gear loosely fitted on the eccentric shaft to transmit the torque for winding up the wire rope. Considering its strength, wear, etc., it is difficult to make it from synthetic resin. This has been an obstacle to reducing the weight of the spare tire carrier.

[Problem that the invention attempts to solve]

This idea was made in view of the above problems, and it is a spare tire carrier that makes it possible to make the wheel for hoisting wire ropes from resin without sacrificing the strength, wear resistance, etc. of the internal gear. The purpose is to provide

[Means for solving the problem] This invention is a spare tire carrier that uses a differential gear mechanism in which an internal gear is integrally installed on a wheel for hoisting a wire rope for suspending a spare tire. , the wheel is formed from a synthetic resin, and the internal gear is formed from a metal member cast into the wheel;
Further, the above object is achieved by fitting a metal ring to the outer periphery of the wheel at a position outside the internal gear.

[Effect]

The internal gear in this invention is made of metal and cast into a synthetic resin wheel, and the torque for hoisting the wire rope is evenly distributed and transmitted to the wheel. Since the metal ring is fitted on the outside of the wheel, problems such as wheel damage due to concentrated loads and deformation do not occur.

【Example】

Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, as shown in FIGS. 1 to 3, a wheel 12 for winding up a wire rope 10 for suspending a spare tire (not shown) is used.
In a spare tire carrier 16 using a differential gear mechanism in which an internal gear 14 is integrally provided, the wheel 12 is formed of synthetic resin, and the internal gear 14 is connected to the wheel 1.
2, formed from a metal member cast in
A metal ring 17 is fitted onto the outer periphery of the wheel 12 at a position outside the internal gear 14. The internal gear 14 is formed by punching out a thin metal plate in a wave shape. The wheel 12 is loosely fitted coaxially to the drive shaft 18 and is thereby supported by the drive shaft 18. One end of the drive shaft 18 has a notch 2 into which a winding handle (not shown) is inserted and engaged.
0 is formed, and an eccentric shaft 22 is integrally formed at the other end. A drive gear 24 that meshes with the internal gear 14 is loosely fitted into the eccentric shaft 22 so as to be freely rotatable. A thin shaft portion 28 rotatably supported by a case 26 is integrally formed at the end of the drive shaft 18 opposite to the cutout portion 20, and the thin shaft portion 28 protrudes from the case 26. At the end, pin 3
0 is fitted to form a retainer for the drive shaft 18. Reference numeral 32 in the figure is a lock plate that is integrally attached to the drive gear 24 to prevent the drive gear 24 from rotating and to enable it to swing; 34 is a lock plate that urges the lock plate 32 in one direction. 36 respectively represent guide plates for guiding the wire rope 10 into the rope groove 38 of the wheel 12. The wheel-side end of the wire rope 10 is locked to the wheel 12 by a metal fitting 40. An anchor plate 42 for placing a spare tire is attached to the other end of the wire rope 10. The drive shaft 18 is rotationally driven by the winding handle, so that the eccentric shaft 2
2 revolves around the rotation center axis of the drive shaft 18, whereby the drive gear 24 swings up and down and left and right, and for each rotation of the center of the eccentric shaft 22, the internal gear 14 and the drive gear 24 rotate. Rotates by an angle corresponding to the difference in the number of teeth. At this time, the lock plate 32 is held in contact with the case 26 and cannot be rotated, so that it is only allowed to swing vertically and horizontally together with the drive gear 24. In this way, the wheel 12 winds up the wire rope 10 with reduced speed and increased torque. Here, the internal gear 14 transmits a large torque by meshing with the drive gear 24, but since the internal gear 14 is cast into the synthetic resin wheel 12, there is no gap or play between the two. Therefore, the torque transmitted to the internal gear 14 is uniformly distributed to the wheel 12, and no concentrated load is generated on the wheel. Further, the outer portion of the internal gear 14 of the wheel 12 tends to deform outward due to the load, but since the metal ring 17 is fitted around the outer periphery, deformation is suppressed. Furthermore, since the internal gear 14 is formed by bending a thin metal plate into a wave shape as described above, it is possible to reliably transmit torque without causing any slippage with the wheel 12 despite its light weight. . The internal gear 14 can be formed by punching a thin metal plate, for example, an iron plate into a circular wave shape, or by bending it into a wave shape and endlessly welding it, so that it is possible to reduce not only the weight but also the manufacturing cost. In the above embodiment, the internal gear 14 is formed by forming a corrugated thin metal plate, but the present invention is not limited to this. This also includes the case of members. Therefore, for example, the outer surface of the internal gear 14 may have an irregular shape other than a wave shape. However, if the outer surface of the internal gear 14 is also shaped like a wave as in the above embodiment, it can be reliably integrated with the synthetic resin wheel and transmit torque.

[Effects of the invention] Since the present invention is configured as described above, it is possible to use synthetic resin for the wheel in the spare tire carrier without sacrificing the strength, wear resistance, etc. of the internal gear. It has an excellent effect of being able to reduce weight and cost.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of a spare tire carrier according to the present invention, Fig. 2 is a sectional view of a portion corresponding to the - line in Fig. 1, and Fig. 3 is a sectional view of a portion corresponding to the - line in Fig. 2. It is. 10...Wire rope, 12...Wheel, 1
4... Internal gear, 16... Spare tire carrier, 17... Metal ring, 18... Drive shaft, 22... Eccentric shaft, 24... Drive gear.

Claims (1)

[Scope of utility model registration request] In a spare tire carrier that utilizes a differential gear mechanism in which an internal gear is integrally provided on a wheel for winding up a wire rope for suspending a spare tire, the wheel is formed of synthetic resin, and the internal gear A spare tire carrier comprising a gear formed of a metal member cast into the wheel, and a metal ring fitted around the outer periphery of the wheel at a position outside the internal gear.