JPH04136343U - Timing belt - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the durability of timing belts. [Structure] Two linear tensile bodies 12 arranged in parallel,
13, a large number of square metal frames 15 are arranged at predetermined intervals along the longitudinal direction, and each side portion 15a, 15a is fixed to the tensile members 12, 13, and these are used as a core material to form a belt. A through hole is formed inside the metal frame to mesh with the teeth of the timing belt pulley.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a timing belt.

0002

[Conventional technology]

When the camshaft is driven by the rotation of the engine crankshaft, the Chains and gears are used as a means of transmitting the rotation of the crankshaft to the camshaft. , belts, etc. are used. Chains and gears require constant lubrication. However, recently toothed belts (hereinafter referred to as belts), which are quiet and do not require lubrication, are (referred to as a "timing belt").

0003 Figure 5 shows a camshaft drive system that uses a timing belt. Timing belt drive pulley 2 fixed to shaft 1, intake side and exhaust side between the timing belt driven pulleys 3 and 4 fixed to each camshaft of The timing belt 5 is wound around. In addition, this timing belt 5 is A predetermined tension is applied by the belt tensioner 6 to prevent loosening. has been done. Of course, these timing belt pulleys 2 to 4 are toothed pulleys, The timing belt 5 (FIG. 6) is a toothed belt.

0004 The timing belt 5 usually has a tensile material 7 such as a wire as a core material, as shown in FIG. A canvas 8 is placed on the inner surface (tooth side) that contacts the pulley, and rubber 9 is cast (poured). It is formed by vulcanization.

[0005]

[Problem that the idea aims to solve]

However, the conventional toothed timing belt 5 has teeth on each timing pulley. When meshing with the timing belt 5, stress is concentrated at the base of the teeth 5a of the timing belt 5, The problem is that the tooth 5a falls off from the root and is easily damaged, as shown by diagonal lines in Figure 7. There is a problem.

[0006] This invention was created in view of the above points, and is a method that prevents tooth loss. The purpose is to provide timing belts.

[0007]

[Means to solve the problem]

In order to achieve the above object, the present invention provides a timing belt with multiple teeth. In a timing belt that is passed between pulleys and transmits power, two linear Tensile members are arranged in parallel at predetermined intervals, and a square metal frame is placed between them along the longitudinal direction. A large number of them are arranged at predetermined intervals, and each side part is fixed to each of the above-mentioned tensile bodies, and these are connected to the core material. A through hole is formed in each metal frame to connect the teeth of the timing belt pulley. It has a structure with interlocking holes.

[0008]

[Effect]

When the timing bell is wound around the timing belt pulley, Teeth of the timing belt pulley mesh with holes in the timing belt. timing The belt has holes instead of teeth, so no missing teeth occur. to this The durability of the timing belt is further improved.

[0009]

【Example】

An embodiment of the present invention will be described below in detail with reference to the accompanying drawings. In FIG. 1, the timing belt 10 includes a plurality of tensile members, for example, four tensile members as core members. The wires 11 to 14 are arranged in parallel at predetermined intervals, and the wires 11, 12, 13 and 14 is narrow, and the two inner wires 12 and 13 are set wide apart. A metal frame 15 is placed between the inner wires 12 and 13 at a predetermined interval along the longitudinal direction. There are many locations in the area. The metal frame 15 is attached to a timing belt pulley 18 (see Fig. 3) is for forming a hole that fits into the tooth 18b, and has a square shape, for example. The inner diameter d between the opposing front and rear sides 15a, 15a is the timing belt. The spacing is 1/2 of the pitch p of the teeth 18b of the pulley 18. and next to each other Each metal frame 15 has an interval d' narrower than the inner diameter d by the width of both side parts 15a, 15a. (<d) along the longitudinal direction, with the left and right side parts 15b and 15b inside. It is welded to the two wires 12 and 13 on the side. These metal frames 15 are also used as a core material. It will be done.

0010 These wires 11 to 14 are formed in an annular shape and are aligned with a large number of metal frames 15. It is stored in a mold (not shown) in the body, and the rubber member is inserted like a conventional timing belt. It is molded into an annular flat belt and then vulcanized. Also, A canvas is provided on the inner peripheral surface that comes into contact with the timing belt pulley 18. and , the square hole 10a formed by each metal frame 15 is a tooth hole, and the pitch thereof is 2d. , so as to match the pitch p of the teeth 18b of the timing belt pulley 18. It has become.

[0011] On the other hand, as shown in FIG. 3, the width of the timing belt pulley 18 is It is set to have the same width as the belt 10, and teeth 18b are formed at a pitch p on the outer peripheral surface 18a. It is. The teeth 18b have a square shape and are connected to the hole 10a of the timing belt 10. The tooth height h is larger than the thickness t of the timing belt 10. is also set slightly high (h>t). In addition, the teeth of the timing belt pulley 18 18b is exaggerated for clarity. This timing belt The pulley 18 is, for example, a driven pulley. drive side tie A timing vector pulley (not shown) is also formed similarly to the timing bell pulley 18. ing.

0012 The action will be explained below. As shown in FIG. 4, the timing belt 10 is connected to a timing belt pulley 18. It is hung between the drive-side timing belt pulley (not shown), and the hole 10a is , meshes with the corresponding teeth 18b of the timing belt pulley 18, and from the hole 10a. It stands out slightly. Further, the inner surface of the timing belt 10 is It is in contact with the outer circumferential surface 18a of the rotary pulley 18. In this way, the tamming bell The belt 10 and the timing belt pulley 18 mesh with each other. Timing belt 10 hole 10a and the teeth of the driving side tamming belt pulley are also engaged in the same manner as described above. There is.

[0013] The timing belt 10 rotates when the drive-side timing belt pulley rotates. It is pulled in the rotational direction and rotates, causing the timing belt pulley 18 to rotate. Ta The timing belt 10 is a flat belt with no teeth, so it is a timing belt. When meshing with the top pulley 18, the bending stress of the cross section is small and the fatigue strength is large. Also , the hole 10a has great strength because it is reinforced by the metal frame 15, and this connection As a result, the durability of the timing belt 10 is improved.

[0014]

[Effect of the idea]

As explained above, according to the present invention, a timing belt pulley with multiple teeth In the timing belt that is passed between the belts and transmits power, two linear tensile members are arranged in parallel at a predetermined interval, and a square metal frame is placed between them along the longitudinal direction at a predetermined distance. A large number of them are arranged at intervals, and each side part is fixed to each tensile body, and these are used as a core material. A through hole is formed inside each metal frame to mesh with the teeth of the timing belt pulley. This structure reduces bending stress in the belt cross section and increases fatigue strength. It has advantages such as improved durability and easy reinforcement.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of a timing belt core material according to the present invention.

FIG. 2 is a plan view of a timing belt formed from the core material of FIG. 1;

3 is a partially cutaway plan view of a timing belt pulley used in the timing belt of FIG. 2; FIG.

4 is a sectional view of a main part showing a state in which the timing belt of FIG. 2 is wound around the timing belt pulley of FIG. 3; FIG.

FIG. 5 is a perspective view showing a camshaft drive system of an engine using a conventional timing belt.

FIG. 6 is a perspective view of the timing belt of FIG. 5;

7 is a partial perspective view showing the timing belt of FIG. 6 in a state where teeth are missing; FIG.

[Explanation of symbols]

10 Timing belt 11-14 wire 15 Gold frame 18 Timing belt pulley

Claims (1)

[Scope of utility model registration request] Claim 1: In a timing belt that is wound between a plurality of toothed timing belt pulleys to transmit power, two linear tensile members are arranged in parallel at a predetermined interval, and between these A large number of square metal frames are arranged at predetermined intervals along the longitudinal direction, and each side part is fixed to each of the above-mentioned tensile bodies, and these are used as a core material to form a belt, and the inside of each metal frame is made into a through hole. A timing belt characterized by having holes that mesh with teeth of a timing belt pulley.