JPH01176830A - Transmission endless belt - Google Patents

Abstract

PURPOSE:To reduce noise so as to aim at enhancing durability of a belt and a pulley by disposing a retainer between first and second blocks, and by providing a bridging section having a resilient part for positioning the belt in the longitudinal direction thereof. CONSTITUTION:A retainer 40 is disposed between first and second blocks 31, 32, and is positioned since its projections 42 and resilient members 41 make into contact with the first and second blocks 31, 32 in the longitudinal direction. Further, its horizontal section 44 abuts against the first block radially outward while abutting against a link train radially inward so as to position the retainer 40. In the widthwise direction, the outermost surface of the link train abuts against an arm part 6 so as to position the retainer 40. Thus, it is possible to enhance the durability of a belt and a pulley.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an endless belt for power transmission, and more particularly to an endless belt for a chain-type continuously variable transmission in which a large number of links are connected in an endless manner.

(Prior Art) Conventionally, as a technique in this field, there has been one disclosed in, for example, Japanese Patent Application Laid-Open No. 59-99143.

The configuration will be explained below using figures.

FIG. 7 is a partial perspective view of such a conventional transmission chain;
FIG. 8 is a perspective view of the holding clip of the transmission chain.

As shown in the figure, the transmission chain l has links 3 stacked one on top of the other alternately and has round pins (joint members).
It has a set of links 2 connected by 4. Each round pin 4 is received in a group of staggered and aligned openings 5 in the link 3. A retaining clip 6 is used to retain the round pin 4. This retaining clip 6 is made of metal or plastic and has a roughly C shape, and as shown in FIG. 8, this clip 6 is arranged so that it extends to the chain width dimension at the joint of the round pin 4. has been done.

The clip 6 also has a central, generally straight back portion 7 of sufficient length to extend across the width of all the links of the two superimposed sets of links. Furthermore, the clip 6 has a pair of depending arms 8, each depending
extend from each end perpendicular to the back 7 and parallel to the outermost link of the respective link set.

Each depending arm 8 has a free end 9 which each engages a round bottle 4 passing through a set of staggered links 2 at the location of the retaining clip 6;
Alternatively, it is adapted to engage with a part of the side surface of the outermost link 3.

(Problems to be Solved by the Invention) However, in the conventional endless belt for power transmission described above, the route of the belt winding around the pair of pulleys is polygonal, so the belt between the driving pulley and the driven pulley is The straight part of the string vibrates.

Since no measures have been taken to suppress this string vibration, noise may be generated due to collision between the pulley and the block when the pulley bites into the block of the belt, or collision between the block and the retaining clip, and the durability of the belt and pulley may be reduced. This caused the problem that the

The present invention eliminates the above-mentioned problems, suppresses string vibrations in the straight belt portion between the driving pulley and the driven pulley, and prevents collisions between the bobbies and the blocks when the bobbies bite the blocks of the belt, and prevents collisions between the blocks and the retainers. An object of the present invention is to provide an endless belt for power transmission that can eliminate collisions between the belts and the belts, reduce noise generation, and improve the durability of the belt and pulleys.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention has a substantially trapezoidal front shape, a small opening and one or both of two cutouts. and a belt having first and second blocks arranged in a line in the longitudinal direction of the belt, each having a pin engagement groove, and one or more link rows connected endlessly by a common pin; An endless transmission belt comprising a retainer that holds both ends of the pin to prevent the pin from falling off the belt, the retainer being disposed between first and second blocks, and the belt a span section having an elastic section for positioning in the longitudinal direction; a horizontal section disposed between the link row and either the first or second block for positioning in the radial direction; and both ends of the pin. and arm portions that hold the portion.

(Operations and Effects of the Invention) According to the present invention, configured as described above, the retainer suppresses chordal vibration of the straight portion of the belt between the driving pulley and the driven pulley. Noise caused by collision between the block and retainer can be reduced, and the durability of the heald and pulley is improved.

Furthermore, the elastic portion of the retainer can absorb the impact of the collision between the belt block and the retainer, thereby reducing noise.

Further, the retainer and the block, the retainer and the pin, and the block and pin and the link piece are smoothly held together, and it is suitable as an endless heald for a continuously variable transmission for a vehicle that can be operated at high speed and for a long period of time.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

Fig. 1 is a partially cutaway side view of an endless transmission belt showing an embodiment of the present invention, Fig. 2 is a sectional view showing the endless transmission belt in a cut state, and Fig. 3 is a cross-sectional view of the endless transmission belt. FIG. 4 is a perspective view of the retainer, and FIG. 4 is a top view of the retainer.

The structure of the endless transmission belt of the present invention will be explained with reference to FIGS. 1 to 4.

As shown in FIG. 1, the endless transmission belt 30 includes a first block 31, a second block 32, a link piece 33 connecting them, a pin 34 attached to the link piece, and the first block 31. A retainer 40 is provided for positioning the second block 32 and the link row and for preventing string vibration of the straight portion of the belt, as well as for preventing the pin 34 from slipping off.

The specific configuration of each of these elements will be explained below.

As shown in FIG. 2, the first block 31 has a substantially trapezoidal front shape, an opening 35 in the center, cutouts 36a on both sides,
36a is provided, the pillars 31a, 31a, the upper bridging part 3
1b and a lower bridging portion 31c are formed and arranged in the width direction of the belt. Moreover, the upper end surface 3 of the cutout portions 36a, 36a
1d and 31d to form a transition section 31e.

316 and side end surfaces 31f, 31f, enlarged portions 31g, 31g are formed at the upper portions of both ends. Furthermore, the cutout portion 36a
.

36a is connected to the lower end surfaces 31h, 31h, and has a transition part and side ends [31f, 31i; an enlarged part 31 at the bottom of both ends;

31j is formed. The contact surfaces of the side end surfaces 31f, 31f and 31i, 31i are located on the contact surface 38 so as to smoothly contact the driving pulley and the driven pulley.

That is, the front shape of each block is approximately trapezoidal.

On the other hand, a pin engaging groove 37 (see FIG. 1) is formed in the side surface of the central portion of the first block 31.

The second block 32 has the same shape as the first block 31, and is arranged in parallel with the first block 31 so that the pin engaging grooves formed on the side faces of the central portion thereof face each other.

Two sets of link pieces 33 are arranged alternately in the longitudinal direction of the belt, and as shown in FIG. They are arranged one on top of the other in the direction and form a link row.

The pins 34 have a generally cocoon-shaped cross section (see FIG. 1) and are rod-shaped, and when two pins are combined, they are held together in the pin engagement grooves of each of the blocks described above and engaged with the link rows described above.

Next, the structure and operation of the retainer of the present invention will be explained in detail.

The retainer 40 has a first block 31 and a second block 32.
(See FIG. 1), and as shown in FIGS. 3 and 4, an elastic section 41 that is curved so as to protrude in the longitudinal direction of the belt, and elastic sections 41 on both sides of the elastic section 41. a vertical portion 43.43 having a protrusion 42.42 protruding in the opposite direction; The upper end surfaces 31d and 31d of the cutout parts 35a and 36a of 31 and the link piece 3
horizontal portions 44, 44 disposed on both left and right sides between the upper end surface of the link row consisting of the horizontal portions 44, 44, and the stepped portions 4 extending substantially vertically downward from the horizontal portions via curved transition portions 46a, 46a;
Arm portion 46.46 that contacts both ends of pin 34 at 5.45
Consists of.

Further, the retainer 40 is positioned by the projections 42, 42 and the elastic portion 41 coming into contact with the first block 31 and the second block 32 in the longitudinal direction of the belt, and the retainer 40 is positioned by the first block 31 in the radial outward direction. , is positioned inward in the radial direction by the horizontal portions 44.44 abutting against the link rows, and in the width direction by the arm portions 46.46 abutting against the outermost surfaces of the link rows. Said protrusion 42.
42 and the elastic part 41 maintain the gap between the belt outer periphery between the first block 31 and the second block 32 at a certain value or more, thereby preventing the belt straight section from deflecting in the inner circumferential direction and effectively suppressing string vibration. suppress. Furthermore, the elastic portion 41 absorbs the impact of the collision between the block and the retainer.

Further, the transition portions 46a, 46a of the retainer described above and the first
The transition portions 31e and 31e of the blocks engage with each other on curved surfaces and cooperate smoothly.

FIG. 5 is a perspective view of a retainer showing a second embodiment of the present invention.

In this embodiment, the retainers 50 extend inward in the width direction of the belt from both ends of the span section 52 above the span section 52, and each free end thereof extends in the longitudinal direction of the belt. Curved elastic part 51.5
1, a vertical spanning portion 52 having protrusions 53.53 protruding in the opposite direction to the elastic portions on both sides of the elastic portion 51.51;
A horizontal portion 54° 54 similar to the first embodiment, and a stepped portion 55.
55 and arm portions 56 and 56, and performs the same function as the first embodiment.

FIG. 6 is a perspective view of a retainer showing a third embodiment of the present invention.

In this embodiment, the retainer 60 is located at the center in the width direction of the belt, and includes an elastic portion 61 that extends upward in the longitudinal direction of the belt, and an elastic portion that protrudes in the opposite direction to the elastic portions on both sides of the elastic portion 61. It consists of a vertical spanning part 62 having raised protrusions 63.63, a horizontal part 64.64 similar to the first embodiment, and arm parts 66, 66 having stepped parts 65.65. It has the same effect as the example.

Note that the present invention is not limited to the above embodiments,
Various modifications are possible based on the spirit of the present invention, and these are not excluded from the scope of the present invention.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view of an endless transmission belt showing an embodiment of the present invention, Fig. 2 is a sectional view showing the endless transmission belt in a cut state, and Fig. 3 is a cross-sectional view of the endless transmission belt. FIG. 4 is a perspective view of the retainer, and FIG. 5 is a top view of the retainer.
The figure is a perspective view of a retainer showing a second embodiment of the present invention.
The figure is a perspective view of a retainer showing a third embodiment of the present invention.
This figure is a partial perspective view of a conventional transmission chain, and FIG. 8 is a perspective view of a holding clip of the transmission chain. 30... Endless transmission belt, 31... First block, 32... Second block, 33... Link piece, 34
... Pin, 40°50, 60 ... Retainer, 41.
51.61...Elastic part, 42.53°63...Protrusion, 43...Vertical part, 44.54.64...Horizontal part,
45°55, 65...Stepped part, 46.5 (i, 66
...Arm part, 52.62...Band part.

Claims (7)

[Claims] (1) It has a substantially trapezoidal front shape, has at least one opening and one or both of two cutouts, and has a pin engagement groove arranged in a line in the longitudinal direction of the belt. a belt in which first and second blocks and one or more link rows are endlessly connected by a common pin; and a retainer that holds both ends of the pin to prevent the pin from falling off the belt. An endless belt for power transmission, the retainer being disposed between the first and second blocks, a span section having an elastic section for positioning the belt in the longitudinal direction, a link row, and a first or second block. An endless belt for power transmission, characterized in that it is provided with a horizontal part that is disposed between either one of the second blocks and performs radial positioning, and arm parts that hold both ends of the pin. (2) The endless belt for power transmission according to claim 1, wherein the passing portion includes an elastic portion that is curved so as to extend in the longitudinal direction of the belt. (3) Endless transmission according to claim 2, wherein the connecting portion is provided with protrusions projecting on both widthwise outer sides of the elastic portion in a direction opposite to the direction in which the elastic portion extends. belt. (4) An elastic portion is provided above the passing portion, extending from both ends of the passing portion towards the inner side in the width direction of the belt, and each free end of which is bent so as to extend in the longitudinal direction of the belt. An endless transmission belt according to claim 1. (5) The endless belt for power transmission according to claim 4, further comprising a protrusion that protrudes in a direction opposite to a direction in which the elastic portion extends in the spanning portion. (6) The endless belt for power transmission according to claim 1, further comprising an elastic portion that extends from the connecting portion to above the connecting portion and is bent so as to extend in the longitudinal direction of the belt. (7) The endless belt for power transmission according to claim 6, wherein the connecting portion includes a protrusion that protrudes in a direction opposite to the direction in which the elastic portion extends.