JPH0512801U - Friction transmission chain - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose is to suppress noise and impact noise of a friction transmission chain for continuously variable transmission, and to increase the durability of struts and link plates. [Structure] The pitch of the friction transmission chains C1 and C2 inserted in the left and right cavities of the strut is the same phase, and the chain transmission strut in which both the left and right wings are locked to the link plates of each chain and the chain transmission strut are interposed. And a friction force transmission strut having a friction force transmission surface interposed between the chain transmission strut and the spacer strut and having a friction force transmission surface sandwiched between the V groove transmission surfaces of the driving pulley and the driven pulley. ..

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a friction transmission chain for continuously variable transmission.

[0002]

[Prior Art]

 As disclosed in Japanese Patent Laid-Open No. 1-316544, a conventional friction transmission chain has a plurality of struts having an I-shaped cross section, and transmission chains having different 1/2 pitch phases are inserted in the left and right cavities. A plurality of struts are superposed and aligned in the longitudinal direction of the chain, and the transmission chain is endlessly suspended between a pair of spaced apart drive V pulleys and driven pulleys. Friction transmission is performed by compressive frictional force with the conical transmission surface of the V pulley, and continuously variable transmission is performed by complementarily expanding and contracting between the conical transmission surfaces of both pulleys.

Since the upper and lower wings of the strut that are fitted into the notch recesses formed in the central portions of the upper and lower sides of the link plate have their transmission chain pitches deviated by 1/2. Since the cutout recess is also displaced by 1/2 pitch, the central cutout recess of the link plate L1 of one of the transmission chains C1 has the upper and lower wings of the strut F1 respectively, as shown in FIGS. The left side part is fitted and locked, but the right side part is not fitted into the central cutout recess of the link plate L2 of the other transmission chain C2 (see FIG. 7), and the link plate L2 of the other transmission chain C2 is The right side of each of the upper and lower wings of the strut F2 is fitted and locked in the central cutout, but the left side of the strut F2 is cut in the central cutout of the link plate L1 of the one transmission chain C1. In the end, one strut F1 is fitted on and engaged with one transmission chain C1 only on the left side of the lower wing, and the other strut F2 is fitted and engaged on the other transmission chain C2. Only the right side portion of the wing portion is fitted and engaged. The strut F3 interposed between the struts F1 and F2 is a strut for a spacer that fills the gap between the struts F1 and F2 and does not engage with any transmission chain as shown in FIG. ..

Therefore, in friction transmission, both end surfaces T1 and T1 of the lower wing portion of the strut F1 are pinched by the V-groove transmission surface of the driving pulley, and the rotation of the drive pulley is frictionally transmitted to the strut F1. Both ends of the lower blade are pressed by the V-groove transmission surface of the drive pulley to frictionally transmit the rotation of the drive pulley to the strut F2. The strut F1 is engaged with the transmission chain C1 and the strut F2 is engaged. The traction force is transmitted to each of the transmission chains C2 to transmit the rotation to the driven pulley. By continuously expanding and reducing the V groove interval of the drive pulley and the V groove interval of the driven pulley, continuously variable transmission is performed. ing.

[0005]

[Problems to be solved by the device]

 In the above-mentioned prior art, by shifting the pitch of each transmission chain inserted in the left and right cavities of the strut by 1/2, the fluctuation of the winding radius of the pulley is reduced, and both outer end surfaces of the lower wing of the strut are reduced. While it is possible to reduce the noise by suppressing the contact noise between the (friction transmission surface) and the V-groove transmission surface of the pulley, one of the transmission chains inserted in the left and right voids of the strut in each strut. Since it engages with the chain link plate of and does not engage with the other chain link plate at all, it becomes a cantilever with a transmission load acting on only one of the left and right wings of each strut. There was a problem that the link plate was subjected to an excessive load and lacked in durability.

[0006]

[Means for Solving the Problems]

 In order to eliminate the above-mentioned drawbacks of the prior art, the present invention does not shift the pitches of the respective transmission chains inserted in the left and right cavities of the struts in the same phase without halving them, and the left and right wing portions of the struts are simultaneously formed. Friction transmission struts that have chain transmission struts that are locked to the link plates of the transmission chain and friction force transmission struts that have friction force transmission surfaces that are not locked to the link plates and that are pressed against the V groove transmission surfaces of the transmission pulley. Spacer strut for abutting the strut on the chain transmission strut.

[0007]

[Action]

 The frictional force transmission strut pressed against the V-groove transmission surface of the drive pulley receives the drive force by the drive pulley and pushes the drive force to the chain transmission strut abutting the frictional force transmission strut, The chain transmission strut is locked to the link plate and transmits its driving force to the transmission chain to drive the transmission chain endlessly. In the driven pulley, the driving force of the transmission chain is transmitted from the chain transmission strut to the friction force transmission strut, and the friction force transmission strut is transmitted to the V groove transmission surface of the driven pulley via the friction force transmission surface. The pulley is rotated.

That is, on the drive pulley side, power is transmitted by the frictional force transmission struts pushing the chain transmission struts, and the link plate follows the linear portion of the chain between the drive pulley and the driven pulley. Power is transmitted by pulling the link plate of.

[0009]

【Example】

 1 to 4 show an embodiment of the present invention, in which transmission chains C1 and C2 which are respectively inserted in the left and right cavities of a strut are endless chains which are linked by connecting pins P1 and P2 at a pitch of the same phase, It is suspended between a drive pulley (not shown) and a driven pulley (Fig. 1).

On the upper and lower sides of the central portion of the link plate 1 of each of the transmission chains C1 and C2, locking notch recesses A1, A1 'and A2, A2' of the strut are formed, and the notch recesses A1, A1 are formed. The upper and lower wings of the left and right wings of the chain transmission strut 2 are locked to'and A2, A2 '(Fig. 3).

Further, the frictional force transmission struts 3 which are not locked in the cutout recesses of the link plate 1 have the frictional force transmission surfaces 3 A and 3 B which are pressed against the V groove transmission surfaces of the driving V pulley and the driven V pulley. It is formed on both end faces of the wing (Fig. 4).

The chain transmission strut 2 is interposed between the pair of friction force transmission struts 3, and the spacer strut 4 that does not engage with the link plate is interposed between the pair of friction force transmission struts 3. The spacer strut 4 presses the chain transmission strut 2 and the frictional force transmission strut 3 together without a gap. In FIG. 2, the gap between the lower blade of the strut and the lower side of the link plate enables the winding around the V groove of the V pulley, and the gap is formed at the time of winding, that is, when transmitting the frictional force. It will not occur.

[0013]

[Effect of the device]

 According to the present invention, the pitches of the link plate connecting pins of the transmission chain that are inserted in the left and right cavities of the strut are set in the same phase, so that the left and right wings of the strut are engaged with the upper and lower sides of the link plates of the respective transmission chains. Since it can be inserted, the transmission load acts evenly on both the left and right wings of the strut, and the cantilever load is not applied to the strut and the link plate, so the durability of the strut and the link plate is increased, and The pitch of the chain transmission struts engaged with the link plates of the respective transmission chains is the same as the pitch of the struts when the phase of each chain is shifted by 1/2 pitch in the above-mentioned prior art. , Contact noise between the friction transmission surface of the strut and the friction transmission surface of the V groove that occurs when the chain is wound around the V groove of the V groove Is the same as in the prior art, noise due to string vibration of the chain it does not become larger than in the prior art.

Furthermore, since the uniform transmission load acts on both wing portions of the chain transmission strut as described above, the cause of damage to the strut is eliminated, and the chain transmission strut, the frictional force transmission strut and the spacer strut are removed. The struts have different roles, so that each strut can have an optimum shape independent of each other.

[Brief description of drawings]

FIG. 1 is an enlarged plan view of an essential part of an in-phase friction transmission chain according to an embodiment of the present invention with a partial cross section.

2 is a front view of the friction transmission chain of FIG. 1. FIG.

FIG. 3 is an enlarged side view of the chain transmission strut.

FIG. 4 is an enlarged side view of a frictional force transmission strut.

FIG. 5 shows a conventional example, and is an enlarged plan view of an essential part of a friction transmission chain which is shifted by a 1/2 pitch in a partial cross section.

6 is a front view of the friction transmission chain of FIG.

FIG. 7 shows a conventional example, and is an enlarged side view of a transmission strut that engages with only one chain.

FIG. 8 shows a conventional example and is an enlarged side view of a spacer strut.

[Explanation of symbols]

 1 link plate 2 chain transmission strut 3 friction force transmission strut 3A, 3B friction force transmission surface 4 spacer strut A1, A1 ', A2, A2' strut engagement notch C1, C2 friction transmission chain P1, P2 connecting pin

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Nobuyuki Fujimoto 4-17 96 Tsurumi, Tsurumi Ward, Osaka City, Osaka Prefecture Tsubakimoto Chain Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A plurality of struts having an I-shaped cross section are passed through transmission chains having the same phase in the left and right cavities to superpose and align the plurality of struts in the longitudinal direction of the chain. Chain transmission struts that are locked to the center of the upper and lower sides of the link plate of the chain, spacer struts that are interposed between the chain transmission struts, and drive pulleys and driven pulleys that are interposed between the chain transmission struts and the spacer struts. A friction transmission chain comprising a friction force transmission strut having a friction force transmission surface that is pressed against a V groove transmission surface.