JP3961612B2 - Tensioner lever - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a tensioner lever suitable for pressing and biasing with a tensioner to appropriately maintain the tension of the transmission chain.
[0002]
[Prior art]
Conventionally, the shoe member mounting means of the tensioner lever is, for example, as disclosed in Utility Model Registration No. 2519476, although measures have been taken to prevent lifting and lateral swing, before and after the transmission chain slides. There is no particular consideration given to the measures for preventing looseness in the direction, that is, the longitudinal direction of the tensioner lever.
That is, as shown in FIG. 5, the tensioner lever L is urged against the transmission chain C, which is endlessly suspended by the tensioner T and rotating in the direction of the arrow, around the swinging fixed shaft A, and the tension of the transmission chain C is increased. It is something that is properly held.
[0003]
As shown in FIG. 6, the tensioner lever L is configured by fitting and mounting a resin shoe member L2 on an aluminum lever main body L1, and the shoe member L2 is a rocking base end of the lever main body L1. Engagement pieces F1, F2, and F3 for holding one side edge of the claw part F and the lever body L1 to be engaged with the shoulder S, and an other side edge of the lever body L1 and the engagement piece F4 for holding the other side edge And a protrusion (not shown) that engages with a notch (not shown) formed in the base, and the sliding movement of the shoe member L2 in the B direction relative to the lever body L1, the lift in the E direction, and the D direction Prevents rolling to the side.
[0004]
[Problems to be solved by the invention]
In the prior art described above, the lifting and rolling of the shoe member L2 are prevented by the engaging pieces F1, F2, F3 and F4, and the slip in the B direction accompanying the chain progression of the shoe member L2 with respect to the lever body L1 is prevented by the claw portion. Although it is prevented by F, the shoe member L2 slides not only in the B direction but also in the anti-B direction due to the vibration and the fluctuation of the rotational speed accompanying the high speed rotation of the transmission chain C, and the shoe member L2 reciprocates. The repeated impact noise accompanying the movement is generated not only between the claw portion F and the engagement pieces F1 to F4 and the lever body L1, but also due to the repeated impact, the claw portion F and the engagement piece of the shoe member L2. F1 to F4 may be damaged or lost, and the shoe member L2 may fall off the lever body L1.
[0005]
[Means for Solving the Problems]
Accordingly, the invention according to claim 1 includes a shoe member having a shoe surface formed on the surface thereof, the surface of which is pressed and biased about the swinging fixed shaft, and a lever body that fits and attaches the back surface of the shoe member. A tensioner lever that is pressed and urged by a tensioner to properly maintain the tension of the transmission chain, and the shoe member includes an engagement protrusion that fits into a locking groove formed in the lever body. And an anti-lifting holding portion that engages with a thermal expansion / contraction absorbing gap at the swing free end of the lever main body, and engages with a shoe member that is fitted in the locking groove of the lever main body. In the invention according to claim 2, the protrusion and the swing base end of the lever main body are connected by a shaft pin disposed on the shoe surface side from the swing fixed shaft position. In addition to the configuration of the invention according to According to a third aspect of the present invention, there is provided the invention according to the third aspect, in which the lateral shake prevention pieces that are engaged with the notch concave portions provided in the both side edges of the lever body are projected from the both side edges of the shoe member. Or in addition to the structure of the invention which concerns on Claim 2, the said subject is solved by the said lever main body being a product made from aluminum, and the said shoe member being resin.
[0006]
[Action]
By connecting the engaging protrusion of the shoe member inserted into the locking groove of the lever body with the pivot base end of the lever body with the shaft pin, the engaging protrusion of the shoe member is also locked to the lever body. By fitting in the concave groove, reciprocal sliding vibration in the longitudinal direction of the shoe member is prevented, and even if a difference in thermal expansion due to the difference in material between the lever body and the shoe member occurs in the longitudinal direction of the tensioner lever, the lever body A relative sliding movement in the longitudinal direction of the tensioner lever is allowed by a thermal expansion / contraction absorbing gap interposed between the swing free end of the tension member and the lifting prevention holding portion of the shoe member.
[0007]
【Example】
FIG. 1 is an assembly explanatory view of a first embodiment of the present invention, in which FIG. 1 (A) is a perspective view of a shoe member 1A, and FIG. 1 (B) is a perspective view of a lever body 1B. FIG. 3C is an assembly front view of the tensioner lever 1.
[0008]
The resin shoe member 1A has a front surface 2A that is pressed and urged against the transmission chain and an engaging protrusion 3A that protrudes in the longitudinal direction of the back surface. The aluminum lever body 1B has an engaging protrusion 3A. Is engaged, and the shoe member 1A has an engaging portion 4A fitted to a shoulder portion 4B formed at a swing base end portion of the lever main body 1B and a swing of the lever main body 1B. A lifting prevention holding portion 5A that is engaged with the free end 5B with the thermal expansion / contraction absorbing gap 6 interposed therebetween is formed, and the engaging protrusion of the shoe member 1A engaged with the engaging groove 3B of the lever body 1B. 3A is connected to the rocking base end portion of the lever main body by a shaft pin 7 inserted into the shaft hole 7 '. As shown in FIG. 3C, the shoe member 1A is fitted and attached to the lever main body 1B. Yes.
[0009]
Therefore, the shaft pin 7 prevents the shoe member 1A from reciprocatingly sliding in the longitudinal direction on the lever body 1B, and the engaging protrusion 3A of the shoe member 1A fitted in the locking groove 3B of the lever body 1B. Prevents the shoe member 1A from sideways, and the shoe member lifting prevention holding portion 5A holding the swinging free end 5B of the lever body 1B prevents the shoe member 1A from rising and thermally expands and contracts. The absorption gap 6 absorbs a difference in expansion and contraction in the longitudinal direction due to a difference in expansion coefficient between the resin shoe member 1A and the aluminum lever main body 1B, so that the lifting prevention holding portion 5A of the shoe member 1A and the lever main body 1B Engagement with the swinging free end 5B is ensured.
The convex portion P formed on the back surface of the lever main body 1B is a pressing portion of the pressing biasing rod R of the tensioner T.
[0010]
FIG. 2 is an assembly explanatory view of the second embodiment of the present invention, and an engaging ridge 13A having a notch 12A protrudes in the longitudinal direction of the back surface of the shoe member 11A, and the engaging ridge 13A. Is fitted into a dividing locking groove 13B provided in the longitudinal direction of the lever main body 11B, and the locking groove dividing part 12B is engaged with the notch 12A of the shoe member.
[0011]
In the shoe member 11A, a thermal expansion / contraction absorbing gap 16 is interposed between an engaging portion 14A fitted on a shoulder portion 14B formed on a swing base end portion of the lever body 11B and a swing free end 15B of the lever body 11B. 15A of lifting prevention holding parts to be engaged are formed.
Then, the engaging protrusion 13A of the shoe member 11A fitted in the locking groove 13B of the lever body 11B is connected to the swing base end portion of the lever body 11B by the shaft pin 17 inserted into the shaft hole 17 ′. Yes.
[0012]
The notch 12A of the shoe member 11A reinforces the preventing force against the reciprocating sliding vibration in the longitudinal direction of the shoe member 11A by engaging the locking groove dividing portion 12B of the lever main body 11B.
[0013]
FIG. 3 is an assembly explanatory view of a third embodiment of the present invention, wherein a split locking groove 23B is formed in the rocking base end of the lever main body 21B, and a shoe fitted and attached to the lever main body 21B. The member 21A is formed with an engaging protrusion 23A that fits into the dividing locking groove 23B and a notch 22A into which the locking groove cutting part 22B of the lever body 21B is engaged.
Then, the engaging ridge 23A of the shoe member 21A fitted in the locking groove 23B of the lever main body 21B is connected to the swing base end of the lever main body 21B by the shaft pin 27 inserted into the shaft hole 27 ′. The
[0014]
Further, in the shoe member 21A, the thermal expansion / contraction absorbing gap 16 is provided at the engagement portion 24A fitted to the shoulder portion 24B formed at the swing base end portion of the lever body 21B and the swing free end 25B of the lever body 21B. An anti-lifting holding portion 25 </ b> A that engages with each other is formed.
Then, lateral shake prevention pieces 26A are arranged in a staggered manner on both side edges of the shoe member 21A, and the lateral shake prevention pieces 26A are engaged with the notch recesses 26B of the lever main body 21B.
[0015]
Further, in FIGS. 2 to 3, the engagement surfaces 13C and 23C of the engagement protrusions of the shoe member and the engaged surfaces 13D and 23D of the engagement groove of the lever body are the back surface of the shoe member and the surface of the lever body. On the other hand, by forming a substantially perpendicular vertical plane, the sliding vibration of the shoe member in the direction opposite to the chain traveling direction with respect to the lever body is reliably prevented.
[0016]
【The invention's effect】
In the present invention, the shoe member and the swing base end of the lever body are connected by the shaft pin disposed on the shoe surface side from the swing fixed shaft position to prevent the shoe member from vibrating back and forth in the chain direction. Particularly preferably, the front and rear vibration preventing action of the shoe member is reinforced by engaging the locking groove cutting portion of the lever main body into the notch portion of the engaging protrusion of the shoe member.
In addition, the locking protrusions of the shoe member are fitted into the locking grooves of the lever body, thereby allowing thermal deformation in the longitudinal direction between the shoe member and the lever body and protruding from both side edges of the shoe member. It is possible to further reinforce the preventive action of the anti-swaying piece of the shoe member engaged with the notch portion of the lever body.
Further, the lifting prevention holding portion of the shoe member that holds and locks the swinging free end of the lever body has a thermal deformation difference due to the difference in material between the shoe member and the lever body due to the presence of the thermal expansion / contraction absorption gap. By absorbing it, the latching free end of the lever main body can be securely held and the lifting-preventing action can be maintained.
[0017]
Further, the lateral vibration prevention pieces that engage with the notch recesses provided in the both side edges of the lever body protrude from the both side edges of the shoe member, thereby preventing the longitudinal reciprocating sliding vibration of the shoe member relative to the lever body. In addition, the roll prevention piece is prevented from being damaged or broken due to reciprocating vibration, and a tensioner lever having a long service life can be obtained.
[Brief description of the drawings]
1A is a perspective view of a shoe member, FIG. 1B is a perspective view of a lever body, and FIG. 1C is a perspective view of a lever body; FIG. 5 is a front view of a tensioner lever assembled by fitting and fitting members.
2A is a perspective view of a shoe member, FIG. 2B is a perspective view of a lever main body, and FIG. 2C is a perspective view of the lever main body. FIG. 5 is a front view of a tensioner lever assembled by fitting and fitting members.
3A is a perspective view of a shoe member, FIG. 3B is a perspective view of a lever main body, and FIG. 3C is a perspective view of the lever main body. FIG. 5 is a front view of a tensioner lever assembled by fitting and fitting members.
FIG. 4 is a diagram illustrating use of a tensioner lever.
FIG. 5 is a perspective view showing a conventional tensioner lever.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Tensioner lever 1A, 11A, 21A, 31A ... Shoe member 1B, 11B, 21B, 31B ... Lever main body 3A, 13A, 23A, 33A ... Engagement protrusion 3B, 13B, 23B, 33B ... Locking grooves 5A, 15A, 25A, 35A ... Lifting prevention holding parts 6, 16, 26, 36 ... Thermal expansion / contraction absorbing gaps 7, 17, 27 ... Shaft pins 26A , 35A ... Roll prevention piece 26B, 35B ... Notch recess 32A ... Locking claw part 32B ... Locking recess

Claims (3)

It consists of a shoe member with a shoe surface formed on the surface that is pressed and urged around the swinging fixed shaft on the transmission chain, and a lever body that fits and attaches the back surface of the shoe member. In the tensioner lever that holds the transmission chain tension properly,
The shoe member is provided with an engaging ridge that fits into a locking groove formed in the lever body, and is engaged with a swing free end of the lever body to engage with a thermal expansion / contraction absorbing gap. It has a holding part,
The engaging protrusion of the shoe member inserted in the locking groove of the lever body and the swing base end of the lever body are connected by a shaft pin disposed on the shoe surface side from the swing fixed shaft position. Tensioner lever featuring   2. The tensioner lever according to claim 1, wherein a lateral runout prevention piece that engages with a notch recess provided in both side edges of the lever main body protrudes from both side edges of the shoe member.   The tensioner lever according to claim 1 or 2, wherein the lever body is made of aluminum, and the shoe member is made of resin.

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