JP2003343668A - Chain slipper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chain slipper where noise occurrence is suppressed by reducing vibration transmitted from the chain slipper to a cylinder block, and durability of an elastic body is improved more than the prior art (conventional floating support type). <P>SOLUTION: The chain slipper is disposed on the loose side of a chain and oscillatably mounted to an internal combustion engine. A damping ring 70 having an insert hole 70a for passing a pin or a bolt for supporting the chain slipper on the internal combustion engine is inserted into an oscillation fulcrum of the chain slipper. The damping ring 70 comprises a first ring 71, a second ring 72, and the elastic body 73 disposed between the first ring 71 and the second ring 72. A central part of a ring shaft of a first ring facing surface 72a of the second ring 72 projects toward the first ring 71. <P>COPYRIGHT: (C)2004,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chain slipper which is arranged on a loose side of a chain and is swingably attached to an internal combustion engine. 2. Description of the Related Art Conventional chain slippers are shown in FIGS.
With reference to FIG. The chain slipper 1 is arranged on the loose side of the chain. The chain slipper 1
It is swingable about the swing fulcrum in the direction of adjusting the tension of the chain. The chain slipper 1 is directly supported by pins or bolts for assembling the chain slipper 1 to the cylinder block, as shown in FIG. 5, or has a constant or almost constant thickness as shown in FIGS. It is supported via a bush having an elastic body 2 (floatingly supported). [0005] However, the conventional chain slipper 1 has the following problems (problems). When a directly supported type chain is running, vibration and impact are generated in the chain. The vibration and shock generated in the chain are transmitted to the chain slipper 1 and transmitted to the cylinder block via pins or bolts. As a result, noise is generated from the cylinder block and the chain case. Particularly, among the vibrations and shocks generated in the chain, the vibration generated in the direction in which the chain is twisted is transmitted to the cylinder block and causes abnormal noise. Since there is the floating support type elastic body 2, vibration can be absorbed by the elastic body 2. Therefore, compared to the direct support type, the vibration of the chain slipper 1 is less likely to be transmitted to the pins or bolts. However, since the elastic body 2 has a constant or almost constant thickness,
When the elastic body 2 is pushed in a direction perpendicular to the swing axis of the chain slipper 1 and the pushing force fluctuates, the elastic body 2 deteriorates relatively early. SUMMARY OF THE INVENTION An object of the present invention is to provide a chain slipper in which vibration transmitted from a chain slipper to a cylinder block can be reduced to suppress generation of noise, and durability of an elastic body is improved compared to a conventional (conventional floating support type). [0004] The present invention to achieve the above object is as follows. A chain slipper disposed on the loose side of the chain and swingably attached to the internal combustion engine, wherein a pin or bolt for supporting the chain slipper on the internal combustion engine is inserted into a swing fulcrum of the chain slipper. A damping ring having an insertion hole, wherein the damping ring comprises a first ring;
A second ring, and an elastic body disposed between the first ring and the second ring, the center of the surface of the second ring facing the first ring in the ring axial direction. A chain slipper protruding toward said first ring. [0005] In the chain slipper of the present invention, the damping ring is inserted into the swing fulcrum, and the damping ring has an elastic body. Therefore, the vibration transmitted from the chain slipper to the cylinder block can be absorbed by the elastic body. for that reason,
Sound generation can be suppressed as compared with a case where no elastic body is provided (conventional direct support type). In addition, since the center of the second ring in the ring axial direction on the surface facing the first ring protrudes toward the first ring, when a force is applied in a direction in which the elastic body compresses, the elasticity of the second ring increases. The body is compressed only until the protruding part hits the first ring.
Therefore, the elastic body can be prevented from being deteriorated earlier (set) as compared with the conventional floating support type. Further, since the center of the second ring in the ring axial direction on the surface facing the first ring protrudes toward the first ring, the chain is twisted out of the vibrations and shocks generated in the chain. The vibration generated in the direction (the direction in which the axis of the damping ring swings around the center of the damping ring) can be absorbed by the elastic body with the vertex of the projecting portion as the fulcrum. Therefore, even if the chain moves in the twisting direction, abnormal noise can be effectively suppressed by damping due to deformation of the elastic body while allowing the movement. 1 to 3 show a chain slipper according to an embodiment of the present invention and a damping ring inserted into the chain slipper. FIG. 4 shows a chain slipper according to an embodiment of the present invention. 2 shows a structure to be arranged. The chain slipper 10 according to the embodiment of the present invention is disposed on the loose side of the chain 20, as shown in FIG. A chain guide 30 is arranged on the tension side of the chain 20. The chain 20 is wound around the crank sprocket 40 and the cam sprocket 50, and transmits the rotation of the crankshaft of the engine to the camshaft. [0007] The chain slipper 10 extends along the chain line. The chain slipper 10 is convexly curved toward the chain 20. The chain slipper 10 has a lower end (an end on the crank sprocket 40 side).
Thus, it is swingably attached to an internal combustion engine (not shown) (for example, a cylinder block) in a direction approaching or moving away from the chain 20. The chain slipper 10 is pressed against the chain 20 by the chain tensioner 60, and constantly tensions the chain 20 together with the chain tensioner 60 so that the chain 20 is not loosened. As shown in FIG. 1, a hole 10a extending in the direction of the pivot axis of the chain slipper 10 is provided at the pivot of the chain slipper 10, and a damping ring 70 is inserted into the hole 10a. . The damping ring 70 has an insertion hole 70a into which a pin or a bolt for supporting the chain slipper 10 on an internal combustion engine (not shown) is inserted. The axis of the damping ring 70 coincides with the swing axis of the chain slipper 10. The damping ring 70 includes a first ring 71,
It comprises a second ring 72 having a diameter different from that of the first ring 71, and an elastic body 73 disposed between the first ring 71 and the second ring 72. Although the diameter of the second ring 72 is smaller than the diameter of the first ring 71 in the illustrated example of the present invention, the diameter of the second ring 72 is smaller than that of the first ring 71.
May be larger than the diameter. The first ring 71 is made of resin or metal. As shown in FIG. 3, the shape of the first ring 71 is a cylindrical shape having a constant thickness or a substantially constant thickness. [0010] The second ring 72 is made of resin or metal. The surface of the second ring 72 facing the first ring 71 (hereinafter, referred to as the first ring facing surface) 72a has a central portion in the ring axis direction that is the second ring 7 of the first ring 71.
2 (hereinafter referred to as a second ring-facing surface) 7
1a (hereinafter, the projecting portion is referred to as a projecting portion 72b). The protrusion 72b is provided continuously in the circumferential direction of the second ring 72. Projection 7
2b has a cross-section abacus ball shape, and its tip in the protruding direction has an R-shaped cross section (curved surface). An elastic body 73 may or may not be arranged between the projecting end of the protruding portion 72b and the second ring facing surface 71a of the first ring 71. .
The tip of the projecting portion 72b in the projecting direction and the second
When the elastic body 73 is not disposed between the first ring 71 and the second ring facing surface 71a of the first ring 71, the elastic body 73 is not arranged between the first ring 71 and the second ring facing surface 71a.
Of the first ring facing surface 72a of the second ring 72,
The portion where the protrusion 72b is provided and the portion where the protrusion 72b is not provided are smoothly connected. The elastic body 73 is made of rubber. Elastic body 73
Is disposed between the first ring 71 and the second ring 72. The thickness of the portion of the elastic body 73 where the protrusion 72b is not provided is smaller than the thickness of the portion where the protrusion 72b is not provided. The elastic body 73 includes the first ring 71
Of the second ring facing surface 71a and the first ring 72
And the ring facing surface 72a. Of the elastic body 72,
The fixing between the second ring facing surface 71a of the first ring 71 and the first ring facing surface 72a of the second ring 72 is, for example, vulcanization bonding. However, vulcanization bonding may be replaced by other bonding or welding other than bonding or mechanical fixing. Next, the operation of the embodiment of the present invention will be described.
Since the damping ring 70 is inserted into the swing fulcrum of the chain slipper 10 and the damping ring 70 has the elastic body 73, the elastic body 73 can absorb vibration transmitted from the chain slipper 10 to a cylinder block (not shown). Therefore, generation of sound can be suppressed as compared with the case where the elastic body 73 is not provided (conventional direct support type). Further, since the projecting portion 72b is provided, a force is applied in a direction in which the elastic body 73 is compressed (in a direction orthogonal to the axial direction of the damping ring 70) by vibration and impact generated in the chain 20. At this time, the elastic body 73 is
It is compressed only until 2b hits the second ring facing surface 71a of the first ring 71. Therefore, the elastic body 73 can be prevented from being quickly deteriorated (set) as compared with the conventional floating support type. In addition, since the protruding portion 72b is provided, of the vibration and impact generated in the chain 20, the direction in which the chain 20 is twisted (the axis of the damping ring 70 is swung about the center of the damping ring 70). The vibration generated in the direction (direction) can be absorbed by the elastic body 73 with the vertex of the protrusion 72b as a fulcrum. Therefore, even if the chain 20 moves in the twisting direction, the noise can be effectively suppressed by damping due to the deformation of the elastic body 73 while allowing the movement. Further, since the tip of the projecting portion 72b in the projecting direction has an R-shaped cross section, the projecting portion 72b is
And the protrusion 72b can be prevented from damaging the first ring 71. According to the chain slipper of the present invention, since the damping ring is inserted into the swing fulcrum, and the damping ring has an elastic body, the chain block is separated from the chain slipper by the elastic body. Can absorb vibrations transmitted to Therefore, generation of sound can be suppressed as compared with the case where no elastic body is provided (conventional direct support type). Also, since the center of the second ring in the ring axial direction on the surface facing the first ring protrudes toward the first ring,
When a force is applied in a direction in which the elastic body compresses, the elastic body is compressed only until the projecting portion hits the first ring. Therefore, the elastic body can be prevented from being deteriorated earlier (set) as compared with the conventional floating support type. Further, since the center of the second ring in the ring axial direction on the surface facing the first ring protrudes toward the first ring, the chain is twisted out of the vibrations and shocks generated in the chain. The vibration generated in the direction (the direction in which the axis of the damping ring swings around the center of the damping ring) can be absorbed by the elastic body with the vertex of the projecting portion as the fulcrum. for that reason,
Even if the chain moves in the twisting direction, the noise can be effectively suppressed by damping due to deformation of the elastic body while allowing the movement.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing a swing fulcrum of a chain slipper according to an embodiment of the present invention and its vicinity. FIG. 2 is a cross-sectional view of a portion of the damping ring inserted into the chain slipper according to the embodiment of the present invention, where a protrusion is not provided. FIG. 3 is a cross-sectional view of a damping ring inserted into the chain slipper according to the embodiment of the present invention. FIG. 4 is a configuration diagram showing a general structure to which the chain slipper of the embodiment of the present invention is applied. FIG. 5 shows a conventional direct support type chain slipper.
It is sectional drawing which shows a swing fulcrum and its vicinity. FIG. 6 shows a conventional floating support type chain slipper.
It is sectional drawing which shows a swing fulcrum and its vicinity. FIG. 7 is a sectional view of a bush having an elastic body inserted into a conventional floating support type chain slipper. FIG. 8 is a sectional view of a bush having an elastic body inserted into a conventional floating support type chain slipper. [Description of Signs] 10 Chain slipper 10a Hole 20 Chain 30 Chain guide 40 Crank sprocket 50 Cam sprocket 60 Chain tensioner 70 Damping ring 70a Insertion hole 71 into which pin or bolt is inserted 71 First ring 71a Second ring of first ring Ring facing surface 72 Second ring 72a First ring facing surface 72b of second ring Projection 73 Elastic body

Claims (1)

Claims 1. A chain slipper which is arranged on a loose side of a chain and is swingably attached to an internal combustion engine, wherein the chain slipper is provided at a swing support point of the chain slipper. A damping ring having an insertion hole into which a pin or bolt for supporting the damping ring is inserted, wherein the damping ring includes a first ring, a second ring,
An elastic body disposed between the first ring and the second ring, and a central portion in a ring axial direction of a surface of the second ring facing the first ring is the first ring. A chain slipper protruding toward the ring.