JP2004116680A - Pad for tensioner lever - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lightweight and inexpensive tensioner lever with little abutting noise, and superior mechanical strength and wear resistance in a plunger abutting portion, which can be easily integrally formed by sandwich molding. <P>SOLUTION: The pad for the tensioner lever is provided with a lever attaching portion 11 attached to a tensioner opposite side of the tensioner lever L, and the plunger abutting portion 12 integrally and inseparably provided on the lever attaching portion 11. The lever attaching portion 11 comprising a first high polymer resin material, and the plunger abutting portion 12 comprising a second high polymer resin material with higher strength than the first high polymer resin material are molded by injection by a sandwich molding method, and they are integrated in a mutually adhered and joined state. A whole of an outer surface 13 of the plunger abutting portion 12 is covered by the first high polymer resin material partially continuous from the lever attaching portion 11. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
INDUSTRIAL APPLICABILITY The present invention is used for a power transmission device such as an automobile engine that transmits power by a transmission chain such as a roller chain or a silent chain that circulates around a driving sprocket and a driven sprocket and circulates. The present invention relates to a pad which is mounted on a tensioner lever which is tensioned while running such a transmission chain in a sliding contact state, and which is brought into contact with a plunger of a tension applying device called a tensioner.
[0002]
[Prior art]
Generally, in a transmission device such as an engine for an automobile, a tensioner lever for slidingly driving a transmission chain is attached to a frame such as an engine block wall with mounting bolts, pins, or the like in a state of being arranged close to the tensioner. The lever applies an appropriate transmission tension to the transmission chain while cooperating with the tensioner to prevent a transmission failure due to the transmission chain being too tight or too loose.
[0003]
The conventional tensioner lever includes a resin shoe for slidingly driving the transmission chain and an aluminum arm for holding the resin shoe, and a tensioner plunger is provided on the side of the aluminum arm that is in contact with the tensioner. A resin pad is provided (for example, see Patent Document 1).
[0004]
[Patent Document 1]
Japanese Utility Model Registration No. 2540896 (pages 1-3, FIG. 1)
[0005]
[Problems to be solved by the invention]
However, the resin pad used for the conventional tensioner lever is made of a single material, and is interposed between the tensioner lever and the plunger of the tensioner, resulting in the transmission chain being too tight or too loose. Since the load of the transmission tension is fluctuated for a long period of time, there is a problem that deformation and wear are apt to occur, and it is difficult to satisfy from the viewpoint of mechanical strength.
[0006]
In order to solve this problem, a pad made of glass fiber reinforced polyamide 66 resin can be considered. However, if the pad surface wears due to frequent mutual contact and sliding between the tensioner and the plunger, the glass fiber is exposed and crushed. There is a problem that the crushed glass fiber acts as an abrasive and may significantly wear and damage the tensioner plunger. There is a problem that there is a concern of generating noise.
[0007]
In addition, a pad made of a metal material can be considered to withstand frequent mutual contact with the plunger of the tensioner and a high load due to mutual sliding, but a problem that a metallic sound is generated when the plunger of the tensioner contacts the plunger. In addition to the above, there is a problem that metal processing such as cutting for assembling the lever body is required, which causes an increase in manufacturing cost.
[0008]
Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art, which can be easily formed integrally by sandwich molding, and has excellent mechanical strength and abrasion resistance at a plunger contact portion. An object of the present invention is to provide a lightweight and inexpensive tensioner lever pad that has low contact noise.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a pad for a tensioner lever according to the first aspect of the present invention includes a lever assembly portion attached to a tensioner opposing side of a tensioner and a plunger contact provided inseparably on the lever assembly portion. A tensioner lever pad having a contact portion, wherein the lever assembly portion made of a first polymer resin material and the plunger contact made of a second polymer resin material having a higher strength than the first polymer resin material; The first and second parts are integrally formed in a state where they are injection-molded by a sandwich molding method and are tightly joined to each other, and the outer surface of the plunger contacting part is made of a first polymer resin material partially continuous from the lever assembly part. The problem is solved by being entirely covered.
[0010]
According to a second aspect of the present invention, in addition to the configuration of the first aspect of the present invention, the tensioner lever pad has a plunger abutting portion provided with a plunger lateral displacement regulating side wall along a traveling direction of the transmission chain. This problem is further solved by providing a curved surface having a circular arc shape on the side surface that always comes into contact with the axis of the plunger that moves forward and backward with respect to the transmission chain.
[0011]
According to a third aspect of the present invention, in the tensioner lever pad according to the first aspect of the present invention, the first polymer resin material is a polyamide 66 resin or a polyamide 46 resin. The second object is further solved by the fact that the second polymer resin material is a glass fiber reinforced polyamide 66 resin.
[0012]
Here, the sandwich molding method referred to in the present invention means that two types of polymer resins are simultaneously or almost simultaneously injected into a mold simulating the outer shape of a molded product. This is a method for producing a molded product made of a resin material, that is, a so-called two-layer skin core molded product, and a known injection molding machine for sandwich molding can be used.
In addition, the known sandwich molding injection molding machine is provided with various sandwich nozzles, but in the case of a sandwich molding injection molding machine equipped with a parallel sandwich nozzle, the inside of the parallel sandwich nozzle is By moving the torpedo (that is, the injection switching member between the polymer resin material for the skin layer and the polymer resin material for the core layer) back and forth, the filling state of the two types of polymer resin materials, that is, the injection amount and The ratio of the injection speed can be finely controlled according to the shape of the molded product. For example, in controlling the thickness of the skin layer in the present invention, if it is desired to mold with emphasis on high strength characteristics, the skin layer is thinned and the volume of the core layer is increased to further improve the high strength. It is possible to do.
[0013]
Further, the basic materials of the first polymer resin material and the second polymer resin material as described above are not particularly limited, but they have a chemical affinity and a large difference in shrinkage characteristics. Those which are not present are preferred in that they are fused well at the boundary region between them at the time of sandwich molding and are well bonded. Specific examples thereof include polyamide resins selected from commercially available polyamide 6, resin, polyamide 66 resin, polyamide 46 resin, wholly aromatic polyamide resin, glass fiber reinforced polyamide 66 resin, and the like.
[0014]
[Action]
According to the tensioner lever pad of the present invention, the lever assembly portion made of the first polymer resin material and the second polymer resin material having higher strength than the first polymer resin material are used. Since the plunger abutting portion and the plunger contact portion are injection-molded by a sandwich molding method and are integrated with each other in a state of being in close contact with each other, these portions are integrally joined in a completely melted state. The material exhibits excellent durability which could not be achieved by the material or the mechanical connection of separate members.
[0015]
Further, since the outer surface of the plunger contact portion is entirely covered with the first polymer resin material partially continuous from the lever assembly portion, the first polymer resin material is in a skin state of the entire coating. Since the entire pad is reinforced, the durability is further improved.
[0016]
According to the pad for a tensioner lever of the second aspect of the present invention, in addition to the function of the first aspect of the present invention, the plunger contact portion is provided with a side wall for regulating the lateral displacement of the plunger along the traveling direction of the transmission chain. With this arrangement, even if the pad abutment position on the plunger slightly shifts due to the influence of meandering that tends to occur when the transmission chain runs at high speed, the side wall for regulating the lateral displacement of the plunger comes into contact with the plunger that advances and retreats in the protruding direction. Stable reception without removing the contact state.
[0017]
Since the plunger abutment portion has a curved surface having an arcuate side surface such that the plunger abuts on the axis of the plunger which advances and retreats with respect to the transmission chain, the tensioner lever rotates in response to a change in tension of the transmission chain. Therefore, even if the contact angle of the plunger with respect to the longitudinal direction of the lever changes, the plunger contact portion always stably receives the plunger while constantly contacting the axis of the plunger.
[0018]
According to the tensioner lever pad of the third aspect of the present invention, in addition to the function of the first or second aspect, the first polymer resin material is a polyamide 66 resin or a polyamide 46 resin. Further, since the second polymer resin material is a glass fiber reinforced polyamide 66 resin, the boundary region between the first polymer resin material and the second polymer resin material can be completely formed by utilizing the affinity between the first polymer resin material and the second polymer resin material. It becomes a fusion state that is integrated with the, and exhibits more excellent durability.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
An example which is a preferred embodiment of the present invention will be described with reference to the drawings.
FIGS. 1 to 3 relate to a tensioner lever pad 10 according to an embodiment of the present invention. FIG. 1 is a view for explaining a use mode of the embodiment, and FIG. FIG. 3 is an enlarged sectional view taken along line AA of FIG. 2.
[0020]
First, as shown in FIG. 1, a tensioner lever pad 10 according to the present embodiment is provided inside an automobile engine that transmits power by a transmission chain C that circulates around a driving sprocket S1 and a driven sprocket S2 and circulates. It is assembled to the tensioner lever that is arranged.
[0021]
As shown in FIGS. 2 and 3, the tensioner lever pad 10 of the present embodiment is provided integrally with the lever assembly portion 11 attached to the tensioner lever L on the side opposite to the tensioner and the lever assembly portion 11. And a plunger contact portion 12.
The lever assembly portion 11 is made of a first polymer resin material made of a polyamide 66 resin, and the plunger contact portion 12 is made of a glass fiber reinforced polyamide 66 resin having higher strength than the first polymer resin material. The lever assembly portion 11 and the plunger contact portion 12 are made of a second polymer resin material, and are integrally formed in a state where they are injection-molded by a sandwich molding method and are in close contact with each other. The outer surface 13 of the contact portion 12 is entirely covered with a first polymer resin material made of polyamide 66 resin that is partially continuous from the lever assembly portion 11.
[0022]
Although the polyamide 66 resin is used as the first polymer resin material in this embodiment, any other polyamide 46 resin or aromatic resin may be used as long as the polymer resin material can exhibit high strength characteristics. A group polyamide resin may be used.
On the other hand, as the second polymer resin material, a glass fiber reinforced polyamide 66 resin is employed. However, if the polymer resin material can exhibit high strength characteristics, other glass fiber reinforced polyamide 46 resin, or Alternatively, a glass fiber reinforced aromatic polyamide resin may be used.
[0023]
Therefore, such a pad structure of the present embodiment is achieved by the following sandwich molding.
First, a lever assembly is formed by injecting a first polymer resin material made of polyamide 66 resin from a sandwich nozzle of an injection molding machine for sandwich molding into a single simple mold that simulates the outer shape of a pad molded product. The molding of the skin layer made of abrasion-resistant polyamide 66 resin is started over the entire outer shape of the pad molded product composed of the attaching portion 11 and the plunger contact portion 12.
At the same time or almost at the same time as the start of injection of the skin layer, a second polymer resin material made of glass fiber reinforced polyamide 66 resin is injected, and the plunger abutting portion 12 is formed as a core layer with a high-strength second resin material. 2 It is formed of a polymer resin material. Then, after cooling the mold, the pad molded product is taken out of the mold, and a series of molding cycle times is completed.
[0024]
Accordingly, the tensioner lever pad 10 of the present embodiment thus obtained is provided with the lever assembly portion 11 made of the first polymer resin material and the second polymer resin having higher strength than the first polymer resin material. Since the plunger abutting portion 12 made of a material is injection-molded by a sandwich molding method and integrated with each other in a state of being in close contact with each other, these portions are integrally joined in a completely melted state. Since the outer surface 13 of the contact portion 12 is entirely covered with the first polymer resin material partially continuous from the lever assembly portion 11, the entire pad is covered with the first polymer resin material in a completely covered skin state. In order to reinforce, it exhibits excellent durability which could not be achieved by a conventional single material or a mechanical connection of separate members.
[0025]
Further, on the outer surface of the plunger abutting portion 12, as shown in FIGS. 2 and 3, a plunger lateral displacement regulating side wall 14 made of polyamide 66 resin is provided along the traveling direction of the transmission chain. Even if the contact position is slightly displaced due to the influence of meandering that tends to occur when traveling at high speed, the plunger lateral displacement regulating side wall 14 stably does not come off the contact state with the plunger Tp which moves forward and backward in the projecting direction. As a result, a stable running state of the transmission chain in the forward and backward directions of the plunger Tp can be ensured.
[0026]
Further, as shown in FIG. 2, the plunger contact portion is provided with a curved surface 15 protruding in an arcuate side surface so as to always contact the axis of the plunger Tp which advances and retreats with respect to the transmission chain. Even if the tensioner lever L rotates according to the fluctuation of the tension and the contact angle of the plunger Tp with respect to the longitudinal direction of the lever changes, the plunger contact portion 12 stably receives the shaft while always contacting the axis of the plunger Tp. Therefore, the effect is enormous, for example, a stable running state of the transmission chain can be ensured.
[0027]
【The invention's effect】
As described above, the tensioner lever pad of the present invention has the following effects by having a specific configuration.
First, according to the tensioner lever pad of the invention according to claim 1, the lever assembly portion made of the first polymer resin material and the second polymer resin material having a higher strength than the first polymer resin material. The plunger abutting portion is formed by injection molding by a sandwich molding method and integrated with each other in a state of being in close contact with each other, so that these portions are integrally joined in a completely molten state, and the plunger abutting portion is formed. Since the outer layer portion of the portion is entirely covered with the first polymer resin material partially continuous from the lever assembly portion, the first polymer resin material reinforces the entire pad in a skin state of the entire coating. In addition, it exhibits excellent durability that could not be attained with conventional materials or mechanical coupling of separate members.
[0028]
In addition, the use of sandwich molding in which two types of molten polymer resin materials are simultaneously or almost simultaneously injected and the two types of molten polymer resin materials are merged in a completely molten state and fused together is used. The first polymer resin material and the second polymer resin material can be selected according to the wear resistance and high strength characteristics according to the high temperature environment conditions such as the inside of an automobile engine, or can be used to absorb the impact of the tensioner with the plunger. It can be arbitrarily selected according to relative characteristics such as contact noise and vibration suppression.
[0029]
According to the tensioner lever pad of the second aspect of the invention, in addition to the effect of the first aspect of the invention, the plunger contact portion has a side wall for regulating the lateral displacement of the plunger along the traveling direction of the transmission chain. Even if the abutment position is slightly displaced due to the influence of meandering that tends to occur when the transmission chain runs at high speed, the abutment state with the plunger where the side wall for regulating the lateral displacement of the plunger advances and retreats in the protruding direction is provided. The transmission chain can be stably received without being detached, and the plunger contact portion is provided with a curved surface in a side arc shape that always comes into contact with the axis of the plunger which advances and retreats with respect to the transmission chain. Even if the tensioner lever rotates according to the fluctuation of the tension and the contact angle of the plunger with respect to the longitudinal direction of the lever changes, the contact portion of the plunger Always to the axis of Nja it can be received stably while abutting.
[0030]
According to the tensioner lever pad of the third aspect of the invention, in addition to the effects of the first or second aspect, the first polymer resin material is a polyamide 66 resin or a polyamide 46 resin. Further, since the second polymer resin material is a glass fiber reinforced polyamide 66 resin, the boundary region between the first polymer resin material and the second polymer resin material can be completely formed by utilizing the affinity between the first polymer resin material and the second polymer resin material. Into a fused state, and can exhibit even more excellent durability.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a use mode of the present invention.
FIG. 2 is a perspective view of a tensioner lever pad according to the present embodiment.
FIG. 3 is an enlarged sectional view taken along line AA of FIG. 2;
[Explanation of symbols]
10 Pad for tensioner lever 11 Lever assembly part 12 Plunger abutment part 13 Outer surface 14 Plunger lateral displacement regulating side wall 15 Curved surface C Transmission chain S1 Drive sprocket S2 Driven sprocket T Tensioner Tp Plunger L Tensioner lever

Claims (3)

In a tensioner lever pad, comprising: a lever assembly portion assembled to a tensioner opposing side of a tensioner lever; and a plunger abutting portion provided integrally with the lever assembly portion.
The lever assembly portion made of the first polymer resin material and the plunger abutting portion made of the second polymer resin material having a higher strength than the first polymer resin material are injection-molded by a sandwich molding method and mutually connected. In a state of being closely bonded to
A pad for a tensioner lever, wherein an outer surface of the plunger contact portion is entirely covered with a first polymer resin material partially continuous from the lever assembly portion. The plunger contact portion includes a side wall for regulating plunger lateral displacement along a traveling direction of the transmission chain and a curved surface having a side-side arc shape that is always in contact with the axis of the plunger that advances and retreats with respect to the transmission chain. The tensioner lever pad according to claim 1, wherein the pad is provided. The tensioner according to claim 1, wherein the first polymer resin material is a polyamide 66 resin or a polyamide 46 resin, and the second polymer resin material is a glass fiber reinforced polyamide 66 resin. Pad for lever.

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