JP2003214504A - Movable lever for transmission chain - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a movable lever for a transmission chain, which reduces friction between an inner wall of a co-fastening mounting hole of reinforcing plates and a journaling means, restraining occurrence of unpleasant metal noises and friction of the reinforcing plates, and preventing the reinforcing plates and the supporting means from being seized. <P>SOLUTION: This movable lever for a transmission chain, where a lever body 10 having a vertical plate section 12 provided in the lever longitudinal direction on the back side of a shoe section is integrally formed by synthetic resin, and where a reinforcing plate 20 is inserted and fitted into a slit 12a opened at a vertical end part of the vertical plate section and formed in the lever longitudinal direction, is installed on an inner wall of a building frame so as to be oscillatable by the journaling means inserted through co-fastening mounting holes 12b, 21, drilled in the lever body and the reinforcing plate respectively. In the lever body, a first oil supplying hole 12h is drilled which communicates with the section from a sliding-contact surface of the shoe section to the co-fastening mounting hole the reinforcing plates, and in the sliding surface of the shoe section, an oil guiding groove 12i is formed which guides lubricating oil on the sliding-contact surface to the first oil supplying hole 12. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission chain used in a transmission device for transmitting power from a driving side to a driven side by a driving side sprocket, a driven side sprocket, and a transmission chain wound around these sprockets to circulate. The present invention relates to a movable lever.

[0002]

2. Description of the Related Art Generally, an engine, a drive unit and the like are shown in FIG.
As shown in FIG. 1, a transmission device for transmitting power from the driving side to the driven side by the chain CH is provided. This transmission has a chain C that runs in circulation in cooperation with the tensioner T.
A movable lever Ga having a sliding function is used in order to apply appropriate tension by slidingly contacting H and to prevent vibration and lateral vibration of the chain CH during traveling. The movable lever Ga is swingably attached to an inner wall of a frame E such as an engine and a drive device by means of a shaft support means P such as a mounting bolt and a mounting pin.

FIG. 10 shows a perspective view of a movable lever for a transmission chain (a so-called tensioner lever) used in a transmission device using a chain previously filed by the applicant of the present application (see Japanese Patent No. 3253951).

This movable lever for a transmission chain is provided with a shoe portion 31 on which a traveling chain contacts and slides on the surface, and a vertical plate portion 32 provided on the back side of the shoe portion 31 in the lever longitudinal direction. The lever body 30 is integrally molded with synthetic resin, and a reinforcing plate 40 made of a rigid material that reinforces the lever body 30 is formed at the vertical end of the vertical plate-shaped portion 32 so as to extend in the lever longitudinal direction. It is fitted in the slit 32a. A mounting hole 32b for co-fastening is provided on the fixed end portion side of the vertical plate-shaped portion 32 for mounting to the body of an engine, a drive device, etc., and the one end portion side of the reinforcing plate 40 has the above-mentioned structure. Slit 3
Mounting hole 3 for joint tightening of lever body 30 fitted in 2a
It is positioned together with 2b, and a mounting hole 41 for joint tightening is provided by a shaft support means such as a mounting bolt and a mounting pin.

In the above-described movable lever for a transmission chain, a lever main body 32 composed of a shoe portion 31 and a vertical plate portion 32 provided vertically on the back side of the shoe portion 31 is integrally molded of synthetic resin or the like. Since the main body 32 itself has a sliding function, it is not necessary to separately provide a shoe member, and as a result, it is possible to suppress an increase in the number of parts and the number of manufacturing processes. Moreover, the vertical plate-shaped portion 32 of the lever main body 30 is formed with a slit 32a opening at its vertical end in the longitudinal direction of the lever, and the reinforcing plate 40 is fitted into the slit 32a. The reinforcing plate 40 can be arranged so that the strength (section modulus) in the rocking direction of the is increased, and it is also possible to dramatically improve bending rigidity, toughness, and strength. The so-called slide type lever having such a structure meets the needs of the times of low cost and high reliability, and its use is rapidly expanding.

[0006]

However, in the above-mentioned slide type movable lever for a transmission chain, the inner wall of the co-tightening mounting hole of the reinforcing plate and the shaft supporting means such as the mounting bolt rub at the shaft supporting portion. Therefore, an unpleasant metal sound may be generated, the inner wall of the mounting hole for co-fastening of the reinforcing plate may be worn, and the shaft may be loosened, or the reinforcing plate and the shaft supporting means may be seized due to frictional heat. New issues have been pointed out, and further improvements are expected from these points as well.

Therefore, the present invention solves the above-mentioned problems of the conventional movable lever for a transmission chain, reduces the friction between the inner wall of the mounting hole for joint tightening of the reinforcing plate and the shaft supporting means, and is uncomfortable. An object of the present invention is to provide a movable lever for a transmission chain, which suppresses the generation of metallic noise and wear of the reinforcing plate and prevents the reinforcing plate and the shaft supporting means from being seized.

[0008]

In order to achieve the above object, a movable lever for a transmission chain according to the present invention comprises a shoe portion on which a traveling transmission chain contacts and slides on a surface, and a back side of the shoe portion. A lever main body having a vertical plate-shaped portion provided over the lever longitudinal direction is integrally molded of synthetic resin, and a reinforcing plate for reinforcing the lever main body is opened at a vertical end of the vertical plate-shaped portion. A shaft supporting means is inserted into a slit formed in the lever longitudinal direction and is inserted into co-tightening mounting holes formed in each of the lever body and the reinforcing plate, so that it can swing on the inner wall of the body. A movable lever for a transmission chain to be mounted, wherein the lever body is provided with a first oil supply hole that communicates from a sliding contact surface of the shoe portion to the co-fastening mounting hole, and The contact surface, constituted by the lubricating oil on the sliding contact surface to form an oil guide groove to induce into the first oil supply hole.

Further, in addition to the structure of the movable lever for a transmission chain according to the present invention, the movable lever for a transmission chain according to the present invention has a plunger of a tensioner on the swing end side of the lever body. A plunger receiving portion that abuts is provided, and a second oil supply hole that communicates from the plunger receiving portion to the sliding contact surface of the shoe portion is bored.

The diameters of the first oil supply hole and the second oil supply hole are, respectively, between the sliding contact surface of the shoe portion and the inner wall of the mounting hole for co-tightening, or the plunger receiving portion and the shoe portion. The size is not particularly limited as long as it is large enough to communicate with the sliding contact surface and to reliably guide the oil.

In the present invention, the material forming the lever main body is not particularly limited, but since the contact sliding surface with the transmission chain also has a function as a shoe, wear resistance, So-called engineering plastics such as polyamide resins having excellent lubricity are preferable. Specific examples thereof include nylon 6, nylon 66, wholly aromatic nylon and the like. Fiber reinforced plastics may be used alone or in combination according to required toughness and strength.

The material of the reinforcing plate is not particularly limited as long as it has bending rigidity and strength required for the movable lever for the transmission chain, but is not limited to cast iron, iron-based metal such as stainless steel, aluminum, magnesium. Preferred are non-ferrous metals containing titanium as a main component, engineering plastics such as polyamide resins, and fiber reinforced plastics.

[0013]

The movable lever for a transmission chain according to the present invention has the above-described structure, and thus exhibits the following unique operation of the present invention.

First, according to the movable lever for a transmission chain according to the first aspect of the present invention, the lever body is provided with a first oil supply hole which communicates from the sliding contact surface of the shoe portion to the co-fastening mounting hole. By forming an oil guide groove on the sliding contact surface of the shoe portion to guide the lubricating oil on the sliding contact surface to the first oil supply hole, the chain that circulates on the sliding contact surface of the shoe portion The carried lubricating oil is guided along the oil guide groove to the first oil supply hole, and keeps the inner wall of the co-fastening mounting hole constantly wet with the lubricating oil.

According to the movable lever for a transmission chain according to the present invention, in addition to the function of the movable lever for a transmission chain according to the present invention, the movable lever for a transmission chain is provided on the swing end side of the lever body. Since the second oil supply hole that communicates with the sliding contact surface of the shoe portion from the plunger receiving portion is provided, the oil discharged from the relief valve at the tip of the plunger of the tensioner passes through the second oil supply hole. Is supplied to the sliding surface of the shoe portion to increase the amount of oil guided to the first oil supply hole.

[0016]

1 is a block diagram showing the structure of a movable lever for a transmission chain according to the present invention.
~ It demonstrates with reference to FIG. 1 is a side view of a movable lever for a transmission chain according to an embodiment of the present invention, and FIG. 2 is a plan view of the movable lever for a transmission chain shown in FIG. 3 is a plan view of the movable lever for a transmission chain shown in FIG. 1, viewed from above. Figure 4
FIG. 4 is a cross-sectional view of the reinforcing plate 20 taken along the line AA.

First, as shown in FIG. 1, a transmission chain movable lever according to an embodiment of the present invention comprises a lever body 10 integrally formed of synthetic resin and a reinforcing plate 20 stamped from a steel plate. A two-piece structure configured is provided, and the reinforcing plate 20 is fitted and reinforced in the lever body 10 in the arrow direction.

The lever body 10 has a shoe portion 1 having a sliding surface on which a traveling transmission chain comes in contact and slides.
1 and a vertical plate-shaped portion 12 vertically provided on the back side of the shoe portion 11 along the lever longitudinal direction. The vertical plate-shaped portion 12 is provided on the vertical end side along the lever longitudinal direction. An opening slit 12a, a boss portion 12c having a co-fastening attachment hole 12b for attaching to an inner wall of a body such as an engine, and a plunger receiving portion 12d for contacting a plunger of a tensioner (not shown) are provided. . In addition, the vertical plate-shaped portion 1 of the lever body 10
A plurality of reinforcing ribs 12e that reinforce the lever structure are formed on the outer surface side of 2.

The lever main body 10 is provided with a first oil supply hole 12h which communicates from the sliding contact surface of the shoe portion 11 to the inner wall of the co-fastening mounting hole 12b. An oil guide groove 12i for guiding the lubricating oil on the sliding contact surface to the first oil supply hole 12h is formed on the contact surface. The first oil supply hole 12h is formed so as to straddle a slit having a diameter longer than the width of the slit 12a of the lever body. As a result, the lubricating oil carried by the chain that circulates on the sliding contact surface of the shoe portion first flows into the oil guide groove 12i. Then, through the space formed by both side surfaces of the reinforcing plate 20 and the first oil supply hole 12h, the inner wall of the co-fastening mounting hole 12b is reached, and the inner wall is constantly wetted with lubricating oil. Keep in the state.

Further, as shown in FIG. 4, the edge of the co-fastening mounting hole 21 of the reinforcing plate 20 is cut so that the co-fastening mounting hole 12b passes through the first oil supply hole 12h.
It becomes possible to spread the lubricating oil that has reached the inner wall of the above-mentioned all over the inner peripheral surface of the mounting hole for co-fastening. Further, the reinforcing plate 21
When the lever is fitted into the lever main body 10, the side surface of the reinforcing plate facing the first oil supply hole 12h is slightly separated so that the lubricating oil can be attached to the inner wall of the co-fastening mounting hole 12b. The effective cross-sectional area of the first oil supply hole 12h for guiding can be increased, and the amount of lubricating oil introduced to the inner wall of the co-fastening mounting hole can be increased.

Next, a second embodiment which is another embodiment of the present invention will be described with reference to FIGS. FIG. 5 is a side view of the transmission chain movable lever 10 according to the second embodiment, FIG. 6 is a plan view of the transmission chain movable lever shown in FIG. 5 as viewed from below, and FIG. FIG. 6 is a plan view of the movable lever for a transmission chain shown in FIG. 8 and 9
[Fig. 6] is a view for explaining the action of the movable lever 10 for a transmission chain of the second embodiment.

In the second embodiment, a plunger receiving portion 12d with which the plunger of the tensioner abuts is provided on the swing end side of the lever body 10, and the plunger receiving portion communicates with the sliding contact surface of the shoe portion. The structure is the same as that of the movable lever for the transmission chain described in the first embodiment except that the oil supply hole 12g is drilled.

In the movable lever for the power transmission chain of the second embodiment, as shown in FIG. 8, the oil released from the relief valve at the tip of the plunger of the tensioner slides on the shoe portion through the second oil supply hole 12g. Since the oil is supplied to the oil guide groove 12i on the moving surface, the amount of oil guided to the first oil supply hole 12h increases. Therefore, refueling the shaft support, etc.
The lubricity of the shaft support can be maintained for a long period of time without any special maintenance. It should be noted that by piercing the hole of the relief valve of the plunger to a position that coincides with the second oil supply hole 12g when the plunger contacts the plunger receiving portion, the oil discharged from the relief valve is formed. Can be taken into the second oil supply hole 12g without waste.

In the example described above, the first oil supply hole 1
2h is formed substantially perpendicular to the shoe surface 11,
As shown in FIG. 9, the first oil supply hole 12h is formed so as to be inclined in the longitudinal direction of the lever main body 12, so that the flow of oil toward the inner wall of the co-fastening mounting hole 12b is further smoothed. You can

[0025]

The movable lever for the power transmission chain of the present invention is
By providing the above-mentioned structure, the following effects peculiar to the present invention are achieved.

First, according to the movable lever for the transmission chain of the first aspect, the lever body is provided with the first oil supply hole which communicates from the sliding contact surface of the shoe portion to the co-fastening mounting hole. By forming an oil guide groove on the sliding contact surface of the shoe portion for guiding the lubricating oil on the sliding contact surface to the first oil supply hole, a chain that circulates on the sliding contact surface of the shoe portion is used. The exposed lubricating oil can be efficiently guided to the first oil supply hole, and the inner wall of the co-fastening mounting hole is constantly kept wet with the lubricating oil without requiring special maintenance work. It will be possible. As a result, in combination with the wear resistance of the reinforcing plate itself, the durability, rotation characteristics, and quietness of the shaft support portion are dramatically improved, and the problem of seizure between the reinforcing plate and the shaft support means is solved. It

According to the movable lever for the transmission chain of the second aspect, in addition to the effect of the movable lever for the transmission chain of the first aspect, the movable lever for the transmission chain is provided on the swing end side of the lever body. Since the second oil supply hole that communicates with the sliding contact surface of the shoe portion from the plunger receiving portion is provided, the oil discharged from the relief valve at the tip of the plunger of the tensioner passes through the second oil supply hole. The amount of oil supplied to the sliding surface of the shoe portion and guided to the first oil supply hole is increased, and the durability, rotation characteristics, and quietness of the shaft support portion are further improved.

[Brief description of drawings]

FIG. 1 is a side view showing an assembled state of a movable lever for a transmission chain that is an embodiment of the present invention.

FIG. 2 is a plan view of the movable lever for the transmission chain shown in FIG. 1, viewed from the bottom side.

FIG. 3 is a plan view of the movable lever for the transmission chain shown in FIG. 1, seen from the upper surface side.

4 is a cross-sectional view of the reinforcing plate 20 of the movable lever for the transmission chain shown in FIG. 1, taken along the line AA.

FIG. 5 is a side view showing an assembled state of a movable lever for a transmission chain that is another embodiment of the present invention.

6 is a plan view of the movable lever for the transmission chain shown in FIG. 5, viewed from the bottom side.

FIG. 7 is a plan view of the movable lever for the transmission chain shown in FIG. 5, viewed from the upper surface side.

FIG. 8 is a diagram illustrating an operating state of the movable lever for the transmission chain shown in FIG.

FIG. 9 is a diagram for explaining an operating state of a movable lever for a transmission chain that is another embodiment of the present invention.

FIG. 10 is an assembly view of a conventional movable lever for a transmission chain.

FIG. 11 is a mounting layout diagram of a movable lever for a transmission chain in an engine room.

[Explanation of symbols]

10 ... Lever body 11 ・ ・ ・ Shoe part 12 ... Vertical plate-shaped part 12a ... slit 12b ... Mounting hole for joint tightening 12c ... Boss part 12d ... Plunger receiving part 12e ... Reinforcing rib 12g ... 1st oil supply hole 12h: second oil supply hole 12i ... Oil guide groove 20 ... Reinforcing plate 21 ・ ・ ・ Mounting hole for joint tightening CH ・ ・ ・ Transmission chain Ga ・ ・ ・ Movable lever E ・ ・ ・ The inner wall of the body P ・ ・ ・ Shaft support means (mounting bolt) T: Tensioner O ・ ・ ・ Engine oil S1 ・ ・ ・ Drive side sprocket S2 ・ ・ ・ Sprocket on the driven side

Claims (2)

[Claims] 1. A lever main body comprising a synthetic resin and a shoe body on which a traveling transmission chain contacts and slides on a surface, and a vertical plate-like portion provided on the back side of the shoe portion along the longitudinal direction of the lever. A reinforcing plate that is molded and that reinforces the lever main body is inserted into a slit formed in the vertical end of the vertical plate-shaped portion and formed along the lever longitudinal direction, and is formed in each of the lever main body and the reinforcing plate. A movable lever for a transmission chain, which is swingably attached to an inner wall of a skeleton by means of a shaft support inserted through a mounting hole for co-tightening, wherein the lever body is provided with the co-tightening from the sliding contact surface of the shoe portion. A first oil supply hole communicating with the mounting hole is formed, and an oil guide groove for guiding the lubricating oil on the slide contact surface to the first oil supply hole is formed on the sliding contact surface of the shoe portion. Specially Movable lever for a transmission chain to be. 2. A second oil supply which has a plunger receiving portion on the swinging end side of the lever main body, with which a plunger of a tensioner abuts, and communicates with the sliding contact surface of the shoe portion from the plunger receiving portion. The movable lever for a transmission chain according to claim 1, wherein the hole is perforated.