JP2004190788A - Movable guide for transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a movable guide for a transmission having excellent fittability, allowing positioning and fixing of a guide body and a reinforcement plate to each other, and having excellent silentness. <P>SOLUTION: This movable guide for the transmission comprises a shoe portion 102 brought into slidable contact with the surface of a running chain, the synthetic resin guide body 101 formed of a vertical plate-like portion 103 installed on the rear surface of the shoe portion in the longitudinal direction and forming a slit 107 opening to the end part thereof in the longitudinal direction, and the reinforcement plate 120 fitted to the slit. A synthetic resin guide body and the swing base end side of the reinforcement plate are commonly tightened to each other to install the movable guide on an engine or the skeleton of a drive device. A locking recessed part or locking hole is formed at least one position of the reinforcement plate, and a swelling and advancing part fitted to the locking recessed part or the locking hole is formed in the synthetic resin guide body by the plastic deformation by ultrasonic heating. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a transmission device that transmits power from a driving side to a driven side by a driving sprocket, a driven sprocket, and a chain wound around the sprocket and circulating.
[0002]
[Prior art]
Generally, an engine, a drive device, and the like are provided with a transmission device that transmits power by a chain. A movable guide having a sliding function is used in order to apply appropriate tension to the chain to prevent vibration, lateral runout, and the like of the chain during traveling. This movable guide is attached to a frame of an engine, a drive device, or the like using mounting bolts, pins, and the like.
[0003]
FIG. 4 shows a movable guide (tensioner lever) 300 used in a chain-type transmission device that has been previously patented by the present applicant (for example, see Patent Document 1).
[0004]
[Patent Document 1]
Japanese Patent No. 3253951 [0005]
The movable guide 300 includes a guide body 301 having a shoe portion 302 on which a running chain contacts and slides on the surface, and a vertical plate-shaped portion 303 provided on the back side of the shoe portion 302 in the guide longitudinal direction. A slit formed integrally with a synthetic resin and made of a rigid material for reinforcing the guide body 301 is formed at the vertical end (flange 304) of the vertical plate portion 303 and formed in the longitudinal direction of the guide. 307. The boss portion 306 of the vertical plate portion 303 is provided with a mounting hole 305 to be attached to a frame of an engine, a driving device or the like, and is fitted into the slit 307 at one end of the reinforcing plate 320. A bolt insertion hole 325 that is positioned and fastened together with the mounting hole 305 of the guide body 301 is provided.
[0006]
In the movable guide 300 described above, since the guide body 301 composed of the shoe portion 302 and the vertical plate-shaped portion 303 provided vertically on the back side of the shoe portion 302 is integrally formed of synthetic resin, the guide body 301 has a sliding function. Therefore, 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 steps. Moreover, a slit 307 that opens to the flange 304 at the vertical end of the vertical plate portion 303 of the guide body 301 is formed in the longitudinal direction of the guide, and a reinforcing plate 320 made of a rigid material is fitted into the slit 307. Therefore, the reinforcing plate can be provided so that the strength (section modulus) of the movable guide in the swing direction is increased, and the bending rigidity, toughness, and strength can be significantly improved.
[0007]
[Problems to be solved by the invention]
The above-described movable guide for a transmission device is provided with a locking piece 308 at a position where the guide main body 301 and the reinforcing plate 320 are opposed to each other in order to prevent the reinforcing plate inserted into the slit of the guide main body from coming off or slipping from the slit. , 309 and locking holes 328, 329 are engaged with each other. However, it is difficult to accurately provide a locking piece and a locking hole in advance at a position opposite to the reinforcing plate and the guide body. It has been pointed out that the bolt insertion hole of the reinforcing plate does not overlap, and a bolt for co-fastening cannot be inserted, and that assembling requires time and effort. In addition, it is possible to solve the above problem by making the size of the locking hole larger than the locking piece to have “play”, but in this case, the rotation of the movable guide is required. As a result, the reinforcing plate moves or vibrates for the amount of “play”, causing noise.
[0008]
Therefore, the present invention solves the problems of the conventional movable guide for a transmission device as described above, is excellent in assemblability, can position and fix the guide body and the reinforcing plate in a simple process, and is also quiet. An object of the present invention is to provide an excellent movable guide for a transmission.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a shoe portion for slidingly contacting a running chain with a front surface, and a slit provided in the back surface of the shoe portion in the longitudinal direction and opening at an end portion, in the longitudinal direction. A synthetic resin guide body composed of a vertical plate-shaped portion formed over the reinforcing resin plate, and a reinforcing plate fitted into a slit of the synthetic resin guide body; and a swing base end of the synthetic resin guide body and the reinforcing plate. A movable guide for a transmission device attached to a frame of an engine, a drive device, or the like by tightening the sides thereof, forming a locking concave portion or a locking hole in at least one place of a reinforcing plate, and forming the guide portion on a synthetic resin guide body. Is formed by plastic deformation to form a swelling entry portion that fits into the locking recess or the locking hole, thereby enabling positioning and fixing of the guide body and the reinforcing plate.
[0010]
[Action]
The present invention is a movable guide for a transmission device, wherein a locking recess or a locking hole is formed in at least one place of a reinforcing plate, and the locking recess or the locking hole is formed on a synthetic resin guide body by plastic deformation. By forming the bulging ingress portion that fits with the guide body, the positioning between the guide body and the reinforcing plate can be easily performed, and there is no play between the locking concave portion or the locking hole and the bulging intrusion portion. Securely fixed.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows an assembled state of a movable guide 100 used in a chain transmission. The movable guide 100 is formed by incorporating a reinforcing plate 120 in a direction indicated by an arrow in a synthetic resin guide body 101. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, that is, a boss portion, and FIG. 3 is a cross-sectional view taken along the line BB of FIG. I have.
[0012]
The synthetic resin guide body 101 is integrally formed, and has a shoe portion 102 having a sliding surface on the surface on which a running chain contacts and slides, and is provided vertically on the back surface of the shoe portion 102 in the longitudinal direction. And a vertical plate-shaped portion 103 having a flange 104 formed at a vertical end thereof and a mounting hole at a longitudinal end thereof for mounting to a frame such as an engine or a driving device. A boss portion 106 having a boss 105 is formed. Further, the vertical plate-shaped portion 103 has a reinforcing rib 103 'and a slit 107 which opens to an end on the flange 104 side in the longitudinal direction.
[0013]
As can be seen from FIGS. 1 to 3, the slit 107 is formed at the time of integral molding with a vertical plate-shaped portion 103 provided perpendicularly to the shoe portion 102 in the chain running direction. In order to reinforce the guide body 101 made of synthetic resin, a reinforcing plate 120 having a bolt insertion hole 125 is fitted from the side opposite to the shoe portion 102. The movable guide for a transmission in which the reinforcing plate 120 is fitted is a bolt (shoulder bolt) 200 having a pivotal support 210 as shown in FIG. Thereby, it is attached by being pierced together. At this time, the reinforcing plate 120 is not detached by the bolt 200 on the boss side.
[0014]
Further, in the present invention, the locking recesses or locking holes 128 and 129 are provided in at least one position of the reinforcing plate 120. Then, the reinforcing plate 120 is inserted into the synthetic resin guide body 101, and the two are positioned through the mounting hole 105 and the bolt insertion hole 125 through a shaft having the same diameter as the bolt and having a conical tip. As shown in FIG. 1, the horn 250 of the ultrasonic welding machine is applied to the vertical plate-shaped portion 103 of the synthetic resin guide body 101 facing the locking holes 128 and 129 formed in the guide 120. The synthetic resin of the main body 101 is melt-softened. The melt-softened synthetic resin falls into locking holes 128 and 129 formed in the reinforcing plate. Thereafter, by separating the horn 250 of the ultrasonic welding machine from the guide main body, the melt-softened synthetic resin is hardened in a state of being inserted into the locking holes 128 and 129 of the reinforcing plate, and as shown in FIGS. The swelling entry portions 108 and 109 are formed. As a result, the synthetic resin guide body and the reinforcing plate are fixed. Instead of the locking holes 128 and 129, a concave portion may be formed in the reinforcing plate 120, and the bulging-in portion formed by the same method as described above may be engaged with the concave portion (locking concave portion). It is possible.
[0015]
Since the bulging-in portions 108 and 109 are plastically deformed in accordance with the shapes of the locking recesses or the locking holes 128 and 129 of the reinforcing plate, the positions and shapes are strictly adjusted when forming the locking recesses or the locking holes. There is no necessity, and there is no gap between the bulging-in portion and the locking recess or the locking hole of the reinforcing plate. In FIG. 1, the shape of the locking recess or the locking hole is rectangular, but it may be circular or triangular.
[0016]
In the present invention, the material of the synthetic resin guide body is not particularly limited as long as it is a material that can be plastically deformed. Thermoplastics, which are excellent in abrasion and lubricity, and can maintain dimensional stability and mechanical properties at room temperature even at a high temperature of 100 ° C. or more, so-called engineering plastics, are preferable. The material of the reinforcing plate is not particularly limited as long as it is a rigid material capable of imparting sufficient strength to the movable lever, but is not limited to ferrous metals, non-ferrous metals such as aluminum, magnesium, and titanium; Engineering plastics and fiber-reinforced plastics having excellent rigidity and strength are preferred.
[0017]
Further, in the above embodiment, as a method of plastically deforming the synthetic resin guide body, the horn portion of the ultrasonic welding machine is pressed and melted and softened to be deformed. Can also be used. However, by using the horn portion of the ultrasonic welding machine as in the above-described embodiment, it becomes possible to locally heat, and the synthetic resin guide main body is deformed when the bulging-in portion is formed. It is particularly preferred because there is no In addition, the bulging-out portion in the present invention is formed by plastic deformation and is not directly welded to the synthetic resin guide body and the reinforcing plate. It can be selected without worrying about the combination.
[0018]
【The invention's effect】
As described above, the present invention is a movable guide for a transmission device, in which a locking recess or a locking hole is formed in at least one place of a reinforcing plate, and a synthetic resin guide body is formed by ultrasonic heating or the like. Since the bulging-in portion that fits with the locking concave portion or the locking hole is formed by plastic deformation, the positioning between the guide body and the reinforcing plate can be easily performed, and the locking concave portion or the locking hole and the bulging-in portion are formed. There is no play between them, and the two can be securely fixed.
[Brief description of the drawings]
FIG. 1 is an explanatory view for assembling a movable guide for a transmission device according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of the movable guide for the transmission shown in FIG. 1, taken along line AA.
FIG. 3 is a cross-sectional view of the movable guide for the transmission shown in FIG. 1 taken along line BB.
FIG. 4 is an explanatory view for assembling a conventional movable guide for a transmission.
[Explanation of symbols]
101, 301 ... Synthetic resin guide bodies 102, 302 ... Shoe portion 103, 303 ... Vertical plate-shaped portion 103 '... Reinforcement rib 104, 304 ... Flange 105, 305 ... Mounting Holes 106, 306 Boss 107, 307 Slit 108, 109 Swelling ingress 120, 320 Reinforcement plate 125, 325 Bolt insertion hole 128, 328 Stop holes 129, 329 Lock hole 200 Bolt 250 Horn part of ultrasonic welding machine

Claims (1)

It consists of a shoe portion that slides the running chain against the surface and a vertical plate-like portion that is provided on the back surface of the shoe portion in the longitudinal direction and has a slit that opens in the end portion in the longitudinal direction. An engine, a drive device, comprising: a synthetic resin guide body; and a reinforcing plate fitted into a slit of the synthetic resin guide body. A movable guide for a transmission device attached to a body such as
A locking recess or a locking hole is formed in at least one place of the reinforcing plate,
A movable guide for a power transmission device, wherein a swelling entry portion that fits into the locking recess or the locking hole by plastic deformation is formed in the synthetic resin guide body.

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