JPS628232Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a noise reduction device around an idler of a tracked vehicle.

Conventionally, as a noise reduction device around the idler of a tracked vehicle, a track chain is installed on the outer circumferential surface of the idler in order to reduce metal tapping noise through direct engagement between the track link rail surface of the track chain and the idler tread. An annular body made of hard rubber is provided to elastically support the truck bushing radially outward, and the annular body is held in place by ring-shaped rims forming a pair of left and right idler treads bolted along both side edges of the outer periphery of the idler. However, since the height of such an annular body made of hard rubber cannot be adjusted, it should not be used when the annular body reaches its wear limit due to repeated contact with the track bushing. This is extremely uneconomical as a noise reduction device for the idler, which is used under relatively harsh conditions and has a short lifespan.
In addition, even if the annular body itself is not worn, if the track chain becomes loose or the tread surface of the idler itself and the rail surface of the track link are worn and the distance between the idler outer circumferential surface and the track bushing changes, the annular body may become excessive. Due to the pressure or insufficient pressure, it is not possible to maintain an appropriate cushioning action between the truck bushing and the idler. Furthermore, with an annular body made of hard rubber, it is not possible to obtain a sufficiently large cushion stroke while maintaining durability, and it is difficult to achieve effective noise reduction. In addition,
Conventional annular bodies have the drawback of being cumbersome to attach to the idler body, resulting in high manufacturing costs.

The present invention has been made to eliminate the above-mentioned conventional drawbacks, and for this reason, the present invention is a noise reduction device around an idler of a tracked vehicle, and includes:
A pneumatic tire having a tube inside and a means for adjusting internal pressure is installed around the outer circumferential surface of the idler, and the base of the tire is connected to the idler body along one side edge of the outer circumference of the idler. A ring-shaped projection formed along the outer periphery of the rim forming one idler tread integrally formed, and the other idler tread removably fixed to the idler main body along the other side edge of the idler outer periphery. A means capable of adjusting the internal pressure of the tube is inserted between the tube and a ring-shaped protrusion formed along the outer surface of the rim, and penetrates from the outer circumferential surface of the idler to the inner circumferential portion of the one rim. The track bushing of the track chain wrapped around the idler is pushed radially outward by the outer circumferential surface of the tire, and the track of the track chain is It is characterized in that the link is spaced apart from the idler tread.

Hereinafter, a preferred embodiment of the present invention will be described with reference to the accompanying drawings. The figure shows a central cross section of the outer peripheral part of an idler equipped with a noise reduction device according to the present invention. A main body 3 including a hollow chamber 2 filled with material etc., and a track chain 4 formed integrally with the idler main body 3 along one side edge of the outer periphery of the idler main body 3 and wound around the idler 1. a rim 7 forming an idler tread 6 engageable with one of the track links 5;
and an idler tread 10 which is removably attached to the idler body 3 by bolts 8 along the other side edge of the outer periphery of the idler body 3 and which is engageable with the other track link 9 of the track chain 4. It is equipped with a rim 11. The other rim 11 may be an integrally formed annular rim or may be a split annular rim.

Therefore, the noise reduction device according to the present invention is composed of a pneumatic tire 13 disposed around the outer peripheral surface 12 of the idler body 3, and the tire 13 has its base 14 formed along the outer surface of the one rim 7. It is fixed around the idler body 3 by being held under pressure between the ring-shaped projection 15 and the ring-shaped projection 16 formed along the outer surface of the other rim 11. A tube 17 is installed inside the tire 13, and a pipe 18 and a valve 19 connected to the tube 17 are connected to a passage 20 which is provided from the outer circumference to the inner circumference of one of the rims 7. It is guided to the inner peripheral part of the rim 7 through the valve 19, and the internal pressure is adjusted through the valve 19. The internal pressure of the tire 13 is
1 constantly presses the track bush 22 of the track chain 4 radially outward to connect the track links 5 and 9.
When the idler tread surfaces 6 and 10 are separated and a predetermined force is applied to the track chain 4, the tire 13 is deflected radially inward, causing the track link 5,
9 and the idler treads 6, 10, thereby allowing the track links 5, 9 to engage with each other.
It is designed to reduce noise by alleviating the metal tapping sound caused by direct contact between the idler treads 6 and 10.

In the present invention, as described above, the pneumatic tire 13 whose internal pressure can be adjusted is used to provide a cushioning effect between the track links 5, 9 and the idler tread surfaces 6, 10, so that the surface of the tire 13 repeatedly comes into contact with the track bush 22. Even if the height of the tire decreases to the limit of use due to wear
3 By increasing the internal pressure, a predetermined cushion stroke can be again applied between the track links 5, 9 and the idler treads 6, 10, thereby greatly extending the life of this type of noise reduction device. . Furthermore, the distance between the idler outer circumferential surface 12 and the track bush 22 may change due to the track chain 4 becoming loose, or the track links 5 and 9 and the idler tread surfaces 6 and 10 becoming worn due to repeated contact between them. However, by increasing or decreasing the internal pressure of the tire 13, a desired cushion stroke can always be formed and maintained between the track links 5, 9 and the idler tread surfaces 6, 10. Furthermore, a pneumatic tire 13 is used as a cushion member.
By using the cushion stroke, the cushion stroke can be increased without sacrificing durability, thereby increasing the sound deadening effect. Further, in the present invention, when the tire 13 is fixed around the idler body 3, the tire base 14 is fixed around the idler body 3.
Since the rim 7, which is integrally formed with the rim 7, and the rim 11 bolted to the idler body 3 are sandwiched and held, it is only necessary to bolt the rim on one side of the idler when installing the tire. It is possible to facilitate tire mounting work and reduce manufacturing costs.

[Brief explanation of the drawing]

The figure shows a central sectional view of the outer periphery of an idler equipped with an embodiment of the present invention. 1...Idler, 3...Idler body, 4...
Truck chain, 5, 9...Truck link,
6,10...Idler tread, 7,11...Rim,
12...Outer peripheral surface, 13...Tire, 14...Base, 22...Truck bushing.

Claims (1)

[Claims for Utility Model Registration] (1) A noise reduction device around an idler of a tracked vehicle, which includes a tube installed inside the idler along the outer circumferential surface of the idler, and has a means for adjusting internal pressure. A ring-shaped protrusion formed along the outer surface of a rim that forms one idler tread surface, around which a tire is disposed, and the base of the tire is integrally formed with the idler main body along one side edge of the outer periphery of the idler. and a ring-shaped protrusion formed along the outer surface of the rim forming the other idler tread removably fixed to the idler main body along the other side edge of the outer periphery of the idler, The means capable of adjusting the internal pressure of the tube is led from the outer circumferential surface of the idler to the inner circumferential portion of the one rim through a passage provided through the inner circumferential portion of the one rim. A noise reduction device characterized in that the track link of the track chain is separated from the idler tread surface by pressing a track bush of a track chain wrapped around the idler radially outward. (2) The device according to claim 1, wherein the rim forming the other idler tread surface is an integrally formed annular rim or a split rim.