JPS628230Y2 - - Google Patents

Description

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

Conventionally, noise reduction devices around the sprockets of tracked vehicles have been designed to reduce noise near the sprocket teeth in order to avoid direct metal-to-metal contact between the track bushings of the track chain wrapped around the sprocket and the sprocket teeth. It has been proposed that elastic pads are attached to both sides of the sprocket to elastically support the rail surface of the track link in the circumferential direction. In other words, since the elastic butt is fixed on the outside in the radial direction and is engaged with the track link, if the elastic butt reaches its wear limit due to repeated contact with the track link, it must be replaced with a new product. This was extremely uneconomical as a noise reduction device for sprockets that were used under relatively harsh conditions and had a short lifespan. Further, conventional elastic pads have a disadvantage that the structure for attaching them to the sprocket is complicated and the manufacturing cost is high.

The present invention has been made in order to eliminate the above-mentioned drawbacks of the conventional technology, and for this reason, the present invention is a noise reduction device around a sprocket of a tracked vehicle. comprising a plurality of shock absorbing members arranged along the sprocket, each shock absorbing member including a metal mounting piece removably fixed to the side of the sprocket by a bolt, and an elastic pad integrally fixed around the mounting piece. , and includes a support surface that presses directly against the side surface of the sprocket, and the elastic pad has a radially outer edge that presses outward to support a track link of a track chain wrapped around the sprocket, and a support surface that presses directly against the side surface of the sprocket. and a radially inner edge located substantially symmetrically to said outer edge, thereby allowing the cushioning member to be used in reverse, such that the elastic pad of each said cushioning member exposes its radially outer edge. It is characterized by being covered with a protective guard.

Hereinafter, the content of the present invention will be explained with reference to the accompanying drawings. Figures 1 and 2 show a sprocket drive part equipped with a noise reduction device according to the present invention, and a sprocket 1 has sprocket teeth 2 on its periphery. and has a hub 3 inside thereof. In the illustrated example, the sprocket teeth 2 are formed integrally with the hub 3.

A track chain 4 is wound around the sprocket 1 and engages with the sprocket teeth 2, and the track chain 4 connects the ends of adjacent track links 5 to a track pin (not shown) and fits onto the track pin. The sprocket teeth are connected by track bushings provided therein, and the engagement with the sprocket teeth is achieved through the track bushings. Further, a truck shoe 6 is bolted to the bottom of each truck link 5, as in a normal truck chain.

Therefore, the noise reduction device according to the present invention comprises a large number of buffer members 7, 7' arranged adjacent to each other along the circumferential direction in the vicinity of the sprocket teeth 2 on both sides of the sprocket hub 3. 7' is the sprocket hub 3 as shown in the diagram.
Attachment pieces 9, 9' made of elongated metal pieces that are removably fixed with bolts 8, and elastic pads made of rubber or the like that are fixed together by baking or the like around the attachment pieces 9, 9'. 10, 10' and a protective guard 11, 11' that covers around the elastic pad 10, 10'. As shown in FIGS. 3 and 4, each of the mounting pieces 9, 9' is
Each includes a pair of bolt mounting holes 12 and 12' penetrating from the front surface to the back surface, and the bolt mounting holes are cylindrical holes 12 in the case of the mounting piece 9 of the buffer member 7 on one side of the sprocket hub 3, and hub 3
The attachment piece 9 for the buffer member 7' on the other side has a threaded hole 12', so that by screwing in the bolt 8 from one side of the sprocket hub 3, the corresponding buffer members 7, 7 on both sides of the sprocket hub 3 can be attached. ' can be paired and tightened and fixed at the same time. In addition, the elastic pads 10, 1 of each buffer member 7, 7'
0' are the mounting pieces 9 and 9, respectively, as shown in the figure.
9' is formed almost symmetrically with respect to the vertical axis and the horizontal axis, and its radially outer edge 1
3 and 13' are designed to press the rail surface of the adjacent track link 5 outward in the radial direction to avoid direct engagement between the track bushing and the sprocket tooth 2 under normal conditions. direction inner edge 1
4 and 14' are located at positions symmetrical to the radially outer edges 13 and 13' with the mounting piece 9 as the center due to the symmetrical shape described above. In this way, the radially inner edges 14, 14' and the outer edges 13, 13' of the elastic pads 10, 10 are located symmetrically about the mounting pieces 9, 9, so that the radially outer edges 13, 13' , 13' reach the wear limit due to engagement with the track link 5, the elastic pads can be reversed and used. Further, the circumferential or longitudinal end edges 15, 15' of each of the elastic pads 10, 10' have a shape in which the central part protrudes from two straight parts, as shown in the figure.
Its radially inward straight section abuts a similar edge straight section of the respective adjacent damping members 7, 7' elastic pads 10, 10'. In this way, by abutting the edges of the adjacent elastic pads 7, 7', when a load is received from the track link 5, the plurality of elastic pads 7, 7' interfere with each other and reduce the load. It can be dispersed and absorb energy efficiently to enhance the sound deadening effect. Note that the inner and outer radial edges 14, 1 that engage with these track links 5
4', 13, and 13' are used to prevent damage near both ends of the elastic pads due to movement of the track link 5, and when the sprocket has an odd number of teeth, or even if the sprocket has an even number of teeth, it is necessary to install the track chain or prevent the track from jumping. In order to obtain an appropriate cushioning effect even when the sprocket teeth and bushing positions are shifted by one tooth, it is preferable to form the sprocket into a polygonal shape. Further, the bolt 8 is attached to the surface of the elastic pad 10 of the buffer member 7 on one side of the sprocket hub 3.
A recessed portion 16 is formed for accommodating the head of.
(Fig. 3) Furthermore, the protective guards 11, 11' that cover the areas around the elastic pads 10, 10' are formed from metal plates separately from the elastic pads 10, 10', and as shown in the figure, Elastic pad 10, 10'
It covers the front and back surfaces and radially inner edges 14, 14' of the elastic pads 10, 10', and exposes the radially outer edges 13, 13' and both circumferential edges 15, 15' of the elastic pads 10, 10'. It is formed in a U-shape. In addition, in the case of the protection guard 11 for the buffer member 7 on one side of the sprocket hub 3, the protection guard 11 for the buffer member 7' on the other side of the sprocket hub 3 is attached to both side walls thereof.
1', bolt through holes are formed in one side wall thereof. In this way, the elastic pad 1
By covering the area around 0,10' with protective guards 11,11', the elastic pads 10,1
0' can be protected from damage from the outside world, thereby protecting the elastic pads 10, 10'
When reversing the product, it can be used in the same condition as a new product.

To attach such shock absorbing members 7, 7' to the sprocket hub 3, each elastic pad 10, 10'
are housed in the protective guards 11, 11' as shown in the figure, and the sprocket hub 3 is placed in a symmetrical position with the sprocket hub 3 in between.
From one side, attach the bolt 8 to one buffer member 7 mounting piece 9.
It can be mounted by screwing it through the cylindrical hole 12 of the sprocket hub 3 and the bolt hole 17 provided in the sprocket hub 3 into the threaded hole 12' of the mounting piece 9' of the other buffer member 7'. In this way, the buffer member 7,
7' is attached by pressing directly onto the side of the sprocket hub 3, and the buffer members 7 and 7' on both sides of the sprocket hub can be paired and attached at the same time, simplifying the mounting structure and reducing manufacturing costs. can be reduced.

In the noise reduction device having the above-mentioned configuration, the elastic pads 10 and 1 of each buffer member 7 and 7' are normally used.
0' presses the rail surface of the track link 5 outward in the radial direction to separate the track bushing and the sprocket teeth 2, and when a predetermined force is applied to the track chain 4, the elastic pads 10 and 10' move in the radial direction. It bends inward to elastically engage the track bushing and the sprocket teeth 2, thereby reducing metal tapping noise caused by the engagement between the track bushing and the sprocket teeth. When the elastic pads 10, 10' reach the wear limit due to repeated engagement with the track link 5, the bolts 8 are removed and the elastic pads 10, 10' are attached to the protective guard 1.
1, 11', and invert and store the elastic pads 10, 10' in the protective guards 11, 11'.
By attaching this to the sprocket hub 3 again as shown in the figure, it can be reused, thereby giving the elastic pads 10, 10' about twice the life. Moreover, since the elastic pads 10, 10' are abutted against each other at both ends, the load from the track link 5 is transferred to the plurality of elastic pads 10, 10'.
It is possible to provide dispersed support, thereby increasing the silencing effect.

FIG. 5 shows another embodiment of the present invention, in which the sprocket tooth 2 and the sprocket hub 3 are separate bodies, and the sprocket tooth 2 is connected to the buffer member 7 by a bolt 8. , 7' are fastened together. Also, a buffer member 7' located on the vehicle body side of the sprocket hub 3
The width has been made slightly smaller so that it can be adapted to the limited installation space. The other configurations are the same as those of the previous embodiment.

As described above, when the present invention is used to reduce the noise around the sprocket of a tracked vehicle using a buffer member, it is economical because the life of the buffer member can be significantly extended, and it is also economical to reduce the noise around the sprocket of a tracked vehicle. Since the structure is simplified, manufacturing costs can be reduced, and installation space can be minimized to facilitate installation into existing vehicles.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a sprocket drive part of a tracked vehicle equipped with a noise reduction device according to the present invention;
2 is a sectional view taken along the line - in Fig. 1, Fig. 3a is a side view of the shock absorbing member on one side of the sprocket used in the device of the present invention, and Fig. 3b is a sectional view taken along the line - in Fig. 3a.
3c is an end view of the same, FIG. 4a is a side view of the shock absorbing member on the other side of the sprocket used in the device of the present invention, and FIG. 4b is a sectional view taken along the - line in FIG. FIG. 4c is an end view of the same, and FIG. 5 is a view similar to FIG. 2 showing another embodiment of the present invention. 1... Sprocket, 2... Sprocket tooth,
4... Track chain, 5... Track link, 7, 7'... Buffer member, 8... Tightening bolt,
9, 9'... Mounting piece, 10, 10'... Elastic pad, 11, 11'... Protective guard, 13, 13'...
...Outer edge, 14,14'...Inner edge, 15,1
5'...Edge.

Claims (1)

[Claims for Utility Model Registration] (1) A noise reduction device around a sprocket of a tracked vehicle, comprising a plurality of buffer members disposed along the circumferential direction on both sides of the sprocket near the sprocket teeth, Each buffer member includes a metal mounting piece that is removably fixed to the side of the sprocket by a bolt, an elastic pad that is integrally fixed around the mounting piece, and a support surface that is pressed directly against the side of the sprocket. ,
The elastic pad has a radially outer edge that presses outwardly to support the track link of the track chain wrapped around the sprocket, and a radially inner edge that is located approximately symmetrically to the outer edge around the mounting piece. a square edge, whereby the shock absorbing member can be used in reverse, and the elastic pad of each shock absorbing member is covered with a protective guard such that its radially outer edge is exposed. Reduction device. (2) The device according to claim 1, wherein the corresponding buffer members on both sides of the sprocket are simultaneously tightened by tightening bolts from one side of the sprocket.