JPH04262980A - Core metal for rubber crawler - Google Patents

Abstract

PURPOSE:To restrain the transmission of vibration to a machine body and the occurrence of abnormal sounds and enable the interchange of only engaging parts by constituting a sprocket engaging part of a core metal for a rubber crawler separately from a core metal body to stick the sprocket engaging part integrally to a recess in the core metal body through a rubber elastic body. CONSTITUTION:In a core metal A of a rubber crawler used for a construction equipment, agricultural machine, etc., square parts 13, 14 are respectively provided on the side opposing to blade parts 11, 12 embedded in a rubber elastic body. At the bases of these square parts 13, 14 circular recesses 15, 16 respectively in the widthwise direction of the rubber crawler. A metal pin 17 of a sprocket engaging part is fitted in the recess 15, 16 through the rubber elastic bodies 18, 19 on both ends. Or, right and left blade parts 41, 43 of the core metal C is formed in a series and at the center part thereof a recess 44 penetrating in the width direction of the rubber crawler is formed in the square part 43, where a metal pin 46(sprocket engaging part) is pressed-in fitted via a rubber elastic body 45.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a core metal for a rubber crawler used for running agricultural or construction machinery, and in particular to a core metal with a special structure for power transmission from a sprocket. .

0002

[Prior Art] In recent years, rubber tracks have been used in place of conventional metal shoe tracks, especially in construction machinery and civil engineering work machines.
la has started to be adopted. The characteristics of this type of rubber crawler are that the entire ground surface side is made of rubber elastic material, so it does not damage the concrete road surface when running, and it also softens the impact on the occupants from vibration input from the road surface. It has these characteristics and has become widely used.

[0003] As shown in FIG. 7, the structure of such a rubber crawler is generally such that the rubber elastic body 1 is made into an endless shape and is wound around the driving wheels and idle wheels (none of which are shown) of the aircraft body. A lug 2 is formed on the outer circumferential surface thereof to provide a propulsion force. Sprocket holes 3 are provided in the rubber elastic body 1 at regular intervals in the longitudinal center thereof, corresponding to the sprocket teeth formed on the drive wheel.
It has a structure in which a large number of core metals 4 are buried side by side between the sprocket holes 3, 3. The core bar 4 has a pair of corner parts 5, 5 protruding from its inner circumferential side.
A central portion 6 between the pair of corner portions 5, 5 is an engaging portion in which sprocket teeth engage and transmits driving force. However, this engaging portion 6 is subject to significant wear due to repeated contact with the sprocket, which may significantly shorten the durability of the rubber crawler. Further, the occurrence of abnormal noise due to the contact between the metals cannot be avoided, and the roughness caused by the contact between the metals is directly transmitted to the occupants as vibrations, resulting in an uncomfortable ride.

0004

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned problems that occur when power is transmitted by engagement between a core metal and a sprocket in such conventional rubber crawlers. The present invention provides a core metal whose engaging portion has a special structure.

[0005]

[Means for Solving the Problems] As a result of intensive development to solve the above-mentioned problems, the present invention has achieved its objects by adopting the following special configuration. That is,
The first invention includes left and right wing portions embedded in a rubber elastic body;
A core metal for a rubber crawler comprising a sprocket engaging part in the center of both wing parts and a corner part protruding from inside the rubber elastic body, the sprocket engaging part having a pair of desired corner parts, A rubber crawler characterized in that a recess facing in the width direction of the rubber crawler is formed opposite to this corner, and both ends of the sprocket engaging portion are fitted into the recess through a rubber elastic body. The second invention relates to a metal core, and the second invention comprises left and right wing parts embedded in a rubber elastic body, a sprocket engaging part in the center of both wing parts, and a corner part protruding from inside the rubber elastic body. A core metal for a rubber crawler comprising:
The corner protrudes from the center of both wing parts, and a penetrating recess facing the width direction of the rubber crawler is formed in this corner, and the center of the sprocket engaging part having a length protruding to both sides of the corner is made of rubber elastic material. This invention relates to a core metal for a rubber crawler, which is characterized in that it is fitted into the recess through the body.

[0006]

[Operation] The present invention relates to a core metal for a rubber crawler, in which the engagement portion with the sprocket is constructed separately from the main body of the core metal, and these are fixed and integrated via a rubber elastic body. The rubber elastic body interposed between the two reduces vibration, wear, noise, etc. when engaged with the sprocket, and improves the durability of the rubber crawler. That is, in the present invention, when the engaging part of the sprocket and the core metal is engaged and transmits power, the engaging part and the sprocket are in direct contact, and the engaging part has a rotational force. Although a force is applied to the engagement part, the rubber elastic body interposed in the engagement part elastically rotates slightly to release the force, thereby reducing wear on the engagement part. Similarly, the rubber elastic body absorbs vibrations and reduces the extent to which they are transmitted to the aircraft, and even when abnormal noises occur, the rubber elastic body can significantly reduce the generation of unpleasant sounds. It becomes something.

[0007] Furthermore, even if the engaging portion becomes severely worn due to long-term use, it is now possible to replace only this engaging portion. In addition, a pin with good durability is used for the engaging portion, for example, a hardened pin made of high manganese steel is used. The fitting between the engaging part and the recess is usually done by vulcanizing and adhering a rubber male body to the engaging part in advance and press-fitting it into the recess.
The fitting method is arbitrary.

[0008]

[Specific Examples] The present invention will be explained in more detail below with reference to the drawings. FIG. 1 is a plan view of a core metal A in the first invention, and FIG. 2 is a partially cutaway side view of this core metal. In the figure, reference numerals 11 and 12 indicate left and right wing sections embedded in the rubber elastic body, and corner sections 13 and 1 are located on opposite sides of the wing sections 11 and 12.
4 are provided respectively. These corner portions 13 and 14 serve as guides for the wheels and idlers, and depending on the situation, the wheels may run on the top of these corners. Now, this corner 13,1
A recess with a circular diameter facing in the width direction of the rubber crawler is formed at the base of the rubber crawler 4, and a metal pin 17 forming an engaging portion is press-fitted into the recess 15 and 16 with rubber elastic bodies 18 and 19 at both ends thereof. It is worn. In this example, the metal pin 1 is
Rubber elastic bodies 18 and 19 are vulcanized and bonded to both ends of the groove 7, and these are press-fitted into the depressions 15 and 16.

FIG. 3 is a partially cutaway side view of the core metal B showing another example of the first invention. In the figure, reference numerals 21 and 22 indicate wing sections, and the wing sections 21 and 22 are provided with a pair of corner sections 23 and 24. Above the corners 23, 24 are through-holes 25, 2 facing in the width direction of the rubber crawler.
6 is formed, and a metal pin 27 forming an engaging portion with the sprocket is press-fitted therein via rubber elastic bodies 28 and 29. In this core metal B, as can be seen in the figure, the bases of the wing parts 21 and 22 are connected by a bridge part 30. In this core metal B, wing parts 21 and 22 of the core metal B are embedded in a rubber elastic body as shown by dotted lines, and a sprocket (not shown) engages with a metal pin 27, but an idler - and wheels (none of which are shown) may run on the top surfaces of the corners 23, 24, or may run on land portions 31 provided on both outer sides of the corners 23, 24.

FIG. 4 is a partially cutaway side view of the core metal C in the second invention. In this example, the left and right wing parts 41, 4
2 are formed in series, and a corner 43 is provided at the center thereof. A recess 44 is formed in this corner 43 and extends in the width direction of the rubber crawler, into which a metal pin 46 is press-fitted via a rubber elastic body 45. In this case, the wing parts 41 and 42 of the core metal C are embedded as shown by dotted lines in the rubber elastic body constituting the base of the rubber crawler, and the idler and the roller (
(not shown) travels, and the sprocket shown by the dashed line engages with both ends of the metal pin 46.

FIG. 5 is a partially cutaway side view of a core metal D showing a modification of the present invention. In the figure, reference numerals 51 and 52 indicate the left and right wing parts of the core metal D, and a pair of corner parts 54 and 55 are formed in the engagement part 53 with the sprocket, and furthermore, a pair of corner parts 54 and 55 are formed on both sides thereof for fitting.
6 and 57, which are fitted into opposing recesses 58 and 59 facing in the width direction of the rubber crawler formed in the wing parts 51 and 52 via rubber elastic bodies 60 and 61. It is something that In this case, the fitting method is reversed, and fitting protrusions are formed on the wing parts 51 and 52, while the corner parts 54 and 5 are formed with fitting protrusions.
Of course, it is also possible to provide a recess at the base of 5 and fit the two through a rubber elastic body.

[0012] In the present invention, regarding the rubber elastic body interposed between the recess and the metal pin, it is common that one layer of rubber elastic body is interposed between the two, as shown in each of the above-mentioned figures. However, in some cases, as shown in FIG. 6, two layers 74 and 75 of rubber elastic bodies are placed between the depression 71 and the metal pin 72 with an intermediate ring 73 interposed between them, so that the so-called rubber elastic bodies are formed into multiple layers. Press-fitting is also performed. In this case, only one layer of the rubber elastic body is compressed, and the uncompressed rubber layer reliably performs the original behavior of the rubber elastic body, which helps the metal pin 72 with wear resistance.

[0013]

[Effect] The present invention provides a rubber cloth having the structure as described above.
Even if the sprocket and the engaging part of the core metal engage and the metals come into contact with each other, the wear of the engaging part is reduced, and the abnormal noise that was generated due to this contact is reduced. This greatly reduces the occurrence of both noise and vibration.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a core metal A in the first invention.

FIG. 2 is a partially cutaway side view of the core metal A in FIG. 1;

FIG. 3 is a partially cutaway side view of a core metal B showing another example of the first invention.

FIG. 4 is a partially cutaway side view of the core metal C in the second invention.

FIG. 5 is a partially cutaway side view of a core metal D showing a modification of the present invention.

FIG. 6 is a cross-sectional view showing press-fitting between a recess and a metal pin.

FIG. 7 is a cross-sectional view in the width direction of a conventional rubber crawler.

[Explanation of symbols]

A, B, C, D... Core metal 11, 12, 21, 22, 41, 42, 51, 52...
Wing parts 13, 14, 23, 24, 43, 54, 55...Corner part 1
5, 16, 25, 26, 44, 58, 59, 71...Indentation 17, 27, 46, 72...Metal pin (engaging portion) 18,
19, 28, 29, 45, 60, 61, 74, 75...
Rubber elastic body 30...Bridging portion 31...Land portion 53...Engaging portions 56, 57...Protrusion 73...Intermediate ring

Claims (2)

[Claims] Claim 1: A core for a rubber crawler comprising left and right wing sections embedded in a rubber elastic body, a sprocket engaging section at the center of both wing sections, and a corner section protruding from the rubber elastic body. A pair of corners are formed on the sprocket engaging part, and a depression facing in the width direction of the rubber crawler is formed opposite to the corner parts, and both ends of the sprocket engaging part are made of rubber elastic material. A core metal for a rubber crawler, characterized in that the core metal is fitted into the recess through the body. 2. A core for a rubber crawler comprising left and right wing parts embedded in a rubber elastic body, a sprocket engaging part in the center of the two wing parts, and a corner part protruding from the rubber elastic body. The corner portion protrudes from the center of both wing portions, a through recess is formed in the corner portion facing in the width direction of the rubber crawler, and a sprocket engaging portion having a length protruding from both sides of the corner portion is formed. A core metal for a rubber crawler, characterized in that the center is fitted into the recess through a rubber elastic body.