JPH0557041U - Piping structure of construction machinery - Google Patents

Abstract

(57) [Abstract] [Purpose] In the conventional piping structure of the crawler frame for construction machinery, due to vibration during operation, the hole edge of the notched hole in the motor housing mounting plate and the hydraulic pipe are There was a case where they contacted and caused wear damage to the hydraulic piping. Further, the vibration may loosen the tightening bolts for tightening the cover plate of the motor housing, and the cover plate may rattle and generate noise. The present invention solves the above problems. [Structure] In the piping structure of the present invention, a grommet member formed of a rubber material having elasticity is fitted along the hole edge of the cutout hole formed in the motor housing mounting plate of the crawler frame for construction machinery. When the grommet member is fitted into the cutout hole portion, the cover abutting surface portion of the grommet member is abutted and fixed by the attaching surface portion of the cover plate to be attached to the motor housing.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a piping structure of a portion of a steel plate that constitutes a vehicle body frame of a construction machine such as a hydraulic excavator, in which a notch hole is opened and a hydraulic pipe is passed through the notch hole.

[0002]

[Prior Art]

 FIG. 6 is a perspective view showing a main part assembly structure of the crawler frame 1 for a hydraulic excavator (not shown). In the figure, 2L and 2R are left and right track frames of the crawler frame 1, and 3 is a motor housing mounting plate welded to the rear portions of the track frames 2L and 2R, respectively. Since the respective structures of the rear portions of the track frames 2L and 2R are configured to be symmetrical to each other, the side of the track frame 2R will be described as a representative example. 4 is a cutout hole formed in the motor housing mounting plate 3, 5 is a motor housing, 6 is a block with screw holes fixed to the motor housing 5, 7 is a traveling motor, 8 is a plurality of hydraulic pipes, and 9 is hydraulic pressure. A clamp metal fitting for the pipe 8, 10 is a cover plate, 11 is an attachment hole opened in the cover plate 10, 12 is a tightening bolt, and 13 is a washer.

Next, a conventional piping structure of the hydraulic excavator track frame 1 will be described with reference to FIG. In the crawler frame 1, the motor housing mounting plate 3 is welded to the rear portion of the track frame 2R so that the plate thickness direction is in the left-right direction, and the notch hole portion 4 in which the hydraulic pipe (8) mounting side is open is formed. .. The hydraulic pipe 8 passing through the cutout hole portion 4 is clamped and fixed by the clamp metal fitting 9. Further, after mounting the hydraulic pipe 8, the cover plate 10 is tightened and fixed to the block 6 with screw holes of the motor housing 5 with the tightening bolt 12.

[0004]

[Problems to be solved by the device]

 In the conventional piping structure of the crawler frame for a hydraulic excavator, the hydraulic pipe is passed through a notched hole formed in the motor housing mounting plate, and the hydraulic pipe is clamped and fixed in the vicinity by a clamp metal fitting. However, the size of the cutout hole is set to the minimum size because of the strength of the motor housing mounting plate. As a result, the vibration of the hydraulic excavator during operation may cause the edge of the notch and the hydraulic pipe to come into contact with each other, causing wear and damage to the hydraulic pipe. In addition, the vibration may loosen the tightening bolts that are tightening the cover plate of the motor housing, causing the cover plate to rattle and generate noise. The present invention aims to solve the above problems.

[0005]

[Means for Solving the Problems]

 In the piping structure of the present invention, the motor housing mounting plate is welded to the rear part of the track frame of the hydraulic excavator crawler frame so that the plate thickness direction is in the left-right direction, and the hydraulic pipe mounting side is formed with a notched hole portion that is open. It is possible to fit a U-shaped grommet member having an opening side in front view along the hole edge of the above-mentioned notch hole portion for the hydraulic piping in, and the upper end of the U-shaped grommet member on the opening side. When the grommet member is fitted into the cutout hole, the cover abutting surface part is provided on the bottom end and the lower tip, respectively. I fixed it by touching it. Further, the grommet member is formed of a non-metal member having elasticity such as rubber.

[0006]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing an assembling structure of a main part of the pipe distribution structure of the present invention. In the figure, the same components as those in the conventional technology are designated by the same reference numerals. 1'is a crawler frame, 3'is a motor housing mounting plate, 14 is a grommet member, and 15 and 16 are cover abutting surface portions of the grommet member 14, respectively. FIG. 2 is a perspective view of essential parts showing a state before the grommet member 14 is fitted into the cutout hole portion 4 '. In the figure, 4'is a notched hole formed in the motor housing mounting plate 3 ', 17 and 18 are stepped parts for fitting the cover contact surface parts (15, 16) respectively, and 19 is a grommet member 14. It is a groove for fitting the formed motor housing mounting plate. The shape of the notch hole 4'in the front view is not limited to the U-shape in the front view as in the present embodiment, and may be an elliptical shape, but as a representative example, the U-shape is formed in the present invention. To do.

FIG. 3 is a front view of the grommet member 14 viewed from A of FIG. FIG. 4 is a side view of the grommet member 14 seen from B of FIG. FIG. 5 is a sectional view taken along line CC of FIG.

Next, the piping structure of the present invention will be described with reference to FIGS. In the piping structure of the present invention, the hydraulic excavator crawler frame 1'is welded to the rear portion of the track frame 2R so that the plate thickness direction is in the left-right direction, and the notch hole portion 4'where the hydraulic pipe 8 mounting side is open is formed. A U-shaped grommet member 14 having an opening side when viewed from the front can be fitted along the hole edge of the cutout hole portion 4 ′ of the motor housing mounting plate 3 ′. Of the cover plate 10 to be attached to the motor housing 5 when the cover abutting surface portions 15 and 16 are provided at the upper end and the lower end on the opening side, respectively, and the grommet member 14 is fitted into the cutout hole portion 4 '. The cover contact surfaces 15 and 16 of the grommet member 14 are abutted and fixed by a mounting surface portion (not shown by reference numeral but a mounting surface portion of the cover plate 10). Further, the grommet member 14 is formed of a non-metal member having elasticity such as a rubber material.

Next, the operation of the piping structure of the present invention will be described. Since the grommet member 4 made of a non-metal material such as a rubber material is fitted along the hole edge of the cutout hole portion 4'opened in the motor housing mounting plate 3 ', the operation of the hydraulic excavator is performed. Even if the crawler frame 1 ′ vibrates inside and the hydraulic pipe 8 comes into contact with the inner peripheral surface of the grommet member 14, the hydraulic pipe 8 is no longer worn or damaged. Further, since the cover abutting surface portions 15 and 16 of the elastic grommet member 14 are pressed and fixed on the mounting surface portion of the cover plate 10, the elastic force of the cover abutting surface portions 15 and 16 causes the tightening bolts. The trouble of loosening 12 and rattling of the cover plate 10 disappeared.

[0010]

[Effect of the device]

 In the conventional piping structure of the crawler frame for hydraulic excavators, due to vibration during operation, the hole edge of the notched hole in the motor housing mounting plate comes into contact with the hydraulic pipe, and the hydraulic pipe is worn and damaged. Sometimes caused. Further, the above-mentioned vibration may loosen the tightening bolts that are tightening the cover plate of the motor housing, causing the cover plate to rattle and generate noise. However, in the piping structure of the present invention, a U-shaped grommet member having an opening side in front view can be fitted along the hole edge of the cutout hole portion, and the opening side of the U-shaped grommet member can be fitted. When the grommet member is fitted into the cutout hole, the cover abutting surface is provided on the upper tip and the lower tip of the grommet member. The surface portions are abutted and fixed. Since the non-metal member such as rubber is used as the material of the grommet member, even if the crawler frame vibrates during hydraulic excavator operation and the hydraulic pipe comes into contact with the inner peripheral surface of the grommet member, the hydraulic pipe will wear There is no longer any risk of injury or damage. Also, since the cover abutting surface of the grommet member that has elasticity is pressed and fixed at the cover plate mounting surface, the elastic force of the cover abutting surface loosens the tightening bolts and rattles the cover plate. Trouble making noise is gone. Therefore, in the construction machine, work vehicle, etc. having the piping structure of the present invention, the maintainability of the hydraulic pipe can be improved and the rattling noise around the hydraulic pipe can be prevented.

[Brief description of drawings]

FIG. 1 is a perspective view showing a main part assembly structure of a piping structure of the present invention.

FIG. 2 is a perspective view of an essential part showing a state before a grommet member is fitted into a notched hole portion in the present invention.

FIG. 3 is a front view of the grommet member viewed from A of FIG.

FIG. 4 is a side view of the grommet member viewed from B of FIG.

FIG. 5 is a sectional view taken along line CC of FIG.

FIG. 6 is a perspective view showing an assembly structure of main parts of a crawler frame for a hydraulic excavator.

[Explanation of symbols]

 1,1 'Crawler frame 2L, 2R Track frame 3,3' Motor housing mounting plate 4.4 'Notched hole portion 5 Motor housing 6 Screw hole block 8 Hydraulic piping 9 Clamp metal fitting 10 Cover plate 12 Tightening bolt 14 Grommet Member 15, 16 Cover contact surface part

Claims (3)

[Scope of utility model registration request] 1. A notched hole portion for allowing a hydraulic pipe to pass in a direction orthogonal to a steel plate constituting a body frame of a construction machine, a work vehicle, etc., and a hole edge portion of the notched hole portion. , A piping structure that takes measures so as not to contact the hydraulic pipe, the grommet member is fitted along the cutout hole portion and the hole edge portion, and the hydraulic pressure is applied when the grommet member and the hydraulic pipe come into contact with each other. A piping structure for construction machinery, characterized in that the piping is designed so as not to wear and damage. 2. A cutout hole is formed in a steel plate constituting a vehicle body frame of a construction machine, a work vehicle or the like in a direction orthogonal to the steel plate, and a hole edge portion of the cutout hole is formed. The piping structure is designed so that it does not come in contact with the hydraulic piping, and is welded to the rear part of the track frame of the crawler frame for construction machinery so that the plate thickness direction is horizontal, and the hydraulic piping mounting side is open. A U-shaped grommet member having an opening side in a front view can be fitted along the hole edge of the cutout hole portion for hydraulic piping in the motor housing mounting plate in which the cutout hole portion is formed. , A cover contact surface is provided at each of the upper end and the lower end on the opening side of the U-shaped grommet member, and when the grommet member is fitted in the cutout hole, the cover plate is attached to the motor housing. A piping structure for a construction machine, characterized in that a cover contact surface portion of a grommet member is abutted and fixed by a surface portion. 3. The piping structure for a construction machine according to claim 1 or 2, wherein the grommet member is formed of an elastic non-metal member such as a rubber material. Piping structure.