Pin shaft with lubricating oil channel for excavator

Abstract

The utility model discloses a pin shaft with a lubricating oil duct for an excavator, which comprises a shaft body, and the shaft body is provided with a through central oil duct; a groove-shaped first annular peripheral oil duct and a groove-shaped second annular peripheral oil duct are arranged on the outer wall of the shaft body; a first branch oil duct and a second branch oil duct are arranged in the shaft body; the central oil duct is communicated with the first annular peripheral oil duct through a first branch oil duct and is communicated with the second annular peripheral oil duct through a second branch oil duct; and the first branch oil duct and the second branch oil duct are arranged in a back-to-back manner. The pin shaft is provided with the lubricating oil channel, the annular peripheral oil channel enables lubricating grease to be distributed on the periphery of the shaft body, the shaft body is evenly lubricated, uniform lubrication is further enhanced through the back-to-back branch oil channels, and the eccentric wear phenomenon is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to engineering machinery technical field, concretely is a kind of pin shaft with self-lubricating oil channel for excavator. BACKGROUND

[0002] Excavator works on site for more than 8 hours per day, and the pin shaft at the connecting place of swing arm, bucket rod and other working devices needs to be lubricated with lubricating grease every day, which requires higher lubrication and maintenance work for the driver, and often leads to insufficient lubrication, excessive wear of pin shaft and further failure of excavator.

[0003] Publication No. CN220015753U discloses a pin shaft with slow-release lubrication structure, comprising a pin shaft body, an axial oil channel, a radial oil channel and a pressure cavity are arranged in the pin shaft body; the starting port of the radial oil channel is connected with the axial oil channel, and the end port of the radial oil channel is connected with the outer cylindrical surface of the pin shaft body; the starting port of the axial oil channel is connected with a grease nipple, and the end port of the axial oil channel is connected with the pressure cavity; the axial oil channel and the radial oil channel are used to contain lubricating grease and provide lubricating grease to the outer cylindrical surface of the pin shaft, and the pressure cavity is used to store energy and increase the oil pressure in the axial oil channel and the radial oil channel, so that the lubricating grease in the oil channel becomes pressure lubricating grease.

[0004] The lubricating oil outlet of the pin shaft in the prior art is a point-type outlet, which is easy to cause local lubrication and lead to uneven wear. UTILITY MODEL CONTENTS

[0005] In view of the above defects in the prior art, the purpose of the utility model is to provide a pin shaft with self-lubricating oil channel for excavator.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] A pin shaft with self-lubricating oil channel for excavator, comprising a shaft body, the shaft body is provided with a through central oil channel; the outer wall of the shaft body is provided with a first annular peripheral oil channel and a second annular peripheral oil channel in the form of grooves; a first branch oil channel and a second branch oil channel are arranged in the shaft body; the central oil channel is communicated with the first annular peripheral oil channel through the first branch oil channel, and the central oil channel is communicated with the second annular peripheral oil channel through the second branch oil channel; the first branch oil channel and the second branch oil channel are arranged back to back.

[0008] Further, one end of the central oil channel is provided with a threaded port, and the threaded port is used to install a grease nipple.

[0009] Further, the first branch oil channel and the second branch oil channel are radial oil channels.

[0010] Further, the first annular peripheral oil channel and the second annular peripheral oil channel are symmetrically distributed on the shaft body.

[0011] Further, the side wall of the first or second annular peripheral oil channel is a tapered transition surface connected with the outer wall of the shaft body by a circular arc surface.

[0012] Further, the shaft body is made of 42GrMo super high strength steel.

[0013] Further, the surface of the shaft body is provided with a high-frequency quenching layer with a thickness of 2-4mm and a hardness of HRC52-60.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] 1. The lubricating effect is better, the pin shaft is provided with a lubricating oil channel, the annular peripheral oil channel makes the lubricating grease distributed on the outer periphery of the shaft body, the shaft body is uniformly lubricated, and the branch oil channel arranged in the back direction further enhances the uniform lubrication and avoids the occurrence of eccentric wear.

[0016] 2. The material design fully considers the hardness of the pin shaft and the related machining performance, and effectively improves the reliability of the excavator. DRAWINGS

[0017] Figure 1 is a structural schematic view of the pin shaft with a lubricating oil channel for an excavator,

[0018] Figure 2 is Figure 1 an enlarged schematic view of B in the figure.

[0019] In the figure: 1, shaft body; 2, central oil channel; 3, first annular peripheral oil channel; 4, second annular peripheral oil channel; 5, first branch oil channel; 6, second branch oil channel; 7, threaded port; 8, tapered transition surface. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0021] Embodiment 1:

[0022] Please refer to Figure 1The utility model provides a kind of pin shaft with lubricating oil channel for excavator, including shaft body 1, the shaft body 1 is provided with through center oil channel 2, the outer wall of shaft body 1 is provided with the first annular peripheral oil channel 3 of slot, second annular peripheral oil channel 4, first branch oil channel 5, second branch oil channel 6 are arranged in the shaft body 1, the center oil channel 2 is communicated with the first annular peripheral oil channel 3 by first branch oil channel 5, the center oil channel 2 is communicated with the second annular peripheral oil channel 4 by second branch oil channel 6, first branch oil channel 5, second branch oil channel 6 are arranged back.

[0023] Grease reaches annular peripheral oil channel by center oil channel 2, branch oil channel, annular peripheral oil channel makes grease distribute in the periphery of shaft body 1, so that shaft body 1 is evenly lubricated, and first branch oil channel 5, second branch oil channel 6 arranged back further strengthen even lubrication, avoid the occurrence of eccentric wear phenomenon.

[0024] Specifically, one end of the center oil channel 2 is provided with a threaded port 7, which is used to install a grease nozzle, facilitating the injection of lubricating grease by a grease gun.

[0025] Specifically, the first branch oil channel 5 and the second branch oil channel 6 are designed radially along the shaft body 1.

[0026] Specifically, the first annular peripheral oil channel 3 and the second annular peripheral oil channel 4 are symmetrically distributed on the shaft body 1.

[0027] The pin shaft is arranged in the rotating parts between the bucket and the arm of the excavator, between the boom and the connecting rod, between the connecting rod and the arm, between the large arm and the rotating platform, etc. in actual use. The installation method is the existing pin shaft connection method. After installation, the threaded port 7 is exposed. Before or after installation, the port away from the threaded port 7 of the center oil channel 2 is sealed by a sealing plug, facilitating the injection of lubricating grease through the threaded port 7.

[0028] Example 2:

[0029] Based on example 1, combined with Figure 2 In this embodiment, the side wall of the first annular peripheral oil channel 3 or the second annular peripheral oil channel 4 is a tapered transition surface 8, which is connected to the outer wall of the shaft body 1 by a circular arc surface to facilitate the diffusion of lubricating grease. At the same time, the tapered transition surface 8 and the circular arc surface can reduce stress concentration.

[0030] In this embodiment, the shaft body 1 is made of 42GrMo ultra-high strength steel, which has good toughness and heat treatment performance, high fatigue limit and good impact resistance.

[0031] Specifically, the surface of the shaft body 1 is high-frequency quenched, with a quenching depth of 2-4 mm and a hardness of HRC52-60. After the pin shaft is processed, it needs to be non-destructively inspected, and it is required to be free of burrs, cracks, etc.

[0032] The embodiment fully considers the hardness of the pin shaft and the related machining performance in material design, and effectively improves the reliability of the excavator.

[0033] In the present application, the parts themselves that are not expanded, the connection mode of each part in the present application all belong to the known technology in the technical field.

[0034] In the present application, the term "a plurality of" refers to two or more, unless otherwise explicitly limited. The terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, "connecting" can be fixed connection, or detachable connection, or integrally connected; "connected" can be directly connected, or indirectly connected through an intermediate medium. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0035] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", "front", "back" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or unit referred to must have a particular direction, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application.

[0036] In the description of the present application, the terms "one embodiment", "some embodiments", "specific embodiments" and the like mean that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0037] The above is only the preferred embodiment of the present application, and is not intended to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A pin shaft with self-lubricating oil passage for a shovel, comprising a shaft body, characterized in that, The shaft body is provided with a through central oil channel; The outer wall of the shaft body is provided with a first annular peripheral oil channel and a second annular peripheral oil channel in the form of grooves; the shaft body is internally provided with a first branch oil channel and a second branch oil channel; The central oil channel is in communication with the first annular peripheral oil channel through the first branch oil channel, and the central oil channel is in communication with the second annular peripheral oil channel through the second branch oil channel; The first branch oil channel and the second branch oil channel are oppositely arranged.

2. The pin shaft with self-lubricating oil passage for a shovel according to claim 1, characterized by One end of the central oil channel is provided with a threaded port for mounting a grease nipple.

3. The pin shaft with self-lubricating oil passage for a shovel according to claim 1, characterized by The first branch oil channel and the second branch oil channel are radial oil channels.

4. The pin shaft with self-lubricating oil passage for a shovel according to claim 1, characterized by The first annular peripheral oil channel and the second annular peripheral oil channel are symmetrically distributed on the shaft body.

5. The pin shaft with self-lubricating oil passage for a shovel according to claim 1, characterized by The side wall of the first annular peripheral oil channel or the second annular peripheral oil channel is a tapered transition surface, which is connected to the outer wall of the shaft body through a circular arc surface.

6. The pin shaft with self-lubricating oil passage for a shovel according to claim 1, characterized by The material of the shaft body is 42GrMo super high strength steel.

7. The pin shaft with self-lubricating oil passage for a shovel according to claim 6, characterized by A high-frequency quenching layer is arranged on the surface of the shaft body, the thickness of the high-frequency quenching layer is 2-4 mm, and the hardness is HRC 52-60.

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