Leak-proof six-axis robot end joint bearing

Abstract

The utility model discloses a belong to bearing technical field, concretely is a kind of anti-leakage oil six-axis robot end joint bearing, including outer ring and inner ring, the inner ring is located the inside of outer ring, inner ring baffle outer diameter is equipped on the inner ring, the side end face of the inner ring directly connected with oil cavity without installing oil seal is close to inner ring baffle outer diameter place and is equipped with U-shaped wedge groove, U-shaped wedge groove place is equipped with U-shaped end face wedge. The U-shaped end face wedge is connected with the inner ring by inner hexagon screw. The middle part between the outer ring and the inner ring is equipped with several rollers. The utility model is through setting U-shaped wedge groove and U-shaped end face wedge, and further through setting framework oil seal, not only can make the assembly efficiency and use performance of bearing greatly improve, also can completely eliminate oil gas from bearing outer diameter place leakage, improve reliability, simultaneously, without installing oil seal on wedge, do not need to make air-tight test, save the installation time, improve efficiency.

Description

Technical Field

[0001] This utility model relates to the field of bearing technology, specifically to an oil-leakage-proof end joint bearing for a six-axis robot. Background Technology

[0002] Crossed roller bearings are widely used in the joints of industrial robots due to their high rigidity, high precision, and ability to withstand radial and axial loads as well as overturning moments. The inner and outer rings of this type of bearing are integral structures, requiring notches to be cut in the rings during assembly to accommodate the rollers.

[0003] like Figure 3 and Figure 4 As shown, the commonly used ball loading structure is to open a cylindrical wedge hole on the outer diameter of the outer ring, load rollers into the raceway from the wedge hole, and add a cylindrical wedge 10 after the rollers are full. Then, the wedge 10 is fixed by the end face tapered pin 09. This structure is simple to manufacture and easy to implement. However, because the bearing end face is connected to the oil cavity at the mounting location, oil and air pressure exist within the oil cavity. Oil can enter the bearing interior. If a reliable oil seal is not installed on the plug and the tapered pin 09, oil and air will leak outward from the plug and plug hole, as well as the gap between the tapered pin 09 and the tapered pin hole. Although adding an O-ring 11 to the outer diameter of the wedge block 10 can prevent oil and air leakage, the O-ring 11 needs to pass through a tapered pin hole during manual installation and pressing into the wedge block hole. The cutting problem of the O-ring 11 is difficult to completely avoid. Therefore, after assembly, an airtightness test is required to ensure that the installed O-ring 11 is not damaged and does not leak air. Since airtightness testing at bearing manufacturers is static, some O-rings with slight damage may pass the airtightness test, but oil and air leakage still frequently occurs during dynamic operation after being delivered to customers, causing many inconveniences for installation and subsequent maintenance. Therefore, an oil-leakage-proof six-axis robot end joint bearing is invented. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution: An oil-leakage-proof six-axis robot end joint bearing includes an outer ring and an inner ring. The inner ring is located inside the outer ring. The inner ring has an inner ring retaining edge outer diameter. A U-shaped wedge groove is opened on the side end face of the inner ring that is directly connected to the oil cavity without an oil seal. A U-shaped end face wedge is fitted in the U-shaped wedge groove.

[0005] As a preferred embodiment of the oil-leakage-proof six-axis robot end joint bearing described in this utility model, the U-shaped end face wedge is connected to the inner ring by an internal hexagon screw.

[0006] As a preferred embodiment of the oil-leakage-proof six-axis robot end joint bearing described in this utility model, a plurality of rollers are provided in the middle between the outer ring and the inner ring.

[0007] As a preferred embodiment of the oil-leakage-proof six-axis robot end joint bearing described in this utility model, a skeleton oil seal is provided on the right side between the outer ring and the inner ring.

[0008] Compared with existing technologies: By setting U-shaped wedge grooves and U-shaped end face wedges, and by setting skeleton oil seals, not only can the assembly efficiency and performance of bearings be greatly improved, but oil and gas leakage from the outer diameter of the bearing can also be completely eliminated, improving reliability. At the same time, there is no need to install oil seals on the wedges, eliminating the need for air tightness testing, saving installation time and improving efficiency. Attached Figure Description

[0009] Figure 1 This is a front view schematic diagram of the structure of this utility model; Figure 2 This is a side view of the structure of this utility model; Figure 3 A schematic diagram showing the existing technology; Figure 4 This is a side view diagram of existing technology.

[0010] In the diagram: Outer ring 01, Roller 02, Oil seal 03, Inner ring 04, Socket head screw 05, U-shaped end face wedge 06, U-shaped wedge groove 07, Outer diameter of inner ring flange 08. Detailed Implementation

[0011] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0012] This utility model provides an oil-leak-proof end joint bearing for a six-axis robot. Please refer to [link / reference]. Figures 1-4 It includes an outer ring 01 and an inner ring 04. The inner ring 04 is located inside the outer ring 01. The inner ring 04 is provided with an inner ring retainer outer diameter 08. A U-shaped wedge groove 07 is opened on the end face of the inner ring 04 that is directly connected to the oil cavity without an oil seal, near the inner ring retainer outer diameter 08. A U-shaped end face wedge 06 is fitted in the U-shaped wedge groove 07. The U-shaped end face wedge 06 is connected to the inner ring 04 by an internal hexagon screw 05. Several rollers 02 are provided in the middle between the outer ring 01 and the inner ring 04. A skeleton oil seal 23 is provided on the right side between the outer ring 01 and the inner ring 04.

[0013] In practical use, the specific operating steps for those skilled in the art are as follows: S1: A U-shaped wedge groove 07 is opened on the end face of the inner ring 04 of the bearing that is not directly connected to the oil chamber without an oil seal, near the outer diameter 08 of the inner ring flange. The width of the U-shaped wedge groove 07 should be sufficient to allow the roller 02 to be smoothly installed into the raceway of the bearing. S2: A U-shaped end face wedge 06 is installed at the U-shaped wedge groove 07, and the U-shaped end face wedge 06 is connected to the inner ring 04 by an internal hex screw 05; S3: During the initial machining and subsequent grinding, the U-shaped end face wedge 06, which is connected to the inner ring 04 of the bearing by the internal hex screw 05, is used as a whole to process the bearing raceway simultaneously. After the raceway processing of the inner ring 04 and the outer ring 01 is completed, the final assembly and fitting stage will begin. Before the roller 02 is installed after the outer ring 01 is matched with the appropriate inner ring 04, the internal hex screw 05 needs to be loosened to remove the U-shaped end face wedge 06. Then, the roller 02 is installed into the raceway through the U-shaped wedge groove 07. After the roller 02 is installed, the U-shaped end face wedge 06 can be reinstalled into the U-shaped wedge groove 07 and fixed by the internal hex screw 05. S4: After the U-shaped end face wedge 06 is fixed, the bearing can be rotated to check if there is a problem with its flexibility. If not, an appropriate amount of special grease will be added, and the skeleton oil seal 03 will be pressed in afterward to complete the entire bearing assembly process. Based on the above, this type of bearing with a wedge on the inner ring end face, because one end face with the wedge slot is directly connected to the equipment oil cavity, although there is a gap between the wedge and the wedge slot, the other end face is equipped with a skeleton oil seal. The oil entering the bearing cavity from the equipment oil cavity can only flow back to the equipment oil cavity through the gap between the wedge and the wedge hole, and will not leak to the outside. This structure eliminates the need to consider the oil seal problem at the wedge, and since there is no pin hole on the end face, there is no need to consider the pin hole oil leakage problem, saving installation time and reducing the company's later maintenance costs.

[0014] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the features in the embodiments disclosed in this invention can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A leak-proof end effector bearing for a six-axis robot, comprising an outer ring (01) and an inner ring (04), wherein the inner ring (04) is located inside the outer ring (01), characterized in that, The inner ring (04) is provided with an inner ring flange outer diameter (08). The inner ring (04) is provided with a U-shaped wedge groove (07) near the inner ring flange outer diameter (08) on the side end face where the oil seal is not installed and is directly connected to the oil cavity. A U-shaped end face wedge (06) is fitted in the U-shaped wedge groove (07).

2. The oil-leakage-proof six-axis robot end joint bearing according to claim 1, characterized in that, The U-shaped end face wedge (06) is connected to the inner ring (04) by an internal hexagon screw (05).

3. The oil-leakage-proof six-axis robot end joint bearing according to claim 1, characterized in that, A plurality of rollers (02) are provided in the middle between the outer ring (01) and the inner ring (04).

4. The oil-leakage-proof six-axis robot end joint bearing according to claim 1, characterized in that, A skeleton oil seal (23) is provided on the right side between the outer ring (01) and the inner ring (04).

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