Bearing space ring and sealing element

Abstract

The bearing space ring comprises a ring body, oil injection channels are formed in the ring body, the oil injection channels are arranged at intervals in the circumferential direction and are divided into the left side oil injection channel and the right side oil injection channel, and a sealing groove is further formed in the outer circumferential face of the bearing space ring and communicated with the left side oil injection channel and the right side oil injection channel. The sealing grooves comprise circular sealing grooves formed in the two axial sides of the oil injection channels and strip-shaped sealing grooves connected with the circular sealing grooves, and the strip-shaped sealing grooves are formed between the left side oil injection channel and the right side oil injection channel in the circumferential direction. According to the bearing space ring, it is guaranteed that the size of the bearing space ring in the axial direction cannot be increased, and meanwhile a better sealing effect is achieved through the circular sealing grooves formed in the two axial sides of the oil injection channel and the strip-shaped sealing grooves connected with the circular sealing grooves.

Description

Technical Field

[0001] The invention relates to the field of mechanical basic parts, and in particular to a bearing spacer and a sealing element. Background Art

[0002] In the spindle system of machine tools, the electric spindle is one of the core components. With the continuous advancement of processing technology, high-speed and high-precision processing has put forward higher requirements for the lubrication of the electric spindle. Traditional bearing lubrication methods are mostly grease lubrication, oil lubrication, etc. These lubrication methods are mostly over-lubrication, which not only wastes resources, but also generates additional friction torque in the bearing, affecting the bearing performance and limiting the maximum speed of the electric spindle. In order to increase the bearing speed, high-speed bearings currently use oil-gas lubrication.

[0003] However, gas path isolation in oil-gas lubrication systems is a key issue. In the long-term use of traditional oil-gas lubrication systems, it is easy for the lubricating oil and gas to interfere with each other in the return oil path and the inlet oil path between the spacer assembly and the bearing seat, resulting in the lubricating oil and gas not being able to smoothly enter the bearing raceway, and being unable to effectively solve the problems of excessive heating and low working efficiency of the bearing.

[0004] In view of the above problems, a Chinese utility model patent with authorization announcement number CN2628791Y and authorization announcement date 2004.07.28 in the prior art discloses a novel high-speed spindle unit bearing lubricating oil and gas delivery device. The utility model designs the device for delivering oil and gas from the spindle unit to the bearing into a circular ring spacer form, and two oil-passing ring grooves are arranged on the outer peripheral surface of the spacer, and a sealing groove is arranged on the outer peripheral surface of the spacer between the two oil-passing ring grooves. An oil and gas channel is arranged on the oil-passing ring groove, and the oil and gas channel is connected to an oblique through hole, i.e., a spray hole. A sealing ring is added at the sealing groove of the spacer. The sealing groove of the spacer of the utility model is one and is located in the middle position of the spacer along the axial direction, and the oil and gas sprayed from the spray holes on both sides in the axial direction are blocked by the sealing ring. However, when in use, since there is only one sealing ring, its sealing effect is limited, and it may still cause the oil and gas in each oil circuit to interfere with each other, reducing the lubrication effect, and further affecting the working performance and service life of the bearing; if the number of sealing grooves is simply increased to enhance the sealing effect, then the axial size of the spacer will increase, thereby increasing the size of the entire electric spindle. Summary of the invention

[0005] The object of the present invention is to provide a bearing spacer to solve the problem in the prior art that it is not possible to improve the sealing effect while ensuring that the axial dimension of the bearing spacer does not change much. The object of the present invention is also to provide a sealing member to solve the above technical problem.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions.

[0007] A bearing spacer includes a ring body, in which an oil injection channel is provided. The oil injection channels are arranged at intervals in the circumferential direction and are divided into a left oil injection channel and a right oil injection channel. A sealing groove is also provided on the outer circumferential surface of the bearing spacer, and the sealing groove includes a circular sealing groove arranged on both axial sides of the oil injection channel and a strip sealing groove connecting the circular sealing grooves. In the circumferential direction, the strip sealing groove is arranged between the left oil injection channel and the right oil injection channel.

[0008] Furthermore, the ring body is divided into two areas in the circumferential direction, and the left-side oil injection channel and the right-side oil injection channel are respectively located in the two areas.

[0009] Furthermore, there is one left fuel injection channel and one right fuel injection channel, and the two are 90 degrees apart in the circumferential direction. There are two strip sealing grooves, and they are respectively located in the circumferential middle position of the left fuel injection channel and the right fuel injection channel.

[0010] Furthermore, the strip-shaped sealing groove is a linear sealing groove extending in the axial direction.

[0011] Furthermore, the oil injection channel includes an oil and gas channel extending in the radial direction and a spray hole extending obliquely from the inner end of the oil and gas channel to one end of the ring body, and the oil and gas channels of each oil injection channel are located on the same plane perpendicular to the axis.

[0012] Furthermore, the oil injection channel includes an oil and gas channel extending in the radial direction and a spray hole extending obliquely from the inner end of the oil and gas channel to one end of the ring body, and an oil collecting groove is provided on the outer peripheral surface of the ring body at the inlet of each oil and gas channel.

[0013] Furthermore, the bottom of the oil collecting groove is perpendicular to the oil and gas channel, and the groove wall of the oil collecting groove is parallel to the end surface of the bearing spacer.

[0014] The above technical scheme has the following beneficial effects: the present invention is an invention with a changed element relationship, and specifically proposes a bearing spacer. The bearing spacer in the prior art has an oil injection channel arranged at the end face of the bearing spacer in the axial direction, and a sealing groove is provided on the outer peripheral surface of the bearing spacer between the oil injection channels on both sides in the axial direction. The oil injection channel of the bearing spacer of the present invention includes a left oil injection channel and a right oil injection channel, and the left oil injection channel and the right oil injection channel are arranged on the same circumference, and circular sealing grooves are provided on both sides of the oil injection channel on the outer peripheral surface of the bearing spacer, and a strip sealing groove connecting the circular sealing grooves is also provided between the left oil injection channel and the right oil injection channel in the circumferential direction. It ensures that the size of the bearing spacer in the axial direction will not increase, and at the same time, a better sealing effect is achieved by providing the circular sealing grooves on both sides of the oil injection channel in the axial direction and the strip sealing grooves connecting the circular sealing grooves.

[0015] A sealing component comprises a pair of circular sealing rings and at least two sealing strips connecting the two paired circular sealing rings. The sealing component is an integral sealing component.

[0016] Furthermore, the sealing strip is a sealing strip extending in the axial direction.

[0017] Furthermore, there are two sealing strips, which are symmetrically arranged in the circumferential direction.

[0018] The above technical scheme has the following beneficial effects: the present invention provides a pioneering seal, which is used on the above-mentioned bearing spacer, and can not only block the oil and gas on both sides of the bearing spacer in the axial direction, but also block the oil and gas between different injection channels in the circumferential direction of the bearing spacer. When the integral seal is used, it can more effectively prevent the oil and gas between different lubrication oil circuits from interfering with each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of an embodiment of a bearing spacer of the present invention.

[0020] Figure 2 An embodiment of the bearing spacer of the present invention is Figure 3 Cross-sectional view at the AA position.

[0021] Figure 3 An embodiment of the bearing spacer of the present invention is Figure 2 Cross-sectional view of the BB position.

[0022] Figure 4 It is a schematic diagram of an embodiment of the sealing element of the present invention.

[0023] Figure 5 The present invention is a cross-sectional view of an electric spindle using a bearing spacer according to an embodiment of the present invention.

[0024] In the figure: 1, oil and gas channel; 2, spray hole; 3, circular sealing groove; 4, oil collecting groove; 5, circular sealing ring; 6, sealing strip; 7, rotating shaft; 8, front bearing; 9, front bearing spacer; 10, housing; 11, left oil and gas channel; 12, right oil and gas channel; 13, stator assembly; 14, rotor assembly; 15, rear bearing spacer; 16, rear bearing; 17, front bearing oil inlet channel; 18, rear bearing oil inlet channel; 21, Left side spray hole; 22, right side spray hole; 23, left side oil inlet of front bearing; 24, left side oil inlet of rear bearing; 25, right side oil inlet of rear bearing; 26, right side oil inlet of front bearing; 27, oil connection nozzle; 28, front cover; 29, front bearing seat; 30, rear cover; 31, first circular sealing groove; 32, second circular sealing groove; 33, strip sealing groove; 34, rear bearing seat; 41, first oil collecting tank; 42, second oil collecting tank. DETAILED DESCRIPTION

[0025] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0026] The present invention provides a bearing spacer, wherein the ring body of the bearing outer spacer is provided with injection channels which are arranged at intervals in the circumferential direction of the ring body and are divided into a left-side injection channel and a right-side injection channel, circular sealing grooves and strip sealing grooves connecting the circular sealing grooves are provided on both axial sides of the injection channels, the strip sealing grooves are arranged between the left-side injection channel and the right-side injection channels, the circular sealing grooves block the oil and gas in different oil paths on both axial sides of the bearing spacer, and the strip sealing grooves block the oil and gas in different injection channels in the circumferential direction of the bearing spacer, thereby ensuring the axial size of the bearing spacer and having a more reliable sealing effect.

[0027] Based on the above concept, the present invention provides a variety of different embodiments of bearing spacers for illustration.

[0028] In a basic embodiment, Figure 1 , Figure 3 As shown, the bearing spacer includes a ring body, an oil injection channel is opened inside the ring body, the oil injection channel includes an oil and gas channel 1 and a spray hole 2, the oil and gas channel 1 includes a left oil and gas channel 11 and a right oil and gas channel 12, the spray hole 2 includes a left spray hole 21 and a right spray hole 22, the left oil injection channel and the right oil injection channel are arranged at intervals in the circumferential direction, and a sealing groove is also opened on the outer circumferential surface of the bearing spacer, including a circular sealing groove 3 arranged on both sides of the oil injection channel axially and a strip sealing groove 33 connecting the circular sealing groove 3, and the strip sealing groove 33 is arranged between the left oil and gas channel 11 and the right oil and gas channel 12 in the circumferential direction, thereby ensuring the axial size of the bearing spacer and making the bearing spacer have a more reliable sealing effect.

[0029] On the basis of the above embodiment, the left injection channel and the right injection channel are arranged alternately in the circumferential direction of the ring body, that is, the left injection channel, the right injection channel, the left injection channel, and the right injection channel are arranged in sequence. In a preferred embodiment, as Figure 1-3 As shown, the ring body is divided into two areas in the circumferential direction, and the left injection channel and the right injection channel are respectively located in the two areas.

[0030] On the basis of the above embodiment, the ring body can be provided with a plurality of left-side injection channels and a plurality of right-side injection channels in the circumferential direction, and the left-side injection channels and the right-side injection channels can be symmetrically arranged about the circumferential direction. Figure 1-3As shown, there is one left oil injection channel and one right oil injection channel, and the two are 90 degrees apart in the circumferential direction. The strip sealing groove 33 is arranged in the circumferential middle position of the left oil injection channel and the right oil injection channel. Such arrangement facilitates the assembly of the bearing spacer, and the bearing spacer can also have a good sealing effect.

[0031] On the basis of the above embodiment, there can be multiple strip-shaped sealing grooves 33 provided on the circumference of the ring body, and they are provided between the left injection channel and the right injection channel. Figure 2-3 As shown, there is one left oil injection channel and one right oil injection channel, and the two are 90 degrees apart in the circumferential direction. There are two strip sealing grooves 33, and they are respectively located in the circumferential middle position of the left oil injection channel and the right oil injection channel. In this way, the structure of the bearing spacer is simple and can also have a good sealing effect.

[0032] Based on the above embodiment, the strip sealing groove 33 may be in the shape of a curve or a broken line. Figure 1 As shown, the strip sealing groove 33 is a straight sealing groove extending in the axial direction, so that the operation of opening the strip sealing groove 33 on the bearing spacer is simple and convenient for manufacturing.

[0033] In the above embodiment, the oil injection channel can be a linear channel, extending obliquely from the outer circumference of the ring body to one end of the ring body, the inlet of the oil injection channel is located on the outer circumference of the ring body, and the oil inlet channel of the main shaft is directly connected to the inlet of the oil injection channel. Figure 1 , Figure 3 As shown, the oil injection channel includes an oil and gas channel 1 extending in the radial direction and a spray hole 2 for spraying oil and gas, which extends obliquely from the inner end of the oil and gas channel to one end of the ring body. An oil collecting groove 4 is provided on the outer peripheral surface of the ring body at the inlet of each oil and gas channel 1. The oil collecting groove 4 includes a first oil collecting groove 41 and a second oil collecting groove 42. The first oil collecting groove 41 is arranged at the inlet of the left oil and gas channel 11, and the second oil collecting groove 42 is arranged at the inlet of the right oil and gas channel 12. The oil inlet channel on the main shaft is connected to the oil collecting groove 4, which can give the lubricating oil in the oil injection channel a greater pressure.

[0034] On the basis of the above embodiment, the oil collecting groove 4 can be a cylindrical groove or a conical groove opened on the ring body of the bearing spacer. In a preferred embodiment, the bottom of the oil collecting groove 4 is perpendicular to the oil and gas channel 1, and the groove wall of the oil collecting groove 4 is parallel to the end face of the bearing spacer, which can ensure that the spray hole 2 has a relatively high pressure when spraying oil and gas outward.

[0035] When the bearing spacer of the present invention is used, the circular sealing groove 3 and the strip sealing groove 33 provided on the outer peripheral surface of the ring body are both provided with sealing members, and the circular sealing groove 3 includes a first circular sealing groove 31 and a second circular sealing groove 32 provided on both sides of the oil injection channel in the axial direction. In one embodiment, two circular sealing rings 5 ​​and two sealing strips 6 can be provided on the bearing spacer, and each part is provided separately. In a preferred embodiment, the sealing member provided on the bearing spacer is an integral sealing member, so that the overall sealing effect of the bearing spacer is better.

[0036] Based on the above embodiment, the integral sealing member includes a pair of circular sealing rings 5 ​​and at least two sealing strips 6 connecting the two circular sealing rings in the pair, such as Figure 4 As shown, the shape of the integral seal is consistent with the shape of the sealing groove opened on the outer peripheral surface of the bearing spacer, and the cross-sectional shape of the integral seal is circular, and the material thereof is rubber.

[0037] The bearing spacer of the present invention is used on an electric spindle, such as Figure 5The electric spindle shown in the figure comprises a rotating shaft 7, a housing 10, a front cover 28, a rear cover 30, a stator assembly 13, a rotor assembly 14 and bearings. The bearings comprise a front bearing 8 and a rear bearing 16. The front bearing spacer 9 on the outer ring of the front bearing 8 and the rear bearing spacer 15 on the outer ring of the rear bearing 16 both use the bearing spacers of the present invention. The seals used thereon are all the integral seals of the present invention. The rear cover of the electric spindle is provided with a front bearing left oil inlet 23, a rear bearing left oil inlet 24, and a rear bearing The right oil inlet 25 and the right oil inlet 26 of the front bearing, the front bearing oil inlet passage 17 is divided into the left oil inlet passage of the front bearing and the right oil inlet passage of the front bearing, the front bearing oil inlet passage 17 includes an oil inlet passage opened in the axial direction of the rear cover 30 and connected to the left oil inlet 23 of the front bearing and the right oil inlet 26 of the front bearing, an oil inlet passage opened on the housing 10 and extending axially to the front cover 28, and an oil inlet passage on the front cover 28 extending radially toward the rotating shaft 7 and passing through the front bearing seat 29, and finally The rear bearing oil inlet passage 18 is connected to the oil collecting groove on the front bearing spacer 9, and the rear bearing oil inlet passage 18 includes an oil inlet passage connected to the left oil inlet port 24 and the right oil inlet port 25 of the rear bearing axially opened in the rear cover 30. The rear bearing seat 34 is axially floatingly installed in the housing 10, and a spring baffle is connected to the rear end. A floating spring for pushing the rear bearing seat backward is provided between the spring baffle and the housing 10. An oil nozzle 27 for compensating floating is also provided between the rear cover 30 and the spring baffle. The lubricating oil entering the rear bearing oil inlet port enters the oil inlet passage axially opened on the rear bearing seat 34 through the oil nozzle, and is connected to the oil collecting groove on the rear bearing spacer 15 through the oil inlet passage extending radially toward the rotating shaft 7 on the rear bearing seat 34 at the rear bearing spacer 15. In this way, independent oil inlet passages are formed, and the independent oil inlet passages supply oil to the front bearing 8 and the rear bearing 16 respectively. The oil inlet passages on the left and right sides of the same bearing are also independent of each other, ensuring that one oil inlet passage only supplies oil to one side of a bearing.

[0038] In this way, the axial size of the electric spindle will not increase, and it has a more effective sealing effect, which can effectively prevent the oil and gas between different oil circuits from interfering with each other and causing the lubrication effect to decrease, thereby ensuring the working performance and service life of the bearing.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A bearing spacer, characterized in that: It includes a ring body, in which an oil injection channel is opened. The oil injection channels are arranged at intervals in the circumferential direction and are divided into a left oil injection channel and a right oil injection channel. A sealing groove is also opened on the outer circumferential surface of the bearing spacer, and the sealing groove includes a circular sealing groove arranged on both sides of the axial direction of the oil injection channel and a strip sealing groove connecting the circular sealing grooves. In the circumferential direction, the strip sealing groove is arranged between the left oil injection channel and the right oil injection channel.

2. The bearing spacer according to claim 1, characterized in that: The ring body is divided into two areas in the circumferential direction, and the left-side oil injection channel and the right-side oil injection channel are respectively located in the two areas.

3. The bearing spacer according to claim 2, characterized in that: There is one left fuel injection channel and one right fuel injection channel, and the two are 90 degrees apart in the circumferential direction. There are two strip sealing grooves, and they are respectively located in the circumferential middle position of the left fuel injection channel and the right fuel injection channel.

4. The bearing spacer according to claim 3, characterized in that: The strip sealing groove is a linear sealing groove extending in the axial direction.

5. The bearing spacer according to any one of claims 1 to 4, characterized in that: The oil injection channel includes an oil and gas channel extending in the radial direction and a spray hole extending obliquely from the inner end of the oil and gas channel to one end of the ring body. The oil and gas channels of each oil injection channel are located on the same plane perpendicular to the axis.

6. The bearing spacer according to any one of claims 1 to 4, characterized in that: The oil injection channel includes an oil and gas channel extending in the radial direction and a spray hole extending obliquely from the inner end of the oil and gas channel to one end of the ring body. An oil collecting groove is arranged on the outer peripheral surface of the ring body at the inlet of each oil and gas channel.

7. The bearing spacer according to claim 6, characterized in that The bottom of the oil collecting groove is perpendicular to the oil and gas channel, and the groove wall of the oil collecting groove is parallel to the end surface of the bearing spacer.

8. A sealing member, characterized in that: The invention comprises a pair of circular sealing rings and at least two sealing strips connecting the two paired circular sealing rings, and the sealing component is an integral sealing component.

9. The seal according to claim 8, characterized in that The sealing strip is a sealing strip extending in the axial direction.

10. The seal according to claim 9, characterized in that There are two sealing strips, which are symmetrically arranged in the circumferential direction.

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