Ball return end cover and linear motor thereof

Abstract

The present invention relates to a ball return end cover and a linear motor thereof. The ball return end cover comprises an end cover main body, the end cover main body being provided with a ball return channel, and the ball return path being provided with a first return port and a second return port; the end cover main body is provided with an oil passage connected to the outside, and the oil passage is connected to the ball return channel. The end cover main body is provided with the ball return channel, and by means of the ball return channel, a ball can enter / exit via the first return port and exit / enter via the second return port. Moreover, the oil passage is provided on the end cover main body and connected to the ball return channel, and lubricating oil can directly lubricate the interior of a ball circulationon sliding rail on a mover, thus achieving better lubricating effect on the ball. In addition, the lubricating oil can achieve better lubricating effect on the ball return channel, such that the ball return end cover can be smoother during ball return. Compared with the prior art, the ball return end cover and the linear motor thereof disclosed by the present application can achieve the purposes of lubricating interiors of ball circulation sliding rails and improving the lubricating effect.

Description

A ball return end cover and a linear motor thereof Technical Field

[0001] The present invention relates to the technical field of travel drive devices, and in particular to a ball return end cover and a linear motor thereof. Background Art

[0002] A linear motor is a transmission device that converts electrical energy directly into linear motion without any intermediate conversion mechanism. It can be thought of as a rotary motor cut radially and flattened into a flat surface. Linear motors are also known as linear motors, linear motors, linear motors, and push rod motors. The most commonly used types of linear motors are flat plate, U-slot, and tubular.

[0003] The ball return end cover is a structure used to rotate the balls in the ball linear motor. The setting of the ball return end cover can make the balls rotate and circulate in the ball circulation slide rail in the mover.

[0004] During operation, linear motors require timely lubrication of the stator rails or the ball recirculation rails on the movers to maintain smooth movement. Conventional linear motors often require a separate lubrication mechanism, but this external lubrication mechanism has difficulty lubricating the interior of the ball recirculation rails, resulting in poor lubrication.

[0005] Summary of the Invention

[0006] In order to solve the defect that the lubrication mechanism is difficult to lubricate the inside of the ball circulation slide, resulting in poor lubrication effect, the present invention proposes a ball return end cover and a linear motor thereof.

[0007] The technical solution adopted by the present invention is a ball return end cover, including an end cover body, the end cover body is provided with a ball return channel, the ball return channel has a first return port and a second return port, the end cover body is provided with an oil channel connected to the outside, and the oil channel and the ball return channel are connected.

[0008] Preferably, the oil passage is connected to the position of the first return port.

[0009] Preferably, the oil passage is a groove formed on the surface of the end cover body and extending to the first return port, and the groove is configured to be sealed with the external structure to form the oil passage.

[0010] Preferably, the first return port protrudes outward away from the end cover body to form a mounting portion.

[0011] Preferably, the mounting portion is provided with a notch, and the oil passage is connected to the notch.

[0012] Preferably, at least two ball return channels are provided, and the multiple ball return channels are all connected to the oil channel.

[0013] Preferably, the ball-returning channel is provided with a groove structure that is recessed inward away from the ball-returning channel, and the groove structure is arranged along the ball-returning path direction of the ball-returning channel.

[0014] Preferably, the end cover body includes an end cover plate and a ball return plate, and the end cover plate and the ball return plate together form a ball return channel.

[0015] Preferably, one of the end cover plate and the ball return plate is provided with a groove structure recessed inward away from the ball return channel at the joint position of the two, and the groove structure is arranged along the ball return path direction of the ball return channel.

[0016] Preferably, the end cover body has a first oil inlet, the end cover body is connected to an oil box, and the oil box, the first oil inlet and the oil channel are connected in sequence.

[0017] The present invention also proposes a linear motor, comprising a stator slide rail and a mover slidingly fitted on the stator slide rail, and comprising the above-mentioned ball return end cover, wherein the ball return end cover is connected to the mover.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present application discloses a ball return end cover, including an end cover body, the end cover body is provided with a ball return channel, the ball return channel has a first return port and a second return port, the end cover body is provided with an oil channel connected to the outside, and the oil channel is connected to the ball return channel. The end cover body is provided with a ball return channel, through which balls can enter / leave from the first return port and leave / enter from the second return port. In addition, by arranging the oil channel on the end cover body and connecting it to the ball return channel, the lubricating oil can directly lubricate the inside of the ball circulation slide rail on the mover, which has a good lubricating effect on the balls; at the same time, the lubricating oil can also have a good lubricating effect on the ball return channel, so that the ball return end cover is smoother when returning the balls.

[0020] This application also discloses a linear motor comprising a stator rail and a mover slidably engaged with the stator rail, including the aforementioned ball return end cap, which is connected to the mover. By incorporating the disclosed ball return end cap, the linear motor can achieve improved lubrication, better ball return, higher precision, smaller size, and a more compact structure.

[0021] Compared with the prior art, the ball return end cover and the linear motor disclosed in the present application can achieve the purpose of lubricating the inside of the ball circulation slide rail and improving the lubrication effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention is described in detail below with reference to the embodiments and accompanying drawings, in which:

[0023] FIG1 shows a schematic structural diagram of a ball return end cover provided in an embodiment of the present invention;

[0024] FIG2 shows a schematic structural diagram of a ball return end cover according to FIG1 in another direction;

[0025] FIG3 shows a schematic structural diagram of a ball return plate in a ball return end cover according to FIG1 ;

[0026] FIG4 shows a schematic structural diagram of the ball return plate in the ball return end cover according to FIG3 in another direction;

[0027] FIG5 shows a schematic structural diagram of an end cover plate in a ball return end cover according to FIG1 ;

[0028] FIG6 shows a schematic structural diagram of a stator in a linear motor according to an embodiment of the present invention.

[0029] Description of labels:

[0030] 10. End cover body; 11. End cover plate; 12. Ball return plate; 13. Groove structure; 14. Second limiting portion;

[0031] 20. Ball return channel; 21. First return port; 22. Second return port;

[0032] 30. Oil channel; 31. First oil inlet; 32. Second oil inlet; 33. Connecting port;

[0033] 40. Mounting portion; 41. Notch; 42. First limiting portion;

[0034] 50. Mover; 51. Mounting fitting. DETAILED DESCRIPTION

[0035] To make the objectives, technical solutions, and advantages of the present invention more apparent, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. Examples of embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar components or components having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0036] The present invention discloses a ball return end cover, please refer to Figures 1 to 6, which includes an end cover body 10, and the end cover body 10 is provided with a ball return channel 20, and the ball return channel 20 has a first return port 21 and a second return port 22. The end cover body 10 is provided with an oil channel 30 connected to the outside, and the oil channel 30 is connected to the ball return channel 20.

[0037] The end cap body 10 is provided with a ball return channel 20, through which balls can enter and exit through the first return port 21 and exit and enter through the second return port 22. Furthermore, by providing an oil passage 30 on the end cap body 10 and connecting it to the ball return channel 20, lubricating oil can directly lubricate the interior of the ball circulation rail on the mover 50, effectively lubricating the balls. Simultaneously, the lubricating oil also effectively lubricates the ball return channel 20, making the ball return of the ball return end cap smoother.

[0038] It should be noted that the ball return end cap is the component that is in closest contact with the ball, compared to other components on the mover 50. Its contact area with the ball is larger, and the rotational motion of the ball in the ball return end cap is richer than that generated in other locations. Therefore, providing the oil passage 30 on the ball return end cap can better lubricate the ball. Furthermore, precisely because the ball return end cap is in closest contact with the ball, the ball is very likely to become stuck in the ball return end cap. Therefore, by providing the oil passage 30 on the ball return end cap and connecting it to the ball return channel 20, the ball return channel 20 can be effectively lubricated, making the ball return of the ball return end cap smoother.

[0039] It should also be noted that since the oil passage 30 is provided on the end cap body 10, the need for an additional lubrication structure to be provided with the oil passage 30 is eliminated. This allows the end cap body 10 to perform a lubrication function in addition to the conventional function of the rotating ball bearing. Furthermore, since the present application avoids the need for an additional lubrication structure, the disclosed ball-returning end cap can be reduced in size, making the overall structure more compact.

[0040] Specifically, this embodiment does not limit the specific location of the oil passage 30 in the ball return channel 20. The oil passage 30 can be connected to the middle of the ball return channel 20, or to either side of the middle of the ball return channel 20. Of course, it can also be connected to the first return port 21 or the second return port 22, thereby achieving lubrication of the balls and the ball return channel 20. Since the balls carry lubricating oil, when the balls move to other positions, they can also provide lubrication to these positions.

[0041] Among them, this application does not limit the shape of the end cover body 10, and the shape of the end cover body 10 in the drawings of this application is only one embodiment of this application. In other embodiments, the shape of the end cover body 10 can be a centrally symmetrical figure, so that both sides of the end cover body 10 can be connected to other structures such as the mover 50. In addition, in other embodiments, the first return port 21 and the second return port 22 are of the same shape and size, and the positions of the settings are symmetrical relative to the center of the end cover body 10, so that the operator can choose which of the first return port 21 and the second return port 22 is closer to the stator slide rail, or choose the upper and lower positions of the first return port 21 and the second return port 22. It should also be noted that there is at least one ball return channel 20, and the number of first return ports 21 and the number of second return ports 22 match the number of ball return channels 20.

[0042] Furthermore, the oil passage 30 can be disposed within the end cap body 10 and can be slotted to seal against the external structure, thereby forming the oil passage 30. Alternatively, the oil passage 30 can be disposed within the end cap body 10 at one section and slotted at another section. In some embodiments, when the oil passage 30 transitions from a channel disposed within the end cap body 10 to a slotted configuration, the channel 30 is connected via the connecting port 33, and the lubricating oil flows sequentially through the internal channel, the connecting port 33, and the slots to the ball return passage 20.

[0043] Specifically, the oil passage 30 can be connected to the outside by an external pipeline at the location where it is connected to the outside, through which lubricating oil enters the oil passage 30. Alternatively, an oil box can be provided at the location where it is connected to the outside, storing lubricating oil that can flow into the oil passage 30, thereby achieving lubrication. In other embodiments, the oil passage 30 can be provided with an oil reservoir material for storing lubricating oil. During the movement of the mover 50, the lubricating oil in the oil reservoir material can be applied to the ball bearings for lubrication. When the lubricating oil in the oil reservoir material is exhausted, it is necessary to replenish the lubricating oil at the location where it is connected to the outside. Obviously, other structures can also be used to allow lubricating oil to enter the oil passage 30 from the outside.

[0044] In some embodiments, referring to FIG. 1 to FIG. 5 , the oil passage 30 is connected to the first return port 21 .

[0045] Specifically, the oil passage 30 connects to the first return port 21. Of the two return ports in this embodiment, the one connected to the oil passage 30 is the first return port 21, and the other is the second return port 22. By placing the oil passage 30 at the first return port 21, the balls within the ball return channel 20 have more opportunities for lubrication, allowing them to be lubricated from the moment they enter the ball return channel 20, resulting in a more effective lubrication. It should be noted that the mover 50 can move back and forth on the stator rail, so the balls always have the opportunity to enter through the first return port 21 and exit through the second return port 22.

[0046] The first direction port can be located in a slot formed in the first return port 21, or a through hole formed on the sidewall of the first return port 21 and connected to the oil passage 30, or a lubricating ring formed around the first return port 21, thereby connecting the oil passage 30 to the first return port 21. It should be noted that the location of the first return port 21 or the second return port 22 refers to a portion of the area near the ball inlet and outlet, not just the location of the ball inlet and outlet.

[0047] In some embodiments, please refer to Figures 1 to 5. The first return port 21 and the second return port 22 are arranged horizontally, the first return port 21 is set away from the stator slide rail, and the second return port 22 is set close to the stator slide rail, so that the ball can immediately slide in contact with the stator slide rail after being lubricated with lubricating oil. On the one hand, more lubricating oil can be carried to the stator slide rail, and on the other hand, the ball is fully lubricated in the ball return channel 20. From the above two aspects, the ball return end cover can have a better lubrication effect on the linear motor, and the ball return process of the ball return end cover is smoother, thereby improving the operating accuracy of the linear motor.

[0048] In other embodiments, the first return port 21 and the second return port 22 are arranged horizontally, the first return port 21 is set close to the stator slide rail, and the second return port 22 is set away from the stator slide rail, so that the ball contacts the stator slide rail immediately after being lubricated at the first return port 21, so that the stator slide rail can obtain more lubricating oil. In this embodiment, the stator slide rail can be evenly lubricated.

[0049] When the balls are lubricated, each ball is evenly lubricated without uneven lubrication. Therefore, when the balls come into contact with the stator rails, the stator rails can also be lubricated more evenly.

[0050] In some specific embodiments, referring to FIG. 1 to FIG. 5 , the oil passage 30 is a groove formed on the surface of the end cover body 10 and extending to the first return port 21 . The groove is configured to seal with an external structure to form the oil passage 30 .

[0051] Specifically, the oil passage 30 is a slot formed on the surface of the end cap and extending to the first return port 21. The slot can be combined with the external structure to seal and form the oil passage 30. The slot design can, on the one hand, reduce the difficulty of machining the oil passage 30 on the end cap body 10 and reduce the number of steps involved in machining. This is especially true for branches of the oil passage 30, as machining the branch oil passage is more complex. On the other hand, the slot design can make it easier for operators to clean up oil stains. For some linear motor return ball end caps that are not frequently used, if lubricating oil accumulates in the oil passage 30 for too long, it may cause blockage of the oil passage 30. The slot design can greatly facilitate cleaning operations for operators.

[0052] In addition, due to the open structure of the slot, if the operator needs to control the flow of the lubricating oil, he can easily add a flow control structure in the slot, such as an additional gasket, to control the output of the lubricating oil by changing the cross-sectional area of ​​the oil channel 30.

[0053] Since the grooves are provided on the surface of the end cover body 10 , the structural strength of the end cover body 10 can be made higher and the end cover body 10 is less prone to deformation and damage.

[0054] In some specific embodiments, referring to FIG. 1 to FIG. 3 , the first return opening 21 protrudes outward away from the end cover body 10 to form a mounting portion 40 .

[0055] Specifically, the first return port 21 protrudes outward from the end cap body 10 to form a mounting portion 40. The provision of the mounting portion 40 facilitates installation with the mover 50, simplifying the assembly process while also serving as a position limiter. Furthermore, the provision of the mounting portion 40 enhances the sealing performance between the ball return end cap and the mover 50, preventing lubricating oil from leaking.

[0056] Preferably, a first limiting portion 42 is further provided at the mounting portion 40. The first limiting portion 42 can prevent the mounting portion 40 from rotating when mounted on the mover 50, thereby improving the installation accuracy of the ball return end cover.

[0057] In some embodiments, referring to Figure 2, the end cap body 10 is provided with a second stopper 14, which allows for a tighter fit between the ball return end cap and other structures. Preferably, the second stopper 14 is two bumps, which can be integrally formed with the ball return end cap.

[0058] Preferably, a mounting fitting portion 51 may be provided on the mover 50, and the mounting portion 40 and the mounting fitting portion 51 can cooperate with each other, so that the sealing effect is better and the connection and fixing effect of the ball return end cover is better.

[0059] In other embodiments, a mounting portion 40 protruding outward away from the end cover body 10 may also be provided at the second return opening 22 .

[0060] In some embodiments, the end cover body 10 has a through hole, and an operator can use bolts to fix the end cover body 10 and the mover 50 .

[0061] In some more specific embodiments, referring to FIG. 1 , FIG. 3 and FIG. 4 , the mounting portion 40 is provided with a notch 41 , and the oil passage 30 is communicated with the notch 41 .

[0062] Furthermore, the mounting portion 40 is provided with a notch 41, and the oil passage 30 is connected to the notch 41. Providing an opening in the mounting portion 40 avoids the need for a hole to be located elsewhere in the first return port 21. It should be noted that during the ball return cycle, the rotating ball will exert a certain degree of impact force on the ball return end cap, particularly at the location where the ball changes direction, i.e., the rotation of the ball return passage 20. Therefore, providing the hole connected to the oil passage 30 in the notch 41 of the mounting portion 40 can prevent damage from the impact force of the ball, thereby enhancing the structural strength and thereby extending the service life of the ball return end cap.

[0063] In some embodiments, referring to FIG. 1 to FIG. 5 , at least two ball return channels 20 are provided, and the plurality of ball return channels 20 are all connected to the oil channel 30 .

[0064] Specifically, the stability of the mover 50 during operation is higher when at least two ball return channels 20 are provided compared to when a single ball return channel 20 is provided. However, it should be noted that the number of ball return channels 20 is limited by the manufacturing cost and the size of the mover 50. Therefore, the number of ball return channels 20 needs to be selected according to specific needs.

[0065] The plurality of ball return channels 20 are all connected to the oil channel 30 , so that each ball return channel 20 can be lubricated by the lubricating oil.

[0066] Preferably, referring to Figures 1 and 3 , the oil passage 30 includes a main oil passage and at least two branch oil passages. One end of the main oil passage is connected to the outside, and the other end is connected to multiple branch oil passages. This allows lubricating oil to be added from a single location within the main oil passage. In other embodiments, the branch oil passages can also be connected to one another to achieve flow control.

[0067] In other embodiments, there may be multiple oil passages 30 , which are respectively connected to multiple ball return passages 20 , or multiple oil passages 30 are connected to different positions in one ball return passage 20 .

[0068] In some embodiments, referring to FIG. 1 , FIG. 3 and FIG. 4 , the ball return channel 20 is provided with a groove structure 13 that is recessed inward away from the ball return channel 20 , and the groove structure 13 is provided along the ball return path direction of the ball return channel 20 .

[0069] It should be noted that by providing the ball return channel 20 with a recessed groove structure 13 that is recessed inwardly away from the ball return channel 20 and arranged along the ball return path of the ball return channel 20, the groove structure 13 can play a certain guiding role for the balls, and to a certain extent can share some of the pressure concentrated on the walls of the ball return channel 20, thereby making the ball return effect of the ball return end cap better. Preferably, the groove structure 13 is provided at the bottom and / or top of the ball return channel 20. Due to the self-weight of the balls, the placement of the groove structure 13 at the bottom and / or top of the ball return channel 20 can further improve the ball return effect.

[0070] It should be explained that the size of the groove structure 13 relative to the ball return channel 20 cannot be too large, otherwise when most of the ball is sunk into the groove structure 13, a better ball return effect cannot be achieved.

[0071] Preferably, referring to Figures 1, 3, and 4, the groove structure 13 is a chamfered structure. Compared to the groove structure 13, the chamfered structure has a smoother contact surface with the ball, and has higher structural strength and is less prone to damage. Specifically, the angle range of the chamfered structure is 10° to 80° (the normal chamfer angle range is 0° to 90°).

[0072] In some embodiments, referring to FIG. 1 to FIG. 5 , the end cover body 10 includes an end cover plate 11 and a ball return plate 12 , and the end cover plate 11 and the ball return plate 12 together form a ball return channel 20 .

[0073] During the movement of the mover 50, the impact force of the ball is mainly concentrated on the rear end of the end cover body 10, so the end cover plate 11 is more susceptible to damage than the ball return plate 12. Therefore, by separating the end cover body 10 into the end cover plate 11 and the ball return plate 12, the purpose of facilitating the replacement of wearing parts can be achieved.

[0074] In some specific embodiments, please refer to Figures 1 to 5. One of the end cover plate 11 and the ball return plate 12 is provided with a groove structure 13 at the joint position of the two, which is recessed inward away from the ball return channel 20. The groove structure 13 is arranged along the ball return path direction of the ball return channel 20.

[0075] Specifically, if the end cap body 10 is integrally formed, it would be more difficult to create the groove structure 13. However, the independent configuration of the end cap plate 11 and the ball return plate 12 facilitates the processing and creation of the groove structure 13. Furthermore, to make the groove structure 13 easier to create, the groove structure 13 is located at the junction of one of the end cap plate 11 and the ball return plate 12, that is, at the edge of the end cap plate 11 or the ball return plate 12.

[0076] Preferably, the groove structure 13 is a chamfered structure. Compared to the groove structure 13, the chamfered structure has a smoother contact surface with the ball, has higher structural strength, and is less prone to damage. Specifically, the angle range of the chamfered structure is 10° to 80° (the angle range of the normal chamfer is 0° to 90°).

[0077] In some embodiments, referring to Figures 1, 2, 5 and 6, the end cover body 10 has a first oil inlet 31, the end cover body 10 is connected to an oil box, and the oil box, the first oil inlet 31 and the oil channel 30 are connected in sequence.

[0078] It should be noted that a first oil inlet 31 is provided on the end cover body 10, and the first oil inlet 31 can be integrated with the external oil box, and can realize the lubrication function by itself without the need for other external components, which is conducive to reducing the size of the mover 50 and making the overall structure more compact.

[0079] Preferably, please refer to Figures 1, 2, 5 and 6. The end cover body 10 also has a second oil inlet 32, which can be connected to an external pipeline for adding lubricating oil. The end cover body 10 is provided with a first oil inlet 31 and a second oil inlet 32, which can be selected according to the specific usage requirements of the user, thereby improving the adaptability of the ball return end cover.

[0080] The present application also discloses a linear motor, please refer to Figure 6, which includes a stator slide rail and a mover 50 slidingly fitted on the stator slide rail, including the above-mentioned ball return end cover, and the ball return end cover is connected to the mover 50.

[0081] By being equipped with the ball return end cover disclosed in this application, the linear motor can achieve better lubrication effect, better ball return effect, higher precision, smaller size and more compact structure.

[0082] In this specification, the use of terms such as "Embodiment 1," "this embodiment," and "in one embodiment" indicates that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in the invention or at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example; furthermore, the specific features, structures, materials, or characteristics described may be appropriately combined in any one or more embodiments or examples.

[0083] In the description of this specification, the terms "connect," "install," "fix," "dispose," and "have" are to be understood in a broad sense. For example, "connect" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0084] In the description of this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising the element.

[0085] The above description of the embodiments is to facilitate ordinary technicians in this technical field to understand and apply the technology of this case. People familiar with the technology in this field can obviously make various modifications to these examples easily and apply the general principles described here to other embodiments without having to go through creative work. Therefore, this case is not limited to the above embodiments. Modifications to the following situations should all be within the scope of protection of this case: ① A new technical solution implemented based on the technical solution of the present invention and combined with existing common knowledge, the technical effect produced by the new technical solution does not exceed the technical effect of the present invention; ② The equivalent replacement of some features of the technical solution of the present invention with the known technology, the technical effect produced is the same as the technical effect of the present invention; ③ The technical solution of the present invention is expandable, and the substantive content of the expanded technical solution does not exceed the technical solution of the present invention; ④ The equivalent transformation made by the content of the description and drawings of the present invention is directly or indirectly applied to other related technical fields.

Claims

1. A ball return end cap, characterized in that: The end cover body comprises an end cover body provided with a ball return channel having a first return port and a second return port; the end cover body is provided with an oil channel communicating with the outside, and the oil channel is communicated with the ball return channel.

2. A ball return end cap according to claim 1, characterized in that: The oil passage is connected to the first return port.

3. A ball return end cap according to claim 2, characterized in that: The oil passage is a groove opened on the surface of the end cover body and extending to the first return port. The groove is configured to be sealed with an external structure to form the oil passage.

4. The ball return end cap according to claim 2, characterized in that: The first return port protrudes outward away from the end cover body to form a mounting portion.

5. The ball return end cover according to claim 4, characterized in that: The mounting portion is provided with a notch, and the oil passage is communicated with the notch.

6. The ball return end cap according to claim 1, characterized in that: At least two ball return channels are provided, and the plurality of ball return channels are all connected to the oil channel.

7. The ball return end cap according to claim 1, characterized in that: The ball-returning channel is provided with a groove structure which is recessed inward away from the ball-returning channel, and the groove structure is arranged along the ball-returning path direction of the ball-returning channel.

8. The ball return end cap according to claim 1, characterized in that: The end cover body includes an end cover plate and a ball return plate, and the end cover plate and the ball return plate together form the ball return channel.

9. The ball return end cap according to claim 8, characterized in that: One of the end cover plate and the ball return plate is provided with a groove structure recessed inward away from the ball return channel at a joint position between the two, and the groove structure is arranged along the ball return path direction of the ball return channel.

10. The ball return end cap according to claim 1, characterized in that: The end cover body has a first oil inlet, and the end cover body is connected to an oil box. The oil box, the first oil inlet and the oil channel are connected in sequence.

11. A linear motor comprising a stator slide rail and a mover slidingly engaged with the stator slide rail, characterized in that: It comprises a ball return end cover according to any one of claims 1 to 9, wherein the ball return end cover is connected to the mover.

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