Sliding block assembly and linear rail device
By designing a slider assembly with step elimination part, the problems of unsmooth operation, high assembly accuracy and easy damage of the motion guide device are solved, and higher component life, smooth operation and cost savings are achieved.
Patent Information
- Application Number
- CN202422063191.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-23
- Publication Date
- 2025-05-16
- Estimated Expiration
- 2034-08-23
AI Technical Summary
The motion guide device has problems such as insufficient smoothness, high assembly accuracy requirements, and easy damage during operation.
A slider assembly is designed, including a slider, a return device and a step elimination section for cooperating with the linear track of the linear track device to form a load channel, a return channel and a return channel, forming a circulation channel to accommodate the ball, and reducing impact wear of the ball through the step elimination section.
It improves the life of the slider assembly, avoids the phenomenon of ball stuck, ensures the smooth operation of the linear track device, and reduces the requirements for machining accuracy and assembly accuracy, thereby saving costs.
Smart Images
Figure CN222880130U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the technical field of motion guide equipment, and in particular to a slider assembly and a linear track device. Background Art
[0002] Motion guide devices are widely used in various precision mechanical equipment to ensure that the worktable or other moving parts move smoothly and accurately along the predetermined channel. The motion guide device uses rolling elements (such as balls) to circulate in the circulation channel of the slider and the track to achieve smooth movement of the slider, thereby driving other moving parts to move.
[0003] However, motion guide devices usually have problems such as not running smoothly enough, requiring high assembly precision, and being easy to damage. Utility Model Content
[0004] The embodiments of the present disclosure provide a slider assembly and a linear track device using the slider assembly.
[0005] In a first aspect, an embodiment of the present disclosure provides a slider assembly for a linear track device, the slider assembly comprising a slider and a return device respectively arranged at both ends of the slider; the slider is provided with a first load channel extending along a first direction, for cooperating with a second load channel arranged on a linear track of the linear track device to form a load channel; the slider is also provided with a return channel extending along the first direction; the return device comprises an inner portion and an outer portion, the inner portion is provided with a first return channel, the outer portion is provided with a second return channel, the first return channel cooperates with the second return channel to form a return channel; the The load channel, the return channel, and the return channel constitute a circulation channel for accommodating a plurality of balls and allowing the balls to roll in the circulation channel; the first return channel is connected to the first load channel; a step elimination portion is provided at the connection between the first return channel and the first load channel; the step elimination portion includes a first contour line close to one end of the first return channel and a second contour line close to one end of the first load channel; on a cross section perpendicular to the first direction, a projection of a contour line of one end of the first return channel close to the step elimination portion is located between a projection of the first contour line and a projection of the second contour line.
[0006] In some embodiments, the step eliminating portion includes a chamfer disposed at one end of the first load channel close to the first return channel; and the radius of the first contour line is greater than the radius of the second contour line.
[0007] In some embodiments, at the connection, the distance from the reference line to the first return channel and the diameter of the ball satisfy:
[0008] 0.51Dw≤r;
[0009] Wherein, Dw represents the diameter of the ball; r represents the distance from the reference line to the first return channel; the reference line is a straight line extending along the first direction where the center of the ball is located when the ball contacts the first load channel.
[0010] In some embodiments, at the connection, the distance from the reference line to the first return channel and the diameter of the ball satisfy:
[0011] r≤0.5Dw+a;
[0012] Wherein, Dw represents the diameter of the ball; r represents the distance from the reference line to the first return channel; a represents the length of the step elimination portion extending in the first direction; the reference line is a straight line extending along the first direction where the center of the ball is located when the ball contacts the first load channel.
[0013] In some embodiments, the value of a ranges from 0.15 to 0.3 mm.
[0014] In a second aspect, an embodiment of the present disclosure provides a linear track device, which includes a linear track, a slider assembly, and a plurality of ball bearings; the linear track extends along a first direction; the slider assembly includes a slider and a return device respectively arranged at both ends of the slider; the slider is provided with a first load channel extending along the first direction; the first load channel cooperates with a second load channel arranged on the linear track to form a load channel; the slider is also provided with a return channel extending along the first direction; the return device includes an inner side portion and an outer side portion, the inner side portion is provided with a first return channel, the outer side portion is provided with a second return channel, the first return channel cooperates with the second return channel, The load channel, the return channel and the return channel form a circulation channel; a plurality of the balls are arranged in the circulation channel and can roll in the circulation channel; the first return channel is connected to the first load channel; a step elimination portion is provided at the connection between the first return channel and the first load channel; the step elimination portion includes a first contour line close to one end of the first return channel and a second contour line close to one end of the first load channel; on a cross section perpendicular to the first direction, a projection of a contour line of one end of the first return channel close to the step elimination portion is located between a projection of the first contour line and a projection of the second contour line.
[0015] In some embodiments, the step eliminating portion includes a chamfer disposed at one end of the first load channel close to the first return channel; and the radius of the first contour line is greater than the radius of the second contour line.
[0016] In some embodiments, at the connection, the distance from the reference line to the first return channel and the diameter of the ball satisfy:
[0017] 0.51Dw≤r;
[0018] Wherein, Dw represents the diameter of the ball; r represents the distance from the reference line to the first return channel; and the reference line is a straight line where the centers of the balls arranged on the first load channel are located.
[0019] In some embodiments, at the connection, the distance from the reference line to the first return channel and the diameter of the ball satisfy:
[0020] r≤0.5Dw+a;
[0021] Wherein, Dw represents the diameter of the ball; r represents the distance from the reference line to the first return channel; a represents the length of the step elimination portion extending in the first direction; and the reference line is a straight line where the centers of the balls arranged on the first load channel are located.
[0022] In some embodiments, the value of a ranges from 0.15 to 0.3 mm.
[0023] In the disclosed embodiment, a step eliminating portion is provided at the connection between the first return channel and the first load channel, which can reduce the impact wear of the ball and increase the life of the component; it can also avoid ball jamming, which is beneficial to ensure the smooth operation of the linear track device; on this basis, it can also appropriately reduce the requirements for processing accuracy and assembly accuracy, thereby saving costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 is a cross-sectional view of a slider assembly along one direction in an embodiment of the present disclosure;
[0025] Figure 2 is a cross-sectional view of a slider assembly along another direction in an embodiment of the present disclosure;
[0026] Figure 3 is a three-dimensional schematic diagram of a slider assembly in an embodiment of the present disclosure;
[0027] Figure 4 is a partial enlarged cross-sectional view of a step elimination portion in a slider assembly in an embodiment of the present disclosure;
[0028] Figure 5 yes Figure 4 A partial enlarged schematic diagram of the middle step elimination part;
[0029] Figure 6is a partially enlarged stereoscopic schematic diagram of a step elimination portion in a slider assembly in an embodiment of the present disclosure;
[0030] Figure 7 is a schematic projection diagram of the outline of the step elimination portion in the slider assembly in the embodiment of the present disclosure;
[0031] Figure 8 It is a three-dimensional schematic diagram of a linear track device without a step elimination portion;
[0032] Fig. 9 It is a partially enlarged three-dimensional schematic diagram of a linear track device without a step elimination portion;
[0033] Fig.10 It is a partially enlarged cross-sectional view of a linear track device without a step elimination portion;
[0034] Fig.11 It is a schematic projection diagram of a part of the contour line of a linear track device without a step elimination part;
[0035] Fig.12 is a three-dimensional schematic diagram of a linear track device in an embodiment of the present disclosure;
[0036] Fig.13 It is a cross-sectional view of a linear track device in an embodiment of the present disclosure. DETAILED DESCRIPTION
[0037] In order to enable those skilled in the art to better understand the technical solution of the present disclosure, the technical solution of the present disclosure is described in detail below with reference to the accompanying drawings.
[0038] Example embodiments will be described more fully below with reference to the accompanying drawings, but the example embodiments may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. On the contrary, the purpose of providing these embodiments is to make the present disclosure thorough and complete and to enable those skilled in the art to fully understand the scope of the present disclosure.
[0039] In the absence of conflict, the various embodiments of the present disclosure and the various features therein may be combined with each other.
[0040] As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.
[0041] The terms used herein are only used to describe specific embodiments and are not intended to limit the present disclosure. As used herein, the singular forms "a", "an" and "the" are also intended to include the plural forms, unless the context clearly indicates otherwise. It will also be understood that when the terms "comprising" and / or "made of" are used in this specification, the presence of the features, wholes, steps, operations, elements and / or components is specified, but the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or groups thereof is not excluded.
[0042] The embodiments described herein may be described with reference to plan views and / or cross-sectional views by means of idealized schematic diagrams of the present disclosure. Therefore, the example illustrations may be modified according to manufacturing techniques and / or tolerances. Therefore, the embodiments are not limited to the embodiments shown in the accompanying drawings, but include modifications of the configurations formed based on the manufacturing process. Therefore, the regions illustrated in the accompanying drawings have schematic properties, and the shapes of the regions shown in the figures illustrate the specific shapes of the regions of the elements, but are not intended to be limiting.
[0043] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art. It will also be understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted as having an idealized or overly formal meaning unless explicitly defined as such herein.
[0044] Figures 1 to 3 It is a structural schematic diagram of a slider assembly for a linear track device in an embodiment of the present disclosure. Figure 1 and Figure 2 is a cross-sectional view of the slider assembly, Figure 3 It is a three-dimensional schematic diagram of the slider assembly.
[0045] like Figures 1 to 3 As shown, the slider assembly includes a slider 1 and a return device 2 respectively arranged at both ends of the slider 1; the slider 1 is provided with a first load channel 11 extending along the first direction, which is used to cooperate with the second load channel provided on the linear track 3 of the linear track device to form a load channel 41; the slider 1 is also provided with a return channel 42 extending along the first direction. The first direction is consistent with the extension direction of the linear track 3. The return device 2 includes an inner part 21 and an outer part 22, the inner part 21 is provided with a first return channel 211, and the outer part 22 is provided with a second return channel, and the first return channel 211 cooperates with the second return channel to form a return channel 43; the load channel 41, the return channel 42, and the return channel 43 form a circulation channel, which is used to accommodate a plurality of balls 5 and enable the balls 5 to roll in the circulation channel, and the balls 5 are, for example, steel balls. The first return channel 211 is connected to the first load channel 11.
[0046] Figure 4 , Figure 5 , Figure 6 2 is an enlarged schematic diagram of the connection between the first return channel 211 and the first load channel 11. Figure 5 yes Figure 4 An enlarged schematic diagram of the step eliminating portion 6 in the middle dotted circle.
[0047] like Figure 4 , Figure 5 , Figure 6 As shown, a step-eliminating portion 6 is provided at the connection between the first return channel 211 and the first load channel 11 . The step-eliminating portion 6 includes a first contour line 61 close to the first return channel 211 and a second contour line 62 close to the first load channel 11 .
[0048] Figure 7 It is a schematic diagram of projections of the first contour line 61 , the second contour line 62 , and the contour line 211 a of the first return channel 211 close to one end of the step eliminating portion 6 on a reference plane, where the reference plane is a cross section perpendicular to the first direction.
[0049] like Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown, the projection of the contour line 211a of the first return channel 211 close to the step eliminating portion 6 on the cross section perpendicular to the first direction is located between the projection of the first contour line 61 and the projection of the second contour line 62 on the reference plane.
[0050] In the embodiment of the present disclosure, the step elimination portion 6 serves as a transition structure for guiding the ball 5 from the first return channel 211 to the first load channel 11, or from the first load channel 11 to the first return channel 211. The step elimination portion 6 can be an extension of the end of the first load channel 11, and is an integral structure with the first load channel 11; the step elimination portion 6 can also be an extension of the end of the first return channel 211 near the first load channel 11, and is an integral structure with the inner side portion 21 of the return device 2; the step elimination portion 6 can also be an independent component provided at the connection between the first return channel 211 and the first load channel 11. The embodiment of the present disclosure does not make any special limitation on this.
[0051] In the embodiment of the present disclosure, the step-eliminating portion 6 realizes a smooth transition between the first return channel 211 and the first load channel 11, and a surface of the step-eliminating portion 6 connecting the first return channel 211 and the first load channel 11 can be a plane or a curved surface. The embodiment of the present disclosure does not specifically limit this.
[0052] In the disclosed embodiment, the balls 5 are sucked into the first return channel 211 from the first load channel 11 , and are discharged from the first return channel 211 into the first load channel 11 .
[0053] As a comparison, Figure 8 , Fig. 9 , Fig.10 A schematic diagram of a slider assembly without a step elimination portion. Figure 8 It is a three-dimensional schematic diagram of the slider assembly and the linear track device. Fig. 9 , Fig.10 It is a partially enlarged schematic diagram of the connection between the return channel and the load channel in a slider assembly without a step elimination portion.
[0054] like Fig. 9 and Fig.10 As shown, due to errors in the processing and assembly of the slider assembly, there will be a step difference at the connection between the return channel and the load channel. For example, the return channel is lower than the load channel, or the load channel is lower than the return channel. In addition, the step difference is not stable and may change due to the relative displacement of the return device and the slider. The existence of the step difference causes the ball to move during suction and discharge, resulting in jamming and noise. It is impossible to guide the ball to roll stably and smoothly, resulting in the linear track device not moving smoothly enough and being unable to be used in high-speed scenarios. The impact of the ball on the step difference during suction or discharge may also cause wear and damage to the ball and other components. In order to control the step difference, it is necessary to improve the processing accuracy and assembly accuracy of the slider, return device, etc., which will lead to increased costs.
[0055] In the embodiments of the present disclosure, Figure 4 , Figure 5 , Figure 6 As shown, the position where the step-eliminating portion 6 is combined with the first return channel 211 is the combination point N, and the position where the step-eliminating portion 6 is combined with the first load channel 11 is the combination point M. During the suction process of the ball 5, due to the existence of the step-eliminating portion 6, and the projection of the contour line 211a of the first return channel 211 close to the step-eliminating portion 6 on the cross section perpendicular to the first direction, located between the projection of the first contour line 61 on the reference plane and the projection of the second contour line 62 on the reference plane, the ball 5 will not directly impact the combination point N; during the ejection process of the ball 5, due to the existence of the step-eliminating portion 6, the ball 5 will not directly impact the combination point M. By setting the step-eliminating portion 6, the impact wear of the ball 5 can be reduced and the life of the component can be increased; it can also avoid the occurrence of ball jamming, which is conducive to ensuring the smooth operation of the linear track device; on this basis, the requirements for processing accuracy and assembly accuracy can be appropriately reduced, thereby saving costs.
[0056] In some embodiments, Figure 4 , Figure 5 , Figure 6 As shown, the step eliminating portion 6 includes a chamfer provided at one end of the first load channel 11 close to the first return channel 211 ; the radius of the first contour line 61 is greater than the radius of the second contour line 62 .
[0057] In some embodiments, Figure 7 As shown, at the connection between the first load channel 11 and the first return channel 211, the distance from the reference line to the first return channel 211 and the diameter of the ball 5 satisfy:
[0058] 0.51Dw≤r;
[0059] Wherein, Dw represents the diameter of the ball 5; r represents the distance from the reference line to the first return channel 211; the reference line is a straight line extending along the first direction where the center of the ball 5 is located when the ball 5 contacts the first load channel 11. Figure 7 In the figure, the position of the reference line is indicated by the center o of the ball 5, and the distance from the reference line to the first return channel 211 at the connection is the distance from the center o of the ball 5 to the first return channel 211; the center of the first load channel 11 is c and the radius is R.
[0060] As a comparison, Fig.11 Yes Figures 8 to 10 The diagram is a schematic diagram of the projection of the contour lines of the return channel and the load channel in the slider assembly without the step elimination portion on the reference plane.
[0061] In such Figures 8 to 10 In the slider assembly without step elimination shown in the figure, in order to control the step difference between the return channel and the load channel, the radius R of the load channel is 1 (c 1 The center of the circle), the diameter of the steel ball Dw 1 、Steel ball center o 1 The distance to the return channel is r 1 , need to meet 0.5Dw 1 <r 1 <R 1 , R 1 Not more than 0.51Dw 1 , high requirements are placed on the processing and assembly accuracy of sliders and return devices.
[0062] In the embodiment disclosed herein, a step elimination portion 6 is provided at the connection between the first return channel 211 and the first load channel 11, and the projection of the contour line 211a of the first return channel 211 close to one end of the step elimination portion 6 on the cross section perpendicular to the first direction is located between the projection of the first contour line 61 on the reference plane and the projection of the second contour line 62 on the reference plane. The distance from the center of the ball 5 to the first return channel 211 and the diameter of the ball 5 satisfy 0.51Dw≤r, which enables the ball 5 to smoothly enter the first load channel 11 from the first return channel 211, or to smoothly enter the first return channel 211 from the first load channel 11, avoiding ball jamming or impact due to too small a space, so that the ball 5 can smoothly transition at the connection and be smoothly sucked in and discharged, and the ball 5 and other components will not be worn or damaged due to impact, which is conducive to extending the service life.
[0063] In the embodiment of the present disclosure, it is possible to set 0.51Dw≤r. Figures 8 to 10 The slider assembly without the step elimination portion shown has a larger range of variation of r, which relaxes the manufacturing tolerance and can appropriately reduce the requirements for processing accuracy and assembly accuracy, thereby saving costs.
[0064] In some embodiments, at the connection between the first load channel 11 and the first return channel 211, the distance from the reference line to the first return channel 211 and the diameter of the ball 5 satisfy:
[0065] r≤0.5Dw+a;
[0066] Wherein, Dw represents the diameter of the ball 5; r represents the distance from the reference line to the first return channel 211; Figure 5 As shown, a represents the length of the step eliminating portion 6 extending in the first direction; the reference line is a straight line extending along the first direction where the center of the ball 5 is located when the ball 5 contacts the first load channel 11.
[0067] In the embodiment disclosed herein, a step elimination portion 6 is provided at the connection between the first return channel 211 and the first load channel 11, and the projection of the contour line 211a of the first return channel 211 close to one end of the step elimination portion 6 on the cross section perpendicular to the first direction is located between the projection of the first contour line 61 on the reference plane and the projection of the second contour line 62 on the reference plane. The distance from the center of the ball 5 to the first return channel 211 and the diameter of the ball 5 satisfy r≤0.5Dw+a, which can avoid the ball 5 from moving due to excessive space or impacting the junction of the step elimination portion 6 and the first return channel 211 and the first load channel 11, thereby reducing impact wear and extending service life; when avoiding the movement of the ball 5 due to excessive space, it can ensure that the ball 5 smoothly transitions in the step elimination portion 6.
[0068] The embodiment of the present disclosure does not specifically limit the value range of a. In some embodiments, the value range of a is 0.15 to 0.3 mm. For example, a can be any value of 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, etc.
[0069] In some embodiments, Figure 7 As shown, at the connection between the first load channel 11 and the first return channel 211, the distance from the reference line to the first return channel 211 and the diameter of the ball 5 satisfy:
[0070] 0.51Dw≤r≤0.5Dw+a;
[0071] Wherein, Dw represents the diameter of the ball 5; r represents the distance from the reference line to the first return channel 211; the reference line is a straight line extending along the first direction where the center of the ball 5 is located when the ball 5 contacts the first load channel 11; Figure 5 As shown in FIG. 1 , a represents the length of the step-eliminating portion 6 extending in the first direction. Figure 7 In the figure, the position of the reference line is indicated by the center o of the ball 5, and the distance from the reference line to the first return channel 211 at the connection is the distance from the center o of the ball 5 to the first return channel 211; the center of the first load channel 11 is c and the radius is R.
[0072] In the embodiment of the present disclosure, a step elimination portion 6 is provided at the connection between the first return channel 211 and the first load channel 11, and the projection of the contour line 211a of the first return channel 211 close to one end of the step elimination portion 6 on the cross section perpendicular to the first direction is located between the projection of the first contour line 61 on the reference plane and the projection of the second contour line 62 on the reference plane, and the distance from the center of the ball 5 to the first return channel 211 and the diameter of the ball 5 satisfy 0.51Dw≤r, so that the ball 5 can be moved from the first return channel 21 1 smoothly enters the first load channel 11, or smoothly enters the first return channel 211 from the first load channel 11, avoiding the ball being stuck or impacting due to too small a space; the distance from the center of the ball 5 to the first return channel 211 and the diameter of the ball 5 satisfy r≤0.5Dw+a, which can avoid the ball 5 from moving due to too large a space or impacting the junction of the step elimination part 6 and the first return channel 211 and the first load channel 11; when the space is too large and the ball 5 moves, it can ensure that the ball 5 smoothly transitions in the step elimination part 6. Through the above settings, impact wear can be reduced, service life can be extended, and the smoothness of the operation of the linear track device can be improved; compared with Figures 8 to 10 The slider assembly without the step elimination portion shown has a larger range of variation of r, which relaxes the manufacturing tolerance and can appropriately reduce the requirements for processing accuracy and assembly accuracy, thereby saving costs.
[0073] Fig.12 and Fig.13 It is a schematic diagram of a linear track device in an embodiment of the present disclosure. Fig.12 It is a three-dimensional schematic diagram of the linear track device. Fig.13 It is a cross-sectional schematic diagram of a linear track device.
[0074] like Fig.12 , Fig.13 As shown, the linear track device includes a linear track 3, a slider assembly, and a plurality of balls 5; the linear track 3 extends along a first direction.
[0075] like Figures 1 to 3 As shown, the slider assembly includes a slider 1 and a return device 2 respectively arranged at both ends of the slider 1; the slider 1 is provided with a first load channel 11 extending along the first direction, and the second load channel arranged on the linear track 3 cooperates to form a load channel 41; the slider 1 is also provided with a return channel 42 extending along the first direction. The return device 2 includes an inner portion 21 and an outer portion 22, the inner portion 21 is provided with a first return channel 211, and the outer portion 22 is provided with a second return channel, and the first return channel 211 cooperates with the second return channel to form a return channel 43; the load channel 41, the return channel 42, and the return channel 43 form a circulation channel, and a plurality of balls 5 are arranged in the circulation channel, and the balls 5 are, for example, steel balls. The first return channel 211 is connected to the first load channel 11.
[0076] Figure 4 , Figure 5 , Figure 6 It is an enlarged schematic diagram of the connection between the first return channel 211 and the first load channel 11 .
[0077] like Figure 4 , Figure 5 , Figure 6 As shown, a step-eliminating portion 6 is provided at the connection between the first return channel 211 and the first load channel 11 . The step-eliminating portion includes a first contour line 61 close to the first return channel 211 and a second contour line 62 close to the first load channel 11 .
[0078] Figure 7 It is a schematic diagram of projections of the first contour line 61 , the second contour line 62 , and the contour line 211 a of the first return channel 211 close to one end of the step eliminating portion 6 on a reference plane, where the reference plane is a cross section perpendicular to the first direction.
[0079] like Figure 4 , Figure 5 , Figure 6 , Figure 7As shown, the projection of the contour line 211a of the first return channel 211 close to the step eliminating portion 6 on the cross section perpendicular to the first direction is located between the projection of the first contour line 61 and the projection of the second contour line 62 on the reference plane.
[0080] In some embodiments, Figure 4 , Figure 5 , Figure 6 As shown, the step eliminating portion 6 includes a chamfer provided at one end of the first load channel 11 close to the first return channel 211 ; the radius of the first contour line 61 is greater than the radius of the second contour line 62 .
[0081] In some embodiments, Figure 7 As shown, at the connection between the first load channel 11 and the first return channel 211, the distance from the reference line to the first return channel 211 and the diameter of the ball 5 satisfy:
[0082] 0.51Dw≤r;
[0083] Wherein, Dw represents the diameter of the ball 5; r represents the distance from the reference line to the first return channel 211; the reference line is the straight line where the center of the ball 5 arranged on the first load channel 11 is located. Figure 7 In the figure, the position of the reference line is indicated by the center o of the ball 5, and the distance from the reference line to the first return channel 211 at the connection is the distance from the center o of the ball 5 to the first return channel 211; the center of the first load channel 11 is c and the radius is R.
[0084] In the embodiment of the present disclosure, a step eliminating portion 6 is provided at the connection between the first return channel 211 and the first load channel 11, and the distance from the center of the ball 5 to the first return channel 211 and the diameter of the ball 5 satisfy 0.51Dw≤r, so that the ball 5 can smoothly enter the first load channel 11 from the first return channel 211, or smoothly enter the first return channel 211 from the first load channel 11, avoiding ball jamming or impact due to too small space, so that the ball 5 can smoothly transition at the connection and be smoothly sucked in and discharged, and the ball 5 and other components will not be worn or damaged due to impact, which is conducive to extending the service life.
[0085] In the embodiment of the present disclosure, it is possible to set 0.51Dw≤r. Figures 8 to 10 The slider assembly without the step elimination portion shown has a larger range of variation of r, which relaxes the manufacturing tolerance and can appropriately reduce the requirements for processing accuracy and assembly accuracy, thereby saving costs.
[0086] In some embodiments, at the connection between the first load channel 11 and the first return channel 211, the distance from the reference line to the first return channel 211 and the diameter of the ball 5 satisfy:
[0087] r≤0.5Dw+a;
[0088] Wherein, Dw represents the diameter of the ball 5; r represents the distance from the reference line to the first return channel 211; Figure 5 As shown, a represents the length of the step-eliminating portion 6 extending in the first direction; the reference line is the straight line where the centers of the balls 5 arranged on the first load channel 11 are located.
[0089] In the embodiment disclosed herein, a step elimination portion 6 is provided at the connection between the first return channel 211 and the first load channel 11, and the distance from the center of the ball 5 to the first return channel 211 and the diameter of the ball 5 satisfy r≤0.5Dw+a, which can avoid the ball 5 from moving due to excessive space or impacting the connection point between the step elimination portion 6 and the first return channel 211 and the first load channel 11, thereby reducing impact wear and extending service life; when avoiding the ball 5 from moving due to excessive space, it can ensure that the ball 5 smoothly transitions in the step elimination portion 6.
[0090] The embodiment of the present disclosure does not specifically limit the value range of a. In some embodiments, the value range of a is 0.15 to 0.3 mm. For example, a can be any value of 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, etc.
[0091] In some embodiments, Figure 7 As shown, at the connection between the first load channel 11 and the first return channel 211, the distance from the reference line to the first return channel 211 and the diameter of the ball 5 satisfy:
[0092] 0.51Dw≤r≤0.5Dw+a;
[0093] Wherein, Dw represents the diameter of the ball 5; r represents the distance from the reference line to the first return channel 211; the reference line is the straight line where the center of the ball 5 arranged on the first load channel 11 is located; Figure 5 As shown in FIG. 1 , a represents the length of the step-eliminating portion 6 extending in the first direction. Figure 7 In the figure, the position of the reference line is indicated by the center o of the ball 5, and the distance from the reference line to the first return channel 211 at the connection is the distance from the center o of the ball 5 to the first return channel 211; the center of the first load channel 11 is c and the radius is R.
[0094] In the disclosed embodiment, a step eliminating portion 6 is provided at the connection between the first return channel 211 and the first load channel 11. The distance from the center of the ball 5 to the first return channel 211 and the diameter of the ball 5 satisfy 0.51Dw≤r, which enables the ball 5 to smoothly enter the first load channel 11 from the first return channel 211, or to smoothly enter the first return channel 211 from the first load channel 11, thereby avoiding the ball being stuck or impacting due to a small space; the distance from the center of the ball 5 to the first return channel 211 and the diameter of the ball 5 satisfy r≤0.5Dw+a, thereby avoiding the ball 5 from moving around due to a large space or impacting the junction of the step eliminating portion 6 and the first return channel 211 and the first load channel 11; in the case where the ball 5 moves around due to a large space, it is ensured that the ball 5 smoothly transitions in the step eliminating portion 6. Through the above arrangement, impact wear can be reduced, service life can be extended, and the smoothness of the operation of the linear track device can be improved; compared to the following examples: Figures 8 to 10 The slider assembly without the step elimination portion shown has a larger range of variation of r, which relaxes the manufacturing tolerance and can appropriately reduce the requirements for processing accuracy and assembly accuracy, thereby saving costs.
[0095] Example embodiments have been disclosed herein, and although specific terms are employed, they are used and should be interpreted only in a general illustrative sense and not for limiting purposes. In some instances, it will be apparent to those skilled in the art that, unless otherwise expressly noted, features, characteristics, and / or elements described in conjunction with a particular embodiment may be used alone or in combination with features, characteristics, and / or elements described in conjunction with other embodiments. Therefore, those skilled in the art will appreciate that various changes in form and detail may be made without departing from the scope of the present disclosure as set forth in the appended claims.
Claims
1. A slider assembly for a linear track device, the slider assembly comprising a slider (1) and a return device (2) respectively arranged at both ends of the slider (1); the slider (1) is provided with a first load channel (11) extending along a first direction, used to cooperate with a second load channel arranged on a linear track (3) of the linear track device to form a load channel (41); the slider (1) is also provided with a return channel (42) extending along the first direction; the return device (2) comprises an inner side portion (21) and an outer side portion (22), the inner side portion (21) is provided with a first return channel (211), the outer side portion (22) is provided with a second return channel, the first return channel (211) cooperates with the second return channel to form a return channel (43); the load channel (41), the return channel (42), and the return channel (43) constitute a circulation channel, used to accommodate a plurality of balls (5) and allow the balls (5) to roll in the circulation channel; characterized in that The first return channel (211) is connected to the first load channel (11); A step eliminating portion (6) is provided at the connection between the first return channel (211) and the first load channel (11); The step-eliminating portion (6) comprises a first contour line (61) close to one end of the first return channel (211) and a second contour line (62) close to one end of the first load channel (11); on a cross section perpendicular to the first direction, a projection of a contour line (211a) of one end of the first return channel (211) close to the step-eliminating portion (6) is located between the projection of the first contour line (61) and the projection of the second contour line (62).
2. The slider assembly according to claim 1, characterized in that The step eliminating portion (6) comprises a chamfer arranged at one end of the first load channel (11) close to the first return channel (211); the radius of the first contour line (61) is greater than the radius of the second contour line (62).
3. The slider assembly according to claim 2, characterized in that: At the connection, the distance from the reference line to the first return channel (211) and the diameter of the ball (5) satisfy: 0.51Dw≤r; Wherein, Dw represents the diameter of the ball (5); r represents the distance from the reference line to the first return channel (211); the reference line is a straight line extending along the first direction where the center of the ball (5) is located when the ball (5) contacts the first load channel (11).
4. The slider assembly according to claim 2 or 3, characterized in that: At the connection, the distance from the reference line to the first return channel (211) and the diameter of the ball (5) satisfy: r≤0.5Dw+a; Wherein, Dw represents the diameter of the ball (5); r represents the distance from the reference line to the first return channel (211); a represents the length of the step elimination portion (6) extending in the first direction; the reference line is a straight line extending along the first direction where the center of the ball (5) is located when the ball (5) contacts the first load channel (11).
5. The slider assembly according to claim 4, characterized in that: The value range of a is 0.15 to 0.3 mm.
6. A linear track device, comprising a linear track (3), a slider assembly, and a plurality of balls (5); The linear track (3) extends along a first direction; The slider assembly comprises a slider (1) and a return device (2) respectively arranged at two ends of the slider (1); the slider (1) is provided with a first load channel (11) extending along the first direction; the first load channel (11) cooperates with a second load channel arranged on the linear track (3) to form a load channel (41); the slider (1) is also provided with a return channel (42) extending along the first direction; the return device (2) comprises an inner portion (21) and an outer portion (22); the inner portion (21) is provided with a first return channel (211), the outer portion (22) is provided with a second return channel, the first return channel (211) cooperates with the second return channel to form a return channel (43); the load channel (41), the return channel (42), and the return channel (43) constitute a circulation channel; a plurality of balls (5) are arranged in the circulation channel and are capable of rolling in the circulation channel; It is characterized in that The first return channel (211) is connected to the first load channel (11); A step eliminating portion (6) is provided at the connection between the first return channel (211) and the first load channel (11); The step-eliminating portion (6) comprises a first contour line (61) close to one end of the first return channel (211) and a second contour line (62) close to one end of the first load channel (11); on a cross section perpendicular to the first direction, a projection of a contour line (211a) of one end of the first return channel (211) close to the step-eliminating portion (6) is located between the projection of the first contour line (61) and the projection of the second contour line (62).
7. The linear track device according to claim 6, characterized in that: The step eliminating portion (6) comprises a chamfer arranged at one end of the first load channel (11) close to the first return channel (211); the radius of the first contour line (61) is greater than the radius of the second contour line (62).
8. The linear track device according to claim 7, characterized in that: At the connection, the distance from the reference line to the first return channel (211) and the diameter of the ball (5) satisfy: 0.51Dw≤r; Wherein, Dw represents the diameter of the ball (5); r represents the distance from the reference line to the first return channel (211); and the reference line is a straight line on which the centers of the balls (5) arranged on the first load channel (11) are located.
9. The linear track device according to claim 7 or 8, characterized in that: At the connection, the distance from the reference line to the first return channel (211) and the diameter of the ball (5) satisfy: r≤0.5Dw+a; Wherein, Dw represents the diameter of the ball (5); r represents the distance from the reference line to the first return channel (211); a represents the length of the step elimination portion (6) extending in the first direction; and the reference line is a straight line on which the centers of the balls (5) arranged on the first load channel (11) are located.
10. The linear track device according to claim 9, characterized in that: The value range of a is 0.15 to 0.3 mm.