Curved guide rail structure with large dimensional tolerance adaptability and thermal self-adaptation capability

Abstract

The present invention discloses an arc guide rail structure with large-size tolerance adaptability and thermal self-adaptation capability, including an arc gear ring guide rail and multiple groups of support structures; the support structure has a V-shaped bearing assembly and a bearing assembly base; the V-shaped bearing assembly adapts to the large-size tolerance of the cross section of the arc gear ring guide rail through a sliding V-shaped bearing; the bearing assembly base and the guide structure form a sliding pair that moves radially along the arc gear ring guide rail, and adapts to the thermal deformation of the arc guide rail structure through the sliding pair. The arc guide rail structure of the present invention adopts a V-shaped bearing dovetail sliding pair and a bearing assembly base dovetail sliding pair to achieve large-size tolerance adaptability and thermal self-adaptation to the arc guide rail. The first-level V-shaped bearing dovetail sliding pair keeps the V-shaped bearing in contact with the gear ring guide rail through the elastic force of the elastic pressure sheet, and achieves adaptability to large-size tolerance of the cross section; the second-level bearing assembly base dovetail sliding pair, through the release of radial displacement by the dovetail guide, achieves adaptability to overall thermal deformation.

Description

Technical Field

[0001] The invention relates to the field of space application technology, and in particular to an arc-shaped guide rail structure with large dimensional tolerance adaptability and thermal self-adaptability suitable for a rotary motion mechanism of a space optical payload. Background Art

[0002] Prior art 1, application number 201822126807.6, Chinese utility model patent entitled "Curved guide rail RCM needle insertion device for minimally invasive surgical puncture robot", see Figure 1 As shown, the device disclosed in the prior art 1 includes an arc-shaped guide rail, a needle insertion mechanism arranged on the arc-shaped guide rail, an arc-shaped motion driving mechanism for driving the needle insertion mechanism to slide along the arc on the arc-shaped guide rail, and a rotation driving mechanism for driving the arc-shaped guide rail to perform rotational motion; the arc-shaped guide rail includes a guide rail body, an upper flange and a lower flange respectively arranged on the upper and lower sides of the guide rail body, and an outer tooth portion arranged on the outer slideway of the guide rail body. The utility model drives the arc-shaped guide rail and the entire needle insertion mechanism and the arc-shaped motion driving mechanism thereon to perform rotational motion through a rotation driving mechanism, and drives the needle insertion mechanism to move along the arc on the arc-shaped guide rail through the arc-shaped motion driving mechanism. Through the combination of the two motions, the position of the needle insertion point of the puncture needle is fixed, and its needle insertion angle can be adjusted arbitrarily, thereby realizing the adjustment of the needle insertion posture.

[0003] Prior art 2, application number 201810787855.1, Chinese invention patent application entitled "A small arc guide rail with a sliding base", see Figure 2 As shown, the device disclosed in the second prior art includes a first guide rod, a second guide rod, a first sleeve, a second sleeve, a first positioning sleeve, a second positioning sleeve, a fixed frame, a first bracket, a second bracket, a third bracket, an arc guide rail, an arc base, a driving gear, a driven gear, a transmission shaft, and an arc rack; the first guide rod is interference-fitted with the fixed frame through the first sleeve, the second guide rod is interference-fitted with the fixed frame through the second sleeve, the arc guide rail is fitted with the arc base, the driving gear and the driven gear are interference-fitted with both ends of the transmission shaft, and the gear shaft is interference-fitted with the arc base. This device can be used as a guide rail component of a pruning robot to realize the arc motion of the robot's working parts, has a self-locking function, a simple structure, and stable operation.

[0004] After careful analysis of the above-mentioned prior art 1 and prior art 2, those skilled in the art have found the following defects of the prior art:

[0005] 1. The arc guide rails in the prior art have no ability to adapt to thermal environments;

[0006] 2. The arc guide rails in the prior art are not able to adapt to large dimensional tolerances of the guide rail cross section.

[0007] Therefore, based on the above technical problems, technicians in this field urgently need to develop an arc guide rail structure with large dimensional tolerance adaptability and thermal self-adaptation capability suitable for a rotational motion mechanism of a space optical payload. Summary of the invention

[0008] The purpose of the present invention is to provide an arc guide rail structure with large dimensional tolerance adaptability and thermal self-adaptation capability suitable for a rotary motion mechanism of a space optical payload. The arc guide rail structure achieves adaptability to large dimensional tolerance of the cross section through a V-shaped bearing dovetail sliding pair of a supporting structure, and also achieves adaptability to overall thermal deformation through a bearing group base dovetail sliding pair.

[0009] In order to achieve the above object, the present invention provides the following technical solutions:

[0010] The present invention discloses an arc-shaped guide rail structure with large dimensional tolerance adaptability and thermal self-adaptability, the arc-shaped guide rail structure comprising:

[0011] An arc-shaped gear ring guide rail, the arc-shaped gear ring guide rail is used to carry a rotating member; and

[0012] A plurality of groups of support structures are arranged at intervals along the circumferential direction of the arc-shaped gear ring guide rail;

[0013] The support structure has:

[0014] V-bearing assemblies and bearing group bases;

[0015] The V-shaped bearing assembly is installed on the bearing assembly base, and the V-shaped bearing assembly includes a fixed V-shaped bearing fixedly connected to the bearing assembly base and a sliding V-shaped bearing movably connected to the bearing assembly base;

[0016] The V-shaped bearing assembly adapts to the large cross-sectional dimension tolerance of the arc-shaped gear ring guide rail through the sliding V-shaped bearing to maintain contact with the outer peripheral surface of the arc-shaped gear ring guide rail;

[0017] The bottom of the bearing assembly base is slidably matched with a guide structure, and the bearing assembly base and the guide structure form a sliding pair that moves radially along the arc-shaped gear ring guide rail, and the thermal deformation of the arc-shaped guide rail structure is adapted through the sliding pair.

[0018] Furthermore, the arc-shaped gear ring guide is connected to the output end of the drive motor through a gear pair;

[0019] Both sides of the lower part of the arc-shaped gear ring guide rail are protruding to form bearing matching protrusions;

[0020] The fixed V-shaped bearing is installed on the inner side of the arc-shaped gear ring guide rail, and the sliding V-shaped bearing is installed on the outer side of the arc-shaped gear ring guide rail;

[0021] The fixed V-shaped bearing and the sliding V-shaped bearing both have a V-shaped matching groove matched with the bearing matching protrusion.

[0022] Further, the bearing group base is located below the arc-shaped gear ring guide rail, the bearing group base portion extends to the inner side of the arc-shaped gear ring guide rail, and the bearing group base portion extends to the outer side of the arc-shaped gear ring guide rail;

[0023] The fixed V-shaped bearing is connected to the bearing assembly base extending to the inner side of the arc-shaped gear ring guide rail by screws;

[0024] The portion of the bearing assembly base located outside the arc-shaped gear ring guide rail has a receiving space for receiving the sliding V-shaped bearing, and the sliding V-shaped bearing is embedded in the receiving space;

[0025] An elastic pressing sheet is installed on the outer side of the accommodating space, and the middle part of the elastic pressing sheet is recessed toward the accommodating space to abut against the sliding V-shaped bearing.

[0026] Furthermore, two sides of the bottom of the bearing assembly base protrude downward to form convex parts, and a dovetail groove is formed between the two convex parts;

[0027] The guide structure is a dovetail guide structure matching the dovetail groove;

[0028] The bearing assembly base forms a sliding pair through the dovetail groove and the dovetail guide structure.

[0029] In the above technical solution, the present invention provides an arc guide rail structure with large dimensional tolerance adaptability and thermal self-adaptability, which has the following beneficial effects:

[0030] The arc guide structure of the present invention adopts two-stage sliding pairs, namely, a V-shaped bearing dovetail sliding pair and a bearing assembly base dovetail sliding pair, to achieve large-size tolerance adaptability and thermal self-adaptation for the arc guide. Among them, the first-stage V-shaped bearing dovetail sliding pair keeps the V-shaped bearing and the gear ring guide in contact with each other through the elastic force of the elastic pressing sheet, and achieves adaptability to large-size tolerance of the cross section; the second-stage bearing assembly base dovetail sliding pair releases radial displacement through the dovetail guide to achieve adaptability to overall thermal deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0032] Figure 1 It is a structural schematic diagram of the arc guide rail of the prior art one;

[0033] Figure 2 It is a structural schematic diagram of the arc guide rail of the prior art 2;

[0034] Figure 3 A schematic diagram of the overall structure of an arc-shaped guide rail structure with large dimensional tolerance adaptability and thermal self-adaptation capability provided by an embodiment of the present invention;

[0035] Figure 4 A schematic diagram of the matching structure of a support structure and an arc guide rail of an arc guide rail structure with large dimensional tolerance adaptability and thermal self-adaptation capability provided in an embodiment of the present invention.

[0036] Description of reference numerals:

[0037] 10. Support structure;

[0038] 1. Arc gear ring guide; 2. Fixed V-shaped bearing; 3. Sliding V-shaped bearing; 4. Bearing assembly base; 5. Elastic pressure piece; 6. Dovetail guide structure;

[0039] 101, bearing matching convex part;

[0040] 401. Accommodating space; 402. Protrusion; 403. Dovetail groove. DETAILED DESCRIPTION

[0041] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0042] See 3 to Figure 4 As shown;

[0043] The embodiment of the present invention provides an arc-shaped guide rail structure with large dimensional tolerance adaptability and thermal self-adaptability, and the arc-shaped guide rail structure includes:

[0044] An arc-shaped gear ring guide rail 1, the arc-shaped gear ring guide rail 1 is used to carry a rotating member; and

[0045] A plurality of groups of support structures 10 are arranged at intervals along the circumferential direction of the arc-shaped gear ring guide rail 1;

[0046] The support structure 10 has:

[0047] V-shaped bearing assembly and bearing group base 4;

[0048] The V-shaped bearing assembly is installed on the bearing assembly base 4, and the V-shaped bearing assembly includes a fixed V-shaped bearing 2 fixedly connected to the bearing assembly base 4 and a sliding V-shaped bearing 3 movably connected to the bearing assembly base 4;

[0049] The V-shaped bearing assembly adapts to the large cross-sectional dimension tolerance of the arc-shaped gear ring guide rail 1 through the sliding V-shaped bearing 3 to maintain contact with the outer peripheral surface of the arc-shaped gear ring guide rail 1;

[0050] The bottom of the bearing assembly base 4 is slidably matched with a guide structure, and the bearing assembly base 4 and the guide structure form a sliding pair that moves radially along the arc-shaped gear ring guide rail 1, and the sliding pair adapts to the thermal deformation of the arc-shaped guide rail structure.

[0051] Specifically, this embodiment discloses a novel arc guide rail structure, which has the above-mentioned fixed V-shaped bearing 2 and sliding V-shaped bearing 3 installed on both sides of the arc gear ring guide rail 1, respectively, so as to adapt to the large dimensional tolerance of the cross section of the arc gear ring guide rail 1 through the sliding pair composed of the V-shaped bearings, so as to keep the V-shaped bearing in circumferential contact with the arc gear ring guide rail 1 at all times. Secondly, the arc guide rail structure of this embodiment integrates the above-mentioned fixed V-shaped bearing 2 and sliding V-shaped bearing 3 through the bearing group base 4. At the same time, the bottom of the bearing group base 4 has a guide structure, which is formed into a sliding pair through sliding cooperation with the guide structure, so as to adapt to the overall thermal deformation.

[0052] Preferably, the arc-shaped gear ring guide rail 1 of this embodiment is connected to the output end of the driving motor through a gear pair;

[0053] Both sides of the lower part of the arc-shaped gear ring guide rail 1 are protruded to form bearing matching protrusions 101;

[0054] The fixed V-shaped bearing 2 is installed on the inner side of the arc-shaped gear ring guide rail 1, and the sliding V-shaped bearing 3 is installed on the outer side of the arc-shaped gear ring guide rail 1;

[0055] Both the fixed V-shaped bearing 2 and the sliding V-shaped bearing 3 have a V-shaped matching groove that matches with the bearing matching protrusion 101 .

[0056] The bearing assembly base 4 of this embodiment is located below the arc-shaped gear ring guide 1, and a portion of the bearing assembly base 4 extends to the inner side of the arc-shaped gear ring guide 1, and a portion of the bearing assembly base 4 extends to the outer side of the arc-shaped gear ring guide 1;

[0057] The fixed V-shaped bearing 2 is connected to the bearing assembly base 4 extending to the inner side of the arc-shaped gear ring guide rail 1 by means of screws;

[0058] The portion of the bearing assembly base 4 located outside the arc-shaped gear ring guide rail 1 has a receiving space 401 for receiving the sliding V-shaped bearing 3, and the sliding V-shaped bearing 3 is embedded in the receiving space 401;

[0059] An elastic pressing sheet 5 is installed on the outer side of the accommodation space 401 , and the middle part of the elastic pressing sheet 5 is recessed toward the accommodation space 401 to abut against the sliding V-shaped bearing 3 .

[0060] First, the upper part of the arc-shaped gear ring guide 1 is driven by the driving motor through a gear pair, and a fixed V-shaped bearing 2 and a sliding V-shaped bearing 3 are respectively installed on both sides of the arc-shaped gear ring guide 1, and positioning is formed by the fixed V-shaped bearing 2 and the sliding V-shaped bearing 3; in addition, an elastic pressure plate 5 is installed on the outside of the accommodating space 401 accommodating the sliding V-shaped bearing 3, and the sliding V-shaped bearing 3 of this embodiment is pressed by the elastic pressure plate 5 to maintain contact with the arc-shaped gear ring guide 1, and its elastic force can adapt to the large dimensional tolerance of the gear ring guide cross section.

[0061] Preferably, the two sides of the bottom of the bearing assembly base 4 of this embodiment protrude downward to form a convex portion 402, and a dovetail groove 403 is formed between the two convex portions 402;

[0062] The guide structure is a dovetail guide structure 6 that matches the dovetail groove 403;

[0063] The bearing assembly base 4 forms a sliding pair through the dovetail groove 403 and the dovetail guide structure 6.

[0064] The arc guide rail structure of the present embodiment as a whole is subjected to large temperature changes in the space environment. The arc gear ring guide rail 1 will produce thermal deformation, and the whole will shrink or expand radially along the dovetail guide structure 6, thereby having thermal adaptability, and the dovetail guide structure 6 of the support structure 10 of the present embodiment can adapt to a larger overall roundness tolerance.

[0065] In addition, the structure of the present application can be applied to arc gear ring guide rails 1 of meter and sub-meter sizes by adjusting the number of support structures 10. It has a compact support layout, strong mechanical and thermal adaptability, and can complete a full rotation of the bearing.

[0066] In the above technical solution, the present invention provides an arc guide rail structure with large dimensional tolerance adaptability and thermal self-adaptability, which has the following beneficial effects:

[0067] The arc guide structure of the present invention adopts two-stage sliding pairs, namely, a V-shaped bearing dovetail sliding pair and a bearing assembly base dovetail sliding pair, to achieve large-size tolerance adaptability and thermal self-adaptation for the arc guide. Among them, the first-stage V-shaped bearing dovetail sliding pair keeps the V-shaped bearing in contact with the arc gear ring guide 1 through the elastic force of the elastic pressing sheet 5, and achieves adaptability to large-size tolerance of the cross section; the second-stage bearing assembly base dovetail sliding pair releases the radial displacement through the dovetail guide structure 6, and achieves adaptability to overall thermal deformation.

[0068] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An arc-shaped guide rail structure with large dimensional tolerance adaptability and thermal self-adaptability, characterized in that: The arc guide rail structure comprises: An arc-shaped gear ring guide rail (1), the arc-shaped gear ring guide rail (1) being used to carry a rotating member, the arc-shaped gear ring guide rail (1) being connected to an output end of a driving motor via a gear pair, and both sides of a lower portion of the arc-shaped gear ring guide rail (1) being protrudingly formed into bearing matching protrusions (101); and A plurality of groups of support structures (10) arranged at intervals in the circumferential direction along the arc-shaped gear ring guide rail (1); The support structure (10) has: V-shaped bearing assembly and bearing assembly base (4); The V-shaped bearing assembly is mounted on the bearing assembly base (4), and the V-shaped bearing assembly comprises a fixed V-shaped bearing (2) fixedly connected to the bearing assembly base (4) and a sliding V-shaped bearing (3) movably connected to the bearing assembly base (4), the fixed V-shaped bearing (2) being mounted on the inner side surface of the arc-shaped gear ring guide rail (1), and the sliding V-shaped bearing (3) being mounted on the outer side surface of the arc-shaped gear ring guide rail (1), and the fixed V-shaped bearing (2) and the sliding V-shaped bearing (3) both have a V-shaped matching groove matching with the bearing matching protrusion (101); The V-shaped bearing assembly adapts to the large cross-sectional dimension tolerance of the arc-shaped gear ring guide rail (1) through the sliding V-shaped bearing (3) so as to maintain contact with the outer peripheral surface of the arc-shaped gear ring guide rail (1); The bottom of the bearing assembly base (4) is slidably matched with a guide structure, the bearing assembly base (4) and the guide structure form a sliding pair that moves radially along the arc-shaped gear ring guide rail (1), and the sliding pair is used to adapt to thermal deformation of the arc-shaped guide rail structure; The bearing assembly base (4) is located below the arc-shaped gear ring guide rail (1), a portion of the bearing assembly base (4) extends to the inner side of the arc-shaped gear ring guide rail (1), and a portion of the bearing assembly base (4) extends to the outer side of the arc-shaped gear ring guide rail (1); The fixed V-shaped bearing (2) is connected to a bearing assembly base (4) extending to the inner side of the arc-shaped gear ring guide rail (1) via screws; The portion of the bearing assembly base (4) located outside the arc-shaped gear ring guide rail (1) has a receiving space for receiving the sliding V-shaped bearing (3), and the sliding V-shaped bearing (3) is embedded in the receiving space (401); An elastic pressing sheet (5) is installed on the outer side surface of the accommodating space (401), and the middle part of the elastic pressing sheet (5) is recessed toward the accommodating space (401) to abut against the sliding V-shaped bearing (3).

2. The arc guide rail structure with large dimensional tolerance adaptability and thermal self-adaptability according to claim 1, characterized in that: Both sides of the bottom of the bearing assembly base (4) protrude downwards to form convex parts (402), and a dovetail groove (403) is formed between the two convex parts (402); The guide structure is a dovetail guide structure (6) that matches the dovetail groove (403); The bearing assembly base (4) forms a sliding pair through the dovetail groove (403) and the dovetail guide structure (6).

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