Connection structure of motor and bearing and main hand tool

Abstract

The present invention discloses a motor and bearing connection structure and a hand tool. The motor and bearing connection structure includes a housing, in which a motor is mounted. A hollow flange shaft is provided between the motor and the housing, with a clearance fit therebetween. A first bearing is provided on the inner side of the lower end of the housing, and the lower end of the flange shaft is positioned in engagement with the first bearing. In the motor and bearing connection structure of the present invention, the first bearing is mounted on the inner side of the lower end of the housing. This, on the one hand, is not affected by the size of the motor flange structure, thereby enabling the selection of a bearing based on more important factors. On the other hand, by moving the bearing downward, the diameter of the hand tool near the motor flange can be reduced, thereby facilitating comfortable operation.

Description

Technical Field

[0001] The present invention relates to a medical device, in particular to a connection structure of a motor and a bearing and a main hand tool. Background Art

[0002] For bearings and loads, a "carriage" arrangement is generally used: the load is in the center, with bearings at both ends. This allows the system to withstand large radial loads. Alternatively, a "simply supported beam" arrangement is employed, with one or more bearings mounted on one side and the load on the other. To increase system rigidity, the load is typically mounted as close to the isometric end face as possible. For hand tools with force feedback, a "carriage" arrangement is difficult, so a similar "simply supported beam" arrangement is generally employed. This ensures radial rigidity by placing the bearing end faces as close as possible to the motor and trigger.

[0003] However, due to the installation of the bearing, the outer ring is generally positioned axially using an end cap or a retaining ring. If an end cap is used, the connection is generally made by thread or flange, which will increase the diameter near the flange of the main hand tool motor, which is not conducive to operational comfort. If the end cap is connected by thread, it also requires sufficient wall thickness, but its outer and inner diameters are limited by the thread specifications, which is not conducive to reducing the outer diameter of the main hand tool. If a retaining ring is used to fix the outer ring of the bearing, it will occupy a large amount of radial space within the outer ring. Due to the internal motor, it may be difficult to install the retaining ring. How to minimize the outer diameter of the main hand tool has become one of the key technologies in designing a main hand tool with force feedback function.

[0004] Therefore, those skilled in the art are committed to developing a connection structure between the motor and the bearing that can reduce the outer diameter of the main hand tool to the maximum extent. Summary of the Invention

[0005] In view of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is to provide a connection structure between a motor and a bearing that can reduce the outer diameter of a main hand tool to the maximum extent.

[0006] To achieve the above-mentioned objectives, the present invention provides a connection structure between a motor and a bearing, comprising an electrical shell, in which a motor is installed, a hollow flange shaft with a clearance fit between the motor and the electrical shell is provided, a first bearing is provided on the inner side of the lower end of the electrical shell, and the lower end of the flange shaft is positioned in cooperation with the first bearing.

[0007] Preferably, the outer circle of the lower end of the flange shaft is clearance-fitted with the inner circle of the first bearing, and the lower end of the flange shaft is further provided with a third boss protruding radially outward, and the lower end of the third boss abuts against the upper end of the inner ring of the first bearing.

[0008] Preferably, the motor is provided with a motor flange, the flange shaft is provided with a first boss extending radially inward, the first boss is fixed to the flange surface of the motor flange by a countersunk screw, the motor flange is provided with a second boss protruding along its axial direction, the inner circle of the first boss abuts the outer circle of the second boss, and positioning pins are provided on the motor flange and the first boss for circumferential positioning of the first boss.

[0009] In order to better limit the axial position of the flange shaft, it further includes a limiting sleeve, the inner circle of the limiting sleeve is clearance-matched with the outer circle of the lower end of the flange shaft, the upper end of the limiting sleeve abuts against the lower end of the inner ring of the first bearing, the lower end of the flange shaft is provided with at least one spiral groove, and the limiting sleeve is provided with a spiral boss that cooperates with the spiral groove. When the spiral boss is stuck in the spiral groove, the axial position of the flange shaft is limited.

[0010] Preferably, a first set screw is threadedly connected between the limiting sleeve and the flange shaft for limiting the circumferential position of the limiting sleeve.

[0011] Preferably, the lower end of the limiting sleeve is provided with a screw-fastening groove for inserting a tool.

[0012] The present invention also provides a main hand tool, including the above-mentioned connection structure of the motor and the bearing, and also including a large trigger and a small trigger, the large trigger is dynamically connected to the motor body of the motor, and the small trigger is dynamically connected to the motor shaft of the motor.

[0013] In order to reduce the wall thickness of the electrical shell and the flange shaft, further, a plurality of spaced recesses are provided on the inner side surface of the lower end of the electrical shell, and the lower end of the flange shaft is a plug-in portion corresponding to the recessed portion, and the arc length corresponding to the plug-in portion is smaller than the arc length corresponding to the recessed portion.

[0014] Preferably, when the inserting portion abuts against the side surface of the recessed portion, the large trigger and the small trigger rotate to their maximum limit positions.

[0015] In order to reduce the axial dimension of the main hand tool in the direction of the motor, further, a tool cover is installed on the upper end of the tool shell, and a top cover is provided on the upper end of the tool cover. The inner circle of the top cover is gap-matched with the outer circle of the tool cover, and a limiting cam is provided on the inner circumference of the lower end of the top cover. A limiting groove corresponding to the limiting cam is provided on the tool cover, and the upper surface of the limiting cam is fitted with the upper surface of the limiting groove to form an axial limit for the top cover.

[0016] Preferably, a second set screw is threadedly connected between the top cover and the tool support cover to limit the circumferential position of the tool support cover.

[0017] Preferably, it also includes an upper flat rod connected to the large trigger and a lower flat rod connected to the small trigger, the lower flat rod and the upper flat rod are connected by a long trigger pin, a second bearing is installed at the lower end of the long trigger pin, and a guide rail for the sliding of the second bearing is provided on the support cover.

[0018] In order to facilitate operation, it further includes a connecting rod connected to the lower end of the electrical shell, a wrench is hinged on the connecting rod, and a clutch button is also provided on the connecting rod. The clutch button is triggered when the wrench is rotated to the extreme position.

[0019] Preferably, the wrench is provided with a hemispherical protrusion, and the protrusion abuts against the upper surface of the clutch button.

[0020] The beneficial effects of the present invention are: in the connection structure of the motor and the bearing of the present invention, the first bearing is installed on the inner side of the lower end of the motor housing. On the one hand, it is not affected by the structural size of the motor connection flange, so that the bearing can be selected according to other more important factors. On the other hand, the downward movement of the bearing can reduce the diameter near the flange of the main hand tool motor, which is beneficial to the operating comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the connection structure of the motor and the bearing and the main hand tool of the present invention.

[0022] Figure 2 It is along Figure 1 Cross-sectional view along the CC line.

[0023] Figure 3 yes Figure 1 Top view of .

[0024] Figure 4 It is along Figure 3 Sectional view along line AA.

[0025] Figure 5 It is along Figure 4 Cross-sectional view along line BB.

[0026] Figure 6 It is along Figure 3 Cross-sectional view along the DD line.

[0027] Figure 7 It is a partial structural diagram of the main hand tool of the present invention.

[0028] Figure 8 It is a schematic diagram of the three-dimensional structure of the main hand tool of the present invention.

[0029] Figure 9 yes Figure 8 Bottom view of . DETAILED DESCRIPTION

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, in the description of the present invention, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific manner. Therefore, they should not be construed as limiting the present invention. The terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] like Figures 1-9 As shown, a connection structure of a motor and a bearing includes an electrical shell 4, in which a motor 2 is installed, a hollow flange shaft 1 with a clearance fit is provided between the motor 2 and the electrical shell 4, a first bearing 5 is provided on the inner side of the lower end of the electrical shell 4, and the lower end of the flange shaft 1 is positioned in cooperation with the first bearing 5.

[0032] The outer circle of the lower end of the flange shaft 1 is clearance-fitted with the inner circle of the first bearing 5 . The lower end of the flange shaft 1 is further provided with a third boss 102 protruding radially outward. The lower end of the third boss 102 abuts against the upper end of the inner ring of the first bearing 5 .

[0033] The motor 2 is provided with a motor flange 201, and the flange shaft 1 is provided with a first boss 101 extending radially inward. The first boss 101 is fixed to the flange surface of the motor flange 201 by a countersunk screw 22. The motor flange 201 is provided with a second boss 2011 protruding along its axial direction. The inner circle of the first boss 101 abuts against the outer circle of the second boss 2011. Positioning pins 28 are passed through the motor flange 201 and the first boss 101 for circumferential positioning of the first boss 101.

[0034] It also includes a limiting sleeve 12, the inner circle of the limiting sleeve 12 is clearance-matched with the outer circle of the lower end of the flange shaft 1, the upper end of the limiting sleeve 12 is in contact with the lower end of the inner ring of the first bearing 5, and the lower end of the flange shaft 1 is provided with at least one spiral groove 103. The limiting sleeve 12 is provided with a spiral boss 1201 that cooperates with the spiral groove 103. When the spiral boss 1201 is inserted into the spiral groove 103, an axial limit is formed on the flange shaft 1.

[0035] A first set screw 30 is threadedly connected between the limiting sleeve 12 and the flange shaft 1 for limiting the circumferential position of the limiting sleeve 12 .

[0036] The lower end of the limiting sleeve 12 is provided with a screw-fastening groove 1202 for inserting a tool.

[0037] The above-mentioned connection structure of the motor and the bearing can be applied to a main hand tool, which also includes a large trigger 3 and a small trigger 13. The large trigger 3 is dynamically connected to the motor body of the motor 2, and the small trigger 13 is dynamically connected to the motor shaft of the motor 2.

[0038] The inner side surface of the lower end of the electrical housing 4 is provided with a plurality of spaced recesses 401 . The lower end of the flange shaft 1 is a plug-in portion 104 corresponding to the recess 401 . The arc length corresponding to the plug-in portion 104 is smaller than the arc length corresponding to the recess 401 .

[0039] When the inserting portion 104 abuts against the side surface of the recessed portion 401 , the large trigger 3 and the small trigger 13 rotate to the maximum limit position.

[0040] A tool support cover 17 is installed at the upper end of the tool shell 4, and a top cover 18 is provided at the upper end of the tool support cover 17. The inner circle of the top cover 18 is clearance-matched with the outer circle of the tool support cover 17. A limiting convex tooth 1801 is provided on the inner circumference of the lower end of the top cover 18, and a limiting groove 1701 corresponding to the limiting convex tooth 1801 is provided on the tool support cover 17. The upper surface of the limiting convex tooth 1801 is fitted with the upper surface of the limiting groove 1701 to form an axial limit for the top cover 18.

[0041] A second set screw 27 is threadedly connected between the top cover 18 and the tool support cover 17 to limit the circumferential position of the tool support cover 17.

[0042] It also includes an upper flat rod 15 connected to the large trigger 3 and a lower flat rod 16 connected to the small trigger 13. The lower flat rod 16 is connected to the upper flat rod 15 through a long trigger pin 20. A second bearing 21 is installed at the lower end of the long trigger pin 20, and a guide rail for the sliding of the second bearing 21 is provided on the support cover 17.

[0043] The utility model further comprises a connecting rod 6 connected to the lower end of the electric housing 4, a wrench 10 is hinged on the connecting rod 6, and a clutch button 9 is also provided on the connecting rod 6. The clutch button 9 is triggered when the wrench 10 is rotated to the extreme position.

[0044] The wrench 10 is provided with a hemispherical protrusion, which abuts against the upper surface of the clutch button 9. Since the clutch button 9 has its own reset spring, the upper surface of the clutch button 9 can lift the wrench 10 to its initial position. When the user's finger pulls the upper end of the wrench 10 toward the axis of the motor, the wrench 10 rotates around the center of the wrench shaft 25, driving the protrusion on the wrench 10 to press the clutch button 9 downward. When the upper rear end of the wrench 10 contacts the outer cylindrical surface of the electric shell 4 (that is, the wrench 10 rotates to the extreme position), the clutch button 9 is triggered, and a clutch trigger signal is transmitted to the control center through a cable.

[0045] The main hand tool of the present invention hinges the wrench 10 on the connecting rod 6 and utilizes the lever principle to trigger the clutch button 9 when the wrench 10 is rotated to the extreme position; the axial position of the top cover 18 is limited by the cooperation of the limiting groove 1701 provided on the tool cover 17 and the upper limiting convex tooth 1801 of the top cover 18; the rotation of the large trigger 3 and the small trigger 13 is limited by the cooperation of the plug-in portion 104 of the flange shaft 1 and the recessed portion 401 of the tool shell 4; the axial position of the flange shaft 1 is limited by the cooperation of the spiral boss 1201 on the limiting sleeve 12 and the spiral groove 103 on the flange shaft 1.

[0046] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art through logical analysis, reasoning, or limited experimentation based on the concepts of the present invention and the prior art should be within the scope of protection defined by the claims.

Claims

1. A connection structure between a motor and a bearing, comprising a housing (4) in which a motor (2) is mounted, characterized in that: A hollow flange shaft (1) is provided between the motor (2) and the electric housing (4) to be clearance-matched therewith, a first bearing (5) is provided on the inner side of the lower end of the electric housing (4), and the lower end of the flange shaft (1) is positioned in cooperation with the first bearing (5); The flange shaft (1) is provided with a first boss (101) extending radially inward, and the first boss (101) is fixedly connected to the motor (2).

2. The connection structure between the motor and the bearing according to claim 1, characterized in that: The outer circle of the lower end of the flange shaft (1) is loosely matched with the inner circle of the first bearing (5). The lower end of the flange shaft (1) is also provided with a third boss (102) protruding radially outward, and the lower end of the third boss (102) abuts against the upper end of the inner ring of the first bearing (5).

3. The connection structure between the motor and the bearing according to claim 2, characterized in that: The motor (2) is provided with a motor flange (201), the first boss (101) is fixed to the flange surface of the motor flange (201) by a countersunk screw (22), the motor flange (201) is provided with a second boss (2011) protruding along its axial direction, the inner circle of the first boss (101) is in contact with the outer circle of the second boss (2011), and positioning pins (28) are passed through the motor flange (201) and the first boss (101).

4. The connection structure between the motor and the bearing according to claim 3, characterized in that: The invention also includes a limiting sleeve (12), the inner circle of the limiting sleeve (12) is loosely matched with the outer circle of the lower end of the flange shaft (1), the upper end of the limiting sleeve (12) is in contact with the lower end of the inner ring of the first bearing (5), the lower end of the flange shaft (1) is provided with at least one spiral groove (103), and the limiting sleeve (12) is provided with a spiral boss (1201) that matches the spiral groove (103). When the spiral boss (1201) is inserted into the spiral groove (103), an axial limit is formed on the flange shaft (1).

5. The connection structure between the motor and the bearing according to claim 4, characterized in that: A first set screw (30) is threadedly connected between the limiting sleeve (12) and the flange shaft (1).

6. The connection structure between the motor and the bearing according to claim 5, characterized in that: The lower end of the limiting sleeve (12) is provided with a screw-fastening groove (1202) for inserting a tool.

7. A main hand tool, characterized by: The invention comprises a connection structure of a motor and a bearing as claimed in any one of claims 1 to 6, and further comprises a large trigger (3) and a small trigger (13), wherein the large trigger (3) is dynamically connected to the motor body of the motor (2), and the small trigger (13) is dynamically connected to the motor shaft of the motor (2).

8. The master hand tool according to claim 7, wherein: A plurality of recessed portions (401) arranged at intervals are provided on the inner side surface of the lower end of the electrical housing (4); the lower end of the flange shaft (1) is a plug-in portion (104) corresponding to the recessed portion (401); and the arc length corresponding to the plug-in portion (104) is smaller than the arc length corresponding to the recessed portion (401).

9. The master hand tool according to claim 8, wherein: When the plug-in portion (104) abuts against the side surface of the recessed portion (401), the large trigger (3) and the small trigger (13) rotate to their maximum limit positions.

10. The master hand tool according to claim 7, wherein: A tool support cover (17) is installed at the upper end of the tool support cover (4), and a top cover (18) is provided at the upper end of the tool support cover (17). The inner circle of the top cover (18) is clearance-matched with the outer circle of the tool support cover (17). A limiting convex tooth (1801) is provided on the inner circumference of the lower end of the top cover (18), and a limiting groove (1701) corresponding to the limiting convex tooth (1801) is provided on the tool support cover (17). The upper surface of the limiting convex tooth (1801) is in contact with the upper surface of the limiting groove (1701), thereby forming an axial limit for the top cover (18).

11. The master hand tool according to claim 10, wherein: A second set screw (27) is threadedly connected between the top cover (18) and the support cover (17).

12. The master hand tool according to claim 10, wherein: The utility model further comprises an upper flat rod (15) connected to the large trigger (3) and a lower flat rod (16) connected to the small trigger (13); the lower flat rod (16) and the upper flat rod (15) are connected via a long trigger pin (20); a second bearing (21) is installed at the lower end of the long trigger pin (20); and a guide rail for the sliding of the second bearing (21) is provided on the support cover (17).

13. The master hand tool according to claim 7, wherein: The invention also includes a connecting rod (6) connected to the lower end of the electrical housing (4), a wrench (10) being hinged on the connecting rod (6), and a clutch button (9) being provided on the connecting rod (6), and the clutch button (9) is triggered when the wrench (10) is rotated to an extreme position.

14. The master hand tool according to claim 13, wherein: The wrench (10) is provided with a hemispherical protrusion, and the protrusion abuts against the upper surface of the clutch button (9).

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