CN112018936A

CN112018936A - Scrubbing brush assembly structure for automobile motor

Info

Publication number: CN112018936A
Application number: CN202010892540.0A
Authority: CN
Inventors: 黄生英
Original assignee: Nanjing Ruida Electric Technology Co ltd
Current assignee: Nanjing Ruida Electric Technology Co ltd
Priority date: 2020-08-31
Filing date: 2020-08-31
Publication date: 2020-12-01

Abstract

The invention discloses a scrubbing brush assembly structure for an automobile motor, which comprises a plastic particle board, a limiting bulge, an inductance frame and a guide post, wherein a conducting strip is arranged inside the plastic particle board, butt joint holes are formed in the surfaces of corners at four ends of the plastic particle board, a brush holder is arranged on one side of the plastic particle board close to the butt joint holes, support plates are arranged on two sides of the brush holder, a connecting groove is formed between the brush holder and the support plates, sockets are arranged at two ends of the brush holder, a long hole is formed in the surface of one side of the brush holder close to the adjacent support plates, and a carbon brush is connected inside the brush holder. This scrubbing brush assembly structure for automobile motor shifts up in the regulation hole through the pull rod to stir the rotating turret rotatory in the spout, and extrude the guide post through the inside spring leaf of through-hole, make the guide post during the jack of inserting into rotating turret one side downwards, weld the surface of enameled wire and conducting strip again, thereby make the inductance coils who has the rectification effect conveniently protect in this scrubbing brush assembly.

Description

Scrubbing brush assembly structure for automobile motor

Technical Field

The invention relates to the technical field of automobile motors, in particular to a scrubbing brush assembly structure for an automobile motor.

Background

A brushed electric motor is a rotating electric machine that converts electrical energy into mechanical energy or mechanical energy into electrical energy, with a brush arrangement incorporated therein. The brush plate assembly is applied to the interior of an automobile direct-current motor, and the armature of the direct-current motor is supplied with power, so that an enameled wire in the armature passes through current and forms torque in a fixed magnetic field of the motor, the motor rotates, and the conversion of electric energy into mechanical energy is realized. In the process of using the scrubbing brush assembly, the scrubbing brush assembly is innovated, so that the scrubbing brush assembly has the effects of being convenient to disassemble and assemble, protecting components and the like in the motor.

Although the scrubbing brush assembly structure for the automobile motor in the current market is very many in type and quantity, the scrubbing brush assembly structure for the automobile motor has the following defects: the brush holder component of the scrubbing brush assembly structure can not be assembled and disassembled, the brush holder component of the scrubbing brush assembly structure can not be replaced after being fixed, the carbon brush of the scrubbing brush assembly structure can not be worn and then can not fall off, and the components with the rectification anti-interference function of the scrubbing brush assembly structure can not be installed in the scrubbing brush assembly structure with the same specification and can not be supported and protected when being used. Therefore, the structure of the scrubbing brush assembly for the existing automobile motor needs to be improved.

Disclosure of Invention

The invention aims to provide a scrubbing brush assembly structure for an automobile motor, and aims to solve the problems that a brush holder component of a scrubbing brush assembly structure in the existing market, which is provided by the background technology, cannot be assembled and disassembled, cannot be replaced after being fixed, has a falling risk after a carbon brush of the scrubbing brush assembly structure is worn, and cannot be supported and protected when components with rectification anti-interference functions and components with rectification anti-interference functions of the scrubbing brush assembly structure in the same specification are mounted in the scrubbing brush assembly structure.

In order to achieve the purpose, the invention provides the following technical scheme: a scrubbing brush assembly structure for an automobile motor comprises a plastic particle board, a limiting bulge, an inductance frame and a guide post, wherein a conducting strip is arranged inside the plastic particle board, butt joint holes are formed in the surfaces of four corner corners of the plastic particle board, a brush holder is arranged on one side of the plastic particle board close to the butt joint holes, wherein,

support plates are arranged on two sides of the brush holder, a connecting groove is formed between the brush holder and the support plates, sockets are arranged at two ends of the brush holder, a long hole is formed in the surface of one side, close to the support plates, of the brush holder, a carbon brush is connected inside the brush holder, a first clamping groove is formed in the surface, close to the long hole, of the carbon brush, a second clamping groove is formed in one side of the inner wall of the first clamping groove, a limiting bulge is arranged inside the long hole, the limiting bulge is in butt joint with the first clamping groove through an inserting plate, and the limiting bulge is in butt joint with the second clamping groove through a;

the inductance frame is arranged on two sides of the plastic particle board, the two sides of the inductance frame are provided with butt plates, the middle part of each butt plate is provided with a limit groove, the butt plates are in butt joint with mounting grooves in the surfaces of two sides of the plastic particle board, the middle part of each mounting groove is provided with a positioning seat, the positioning seats are connected with the limit grooves in the middle parts of the butt plates, the butt plates are fixed with the plastic particle board through locking nails, the middle part of one side, away from the butt plates, of the inductance frame is provided with a third clamping groove, the inner side of the inductance frame is provided with a magnetic core, two ends of the magnetic core are in butt joint with the third clamping groove through a fixing convex seat, and the outer;

one side of inductance frame is provided with spacing, the inductance frame is kept away from one side of spacing and has been seted up the spout, the spout carries out swing joint through pivot and rotating turret, the rotating turret has stretched into the surface of spout one end and has seted up the jack, spacing top inboard that is close to the spout has seted up the through-hole, the guide post docks with the through-hole, the top of guide post is connected with the spring leaf, spacing one side that is close to the through-hole has seted up the regulation hole, the internal connection of regulation hole has the pull rod, the one end and the guide post of pull rod are fixed.

Preferably, the support plates are distributed at equal intervals, the support plates are T-shaped, and the size of each support plate is matched with that of each connecting groove.

Preferably, the socket is in the shape of a barb, the socket and the brush holder are vertically distributed, and the socket and the butt hole are in plug connection.

Preferably, the limiting protrusions are symmetrically distributed about the center line of the carbon brush, an L-shaped structure is formed between the limiting protrusions and the inserting plate, and the width of the limiting protrusions is matched with that of the long holes.

Preferably, the snap ring is semicircular, and the snap ring forms a clamping structure with the carbon brush through the second clamping groove.

Preferably, be vertical distribution between butt joint board and the inductance frame, and be interference fit between butt joint board and the mounting groove.

Preferably, the limiting groove is U-shaped, and the size of the limiting groove is matched with that of the positioning seat.

Preferably, the thickness of the rotating frame is matched with the width of the surface of the sliding chute, one side of the rotating frame, which is close to the enameled wire, is of an arc-shaped structure, and the rotating frame is in rotary connection with the sliding chute.

Preferably, the guide posts and the pull rod are vertically distributed, the diameters of the guide posts are matched with those of the insertion holes, and the guide posts form a telescopic structure through the spring pieces and the through holes.

Preferably, the height from the top end of the adjusting hole to the top end of the pull rod is larger than the depth of the insertion hole, and the width of the adjusting hole is matched with the diameter of the pull rod.

Compared with the prior art, the invention has the beneficial effects that:

(1) the scrubbing brush assembly structure for the automobile motor is characterized in that the support plates on the two sides of the brush holder are arranged to be T-shaped, and the support plates and the connecting grooves are pressed to be clamped, so that the brush holder forms a cylindrical structure, and the brush holder is convenient to assemble and disassemble in the using process;

(2) the socket with the barb-shaped ends at the two ends of the brush holder is inserted into the butt joint hole in the surface of the plastic particle board, so that the socket is reversely locked in the butt joint hole, otherwise, the socket can be driven to be separated from the butt joint hole by pressing the barb-shaped socket, and the brush holder can be conveniently replaced in time when being used and damaged on the plastic particle board;

(3) this scrubbing brush assembly structure for automobile motor, with the picture peg of spacing protruding one side from the outside of slot hole peg graft into first draw-in groove to press down snap ring and the second draw-in groove that spacing protruding drive kept away from picture peg one side and carry out the joint, thereby when the carbon brush when the telescopic movement of carbon brush in the brush holder, can conveniently carry on spacingly to the telescopic movement of carbon brush, the problem of droing appears after avoiding the carbon brush wearing and tearing.

(4) The scrubbing brush assembly structure for the automobile motor is characterized in that a U-shaped limiting groove in the middle of a butt joint plate is in butt joint with a positioning seat in the middle of a mounting groove, the butt joint plate and the mounting groove are pressed to be fixed in an interference mode, and locking nails with rubber coated surfaces penetrate through the butt joint plate and a plastic particle plate to be fixed, so that an inductance frame is added to a scrubbing brush assembly, the scrubbing brush assembly rectifies a circuit through an inductor when in use, and further components with rectification anti-interference functions are mounted on the scrubbing brush assembly with the same specification;

(5) this scrubbing brush assembly structure for automobile motor shifts up in the regulation hole through the pull rod to stir the rotating frame rotatory in the spout, and extrude the guide post through the inside spring leaf of through-hole, make the guide post during the jack of inserting into rotating frame one side downwards, weld the surface of enameled wire and conducting strip again, thereby make the inductance coils who has the rectification effect conveniently protect in this scrubbing brush assembly.

Drawings

FIG. 1 is a schematic structural diagram of a scrubbing brush assembly for an automotive electric machine according to the present invention;

FIG. 2 is a schematic structural view of a scrubbing brush assembly for an automotive electric motor according to the present invention;

FIG. 3 is a schematic perspective view of a brush holder of the scrubbing brush assembly structure for an automotive electric motor according to the present invention;

FIG. 4 is a schematic structural view of a brush holder cross section of the scrubbing brush assembly structure for an automotive electric motor according to the present invention;

FIG. 5 is a schematic rear view of a brush holder of the scrubbing brush assembly structure for an automotive electric motor according to the present invention;

FIG. 6 is a schematic structural view of a front cross-sectional view of an inductor frame of the scrubbing brush assembly structure for the automotive motor of the present invention;

FIG. 7 is a schematic structural view of a left-side cross section of an inductor yoke of the scrubber assembly structure for an automotive motor according to the present invention;

FIG. 8 is a schematic view of a portion A of a scrubbing brush assembly for a motor vehicle according to the present invention;

FIG. 9 is a schematic view of a portion of an enlarged structure at B in FIG. 4 of a scrubbing brush assembly for a vehicle motor according to the present invention;

FIG. 10 is a schematic view of a portion of an enlarged structure at C in FIG. 7 of a scrubbing brush assembly for an automotive electric machine according to the present invention.

In the figure: 1. a plastic particle board; 2. a conductive sheet; 3. a butt joint hole; 4. a brush holder; 5. a support plate; 6. connecting grooves; 7. a socket; 8. a long hole; 9. a carbon brush; 10. a first card slot; 11. a second card slot; 12. a limiting bulge; 13. inserting plates; 14. a snap ring; 15. an inductor frame; 16. a butt plate; 17. a limiting groove; 18. mounting grooves; 19. positioning seats; 20. locking nails; 21. a third card slot; 22. a magnetic core; 23. fixing the convex base; 24. enamelled wires; 25. a limiting frame; 26. a chute; 27. a rotating frame; 28. a jack; 29. a through hole; 30. a guide post; 31. a spring plate; 32. an adjustment hole; 33. a pull rod.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-10, the present invention provides a technical solution: a scrubbing brush assembly structure for an automobile motor comprises a plastic particle board 1, a conducting strip 2, a butt joint hole 3, a brush holder 4, a support plate 5, a connecting groove 6, a socket 7, a long hole 8, a carbon brush 9, a first clamping groove 10, a second clamping groove 11, a limiting bulge 12, an inserting plate 13, a clamping ring 14, an inductance frame 15, a butt joint plate 16, a limiting groove 17, an installing groove 18, a positioning seat 19, a locking nail 20, a third clamping groove 21, a magnetic core 22, a fixed convex seat 23, an enameled wire 24, a limiting frame 25, a sliding groove 26, a rotating frame 27, a jack 28, a through hole 29, a guide post 30, a spring piece 31, an adjusting hole 32 and a pull rod 33, wherein the conducting strip 2 is arranged inside the plastic particle board 1, the butt joint hole 3 is formed in the surface of the corner at four ends of the plastic particle board 1, the brush holder 4 is arranged on one,

support plates 5 are arranged on two sides of the brush holder 4, the support plates 5 are distributed at equal intervals, the support plates 5 are T-shaped, the size of the support plates 5 is matched with that of the connecting grooves 6, the support plates 5 and the connecting grooves 6 can be clamped and fixed, the brush holder 4 assembly can be molded and fixed, the connecting grooves 6 are formed between the brush holder 4 and the support plates 5, sockets 7 are arranged at two ends of the brush holder 4, the sockets 7 are inverted hook-shaped, the sockets 7 and the brush holder 4 are vertically distributed, the sockets 7 and the butt-joint holes 3 are in plug-in connection, the inverted hook-shaped sockets 7 can enable the brush holder 4 to be stably butt-jointed at the corners of the plastic particle boards 1, long holes 8 are formed in the surfaces, close to the adjacent side surfaces of the support plates 5, of the brush holder 4, carbon brushes 9 are connected inside the brush holder 4, first clamping grooves 10 are formed in the surfaces, close to the long holes, a second clamping groove 11 is formed in one side of the inner wall of the first clamping groove 10, the limiting protrusions 12 are arranged inside the long holes 8, the limiting protrusions 12 are symmetrically distributed about the center line of the carbon brush 9, an L-shaped structure is formed between the limiting protrusions 12 and the inserting plate 13, the width of the limiting protrusions 12 is matched with that of the long holes 8, so that the limiting protrusions 12 can prevent the carbon brush 9 from falling off when driving the carbon brush 9 to move in the brush holder 4, the limiting protrusions 12 are in butt joint with the first clamping groove 10 through the inserting plate 13, the limiting protrusions 12 are in butt joint with the second clamping groove 11 through the clamping rings 14, the clamping rings 14 are in semi-circular shapes, and the clamping rings 14 form a clamping structure between the second clamping grooves 11 and the carbon brush 9, so that the clamping rings 14 drive the limiting protrusions 12 to be assembled and fixed on two sides;

the inductance frame 15 is arranged on two sides of the plastic particle board 1, the two sides of the inductance frame 15 are provided with butt plates 16, the butt plates 16 and the inductance frame 15 are vertically distributed, and the butt plates 16 and the mounting grooves 18 are in interference fit, so that the inductance frame 15 can be stably assembled or disassembled on two sides of the plastic particle board 1 and separated from the plastic particle board, the middle part of the butt plate 16 is provided with a limiting groove 17, the limiting groove 17 is U-shaped, the size of the limiting groove 17 is matched with that of the positioning seat 19, the inductance frame 15 can be in positioning butt joint with the plastic particle board 1 through the limiting groove 17, the butt plate 16 is in butt joint with the mounting grooves 18 on the two side surfaces of the plastic particle board 1, the middle part of the mounting groove 18 is provided with the positioning seat 19, the positioning seat 19 is connected with the limiting groove 17 in the middle part of the butt plate 16, the butt plate 16 is fixed with the plastic particle board 1 through a locking nail 20, a third clamping groove 21 is formed in the middle of one side, away from the butt joint plate 16, of the inductance frame 15, a magnetic core 22 is arranged on the inner side of the inductance frame 15, two ends of the magnetic core 22 are in butt joint with the third clamping groove 21 through a fixed convex seat 23, and an enameled wire 24 is connected to the outer side of the magnetic core 22;

a limiting frame 25 is arranged on one side of the inductance frame 15, a sliding groove 26 is formed in one side, away from the limiting frame 25, of the inductance frame 15, the sliding groove 26 is movably connected with a rotating frame 27 through a rotating shaft, the thickness of the rotating frame 27 is matched with the width of the surface of the sliding groove 26, one side, close to the enameled wire 24, of the rotating frame 27 is of an arc-shaped structure, the rotating frame 27 is rotatably connected with the sliding groove 26, so that the rotating frame 27 can be supported at the bottom end of the enameled wire 24 in an anti-falling mode, an insertion hole 28 is formed in the surface, extending into one end of the sliding groove 26, of the rotating frame 27, a through hole 29 is formed in the inner side, close to the top end of the sliding groove 26, of the limiting frame 25, the guide post 30 is in butt joint with the through hole 29, the guide post 30 and the pull rod 33 are vertically distributed, the diameter of the guide post, the guide post 30 can be continuously butted in the jack 28 on one side of the rotating frame 27 through the extrusion of the spring piece 31, the top end of the guide post 30 is connected with the spring piece 31, one side of the limiting frame 25, which is close to the through hole 29, is provided with an adjusting hole 32, the height from the top end of the adjusting hole 32 to the top end of the pull rod 33 is greater than the depth of the jack 28, the width of the adjusting hole 32 is matched with the diameter of the pull rod 33, so that when the pull rod 33 moves up to the top end in the adjusting hole 32, the guide post 30 can be driven to be completely separated from the jack 28 on one side of the rotating frame 27, the pull rod 33 is connected inside the adjusting hole 32, and one end of the pull.

The working principle is as follows: when the scrubbing brush assembly structure for the automobile motor is used, firstly, the support plates 5 arranged at two sides of the brush holder 4 are in a T shape, the support plates 5 and the connecting grooves 6 are pressed to be clamped, so that the brush holder 4 is assembled and fixed, then the socket 7 in the shape of the barb at two ends of the brush holder 4 is inserted into the butt joint hole 3 on the surface of the plastic particle board 1, so that the socket 7 is reversely locked in the butt joint hole 3, otherwise, the socket 7 in the shape of the barb is pressed to drive the socket 7 to be separated from the butt joint hole 3, so that the brush holder 4 is stably assembled or disassembled on the plastic particle board 1, then the carbon brush 9 is inserted into the brush holder 4, the inserting plate 13 at one side of the limiting bulge 12 is inserted into the first clamping groove 10 from the outer side of the long hole 8, the limiting bulge 12 is pressed to drive the clamping ring 14 at one side far away from the inserting plate 13 to be clamped with the second clamping groove 11, so that when the carbon brush 9 stretches and contracts to, the carbon brush 9 can be prevented from being separated in a telescopic way, when the brush board assembly needs to meet different functions, the inductance frame 15 can be installed or disassembled on two sides of the plastic particle board 1, when the inductance frame 15 is installed, the U-shaped limiting groove 17 in the middle of the butt joint board 16 is butted with the positioning seat 19 in the middle of the installation groove 18, the butt joint board 16 and the installation groove 18 are pressed for interference fixation, then the locking nail 20 with the surface coated with glue penetrates through the butt joint board 16 and the plastic particle board 1 for fixation, so that the inductance frame 15 is added to the brush board assembly, when the brush board assembly is used, a circuit is rectified through inductance, the signal of an electronic element can reduce interference, the enameled wire 24 is wound on the outer side of the magnetic core 22, the two ends of the magnetic core 22 are in limiting clamping connection through the fixing convex seat 23 and the third clamping groove 21 on the inner wall of the butt joint board 16, the pull rod 33 is driven upwards, the pull rod 33 is moved upwards in the adjusting hole 32, the rotating frame 27 is driven to rotate in the sliding groove 26, when the pull rod is rotated to a proper angle, the spring piece 31 in the through hole 29 extrudes the guide post 30, the guide post 30 is downwards inserted into the insertion hole 28 on one side of the rotating frame 27, and then the enameled wire 24 and the surface of the conducting strip 2 are welded, so that the mounted inductance coil is protected by the limiting frame 25 and the rotating frame 27, and what is not described in detail in the description belongs to the prior art known by those skilled in the art.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.

Claims

1. The utility model provides a scrubbing brush assembly structure for automobile motor, includes plastic particle board (1), spacing arch (12), inductance frame (15) and guide post (30), its characterized in that: the interior of the plastic particle board (1) is provided with a conducting strip (2), the surfaces of the four corners of the plastic particle board (1) are provided with butt joint holes (3), one side of the plastic particle board (1) close to the butt joint holes (3) is provided with a brush holder (4), wherein,

support plates (5) are arranged on two sides of the brush holder (4), a connecting groove (6) is formed between the brush holder (4) and the support plates (5), sockets (7) are arranged at two ends of the brush holder (4), a long hole (8) is formed in the surface, close to the support plates (5), of one side of the brush holder (4), a carbon brush (9) is connected inside the brush holder (4), a first clamping groove (10) is formed in the surface, close to the long hole (8), of the carbon brush (9), a second clamping groove (11) is formed in one side of the inner wall of the first clamping groove (10), a limiting protrusion (12) is arranged inside the long hole (8), the limiting protrusion (12) is in butt joint with the first clamping groove (10) through an inserting plate (13), and the limiting protrusion (12) is in butt joint with the second clamping groove (11) through a clamping ring (14);

the inductance frame (15) is arranged on two sides of the plastic particle board (1), the two sides of the inductance frame (15) are provided with butt joint plates (16), the middle of each butt joint plate (16) is provided with a limit groove (17), the butt joint plates (16) are in butt joint with mounting grooves (18) on the surfaces of the two sides of the plastic particle board (1), the middle of each mounting groove (18) is provided with a positioning seat (19), the positioning seats (19) are connected with the limit grooves (17) in the middle of the butt joint plates (16), the butt joint plates (16) are fixed with the plastic particle board (1) through locking nails (20), the middle of one side, far away from the butt joint plates (16), of the inductance frame (15) is provided with a third clamping groove (21), the inner side of the inductance frame (15) is provided with a magnetic core (22), and the two ends of the magnetic core (22) are in butt joint with the third clamping groove (21) through fixed, the outer side of the magnetic core (22) is connected with an enameled wire (24);

one side of inductance frame (15) is provided with spacing (25), one side that spacing (25) were kept away from in inductance frame (15) has seted up spout (26), swing joint is carried out through pivot and rotating turret (27) in spout (26), jack (28) have been seted up on the surface that rotating turret (27) stretched into spout (26) one end, through-hole (29) have been seted up to spacing (25) top inboard that is close to spout (26), guide post (30) dock with through-hole (29), the top of guide post (30) is connected with spring leaf (31), regulation hole (32) have been seted up to one side that spacing (25) are close to through-hole (29), the internal connection of regulation hole (32) has pull rod (33), the one end and the guide post (30) of pull rod (33) are fixed.

2. The scrubber assembly structure for the automobile motor according to claim 1, wherein: the support plates (5) are distributed at equal intervals, the support plates (5) are T-shaped, and the size of the support plates (5) is matched with that of the connecting grooves (6).

3. The scrubber assembly structure for the automobile motor according to claim 1, wherein: the socket (7) is in a barb shape, the socket (7) and the brush holder (4) are vertically distributed, and the socket (7) and the butt joint hole (3) are in plug connection.

4. The scrubber assembly structure for the automobile motor according to claim 1, wherein: the limiting protrusions (12) are symmetrically distributed about the center line of the carbon brush (9), an L-shaped structure is formed between the limiting protrusions (12) and the inserting plate (13), and the width of the limiting protrusions (12) is matched with that of the long holes (8).

5. The scrubber assembly structure for the automobile motor according to claim 1, wherein: the clamping ring (14) is in a semicircular ring shape, and the clamping ring (14) forms a clamping structure between the second clamping groove (11) and the carbon brush (9).

6. The scrubber assembly structure for the automobile motor according to claim 1, wherein: the butt joint plate (16) and the inductance frame (15) are vertically distributed, and the butt joint plate (16) and the installation groove (18) are in interference fit.

7. The scrubber assembly structure for the automobile motor according to claim 1, wherein: the limiting groove (17) is U-shaped, and the size of the limiting groove (17) is matched with that of the positioning seat (19).

8. The scrubber assembly structure for the automobile motor according to claim 1, wherein: the thickness of the rotating frame (27) is matched with the width of the surface of the sliding chute (26), one side of the rotating frame (27) close to the enameled wire (24) is of an arc-shaped structure, and the rotating frame (27) is in rotary connection with the sliding chute (26).

9. The scrubber assembly structure for the automobile motor according to claim 1, wherein: the guide posts (30) and the pull rods (33) are vertically distributed, the diameters of the guide posts (30) are matched with those of the insertion holes (28), and the guide posts (30) form a telescopic structure through the spring pieces (31) and the through holes (29).

10. The scrubber assembly structure for the automobile motor according to claim 1, wherein: the height from the top end of the adjusting hole (32) to the top end of the pull rod (33) is larger than the depth of the insertion hole (28), and the width of the adjusting hole (32) is matched with the diameter of the pull rod (33).