Integrated brush motor with commutator and output shaft arranged in different directions

Abstract

The invention relates to an integrated brush motor with a commutator and an output shaft arranged in different directions, which is characterized in that a cylinder part of a front end cover is rotatably supported and matched with a rotor central shaft through two bearings, and an outer ring of the bearing at one end is positioned through a bearing positioning surface in an inner hole of the cylinder part; an inner ring of the bearing at the other end is positioned through a bearing positioning surface on the central shaft, a bearing inner ring gasket and a bearing inner ring spacer sleeve are sequentially arranged between the bearing at one end and the bearing at the other end, and a bearing outer ring gasket and a bearing outer ring spacer sleeve are sequentially arranged between the bearing at the other end and the bearing at one end; the outer part of the bearing at one end realizes inner ring compression of the bearing through an inner ring lock nut locked on the central shaft, and the bearing at the other end realizes outer ring compression through an outer ring lock nut connected to an inner hole of the cylinder part; the stator is sleeved outside the rotor in a clearance manner, one end of the stator is fixedly connected with the front end cover, and the brush carrier is coaxially fixed at the other end of the stator and is aligned with the commutator segments. According to the invention, the stability of the shafting supporting structure is ensured, and the electric brush carrier is convenient to disassemble and assemble.

Description

Technical Field

[0001] The invention belongs to the technical field of self-contained brushed motors, and relates to a self-contained brushed motor in which a commutator and an output shaft are placed in non-co-directional directions. Background Art

[0002] For brushed motors used in high-precision applications, the stability of their shaft support structure is not only related to the relatively consistent axial play and rotation accuracy of the motor output shaft, but also to whether the motor can still ensure the stability of the shaft support structure after passing through harsh environments such as vibration and high and low temperatures. In order to achieve high-precision control of brushed motors and reduce interference to the control system, it is required that the number of electric sparks generated by the brush block when the motor rotates should not only be small, but also the spark magnitude should be small, and the whole machine is required to have a relatively uniform static friction torque and a low starting voltage. Therefore, during the production process of the brushed motor, the brush holder needs to be installed on the stator, power is turned on to rotate the rotor, and the commutator segments on the rotor are used to run in the brush block for a long time. During the running-in period, the brush holder needs to be removed to adjust the brush spring and brush block in time. Through repeated operations, the working surface of the brush block can finally have a very low roughness and a relatively consistent brush spring pressure, thereby achieving fewer and smaller electric sparks when the whole machine is working, as well as a relatively uniform static friction torque and a low starting voltage. Therefore, the ease of disassembly during the running of the brush holder and the motor rotor commutator segments is directly related to the survival rate and production efficiency of the high-precision brush motor.

[0003] For a self-contained brushed motor where the commutator and output shaft are not placed in the same direction, the conventional whole machine structure is as follows Figure 1 As shown, it mainly includes a rotor 101, a front cover 102, a stator 103, a rear cover 104, a bearing 105, a commutator segment 106 and a brush holder 107.

[0004] This structure adopts a double-pivot double-single-phase fixing method on the shaft system. When conducting environmental tests such as vibration, high and low temperature, the axial load borne by the motor is transmitted to the bearing through the rotor shaft and borne by the ball and inner and outer rings of the bearing. During the test, it is very easy to cause irreversible damage to the bearing, which ultimately leads to a large deviation in the axial movement value of the motor output shaft before and after the test. At the same time, this structure is not conducive to the disassembly and installation of the brush holder during the production and commissioning of the motor. When the motor is run in for a long time and the brush holder is disassembled and assembled for adjustment, it is necessary to disassemble and assemble the rear end cover, bearing and locking parts together, which not only greatly affects the production efficiency of the motor, but also the graphite dust generated during the running of the brush block can easily contaminate the bearing and other key components, affecting product quality. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention proposes a self-contained brushed motor in which the commutator and the output shaft are placed in non-co-directional directions, which can ensure the stability of the shaft support structure and facilitate the disassembly and assembly of the brush holder during production and debugging.

[0006] The above-mentioned object of the present invention is achieved by the following technical solutions:

[0007] A self-contained brushed motor in which a commutator and an output shaft are placed in non-co-directional directions, comprising a front end cover, a rotor, an inner ring lock nut, a bearing inner ring gasket, a bearing inner ring spacing sleeve, a stator, a brush holder, an outer ring lock, two bearings, a bearing outer ring spacing sleeve, and a bearing outer ring gasket; the two bearings are respectively a first bearing and a second bearing;

[0008] The front end cover is composed of a cover body part and a cylindrical part, and the cylindrical part is integrally connected to a position on one side of the center of the cover body part; a center hole is arranged on the front end cover, and the center hole is composed of an inner ring lock nut insertion hole section, a bearing mounting hole section and an outer ring lock nut fixing hole section arranged in sequence along the axial direction; the transition surface between the inner ring lock nut insertion hole section and the bearing mounting hole section is a bearing positioning surface, and the inner ring lock nut insertion hole section is arranged at one end close to the cover body part;

[0009] The first bearing and the second bearing are respectively installed at both ends of the bearing installation hole section of the front end cover, the first bearing is in contact with the bearing positioning surface, a bearing inner ring gasket and a bearing inner ring spacing sleeve are arranged in sequence between the inner ring of the first bearing and the inner ring of the second bearing, and a bearing outer ring spacing sleeve and a bearing outer ring gasket are arranged in sequence between the outer ring of the first bearing and the outer ring of the second bearing, the outer ring lock nut and the outer ring lock nut fixing hole section on the front end cover form a threaded locking connection, and the outer ring lock nut presses the outer ring of the second bearing to axially press and fix the outer rings of the two bearings;

[0010] The rotor comprises a rotor sleeve, an iron core assembly, a winding coil and a commutator segment; the rotor sleeve is composed of an integrally formed central shaft portion and a sleeve portion connected to one end of the central shaft, the central shaft is composed of an inner shaft section and an outer shaft section, a bearing positioning surface is arranged at one end of the inner shaft section away from the outer shaft section; an external thread is arranged at one end of the inner shaft section close to the outer shaft section, and the shaft end portion constitutes the output end of the brushed motor; the iron core assembly is bonded to the outer surface of the sleeve portion, the winding coil is wound on the iron core assembly, the commutator segment is inserted into the iron core assembly slot, and is welded to the winding coil side; the rotor sleeve, the iron core assembly, the winding coil and the commutator segment are an integral structure by encapsulating epoxy resin glue;

[0011] The central axis of the rotor is inserted and supported in the bearing hole of the front cover assembly from one end of the outer ring lock nut, and the combined structural part of the shaft sleeve part, the core assembly, the winding coil and the commutator segment is sleeved on the outside of the cylindrical part of the front cover; the inner ring lock nut is threadedly connected with the external thread on the inner shaft end of the central shaft, and the inner ring lock nut presses the inner ring of the first bearing, so that the inner ring of the second bearing contacts the bearing positioning surface on the central shaft, so that the inner rings of the two bearings are pressed and fixed;

[0012] The stator gap is sleeved on the outside of the rotor, one end of the stator is fixedly connected to the cover part, the brush holder is coaxially fixed to the other end of the stator, and the brush holder is aligned with the outside of the commutator segment on the stator.

[0013] Moreover, an annular groove is arranged on one end of the cover body portion close to the cylindrical portion, and the end of the combined structural portion of the sleeve portion, the core assembly, the winding coil and the commutator segment extends into the annular groove.

[0014] Moreover, an annular positioning recess is arranged on the periphery of one side of the cover body where the annular groove is arranged, and one end of the stator forms a positioning match with the annular positioning recess of the front end cover and is fixedly connected with the front end cover by a circle of screws.

[0015] The advantages and positive effects of the present invention are:

[0016] 1. The central axis of the rotor of the present invention is supported in the cylinder of the end cover by bearings at both ends. The shaft system of the motor is fixed in the direction of the first bearing at the outer ring of the bearing through the bearing positioning surface, bearing outer ring gasket, bearing outer ring spacer sleeve and outer ring lock nut on the front end cover. At the same time, the shaft system of the motor is fixed in the direction of the second bearing at the outer ring of the bearing through the bearing positioning surface, bearing inner ring spacer sleeve, bearing inner ring gasket and inner ring lock nut on the central axis, thereby realizing the dual-support point bidirectional fixation of the shaft system structure of the brushed motor of the present invention. This axial support and fixation method ensures that when conducting environmental tests such as vibration, high and low temperature, the axial load borne by the motor is jointly borne by the central axis, bearing, inner and outer spacer sleeves, gaskets and lock nuts. The bearing is not easily damaged during the test, and the numerical change of the axial movement of the motor output shaft before and after the test is small.

[0017] 2. The present invention installs the brush holder in an exposed manner on one end of the stator by a circle of screws. With this installation method, when the brush holder is disassembled and assembled during the production and commissioning of the motor, there is no need to disassemble and assemble other parts at the same time. Compared with the existing structure, the disassembly and assembly workload and working hours are greatly saved, thereby improving the production efficiency of the motor.

[0018] 3. The present invention realizes the built-in hidden installation of the shaft system structure composed of parts such as the center shaft and bearings through the coaxial insertion cooperation of the cylindrical part of the front end cover and the rotor sleeve, which provides a certain degree of protection for the shaft system structure, ensures that the graphite dust generated during the running of the brush block is not easy to contaminate the bearing, and improves the product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The invention is a structural schematic diagram of an existing self-contained brushed motor in which a commutator and an output shaft are not placed in the same direction.

[0020] Figure 2is an overall longitudinal sectional view of the self-contained brushed motor of the present invention;

[0021] Figure 3 It is a structural schematic diagram of the front end cover of the self-contained brushed motor of the present invention;

[0022] Figure 4 It is a structural schematic diagram of the front end cover assembly of the self-contained brushed motor of the present invention;

[0023] Figure 5 It is a schematic structural diagram of the rotor of the self-contained brushed motor of the present invention. DETAILED DESCRIPTION

[0024] The structure of the present invention is further described below with reference to the accompanying drawings and by way of examples. It should be noted that the present examples are descriptive rather than restrictive.

[0025] A self-contained brushed motor with the commutator and output shaft placed in different directions, see Figure 2-5 , which is composed of a front end cover 202, a rotor 201, an inner ring lock nut 211, a bearing inner ring gasket 210, a bearing inner ring spacing sleeve 209, a stator 203, a brush holder 204, an outer ring lock nut 205, two bearings 206, a bearing outer ring spacing sleeve 207, and a bearing outer ring gasket 208. The two bearings are respectively a first bearing and a second bearing.

[0026] The front end cover is composed of a cover body part and a cylindrical part, and the cylindrical part is integrally connected to a position on one side of the center of the cover body part. A center hole is arranged on the front end cover, and the center hole is composed of an inner ring lock nut insertion hole section, a bearing mounting hole section 2022 and an outer ring lock nut fixing hole section 2023 arranged in sequence along the axial direction. The inner ring lock nut insertion hole section and the bearing mounting hole section are both light hole sections, and the aperture of the bearing mounting hole section is larger than the aperture of the inner ring lock nut insertion hole section. A bearing positioning surface 2021 is formed at one end of the bearing mounting hole section close to the inner ring lock nut insertion hole section, which is used to limit the outer ring of the bearing installed in this position. The outer ring lock nut fixing hole section is a threaded hole section provided with an internal thread. The inner ring lock nut insertion hole section is arranged at one end close to the cover body part.

[0027] An annular groove is provided on one end of the cover body near the cylindrical part, and an annular positioning recess is provided on the periphery of one side of the cover body where the annular groove is provided. The annular groove is used to insert the end of the main body of the rotor, so as to reduce the axial size of the self-contained brushed motor and realize the compactness of the overall structure. The annular positioning recess is used to realize the positioning of the stator.

[0028] The first bearing and the second bearing are installed at both ends of the bearing mounting hole section of the front end cover respectively. The first bearing contacts the bearing positioning surface. A bearing inner ring gasket and a bearing inner ring spacing sleeve are arranged in sequence between the inner ring of the first bearing and the inner ring of the second bearing. A bearing outer ring spacing sleeve and a bearing outer ring gasket are arranged in sequence between the outer ring of the first bearing and the outer ring of the second bearing. The outer ring lock nut forms a threaded locking connection with the outer ring lock nut fixing hole section on the front end cover. The outer ring lock nut presses the outer ring of the second bearing to achieve axial compression and fixation of the outer rings of the two bearings. The front end cover, two bearings, a bearing inner ring gasket, a bearing inner ring spacing sleeve, a bearing outer ring spacing sleeve, a bearing outer ring gasket and an outer ring lock nut form a front end cover assembly, such as Figure 4 shown.

[0029] The rotor includes a rotor sleeve, an iron core assembly, a winding coil and a commutator segment 2014. The rotor sleeve is composed of an integrally formed central shaft portion 2011 and a sleeve portion 2013 connected to one end of the central shaft. The central shaft is composed of an inner shaft section and an outer shaft section. The shaft diameter of the inner shaft section is consistent with the inner diameter of the two bearings. A bearing positioning surface 2012 is provided at one end of the inner shaft section away from the outer shaft section for positioning the inner ring of the second bearing. An external thread is provided at one end of the inner shaft section close to the outer shaft section for connection with the inner ring lock nut. The shaft end portion constitutes the output end of the brushed motor. The inner diameter of the sleeve portion is greater than the outer diameter of the cylindrical portion of the front end cover. The iron core assembly is bonded to the outer surface of the sleeve portion, and the winding coil is wound on the iron core assembly. The commutator segment is inserted into the iron core assembly slot and welded to the winding coil side. The rotor sleeve, the iron core assembly, the winding coil and the commutator segment are an integral structure by encapsulating epoxy resin glue.

[0030] The central axis of the rotor is inserted and supported in the bearing hole of the front cover assembly from one end of the outer ring lock nut, and the core assembly, winding coil and commutator are arranged in a position aligned with the annular groove on the front cover, so that the rotor is coaxially rotatably supported on the front cover assembly. The inner ring lock nut is threadedly connected with the external thread on the inner shaft end of the central shaft, and the inner ring lock nut presses the inner ring of the first bearing, so that the inner ring of the second bearing contacts the bearing positioning surface on the central shaft, thereby achieving the pressing and fixing of the inner rings of the two bearings.

[0031] The stator is sleeved on the outside of the rotor, one end of the stator forms a positioning match with the annular positioning recess of the front cover, and is fixedly connected to the front cover through a circle of screws. The brush holder is coaxially fixed to the other end of the stator through screws, and the brush holder is aligned with the outside of the commutator segment on the stator.

[0032] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A self-contained brushed motor in which the commutator and the output shaft are placed in non-co-directional directions, characterized in that: It includes a front end cover, a rotor, an inner ring lock nut, a bearing inner ring gasket, a bearing inner ring spacing sleeve, a stator, a brush holder, an outer ring lock, two bearings, a bearing outer ring spacing sleeve, and a bearing outer ring gasket; the two bearings are respectively a first bearing and a second bearing; The front end cover is composed of a cover body part and a cylindrical part, and the cylindrical part is integrally connected to a position on one side of the center of the cover body part; a center hole is arranged on the front end cover, and the center hole is composed of an inner ring lock nut insertion hole section, a bearing mounting hole section and an outer ring lock nut fixing hole section arranged in sequence along the axial direction; the transition surface between the inner ring lock nut insertion hole section and the bearing mounting hole section is a bearing positioning surface, and the inner ring lock nut insertion hole section is arranged at one end close to the cover body part; The first bearing and the second bearing are respectively installed at both ends of the bearing installation hole section of the front end cover, the first bearing is in contact with the bearing positioning surface, a bearing inner ring gasket and a bearing inner ring spacing sleeve are arranged in sequence between the inner ring of the first bearing and the inner ring of the second bearing, and a bearing outer ring spacing sleeve and a bearing outer ring gasket are arranged in sequence between the outer ring of the first bearing and the outer ring of the second bearing; the outer ring lock nut and the outer ring lock nut fixing hole section on the front end cover form a threaded locking connection, and the outer ring lock nut presses the outer ring of the second bearing to axially press and fix the outer rings of the two bearings; The rotor comprises a rotor sleeve, an iron core assembly, a winding coil and a commutator segment; the rotor sleeve is composed of an integrally formed central shaft portion and a sleeve portion connected to one end of the central shaft, the central shaft is composed of an inner shaft section and an outer shaft section, a bearing positioning surface is arranged at one end of the inner shaft section away from the outer shaft section; an external thread is arranged at one end of the inner shaft section close to the outer shaft section, and the shaft end portion constitutes the output end of the brushed motor; the iron core assembly is bonded to the outer surface of the sleeve portion, the winding coil is wound on the iron core assembly, the commutator segment is inserted into the iron core assembly slot, and is welded to the winding coil side; the rotor sleeve, the iron core assembly, the winding coil and the commutator segment are an integral structure by encapsulating epoxy resin glue; The central axis of the rotor is inserted and supported in the bearing hole of the front cover assembly from one end of the outer ring lock nut, and the combined structural part of the shaft sleeve part, the core assembly, the winding coil and the commutator segment is sleeved on the outside of the cylindrical part of the front cover; the inner ring lock nut is threadedly connected with the external thread on the inner shaft end of the central shaft, and the inner ring lock nut presses the inner ring of the first bearing, so that the inner ring of the second bearing contacts the bearing positioning surface on the central shaft, so that the inner rings of the two bearings are pressed and fixed; The stator gap is sleeved on the outside of the rotor, one end of the stator is fixedly connected to the cover part, the brush holder is coaxially fixed to the other end of the stator, and the brush holder is aligned with the outside of the commutator segment on the stator.

2. The self-contained brushed motor with the commutator and the output shaft placed in non-co-directional directions according to claim 1, characterized in that: An annular groove is arranged on one end of the cover body portion close to the cylindrical portion, and the end of the combined structural portion of the sleeve portion, the core assembly, the winding coil and the commutator segment extends into the annular groove.

3. The self-contained brushed motor with the commutator and the output shaft placed in non-co-directional directions according to claim 1, characterized in that: An annular positioning recess is arranged on the periphery of one side of the cover body where the annular groove is arranged. One end of the stator forms a positioning match with the annular positioning recess of the front end cover and is fixedly connected with the front end cover by a circle of screws.

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