Brush assembly and motor comprising same

Abstract

The utility model relates to an electric brush assembly and a motor comprising the same. The electric brush assembly comprises an electric brush, a sliding sleeve capable of containing the electric brush in a sliding mode, a compression spring and an adjusting rod. The compression spring is arranged between the adjusting rod and the electric brush in a compressed mode. The adjusting rod comprises an adjusting rod main body and a first locking part; the adjusting rod main body and the electric brush are connected in a manner that the adjusting rod main body and the electric brush cannot rotate relatively but can move relatively in the axial direction; and a second locking part is arranged on the inner side wall of the sliding sleeve. And the adjusting rod can translate towards the electric brush relative to the sliding sleeve along the axial direction of the adjusting rod under the action of external force, so that the first locking part can be jointed with the second locking part at different axial positions of the second locking part, and the pressing force acting on the electric brush is adjusted. By adopting the electric brush assembly, the compression amount of the compression spring can be always in an optimal range, the reliability of the electric brush is improved, and the service life of the electric brush is prolonged; by arranging the brush service life indicating structure, the actual abrasion condition of the brush can be checked in real time, and the brush can be replaced in time.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field especially relates to a brush assembly and including the brush assembly's motor. BACKGROUND

[0002] The brush -slip ring structure as the key part of brush motor is the device between the fixed part and the rotating part of rotary machinery and transmits energy. The brush is in contact with the spring at one end in the work, thereby using the spring to press the brush, makes the other end of the brush and the slip ring surface of high -speed rotation contact, both are in the state of sliding friction. However, because the brush is under the influence of high -speed friction and current flow with the slip ring will wear out constantly, leading to the brush wear and tear short, the compression force of the spring received will decrease constantly. When the compression force is insufficient, will cause the brush and the slip ring between contact not real, resistance increases, leads to heat seriously and produces electric spark (even burns down), greatly reduces the service life of the brush.

[0003] The known solution in the prior art is to set the initial compression force of the spring to be higher than the optimal range of the compression force to alleviate the problem of insufficient compression force of the brush after wear. However, if the initial compression force is set to be higher, it will cause the brush to wear too fast in the early stage of use, and it may also increase the risk of breaking of the brush due to excessive pressure. In addition, since the brush is installed in the brush slip sleeve inside the motor, it is difficult to observe the wear state of the brush, so when maintaining the brush, it is impossible to make preparations for repair and replacement in advance according to the actual wear condition of the brush. SUMMARY

[0004] The utility model discloses at least one problem and / or other problems existing in the prior art.

[0005] According to one aspect of the utility model, it provides a brush assembly, the brush assembly includes the brush, the slip sleeve for slidably receiving the brush and the compression spring for pressing the brush to the slip ring, the brush assembly further includes the adjusting rod, and the compression spring compression is arranged between the adjusting rod and the brush, the adjusting rod includes the adjusting rod main part and the first locking portion that sets up on the adjusting rod main part, the adjusting rod main part with the brush is connected with each other and can not rotate but can move relatively in the axial direction, the second locking portion is arranged on the inner side wall of the slip sleeve, the adjusting rod can be translated along the axial direction thereof relative to the slip sleeve towards the brush under the action of external force, so that the first locking portion can be engaged with the second locking portion at different axial positions of the second locking portion, thereby adjusting the compression force of the compression spring acting on the brush.

[0006] As an embodiment of the present application, the sliding sleeve comprises a first axial portion and a second axial portion connected to each other; the first axial portion is defined with an open first end and a first inner cavity in communication with the first end, and the brush is slidably received in the first inner cavity; the second axial portion is defined with a second end with a central opening and a second inner cavity in communication with the central opening and the first inner cavity, and the second locking portion is arranged on the inner side wall of the second inner cavity.

[0007] As an embodiment of the present application, the adjusting rod body comprises an indicating rod portion extending through the central opening, and the indicating rod portion comprises a pressing head allowing the external force to be applied and a brush life indicating structure.

[0008] As an embodiment of the present application, the brush life indicating structure comprises a scale for indicating the remaining life of the brush.

[0009] As an embodiment of the present application, an annular sealing member is arranged between the sliding sleeve and the indicating rod portion at the central opening.

[0010] As an embodiment of the present application, the adjusting rod body further comprises a limiting rod portion provided with a limiting end, and a limiting recess with a rotation-stopping surface is arranged on the top surface of the brush, and the limiting end and the limiting recess are engaged with each other in a shape-matching manner.

[0011] As an embodiment of the present application, the limiting recess is semicircular.

[0012] As an embodiment of the present application, the first locking portion comprises a plurality of locking claws arranged at intervals along the circumferential direction of the adjusting rod body, and the second locking portion comprises a locking tooth portion arranged on the inner side wall of the sliding sleeve.

[0013] As an embodiment of the present application, the locking tooth portion comprises a plurality of tooth portion segments arranged at intervals along the circumferential direction of the inner side wall of the sliding sleeve and corresponding to the plurality of locking claws, and a gap is formed between every two adjacent tooth portion segments.

[0014] As another aspect of the present application, a motor is provided, which comprises the brush assembly as described above.

[0015] The brush assembly according to the utility model can keep the compression amount of the compression spring of the brush in the optimal range, thereby avoiding the risk of the brush wearing too fast or the brush breaking due to the too high initial compression force in the prior art, and various problems caused by the insufficient compression force of the brush in the later period due to the imperfect contact between the brush and the slip ring, greatly increasing the working reliability and service life of the brush; in addition, the brush life indication structure (for example, an indication scale for indicating the remaining life of the brush) is arranged on the adjusting rod in the brush assembly, so that the actual wear condition of the brush can be conveniently and timely viewed, the brush can be timely replaced, and the downtime during maintenance is shortened. BRIEF DESCRIPTION OF DRAWINGS

[0016] The features and advantages of the present utility model will be understood by the following detailed description in conjunction with the accompanying drawings. It should be understood that the following drawings are merely schematic and not necessarily drawn to scale, and therefore should not be considered limiting of the present utility model, in which:

[0017] Figure 1 is a sectional view of the brush assembly according to an embodiment of the present utility model;

[0018] Figure 2 is Figure 1 a partial enlarged view of part A in

[0019] Figure 3 is a perspective view of an adjusting rod included in the brush assembly shown in Figure 1 ;

[0020] Figure 4 is a perspective view of a sliding sleeve included in the brush assembly shown in Figure 1 ;

[0021] Figure 5 is a perspective view of a brush included in the brush assembly shown in Figure 1 . DETAILED DESCRIPTION

[0022] Embodiments of the present utility model are described below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. It will be apparent, however, to one skilled in the art, that the present utility model can be practiced without some or all of these specific details. In other instances, well known process steps have not been described in detail in order not to unnecessarily obscure the present utility model. In addition, it is to be understood that the present utility model is not limited in its application to the specific details of construction and the arrangement of components set forth in the following description. The present utility model is capable of other embodiments and of being practiced or being carried out in various ways. Also, it is to be understood that the terminology and phraseology employed above are for purpose of description and illustration only and are not intended to be limiting.

[0023] In the following, terms such as "first", "second" and the like are used to describe elements of the present application, which are merely intended to distinguish one element from another, rather than to limit the nature, sequence or number of the elements. The terms "comprising" and "having" are used to mean an open-ended inclusion, and refer to the possibility that additional elements / components can be present in addition to the listed elements / components.

[0024] The utility model discloses an improved brush assembly to solve the problems existing in prior art, which avoids the brush problems caused by improper brush pressing force in prior art, and through the brush service life indication structure, the maintenance of the brush is more timely and convenient.

[0025] Figure 1 is the sectional view of the brush assembly according to the utility model embodiment. The brush assembly 1 includes a brush 11 intended to be in contact with a slip ring 2 and a sliding sleeve 12 for slidably receiving the brush 11. It should be known that the pressing force between the brush 11 and the slip ring 2 cannot be too large or too small, if the pressing force is not enough, it will easily cause unstable signal transmission, and if the pressure is too large, it will cause the wear of the brush to increase, resulting in the service life of the brush being shortened. According to the brush assembly of the utility model, the pressing force between the brush and the slip ring can always be kept within the optimal range, improving the working reliability and service life of the brush.

[0026] The brush assembly can further include an adjusting rod 13 and a compression spring 14 arranged between the adjusting rod 13 and the brush 11, which presses the brush 11 against the contact surface of the slip ring 2 with a pressing force. According to Figure 1 In the exemplary embodiment shown, the adjusting rod 13 includes an adjusting rod body and a first locking portion arranged on the adjusting rod body, and the adjusting rod body is connected with the brush 11 in a manner that they cannot rotate relative to each other but can move relative to each other in the axial direction. A second locking portion is arranged on the sliding sleeve 12.

[0027] Unlike the prior art scheme of adjusting the brush pressing force by adjusting screw rod or adjusting screw, the adjusting rod in the utility model can translate relative to the sliding sleeve towards the brush along its axial direction under the action of external force (for example, by the user performing a pressing action), so that the first locking portion can engage with the second locking portion at different axial positions of the second locking portion, thereby adjusting the pressing force of the compression spring acting on the brush. By using the brush assembly according to the utility model, the pressing force adjusting method is more convenient.

[0028] Still referring to Figure 1The sliding sleeve 12 includes a first axial portion 12a and a second axial portion 12b connected to each other, the first axial portion 12a being defined with an open first end 121 and a first inner cavity 122 communicating with the first end 121, the brush 11 being slidably received in the first inner cavity 122. The second axial portion 12b is defined with a second end 124 with a central opening 123 and a second inner cavity 125 communicating with the central opening 123 and the first inner cavity 122. The second locking portion is provided on an inner side wall of the second inner cavity 125. The first locking portion provided on the adjusting rod body can include a plurality of locking claws 133 arranged at intervals in a circumferential direction of the adjusting rod body, and the second locking portion provided on the inner side wall of the second inner cavity can include a locking tooth portion provided on the inner side wall.

[0029] As an embodiment, the locking tooth portion can be a continuous tooth portion arranged in a whole circle in the circumferential direction of the inner side wall of the sliding sleeve.

[0030] As an alternative embodiment, especially referring to Figure 2 and Figure 4 In this embodiment, the locking tooth portion is a plurality of tooth portion segments 126 arranged at intervals in the circumferential direction of the inner side wall of the sliding sleeve 12 (especially the second inner cavity 125), corresponding to the plurality of locking claws 133, and a gap 127 is formed between every two adjacent tooth portion segments 126. In this way, the adjusting rod of the brush assembly can be more conveniently installed.

[0031] For example, when the adjusting rod 13 is installed into the sliding sleeve 12 from bottom to top, the locking claws 133 on the adjusting rod 13 can be aligned with the corresponding gaps 127 and extended into the sliding sleeve 12, and after the adjusting rod 13 is slid into place, the adjusting rod 13 is rotated to be engaged into the corresponding tooth portion segments 126 on the inner side wall. Of course, it should be understood that other forms of locking structures known in the art are also possible, as long as the locking manner and function intended to be achieved herein can be achieved.

[0032] Continuing to refer to Figure 3It shows the adjusting rod according to the embodiment of the utility model. As described above, the adjusting rod 13 is an integral piece, which comprises an adjusting rod main body and four locking claws 133 extending from the adjusting rod main body, especially arranged in a cross shape. The adjusting rod main body comprises an indicating rod part 131 extending through the center opening 123 and a limiting rod part 132 provided with a limiting end 1321. The indicating rod part 131 comprises a pressing head 1311 allowing external force to be applied and a brush life indicating structure 1312, such as a scale for indicating the remaining life of the brush and a replacement reminder. The limiting end 1321 on the limiting rod part 132 is intended to be in shape cooperation with the limiting recess 111 of the stop surface 1111 provided on the top surface of the brush 11, so that the adjusting rod 13 can be engaged to the brush 11 through the limiting end 1321. The compression amount of the compression spring 14 is determined by the length of the limiting end 1321. In this way, by reasonably designing the length of the limiting end, it can be ensured that the compression amount of the compression spring is always within the optimal range.

[0033] The limiting end 1321 and the limiting recess 111 are provided, which on the one hand limits the rotation of the adjusting rod 13, and on the other hand also limits the maximum pressing amount of the adjusting rod 13 downwards. Figure 5 As shown, the limiting recess 111 is semicircular. Of course, limiting recesses of other shapes are also feasible, as long as the limiting and anti-rotation effects intended to be achieved in this paper can be achieved.

[0034] In order to facilitate adjustment, the brush assembly according to the utility model is arranged to be exposed outside the motor. In order to ensure the sealing of the inner cavity space of the sliding sleeve 12, a sealing element is arranged between the sliding sleeve 12 and the adjusting rod 13. Specifically, Figure 2 As shown, an annular sealing element 15 is arranged at the indicating rod part 131 of the adjusting rod 13 and the center opening 123 of the second end 124 of the sliding sleeve 12. The arrangement of the sealing element is advantageous because it can prevent water and / or dust from entering the inner cavity to avoid the wear and blockage of the carbon brush caused by dust and the brush leakage problem caused by the infiltration of water, thereby improving the working reliability of the brush.

[0035] Industrial applicability

[0036] The brush assembly according to the utility model can be applied to brush motors (such as including brush motors and brush generators), which can increase the reliability and service life of the brush by keeping the compression amount of the compression spring within the optimal range, and can view the actual wear condition of the brush in real time by arranging the brush life indicating structure, and replace the brush in time.

[0037] When the brush assembly is initially assembled with the slip ring, the adjusting rod of the brush assembly is initially at the uppermost end of the sliding sleeve, at which time the scale on the indicating rod portion shows "100% of the remaining life of the brush", and the compression spring is at its optimal compression length range. As time passes, the brush gradually wears, causing the length of the brush to continuously shorten, the compression spring to slowly extend, and the compression force acting on the brush to continuously decrease. In the scheme of the locking pawl and the locking tooth portion according to the present application, the locking tooth portion includes a plurality of wedge-shaped teeth (see Figure 2 ) connected in the axial direction. When the length of the brush wears more than the distance of more than one tooth, at which time the adjusting rod is pressed down to move the adjusting rod axially downward until the limiting end of the limiting rod portion abuts against the bottom of the limiting recess of the brush, until it cannot continue to move downward. At this time, after the operator releases his hand, the adjusting rod will be lifted upward under the action of the compression spring until the wedge-shaped pawl on the adjusting rod is buckled on the nearest tooth, and the adjusting rod will be kept at this axial position and stop moving upward. In this way, the compression spring is readjusted to the optimal compression length range. At the same time, the operator can confirm the current remaining life of the brush by checking the scale on the indicating rod portion. Preferably, the spacing between the teeth on the sliding sleeve can be designed appropriately so that only a direct pressing operation is required during quarterly or annual maintenance.

[0038] Various modifications and variations to the disclosed embodiments of the present application can be made without departing from the scope or spirit of the present application. Other embodiments of the present application will be apparent from consideration of the specification and practice of the present application disclosed herein. For example, it will be apparent to one of skill in the art that the application can be practiced without the specific details set forth above. Further, it will be apparent that various implementations utilizing the principles of the present application can be achieved with less than all the features set forth above. It is the intent, therefore, to be limited only by the scope of the appended claims and their equivalents.

Claims

1. A brush assembly, the brush assembly (1) comprising a brush (11), a sleeve (12) for slidably receiving the brush (11), and a compression spring (14) for pressing the brush (11) against a slip ring (2), characterized in that, The brush assembly further includes an adjusting rod (13), and the compression spring (14) is compressed between the adjusting rod (13) and the brush (11); the adjusting rod (13) includes an adjusting rod body and a first locking part disposed on the adjusting rod body, and the adjusting rod body and the brush (11) are connected in a manner that prevents them from rotating relative to each other but allows them to move relative to each other in the axial direction; a second locking part is disposed on the inner side wall of the sliding sleeve (12); The adjusting rod (13) can be translated along its axial direction relative to the sliding sleeve (12) toward the brush (11) under the action of external force, so that the first locking part can engage with the second locking part at different axial positions of the second locking part, thereby adjusting the clamping force of the clamping spring (14) on the brush (11).

2. The brush assembly according to claim 1, characterized in that, The sliding sleeve (12) includes a first axial portion (12a) and a second axial portion (12b) connected to each other; the first axial portion (12a) defines an open first end (121) and a first inner cavity (122) communicating with the first end, and the brush (11) is slidably received in the first inner cavity (122); the second axial portion (12b) defines a second end (124) with a central opening (123) and a second inner cavity (125) communicating with the central opening (123) and the first inner cavity (122), and a second locking part is provided on the inner wall of the second inner cavity.

3. The brush assembly according to claim 2, characterized in that, The main body of the adjustment lever includes an indicator rod portion (131) extending through the central opening (123), the indicator rod portion (131) including a pressing head (1311) that allows the external force to be applied and a brush life indicator structure (1312).

4. The brush assembly according to claim 3, characterized in that, The brush life indicator structure (1312) includes a scale for indicating the remaining life of the brush.

5. The brush assembly according to claim 3, characterized in that, An annular seal (15) is provided at the central opening (123) between the sliding sleeve (12) and the indicator rod portion (131).

6. The brush assembly according to any one of claims 3 to 5, characterized in that, The main body of the adjusting rod also includes a limiting rod portion (132) with a limiting end (1321), and a limiting recess (111) with an anti-rotation surface (1111) is provided on the top surface of the brush (11). The limiting end (1321) and the limiting recess (111) are engaged with each other in a shape-matching manner.

7. The brush assembly according to claim 6, characterized in that, The limiting notch (111) is semi-circular.

8. The brush assembly according to any one of claims 1 to 5, characterized in that, The first locking part includes a plurality of locking claws (133) arranged at intervals from each other along the circumferential direction of the adjusting rod body, and the second locking part includes locking teeth provided on the inner sidewall of the sliding sleeve (12).

9. The brush assembly according to claim 8, characterized in that, The locking teeth include a plurality of tooth segments (126) spaced apart from each other along the circumferential direction of the inner sidewall of the sliding sleeve (12) and corresponding to the plurality of locking claws (133), with a notch (127) formed between every two adjacent tooth segments.

10. An electric motor, characterized in that, The motor includes a brush assembly (1) according to any one of claims 1 to 9.

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