CN203278491U

CN203278491U - Brush carrier assembly

Info

Publication number: CN203278491U
Application number: CN 201320265171
Authority: CN
Inventors: 胡淑斌; 刘才德; 徐文鑫
Original assignee: Techtronic Industries Co Ltd
Current assignee: Techtronic Industries Co Ltd
Priority date: 2013-05-15
Filing date: 2013-05-15
Publication date: 2013-11-06
Anticipated expiration: 2023-05-15

Abstract

The utility model provides a brush carrier assembly used for a motor. The assembly comprises a brush carrier, a brush cover disposed on the brush carrier and a fixing device detachably fixed with the brush carrier. The brush carrier comprises a first nested part. The fixing device comprises a second nested part. The first nested part is applicable to be connected with the second nested part, so that the fixing device can be detachably fixed with the brush carrier. Provided by the assembly, the brush carrier and the fixing device are jointed radially. Thus, the frictional force circumferentially applied to the brush carrier cannot lead to circumferential rotation of the brush carrier relative to the fixing device. In this way, the brush carrier can be tightly connected with the fixing device.

Description

Brush holder assemblies

Technical field

The utility model relates to motor, especially for the internal structure of the motor of hand held electric tool.

Background technology

The important intraware of one of them of motor is brush carrier, usually is equipped with spring and by spring, pressure is added on the carbon brush that contacts with commutator or collector ring surface sliding, makes its conduction current stably between the stator of motor and rotor.Can apply circumferential frictional force due to the motor rotor of High Rotation Speed when the contact carbon brush and give carbon brush, therefore the brush carrier of carbon brush has been installed fixed firmly, to avoid movement.

Showed the common a kind of fixed form of prior art center brush frame in Fig. 1 a-1c.Fixture one end of brush carrier is arcwall face 10, and the other end is handle 18.The projection 14 of extending along the holder length direction is arranged on the basal plane 16 at the rear of arcwall face, and the end that this projection 14 extends beyond arcwall face 10 forms barb 12.Has the arc-shaped protrusions 24 corresponding to arcwall face 10 on brush carrier.By fixture is engaged on the axial direction of brush carrier with brush carrier, the arc-shaped protrusions 24 on brush carrier can be fitted with the arcwall face 10 of fixture.Have in addition the barb 22 from its base portion to upper process on brush carrier 20, this barb can mesh the edge of arcwall face 10 when fixture is installed to brush carrier 20, thus locking fixer.As shown in Fig. 1 c, barb 12 is bitten arc-shaped protrusions 24 after fixture is installed to brush carrier 20, and barb 22 is bitten arcwall face 10.There are some shortcomings in such fixed form, for example due to fixture by the brush carrier of axially fitting, therefore circumferential displacement still might occur in brush carrier, for the operation of motor brings the factors of instability, even might produce the danger situation such as spark under rotor high-speed rotates.

The utility model content

Therefore, embodiment of the present utility model provides a kind of improved brush holder assemblies, can overcome above-mentioned technical problem, realizes the firm installation of brush carrier.

Therefore, one side of the present utility model provides a kind of brush holder assemblies for motor, the fixture that comprises brush carrier, is arranged on the electric brush cover on brush carrier and is detachably fixed to brush carrier is characterized in that described brush carrier comprises the first nested unit; Described fixture comprises the second nested unit; Wherein said the first nested unit is suitable for being connected with the second nested unit is nested, thereby described fixture is releasably attached on described brush carrier.

Preferably, described the first nested unit also comprises the first buckle assembly, and the second nested unit also comprises the second buckle assembly that is configured to the first buckle assembly engagement.In most preferred embodiment, described the first nested unit is the plug that is formed at described brush carrier surface, and the jag of described plug is outstanding along the radial outward of described brush carrier.Described plug has from parallel two gear shapings that stretch out of base portion; Be formed with respectively two barbs of its opposite direction at the end of these two gear shapings.

On the other hand, preferably the second nested unit described in the utility model is the socket that is formed at described fixture one end.The cross section of described socket is rectangle.Described socket has also formed hole with respect to forming two depressions on two corner positions of the end opposite of an end that receives plug on the surface of socket described in described depression.

Description of drawings

Remaining part and accompanying drawing with reference to this specification can be done further to understand to performance of the present utility model and advantage; In these accompanying drawings, the label of same assembly is identical.

Fig. 1 a and 1b have showed respectively a kind of fixture of brush carrier external member and the three-dimensional view of brush carrier in the prior art.

Fig. 1 c is the schematic diagram after fixture in Fig. 1 a and the combination of Fig. 1 b center brush frame are installed to together.

Fig. 2 is brush carrier in an embodiment in the utility model and the three-dimensional view of fixture, and brush carrier was connected with fixture and locked together this moment.

Fig. 3 a and 3b are the other three-dimensional views of Fig. 2 center brush frame and fixture, and this moment, brush carrier and fixture were separated.

Fig. 4 a-4d has showed the three-dimensional view of the different visual angles of the fixture shown in Fig. 2.

Fig. 5 is the three-dimensional view of the fixture in another embodiment in the utility model.

Fig. 6 is the three-dimensional view of the fixture in another embodiment in the utility model.

Embodiment

Embodiment of the present utility model has used the nested connected mode with buckle structure that brush carrier is fixed on fixture.Can learn easily from following narration different benefits and the advantage that each embodiment of the present utility model provides.

Referring to Fig. 2, disclosed a kind of brush holder assemblies for motor in an embodiment of the present utility model.The fixture that this brush holder assemblies comprises brush carrier, is arranged on the electric brush cover 40 on brush carrier and is detachably fixed to brush carrier.There are two at Fig. 2 center brush cover 40, even positioned opposite on the circumference of brush carrier.Also have wind spring 42 on the side of electric brush cover 40, be used for pressure is added in the carbon brush (not shown) that contacts with commutator or collector ring surface sliding, make its conduction current stably between the stator (not shown) of motor and rotor (not shown).Brush carrier comprises the first nested unit, particularly for being formed at the plug (not shown in Fig. 2) on described brush carrier surface.On the other hand, fixture comprises the second nested unit, and it is the socket 60 that is formed at described fixture one end.Because plug can be inserted in socket 60 and be fixed, therefore the first nested unit be suitable for the second nested unit between carry out nested the connection, thereby fixture is releasably attached on brush carrier.To describe more specifically this connected mode below.The other end of fixture is handle 64, and other parts that are used for fixture is connected to motor are casing for example.Connect by adjutage 62 between socket 60 and handle 64.Adjutage 62 as shown is the cuboid parts in this embodiment.

Forward now Fig. 3 a and 3b to, the state at this brush carrier and fixture after separately is revealed.At first can see, the jag of plug 66 is outstanding along the radial outward of described brush carrier.The length direction that is to say plug 66 is on the radial direction of brush carrier.Plug 66 has from parallel two gear shapings that stretch out of base portion, is formed with respectively two barbs 68 of its opposite direction at the end of these two gear shapings.The barb 68 first buckle assembly that here is otherwise known as.

Accordingly, can see socket 60 in fixture has and is roughly rectangular cross section, and at two corner positions of socket 60 with respect to the end opposite of an end that receives plug 66, formed two depressions, further formed hole 70 on the surface of socket 60 in these depressions.Depression and the hole 70 second buckle assembly that here is otherwise known as together.Gear shaping on plug 66 recited above be used for to insert the socket 60 of fixture, and barb 68 is used for the hole edge of socket 60 on occlusion fixator, thus make plug 66 nested and insert socket 60 fully after, can mesh socket 60.If plug 66 need to be withdrawed from and being connected of socket 60, only need to make barb 68 break away from the edge of holes 78 and get back in the internal cavities of socket 60 to the reciprocal active force that barb 68 applies its interlock.

Above-mentioned structure makes plug 66 and socket 60 can mutually combine easily in the radial direction or separating at brush carrier.The footpath that is in brush carrier due to such connection is upwards rather than axially, even therefore brush carrier is because rotor motion has been subject to axial power, brush carrier can not produce any displacement with respect to fixture because this axial force engages on length direction afterwards perpendicular to plug 66 and socket 60 yet, can't make plug 66 and socket 60 produce relative displacements.

The outward appearance that Fig. 4 a-4d shows respectively socket 60 from different perspectives with and the shape of internal cavities, the internal cavities that can observe socket 60 is roughly rectangular shape.

The structure of fixture in another embodiment in the utility model that shows in Fig. 5.Can see that for the fixture shown in Fig. 2-Fig. 4 d, the adjutage 162 of the fixture in Fig. 5 is no longer rectangular shape, but have two bends 163.What show in Fig. 6 is the structure of fixture in another embodiment in the utility model.For the fixture shown in Fig. 5, the length of adjutage 262 on one section of the fixture in Fig. 6 is long significantly, and this is in order to coordinate the needs of different internal structure of motor size design.Those skilled in the art can understand that the adjutage of fixture can also have the bend more than two, and the total length of adjutage also can change according to different electric machine structure design needs.

Therefore, after having introduced several embodiment, those skilled in the art will recognize that different changes, other structure, equivalent, can be used and can not deviate from essence of the present utility model.Accordingly, above description should not be regarded as the restriction as the following determined the utility model scope of claim.

Claims

1. brush holder assemblies that is used for motor, the fixture that comprises brush carrier, is arranged on the electric brush cover on brush carrier and is detachably fixed to brush carrier is characterized in that:

Described brush carrier comprises the first nested unit;

Described fixture comprises the second nested unit;

Wherein said the first nested unit is suitable for being connected with the second nested unit is nested, thereby described fixture is releasably attached on described brush carrier.

2. brush holder assemblies according to claim 1, it is characterized in that: described the first nested unit also comprises the first buckle assembly, the second nested unit also comprises the second buckle assembly that is configured to the first buckle assembly engagement.

3. brush holder assemblies according to claim 1 and 2, it is characterized in that: described the first nested unit is the plug that is formed at described brush carrier surface.

4. brush holder assemblies according to claim 3 is characterized in that: the jag of described plug is outstanding along the radial outward of described brush carrier.

5. brush holder assemblies according to claim 3, it is characterized in that: described plug has from parallel two gear shapings that stretch out of base portion; Be formed with respectively two barbs of its opposite direction at the end of these two gear shapings.

6. brush holder assemblies according to claim 1 and 2, it is characterized in that: described the second nested unit is the socket that is formed at described fixture one end.

7. brush holder assemblies according to claim 6, it is characterized in that: the cross section of described socket is rectangle.

8. brush holder assemblies according to claim 6, is characterized in that: form two depressions on two corner positions of described socket with respect to the end opposite of an end of reception plug, also formed hole on the surface of socket described in described depression.

9. brush holder assemblies according to claim 6, it is characterized in that: the described fixture other end is handle.

10. brush holder assemblies according to claim 9, it is characterized in that: connect by adjutage between described handle and described socket, described adjutage has two or more bends.