Double-wire-system starter brush holder

Abstract

The utility model provides a double-wire starter brush holder, which comprises a rear cover, a brush holder bottom plate, a cathode carbon brush lead and a main cathode connector, the brush carrier bottom plate is mounted on the rear cover; a negative electrode carbon brush wire is arranged on one side, deviating from the rear cover, of the brush holder bottom plate, and is electrically conducted with the brush holder bottom plate; the main negative electrode connector is arranged on the brush holder bottom plate and is electrically connected with the negative electrode carbon brush wire through the brush holder bottom plate. According to the utility model, the brush holder bottom plate is installed on the rear cover, the negative electrode carbon brush wire and the negative electrode connector are directly connected to the brush holder bottom plate, and the negative electrode carbon brush wire and the negative electrode connector are electrically conducted and connected through the brush holder bottom plate, so that the limitation of the position relation is eliminated, the structural arrangement is simplified, the assembly is convenient, and the requirement that the negative electrode of a double-wire system is not grounded is met; and meanwhile, the length of the cathode carbon brush wire is shortened, and the part cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to starter brush holder technical field, concretely relates to a double line starter brush holder. BACKGROUND

[0002] The traditional structure of the brush holder of the double line starter adopts the mode that the negative pole bolt is directly welded with two carbon brush copper braids of the negative pole carbon brush, the negative pole carbon brush and the negative pole bolt are connected together, the negative pole conduction is carried out, the negative pole bolt is a kind of mode of negative pole export end, and the above mode does not contact the brush holder or shell, meets the demand of negative pole not grounding.But, the above connection mode can cause that the length of one copper braid is too long or the length of two copper braids is too long.For example, Chinese patent 201320232888.2 discloses a brush holder, including bottom plate, positive pole brush and negative pole brush installed on the epoxy bottom plate, positive pole brush box located at the end of the positive pole brush and negative pole brush box located at the end of the negative pole brush and positive pole lead-out line from the positive pole brush box and negative pole lead-out line from the negative pole brush box.

[0003] For the above prior art, in order to meet the demand of negative pole not grounding, short-circuit grounding caused by the contact between negative pole and shell needs to be avoided, therefore, the distance between the insulating negative pole bolt\negative pole export end and two negative pole carbon brushes is far, leading to that the position relationship arrangement is limited, and the assembly difficulty also rises, for example, the length of copper braid connecting negative pole bolt\negative pole export end and negative pole carbon brush is long, and needs nylon binding tape binding or buckle positioning. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at overcoming the above technical deficiencies, and provides a double line starter brush holder, to solve the technical problem that, in prior art, in order to meet the demand of negative pole not grounding, short-circuit grounding caused by the contact between negative pole and shell needs to be avoided, therefore, the distance between the insulating negative pole bolt\negative pole export end and two negative pole carbon brushes is far, leading to that the position relationship arrangement is limited, and the assembly difficulty also rises.

[0005] To achieve the above technical purpose, the utility model adopts the following technical scheme:

[0006] The utility model provides a double line starter brush holder, which comprises:

[0007] Rear cover;

[0008] Brush holder bottom plate, which is insulatively installed on the rear cover;

[0009] Negative pole carbon brush lead wire, which is arranged on the side of the brush holder bottom plate away from the rear cover and is electrically conductive with the brush holder bottom plate;And

[0010] A main negative electrode connector is arranged on the brush holder base plate and is electrically connected to the negative electrode carbon brush through the brush holder base plate.

[0011] In some embodiments, an insulating assembly is arranged between the brush holder base plate and the rear cover to insulate the main negative electrode connector and the brush holder base plate from the rear cover.

[0012] In some embodiments, the insulating assembly includes an insulating pad arranged between the brush holder base plate and the inner wall of the rear cover and an insulating sleeve arranged on the outside of the main negative electrode connector.

[0013] In some embodiments, a positioning member is arranged between the rear cover and the brush holder base plate to limit the sliding of the brush holder base plate relative to the inner bottom wall of the rear cover.

[0014] In some embodiments, the positioning member includes a plurality of insulating protrusions fixed on the brush holder base plate, and the rear cover is provided with a positioning groove corresponding to each of the insulating protrusions.

[0015] In some embodiments, the rear cover is provided with a first through hole for the main negative electrode connector to pass through, and the insulating sleeve is arranged on the inside of the first through hole and has a stepped surface abutting against the side of the rear cover away from the brush holder base plate.

[0016] In some embodiments, a locking member is arranged between the brush holder base plate and the rear cover to lock the brush holder base plate on the rear cover.

[0017] In some embodiments, the locking member includes a nut threadedly connected to the main negative electrode connector and abutting against the insulating sleeve, and the brush holder base plate and the stepped surface of the insulating sleeve press the inner and outer sides of the rear cover, respectively, to form the mounting and locking of the brush holder base plate.

[0018] In some embodiments, the rear cover is provided with a second through hole, the brush holder base plate is provided with a secondary negative electrode connector, the secondary negative electrode connector is arranged on the inside of the second through hole, and the secondary negative electrode connector is insulated from the rear cover by the insulating assembly.

[0019] In some embodiments, the main negative electrode connector and the secondary negative electrode connector are both negative electrode bolts.

[0020] Compared with the prior art, the dual-wire starter brush holder provided by this utility model is mounted on the rear cover through the brush holder base plate, and the negative carbon brush wire and the negative connector are directly connected to the brush holder base plate. The negative carbon brush wire and the negative connector are electrically connected through the brush holder base plate, which removes the limitation of positional relationship, simplifies the structural layout, facilitates assembly, meets the requirement of dual-wire negative non-grounding, shortens the length of the negative carbon brush wire, reduces parts cost, avoids the need for additional positioning of the negative carbon brush wire during assembly, and facilitates mass production on site using tooling. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the dual-wire starter brush holder provided in this embodiment of the utility model;

[0022] Figure 2 This is a three-dimensional exploded view of the dual-wire starter brush holder provided in this embodiment of the utility model;

[0023] Figure 3 This is a schematic diagram of the elevation angle of the rear cover separation of the dual-wire starter brush holder provided in this embodiment of the utility model;

[0024] Figure 4 This is a schematic diagram of the downward angle separation of the rear cover of the dual-wire starter brush holder provided in this embodiment of the utility model;

[0025] Figure 5 This is a top view of the dual-wire starter brush holder provided in this embodiment of the utility model.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Back cover; 101. First through hole; 102. Second through hole; 2. Brush holder base plate; 3. Negative carbon brush wire; 3a. Negative carbon brush; 3b. Spring; 3c. Brush box; 4. Main negative terminal connector; 5. Insulation assembly; 51. Insulation pad; 52. Insulation kit; 52a. Stepped surface; 6. Positioning component; 61. Insulation protrusion; 62. Limiting groove; 7. Locking component; 71. Nut; 8. Secondary negative terminal connector. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0029] To address the technical challenge of limiting the placement of negative electrode components and increasing assembly difficulty due to the need to avoid short circuits caused by contact between the negative electrode and the housing in order to meet the requirement of ungrounded negative electrode, the present invention provides a dual-wire starter brush holder. This holder is mounted on the rear cover via a base plate, directly connecting the negative electrode carbon brush wires and the negative electrode connector to the base plate. The base plate electrically connects the negative electrode carbon brush wires and the negative electrode connector, while an insulating component isolates the main negative electrode connector and the base plate from the rear cover. This satisfies the requirement of ungrounded negative electrode in a dual-wire system, shortens the length of the negative electrode carbon brush wires, reduces component costs, avoids additional positioning of the negative electrode carbon brush wires during assembly, and facilitates mass production using tooling on-site.

[0030] It should be noted that the dual-wire starter brush holder described in this utility model is used in, but not limited to, starters. For ease of explanation, this utility model only uses the application of the dual-wire starter brush holder in starters as an example. The principle of the dual-wire starter brush holder in other types of equipment is essentially the same as that in starters, and will not be described in detail here.

[0031] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of a dual-wire starter brush holder in one embodiment of the present invention. The dual-wire starter brush holder includes a rear cover 1, a brush holder base plate 2, a negative carbon brush wire 3, a main negative terminal connector 4, and an insulation component 5. The brush holder base plate 2 is insulatedly mounted on the rear cover 1. The rear cover 1 has a concave cavity, and the brush holder base plate 2 is inserted into the inner side of the rear cover 1. The negative carbon brush wire 3 is located on the side of the brush holder base plate 2 away from the rear cover 1 and is electrically connected to the brush holder base plate 2. The negative carbon brush wire 3 is a wire connected to the negative carbon brush and can be made of copper braid. The outer layer of the copper braid is provided with an insulating sleeve. One end of the copper braid is connected to the negative carbon brush, and the other end is welded to the brush holder base plate 2. The brush holder base plate 2 is made of a conductive metal and has... It has an electrical conduction function; the main negative electrode connector 4 is set on the brush holder base plate 2 and fixedly connected to the brush holder base plate 2 to form an electrical conduction, thereby achieving the purpose of electrical conduction between the brush holder base plate 2 and the negative electrode carbon brush wire 3. At this time, the negative electrode carbon brush wire 3 only needs to be directly welded to the brush holder base plate 2 near the negative electrode carbon brush, which greatly shortens the length of the negative electrode carbon brush wire 3, that is, shortens the length of the copper braid. With the shortened length and welding fixation, the position of the copper braid is stable, avoiding the problem of the back cover 1 being pinched during installation due to excessive length; the insulation component 5 is set between the brush holder base plate 2 and the back cover 1, so that the main negative electrode connector 4 and the brush holder base plate 2 are both insulated from the back cover 1.

[0032] In this embodiment, please refer to Figures 1-5The brush holder base plate 2 is fixed on the back cover 1. The main negative terminal connector 4 is welded to the brush holder base plate 2. Then, the negative carbon brush wire 3, i.e. the carbon brush copper braid, on the negative carbon brush is welded to the brush holder base plate 2. The main negative terminal connector 4 is connected to the carbon brush copper braid through the brush holder base plate 2. An insulating component 5 is set between the brush holder base plate 2 and the back cover 1 to insulate the main negative terminal connector 4 from the back cover 1, thus meeting the requirement of a two-wire system with no grounding of the negative terminal.

[0033] Understandably, the brush holder base plate 2 is provided with at least two sets of brush boxes 3c. The two sets of brush boxes 3c are used to insert the positive carbon brush and the negative carbon brush 3a respectively. Furthermore, an insulating plate is provided between the bottom of the positive carbon brush box 3c and the brush holder base plate 2 for insulation separation. Each brush box 3c is also provided with a spring 3b corresponding to a carbon brush to provide a thrust that pushes the carbon brush to fit tightly against the commutator surface.

[0034] In one embodiment, please refer to Figure 2 , Figure 3 and Figure 4 In order to facilitate assembly and to prevent the brush holder base plate 2 from shifting within the back cover 1 and causing contact with the back cover 1, a positioning element 6 is provided between the back cover 1 and the brush holder base plate 2. This restricts the sliding of the brush holder base plate 2 relative to the inner bottom wall of the back cover 1, thus forming a positioning guide for assembly and preventing the brush holder base plate 2 from shifting within the back cover 1.

[0035] Specifically, in order to quickly and centrally position the brush holder base plate 2 inside the rear cover 1, the positioning component 6 includes several insulating protrusions 61 fixed on the brush holder base plate 2. The rear cover 1 is provided with limiting grooves 62 corresponding to the insulating protrusions 61. By inserting the insulating protrusions 61 into the limiting grooves 62, the brush holder base plate 2 can be centrally positioned inside the rear cover 1. Furthermore, by inserting the insulating protrusions 61 into the limiting grooves 62, the relative sliding of the mounting surface of the brush holder base plate 2 and the rear cover 1 can be restricted, thus stabilizing its installation position inside the rear cover 1.

[0036] In one embodiment, please refer to Figure 2 , Figure 3 and Figure 4 In order to insulate and isolate the main negative terminal 4 and the brush holder base plate 2 from the rear cover 1, the insulation component 5 includes an insulating pad 51 and an insulating sleeve 52. The insulating pad 51 is inserted between the brush holder base plate 2 and the inner wall of the rear cover 1 to insulate and isolate the brush holder base plate 2 from the rear cover 1. The insulating sleeve 52 is sleeved on the outside of the main negative terminal 4 to insulate and isolate the outside of the main negative terminal 4 from the rear cover 1.

[0037] Understandably, both the insulating pad 51 and the insulating kit 52 are made of insulating materials. There is no specific limitation on the insulating materials used here, as long as the insulating effect is achieved.

[0038] In one embodiment, please refer to Figure 2 , Figure 3 and Figure 4 In order to provide effective insulation when the main negative terminal 4 passes through the back cover 1, the back cover 1 is provided with a first through hole 101 for the main negative terminal 4 to pass through. The insulating kit 52 is inserted into the inside of the first through hole 101 and has a stepped surface 52a that abuts against the side of the back cover 1 away from the brush holder base plate 2. That is, the insulating kit 52 passes through the first through hole 101 and abuts against the insulating pad 51, and the insertion depth is limited by the stepped surface 52a.

[0039] In one embodiment, please refer to Figure 2 , Figure 3 and Figure 4 In order to fix the brush holder base plate 2 to the rear cover 1, a locking member 7 is provided between the brush holder base plate 2 and the rear cover 1, so that the brush holder base plate 2 is locked to the rear cover 1.

[0040] Specifically, in order to simplify the structure while locking the brush holder base plate 2 to the rear cover 1, the locking component 7 includes a nut 71. The nut 71 is threaded onto the main negative terminal connector 4 and abuts against the insulating kit 52, causing the stepped surfaces 52a of the brush holder base plate 2 and the insulating kit 52 to press against the inner and outer sides of the rear cover 1 respectively, thus locking the brush holder base plate 2 in place. By installing the nut 71 on the main negative terminal connector 4, the nut 71 pushes against the stepped surfaces 52a of the insulating kit 52 to press against the outer side of the rear cover 1, thereby pulling the brush holder base plate 2 to press the insulating pad 51 inside the rear cover 1, thus forming a fixed installation.

[0041] Furthermore, in order to meet the requirements of reliability, heat dissipation, mechanical stability and redundancy under high current load, a second through hole 102 is provided on the rear cover 1, and a secondary negative terminal connector 8 is provided on the brush holder base plate 2. The secondary negative terminal connector 8 is inserted into the inner side of the second through hole 102 and is insulated from the rear cover 1 by the insulating component 5. By connecting the two negative terminals in parallel, the high current can be distributed to two contact points, reducing the current density of a single bolt, reducing heat generation and contact loss, and ensuring the stability of the current path.

[0042] Understandably, starter motors operate on the vehicle chassis and are subjected to vibration and impact over long periods. A single negative terminal connection could loosen, leading to poor contact. Furthermore, having two negative terminals in different locations creates a more robust mechanical connection, reducing the risk of contact surface loosening or detachment due to vibration and ensuring connection reliability. If one negative terminal bolt or its connecting wire fails, the other bolt can still maintain circuit continuity, preventing the starter motor from failing to start due to a single fault. Parallel connection of the two negative terminals reduces the current density at the contact point, thereby reducing Joule heating and preventing bolt or brush holder overheating and failure. The dual negative terminal design reduces overall contact resistance and improves circuit efficiency through more uniform current distribution.

[0043] Furthermore, in order to ensure that the installation orientation is unique, the main negative terminal connector 4 and the secondary negative terminal connector 8 have different diameters, thereby forming a unique insertion position and avoiding inverted installation.

[0044] Furthermore, both the main negative terminal connector 4 and the secondary negative terminal connector 8 are negative terminal bolts.

[0045] Understandably, depending on different needs, the negative terminal connector may also use other conductive connector components besides the negative terminal bolt.

[0046] To better understand this utility model, the following is combined with... Figures 1 to 5 The technical solution of this utility model is described in detail as follows: The brush holder base plate 2 is installed inside the rear cover 1 and is insulated from the rear cover 1 by an insulating pad 51. A main negative terminal connector 4 and a secondary negative terminal connector 8 are welded on the brush holder base plate 2. Two negative terminal bolts pass through the rear cover 1 through the first through hole 101 and the second through hole 102, respectively. An insulating kit 52 is provided at each through hole for insulation isolation. The two negative terminal bolts are then connected to the two negative terminal bolts by a nut 71, which is tightened against the insulating kit 52 on the rear cover 1, thereby locking the brush holder base plate 2 on the rear cover 1.

[0047] The following steps can be used to assemble the brush holder of a dual-wire starter motor:

[0048] First, weld both the main negative terminal connector 4 and the secondary negative terminal connector 8 onto the brush holder base plate 2, that is, weld both negative terminal bolts onto the brush holder base plate 2.

[0049] The second step is to place the insulating board between the positive electrode brush box and the brush holder base plate 2, and rivet it tightly.

[0050] The third step is to weld the two negative carbon brush wires 3 to the brush holder base plate, that is, to weld the two negative carbon brush copper braids to the brush holder base plate.

[0051] The fourth step is to install the negative electrode carbon brush into the negative electrode brush box;

[0052] Fifth step, weld the negative electrode bolt to the brush holder base plate 2;

[0053] Step 6: Install the four springs 3b onto the mounting brackets next to the positive and negative brush boxes;

[0054] Step 7: Place the annular insulating pad 51 between the brush holder base plate 2 and the back cover 1, and ensure that the negative electrode bolt passes through the reserved hole of the back cover 1 before tightening the back cover, i.e., through the first through hole 101 or the second through hole 102.

[0055] Step 8: Pass the insulating kit 52 through the negative electrode bolt and into the pre-drilled hole in the back cover, then secure the insulating bushing with the nut 71.

[0056] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A dual-wire starter brush holder, characterized in that, include: Back cover; The brush holder base plate is insulated and mounted on the rear cover; A negative electrode carbon brush lead is disposed on the side of the brush holder base plate opposite to the rear cover and is electrically connected to the brush holder base plate; and The main negative terminal is disposed on the brush holder base plate and is electrically connected to the negative carbon brush wire through the brush holder base plate.

2. The dual-wire starter brush holder according to claim 1, characterized in that, It also includes an insulation component disposed between the brush holder base plate and the rear cover, so that the main negative terminal and the brush holder base plate are both insulated from the rear cover.

3. The dual-wire starter brush holder according to claim 2, characterized in that, The insulating assembly includes an insulating pad and an insulating sleeve. The insulating pad is inserted between the brush holder base plate and the inner wall of the rear cover, and the insulating sleeve is fitted onto the outside of the main negative terminal.

4. The dual-wire starter brush holder according to claim 1, characterized in that, A positioning element is provided between the back cover and the brush holder base plate to restrict the sliding of the brush holder base plate relative to the inner bottom wall of the back cover.

5. The dual-wire starter brush holder according to claim 4, characterized in that, The positioning component includes several insulating protrusions fixed on the brush holder base plate, and the rear cover is provided with limiting grooves corresponding to the insulating protrusions one by one.

6. The dual-wire starter brush holder according to claim 3, characterized in that, The rear cover has a first through hole for the main negative terminal connector to pass through. The insulating kit is inserted into the inner side of the first through hole and has a stepped surface that abuts against the side of the rear cover away from the brush holder base plate.

7. The dual-wire starter brush holder according to claim 3, characterized in that, A locking element is also provided between the brush holder base plate and the rear cover to lock the brush holder base plate onto the rear cover.

8. The dual-wire starter brush holder according to claim 7, characterized in that, The locking component includes a nut, which is threaded onto the main negative terminal connector and abuts against the insulating kit, thereby pressing the brush holder base plate and the stepped surface of the insulating kit against the inner and outer sides of the rear cover, thus locking the brush holder base plate in place.

9. The dual-wire starter brush holder according to claim 2, characterized in that, The rear cover has a second through hole, and the brush holder base plate has a secondary negative terminal connector. The secondary negative terminal connector is inserted into the inner side of the second through hole and is insulated from the rear cover by the insulating component.

10. The dual-wire starter brush holder according to claim 9, characterized in that, Both the main negative terminal and the secondary negative terminal are negative terminal bolts.

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