Multi-contact elastic rolling and sliding electric brush structure

Abstract

The utility model relates to a multi-contact elastic rolling and sliding electric brush structure, which belongs to the field of electrical laminated contact devices and comprises a sliding ring, a fixing sleeve and a plurality of rolling and sliding mechanisms, the fixing sleeve and the sliding ring are concentrically arranged outside the sliding ring at intervals, the rolling and sliding mechanisms are used for conducting electricity in the sliding process, and the rolling and sliding mechanisms are circumferentially and uniformly distributed on the outer side of the sliding ring. One end, far away from the sliding ring, of the rolling and sliding mechanism is pivoted with the fixing sleeve; wherein the rolling and sliding mechanism comprises a support arm and a pulley electric brush, one end, far away from the sliding ring, of the support arm is pivoted with the fixing sleeve, a torsion spring is assembled in a pivot of the support arm at the pivoted position, the torsion spring drives the support arm to be close to the sliding ring, and the peripheral surface of the pulley electric brush abuts against the sliding ring. The number of the rolling and sliding mechanisms is increased, a plurality of ventilation openings are formed in the surrounding fixing sleeve, the problem that a combination point is prone to overheating is solved, the provided pressure spring and the torsion spring act cooperatively, and the free allowance of the whole mechanism is large.

Description

Technical Field

[0001] This utility model belongs to the field of electrical laminated contact device, and specifically relates to a multi-contact elastic rolling brush structure. Background Technology

[0002] A brush (also known as a carbon brush) is a key component that transmits electrical energy through sliding contact. It is widely used in motors, generators, power tools, and other equipment. Microcrystalline graphite, treated at high temperatures, possesses self-lubricating and wear-resistant properties, making it widely used in high-precision commutation equipment. The brush provides constant pressure to ensure close contact between the brush and rotating components (commutator or slip ring). However, existing brush designs have the following shortcomings:

[0003] 1. During use, fixed brushes are mostly used with a set of fixed brackets and a "V" shaped spring or a semi-circular contact bending design to enhance the adaptability of the contact and the contact surface. This "V" shaped spring will abut the brush against the contact surface during use. However, this "V" shaped spring is relatively rigid and cannot effectively filter the vibration of the slip ring during use, which can easily cause interference and damage to the contact surface.

[0004] 2. In current brush designs, the number of brushes is relatively small. If an individual brush experiences high resistance due to overheating or breaks the circuit due to vibration, high voltage will flow to other brushes. If the environment is high-temperature or there is a problem with heat dissipation, the brush section will become vulnerable, causing the entire device to stop. Therefore, conventional brush designs have potential safety hazards.

[0005] 3. Existing brush structures often neglect the heat dissipation problem at the brush contact points. With high-speed operation, the high heat at the contact points will lead to an increase in local resistance. This problem has not been taken into account in the design of existing technologies.

[0006] Chinese patent CN 221447662 U discloses a multi-layered hook-shaped brush structure for conductive slip rings, including a conductive fixing block and hook-shaped brushes spaced apart from top to bottom on the conductive fixing block, with the ends of all hook-shaped brushes at the same height. This invention achieves multi-point contact in the slip ring friction pair by setting the brushes in a multi-layered structure and hook-shaped ends, improving the contact reliability and current carrying capacity of the friction pair. It employs the aforementioned "V"-shaped spring sheet structure, which, while simple, is prone to interference problems as described above, potentially leading to damage to the contact surface.

[0007] As can be seen from the above, the existing technology does not have an applicability design for the connection position of the brush and the slip ring, nor does it have a structural optimization for the connection between the two, which poses a safety hazard. Utility Model Content

[0008] In order to solve the problem mentioned in the background art that the existing brush has few contacts and cannot effectively filter vibration and is prone to interference, a multi-contact elastic rolling brush structure is specifically provided.

[0009] To achieve the above objectives, this utility model provides the following technical solution:

[0010] A multi-contact elastic roller brush structure is provided, including a slip ring, characterized in that it further includes...

[0011] A retaining sleeve, concentrically spaced outside the slip ring, is provided between the retaining sleeve and the outer wall of the slip ring to accommodate the brush; and,

[0012] Multiple rolling and sliding mechanisms for conducting electricity during sliding are evenly distributed in a circle on the outside of the slip ring. The end of the rolling and sliding mechanism away from the slip ring is pivotally connected to the fixed sleeve.

[0013] The rolling mechanism includes a support arm and a pulley brush. The end of the support arm away from the slip ring is pivotally connected to the fixed sleeve. A torsion spring is installed inside the pivot of the support arm at the pivot position. The torsion spring drives the support arm to move closer to the slip ring. The pulley brush is pivotally connected to the bottom end of the support arm, and the outer circumferential surface of the pulley brush abuts against the slip ring.

[0014] Furthermore, it also includes a compression spring, one end of which is fixedly connected to the inner wall of the fixed sleeve, and the other end of which is connected to the support arm. The compression spring is inclined and limited between the support arm and the inner wall of the fixed sleeve.

[0015] Furthermore, the pulley brush is roller-shaped, and multiple columnar grooves for cooling are evenly distributed around the wheel surface of the pulley brush, with the columnar grooves extending radially along the pulley brush.

[0016] Furthermore, each of the inner sides of the pulley brush is provided with a columnar groove, and the groove opening is chamfered.

[0017] Furthermore, the support arm comprises two spaced-apart and parallel-extending connecting parts, and the pulley brush is mounted between the connecting parts.

[0018] Furthermore, the fixed sleeve is provided with multiple ventilation openings around the axial direction.

[0019] Furthermore, the slip ring has an upwardly extending protrusion on its edge, and an annular groove is formed between the protrusions for contacting the pulley brush.

[0020] As can be seen from the above description, the beneficial effects of this technical solution are as follows:

[0021] 1. By using the added fixed sleeve and rolling mechanism together, the rolling mechanism can use the fixed sleeve as a base and force the pulley brush to abut against the slip ring. The pulley brush can roll along the slip ring and continuously contact the slip ring. The pulley brush is pulled and pressed against the pulley brush by the compression spring, and the pulley brush posture remains stable throughout the process.

[0022] 2. Multiple rolling and sliding mechanisms have been added, each hinged to a fixed sleeve. As the slip ring rotates, it is pressed against the slip ring by a compression spring. Simultaneously, a torsion spring drives the support arm back to its original position. This mechanism is simple, efficient, easy to manufacture and implement, and can filter out minute vibrations, ensuring the pulley brush remains firmly against the slip ring. It solves the problem of rigid interference caused by the aforementioned "V"-shaped spring jumping in vibrating environments.

[0023] 3. Multiple air vents are provided on the surrounding fixed sleeve, and multiple columnar grooves are provided on the pulley brush. Both the air vents and the columnar grooves can drive the airflow to flow in the annular groove used to accommodate the pulley brush. By using the designed air vents and the rotational ability of the pulley brush to drive the airflow, the problem of the above-mentioned joint point being prone to overheating can be solved.

[0024] 4. The provided compression spring and torsion spring work together. The compression spring can press the brush against the slip ring and adjust the pressure between the two to maintain the preload between the brush and the slip ring. At the same time, the support arm can be hinged to the fixed sleeve. The hinge point between the two will be driven by the torsion spring to rotate the support arm. The overall mechanism has a large free margin and the two parts work together closely and efficiently. Attached Figure Description

[0025] To describe this patent more clearly, one or more drawings are provided below.

[0026] Figure 1 A front view of a multi-contact elastic roller brush structure;

[0027] Figure 2 Axial view of a multi-contact elastic roller brush structure;

[0028] Figure 3 for Figure 2 Enlarged view of point B in the middle;

[0029] Figure 4 for Figure 2 Enlarged view of point C in the middle;

[0030] Figure 5 A top view of a multi-contact elastic roller brush structure;

[0031] 1. Slip ring; 2. Fixing sleeve; 3. Pulley brush; 4. Support arm; 5. Compression spring; 6. Motor shaft; 7. Swing shaft; 8. Vent; 9. Annular groove. Detailed Implementation

[0032] The following is based on the appendix Figure 1-5 The technical solutions in the embodiments of this invention are clearly and completely described in this utility model; the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0033] Example 1

[0034] like Figure 1-2 As shown, a multi-contact elastic rolling brush structure is provided, including a slip ring 1 and a fixing sleeve 2, which is concentrically spaced outside the slip ring 1. An annular space for accommodating the brush is left between the fixing sleeve 2 and the outer wall of the slip ring 1; and a rolling mechanism for conducting electricity during sliding, which is a plurality of evenly distributed circumferentially on the outside of the slip ring 1, with the end of the rolling mechanism away from the slip ring 1 pivotally connected to the fixing sleeve 2.

[0035] The fixed sleeve 2 can be any of a cylindrical, square, or triangular shape. The multi-contact elastic rolling brush structure of this solution is a brush part structure integrated at one end of the motor. Therefore, the motor housing, the motor movement mode, and the current output mode of the brush are based on the motor structure and the connection mode of the brush and external wires disclosed in the prior art. The brush outputs current through contact with the slip ring 1 and sends it out through the external wires, and vice versa.

[0036] The rolling mechanism is a pulley brush 3, which is pivotally connected to the inside of the fixed sleeve 2 via a swing bracket. The fixed sleeve 2 can be the motor housing itself or an adaptable cylindrical body installed inside the motor housing. The slip ring 1 will rotate synchronously with the motor shaft, ensuring that the pulley brush 3 and the slip ring 1 are always in contact during the rotation of the slip ring 1.

[0037] The number of the rolling and sliding mechanisms is multiple. By having multiple rolling and sliding mechanisms in constant contact with the slip ring 1, it is possible to effectively filter out minor vibrations during vibration, prevent rigid interference, and extend the equipment life.

[0038] Example 2

[0039] like Figure 1-4As shown, a multi-contact elastic rolling brush structure is provided, including a slip ring 11 and a fixing sleeve 2, which is concentrically and spaced outside the slip ring 1. An annular space for accommodating the brush is left between the fixing sleeve 2 and the outer wall of the slip ring 1; and a rolling mechanism for conducting electricity during sliding, which is a plurality of evenly distributed circumferentially on the outside of the slip ring 1, with the end of the rolling mechanism away from the slip ring 1 pivotally connected to the fixing sleeve 2.

[0040] See appendix Figure 2 The specific structure of the rolling mechanism is as follows: it includes a support arm 4 and a pulley brush 3. The end of the support arm 4 away from the slip ring 1 is pivotally connected to the fixed sleeve 2. A torsion spring is installed in the pivot of the support arm 4 at the pivot position. The support arm 4 is pivotally connected to the fixed sleeve 2 through a swing shaft 7. The swing shaft 7 itself can also serve as a wire for sending current outward. The two ends of the swing shaft can be connected to extended wires. The wires extend in the fixed sleeve 2 and pass out radially.

[0041] One end of the torsion spring acts on the fixed sleeve 2, and the other end acts on the support arm 4, thus swinging the free end of the support arm 4 to a position close to the slip ring 1. The torsion spring drives the support arm 4 to move closer to the slip ring 1, and the pulley brush 3 is pivotally connected to the bottom end of the support arm 4, with the outer circumferential surface of the pulley brush 3 abutting against the slip ring 1.

[0042] To meet the self-adjusting pressure between the brush and the slip ring 1, a compression spring 5 is also provided. One end of the compression spring 5 is fixedly connected to the inner wall of the fixed sleeve 2, and the other end of the compression spring 5 is connected to the support arm 4. The compression spring 5 is inclined and limited between the support arm 4 and the inner wall of the fixed sleeve 2. A triangular support structure is formed between the support arm 4, the inner wall of the fixed sleeve 2 and the compression spring 5.

[0043] The fixed sleeve 2 can be any of a cylindrical, square, or triangular shape. The multi-contact elastic rolling brush structure of this solution is a brush part structure integrated at one end of the motor. Therefore, the motor housing, the motor movement mode, and the current output mode of the brush are based on the motor structure and the connection mode of the brush and external wires disclosed in the prior art. The brush outputs current through contact with the slip ring 1 and sends it out through the external wires, and vice versa.

[0044] The fixing sleeve 2 is an insulating cylindrical body fixed inside the motor housing. The support arm 4 is a metal part. The pulley brush 3 is made of a composite material of alloy base and graphite. The fixing sleeve 2 is fixed inside the motor housing by an insulating support or is tightened inside the motor housing with the same internal size as the motor housing. The support arm 4 is connected to the wire that supplies power to the outside. Of course, there will be insulation treatment between the wire and the motor housing, such as by covering the wire with enameled wire.

[0045] Through the swing of the support arm 4, especially the combined action of the torsion spring and the compression spring 5, the support arm 4 will drive the pulley brush 3 to make close contact with the slip ring 1, ensuring that the contact stress is ≤120MPa.

[0046] Example 3

[0047] This application requests disclosure of a multi-contact elastic rolling brush structure, referring to... Figure 1 and Figure 5 It includes the content of Example 2, but differs from Example 2 in that:

[0048] Reference Appendix Figure 5 To address the heat dissipation performance at the contact surface between the brush and the slip ring 1, the pulley brush 3 is roller-shaped, with multiple columnar grooves for cooling evenly distributed around the wheel surface of the pulley brush 3. The columnar grooves extend radially along the pulley brush 3, and are arranged in two rows on the inner side of the edge of the pulley brush 3. The opening of the columnar grooves is chamfered to form a funnel shape.

[0049] To increase ventilation, the support arm 4 consists of two spaced-apart and parallel connecting parts. The pulley brush 3 is pivotally mounted between the connecting parts to allow the pulley brush 3 to rotate freely. The rolling mechanism is entirely made of metal parts to enable the outward transmission of current.

[0050] The fixed sleeve 2 has multiple ventilation holes 8 circumferentially opened around it, and the edge of the slip ring 1 has a protrusion extending upward. The protrusions form an annular groove 9 for contacting the pulley brush 3, and the brush fits in the annular groove 9.

[0051] The principle of this utility model is as follows:

[0052] During the rotation of the motor shaft 6, the slip ring 1 will rotate synchronously. The slip ring 1 itself is a ring-shaped body fixed to the motor shaft 6 by the base and moves synchronously with the motor shaft 6. During the rotation, the pulley brush 3 will be rotated by the torsion spring to the support arm close to the slip ring and pressed against the upper slip ring 1. During this process, any slight vibration will be absorbed by the compression spring and rebound to filter vibration and prevent rigid interference. The pulley brush 3 replaces the conventional columnar brush. The structure of the pulley brush 3 replaces the conventional columnar brush. The friction coefficient of the pulley brush 3 is smaller, so multi-contact contact can be achieved to reduce overall friction and improve overall life.

Claims

1. A multi-contact flexible sliding brush structure comprising a slip ring (1), characterized in that, Also includes A fixing sleeve (2) is concentrically spaced outside the slip ring (1), and an annular space for accommodating the brush is left between the fixing sleeve (2) and the outer wall of the slip ring (1); and, Multiple rolling and sliding mechanisms (A) for conducting electricity during sliding are evenly distributed in a circle on the outside of the slip ring (1). The end of the rolling and sliding mechanism (A) away from the slip ring (1) is pivotally connected to the fixed sleeve. The rolling mechanism (A) includes a support arm (4) and a pulley brush (3). The end of the support arm (4) away from the slip ring (1) is pivotally connected to the fixed sleeve. A torsion spring is installed in the pivot of the support arm (4) at the pivot position. The torsion spring drives the support arm (4) to move closer to the slip ring (1). The pulley brush is pivotally connected to the bottom end of the support arm (4). The outer circumferential surface of the pulley brush (3) abuts against the slip ring (1).

2. A multi-contact flexible sliding brush structure according to claim 1, characterized in that, It also includes a compression spring (5), one end of which is fixedly connected to the inner wall of the fixed sleeve, and the other end of which is connected to the support arm (4). The compression spring (5) is inclined and limited between the support arm (4) and the inner wall of the fixed sleeve.

3. A multi-contact flexible sliding brush structure according to claim 1, characterized in that, The pulley brush (3) is roller-shaped, and columnar grooves for cooling are evenly distributed around the wheel surface of the pulley brush (3). The columnar grooves extend radially along the pulley brush.

4. A multi-contact flexible sliding brush structure according to claim 1, characterized in that, The arm (4) comprises two spaced-apart and parallel connecting parts, and the pulley brush is mounted between the connecting parts.

5. A multi-contact flexible sliding brush structure according to claim 1, characterized in that, The fixed sleeve has multiple through-holes (8) circumferentially axially opened.

6. A multi-contact flexible sliding brush structure according to claim 1, characterized in that, The slip ring (1) has a protrusion extending upward from its edge, and the protrusion and the wheel surface of the slip ring (1) together form an annular groove (9) for contacting the pulley brush.

Images