Electromagnetic brake structure and electric wheelchair

Abstract

The present application relates to the technical field of brake equipment, and in particular to an electromagnetic brake structure, which includes: a base body, a push rod and an electromagnetic drive module, wherein the base body is provided with a mounting through hole, the push rod can be slidably inserted into the mounting through hole, the bottom of the push rod is connected to a pressure plate, and the pressure plate is located at the bottom of the base body; the upper part of the push rod is provided with a mounting groove matching the eccentric cam; the mounting groove is provided with a self-locking position for the eccentric cam to self-lock; the eccentric cam is connected to a matching cam rod; the electromagnetic drive module is connected to the cam rod, and the electromagnetic drive module can drive the cam rod to rotate to a first position so that the pressure plate abuts against the brake pad to achieve braking; the electromagnetic drive module can also drive the cam rod to rotate to a second position so that the pressure plate is separated from the brake pad and the brake is released. The present application utilizes the self-locking of the eccentric cam to effectively maintain the abutment and fit between the pressure plate and the brake pad, without requiring the electromagnetic drive module to be powered all the time to drive the brake, thereby reducing the power consumption of the electromagnetic brake.

Description

Technical Field

[0001] The present application relates to the technical field of brake equipment, and in particular to an electromagnetic brake structure. Background Art

[0002] Electric wheelchairs, also known as electric wheelchairs, are a means of transportation for special groups such as the disabled, the elderly and frail, and those undergoing medical rehabilitation. Wheelchairs often require braking during use, and the wheelchair motor is typically braked using brake pads or electromagnetic brakes. Existing electromagnetic brakes typically brake the wheelchair motor by driving a pressure plate driven by the iron core of the electromagnetic drive module against the brake pads. While this can brake the wheelchair motor, the electromagnetic drive module must remain powered and the pressure plate must be in constant contact with the brake pads to ensure effective braking. This results in high power consumption for the electromagnetic brake, which in turn reduces the range of the electric wheelchair. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides an electromagnetic brake structure to avoid the problem that the existing electromagnetic brake structure in the background art needs to be electrically braked all the time and consumes a lot of power.

[0004] The technical solutions provided by the present invention are as follows:

[0005] An electromagnetic brake structure, comprising:

[0006] A base body, wherein the base body is provided with a mounting through hole,

[0007] A push rod is slidably inserted into the mounting through hole, a pressure plate is connected to the bottom of the push rod, and the pressure plate is located at the bottom of the seat body; a mounting groove matching the eccentric cam is provided on the upper part of the push rod; a self-locking position for self-locking the eccentric cam is provided in the mounting groove; the eccentric cam is connected to a matching cam rod;

[0008] An electromagnetic drive module is connected to the cam rod. The electromagnetic drive module can drive the cam rod to rotate to a first position so that the pressure plate abuts against the brake pad to achieve braking; the electromagnetic drive module can also drive the cam rod to rotate to a second position so that the pressure plate is separated from the brake pad to release the brake.

[0009] Furthermore, the electromagnetic drive module includes a first electromagnet and a second electromagnet; the first electromagnet and the second electromagnet are respectively connected to the cam rod, and the first electromagnet drives the cam rod to drive the eccentric cam to rotate clockwise, driving the pressure plate to abut against the brake pad, and the eccentric cam is in a self-locking position and self-locks; the second electromagnet drives the cam rod to drive the eccentric cam to rotate counterclockwise, driving the pressure plate to separate from the brake pad.

[0010] Furthermore, the present application includes a connecting frame, the first electromagnet and the second electromagnet are respectively arranged on both sides of the connecting frame, and the iron cores of the first electromagnet and the second ferromagnet are respectively connected to the side walls of the connecting frame; a clamping plate is provided on the connecting frame between the first electromagnet and the second electromagnet, and the cam rod is connected to the clamping plate.

[0011] Furthermore, a first spring is provided on the iron core of the first electromagnet and / or the second electromagnet, and the first spring is arranged close to the side wall of the connecting frame.

[0012] Furthermore, a second spring is sleeved on the push rod close to the end of the pressure plate.

[0013] Furthermore, the present application includes a manual switch mechanism, which includes a handle, which is rotatably mounted on the base body, one end of the handle is a hand-holding part, and the other end of the handle is an abutment part. When the handle is rotated, the abutment part can drive the cam rod to rotate to the second position.

[0014] Furthermore, the manual switch mechanism further includes a travel switch, which is provided on the rotation path of the abutting portion, and the travel switch is used to obtain the rotation state of the handle.

[0015] Furthermore, the electromagnetic brake structure is installed on the rear end cover of the brake motor, and the rear end cover is detachably connected to the brake motor; the motor shaft sleeve located at the rear end cover is provided with a brake pad that can rotate with the motor shaft, and the electromagnetic drive module drives the pressure plate at the bottom of the push rod to abut against the brake pad to achieve braking; the brake pad is separated from the pressure plate to release the brake.

[0016] Furthermore, the present application also includes a power storage element, which is connected to the electromagnetic drive module and is used to supply power to the electromagnetic drive module when the power is cut off.

[0017] The present application also provides an electric wheelchair, comprising the above-mentioned electromagnetic brake structure.

[0018] Beneficial effects:

[0019] The electromagnetic brake structure of the present application is provided with an installation groove matching the eccentric cam on the upper part of the push rod, and the installation groove is installed with the eccentric cam, and the eccentric cam is connected to a matching cam rod; the electromagnetic drive module includes a first electromagnet and a second electromagnet; the first electromagnet and the second electromagnet are respectively connected to the cam rod, the first electromagnet drives the cam rod to drive the eccentric cam to rotate clockwise, so that the pressure plate abuts against the brake pad of the motor shaft to achieve braking, and the second electromagnet drives the cam rod to drive the eccentric cam to rotate counterclockwise, so that the pressure plate is separated from the brake pad of the motor shaft and the brake is released; compared with the prior art, the electromagnetic brake structure of the present application utilizes the self-locking of the eccentric cam, which can effectively maintain the abutment and fit between the pressure plate and the brake pad, greatly saving the power consumption of the electromagnetic brake. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 It is a structural schematic diagram of an electromagnetic brake structure of the present invention when assembled on a motor.

[0022] Figure 2 yes Figure 1 Schematic diagram of the electromagnetic brake structure;

[0023] Figure 3 yes Figure 2 Schematic diagram of the cross-section structure (excluding the electromagnetic drive module);

[0024] Figure 4 yes Figure 2 Schematic diagram of the structure of the middle connecting frame.

[0025] Components include: 1. Base, 2. Push rod, 3. Pressure plate, 4. Eccentric cam, 5. Cam rod, 6. Electromagnetic drive module, 6.1. First electromagnet, 6.2. Second electromagnet, 6.3. Iron core, 7. Connecting frame, 7.1. Clamping plate, 8. Handle, 8.1. Handhold, 8.2. Abutment, 9. First spring, 10. Spring, 11. Brake pad, 12. Motor, 12.1. Rear end cap. DETAILED DESCRIPTION

[0026] In order to help those skilled in the art better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of this application.

[0027] It should be noted that when an element is referred to as being “fixed on” or “set on” another element, it can be directly on the other element or indirectly set on the other element; when an element is referred to as being “connected to” another element, it can be directly connected to the other element or indirectly connected to the other element.

[0028] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0030] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the efficacy and purpose that can be achieved by this application.

[0031] like Figures 1 to 2 As shown, an electromagnetic brake structure includes: a base body 1, which is provided with a mounting through hole, a push rod 2, which is slidably inserted in the mounting through hole, and a pressure plate 3 is connected to the bottom of the push rod, and the pressure plate is located at the bottom of the base body; the upper part of the push rod is provided with a mounting groove matching the eccentric cam; the mounting groove is provided with a self-locking position for self-locking the eccentric cam; the eccentric cam 4 is provided in the mounting groove, and the eccentric cam is connected to a matching cam rod 5; an electromagnetic drive module 6, which is connected to the cam rod, and the electromagnetic drive module can drive the cam rod to rotate to a first position, so that the pressure plate abuts against the brake pad to achieve braking; the electromagnetic drive module can also drive the cam rod to rotate to a second position, so that the pressure plate is separated from the brake pad to release the brake.

[0032] In the above scheme, the electromagnetic brake structure of the present application utilizes the self-locking of the eccentric cam to effectively maintain the abutment and fit between the pressure plate and the brake pad, without the need for the electromagnetic drive module to always be powered to drive the brake, effectively reducing the power consumption of the electromagnetic brake.

[0033] As a preferred embodiment, the electromagnetic drive module 6 includes a first electromagnet 6.1 and a second electromagnet 6.2; the first electromagnet and the second electromagnet are respectively connected to the cam rod, and the first electromagnet drives the cam rod to drive the eccentric cam to rotate clockwise, driving the pressure plate to abut against the brake pad for braking, and the eccentric cam is in the self-locking position of the mounting groove and self-locks; the second electromagnet drives the cam rod to drive the eccentric cam to rotate counterclockwise, driving the pressure plate to separate from the brake pad.

[0034] More preferably, the present application includes a connecting frame 7, the first electromagnet and the second electromagnet are respectively arranged on both sides of the connecting frame, and the iron cores 6.3 of the first electromagnet and the second ferromagnet are respectively connected to the side walls of the connecting frame; a card plate 7.1 is provided on the connecting frame between the first electromagnet and the second electromagnet, and the cam rod is connected to the card plate; a card slot or a card hole is provided on the card plate, and the free end of the cam rod is clamped in the card slot or the card hole, see Figure 4 .

[0035] The connecting frame of the present application converts the required rotation of the cam rod into the translation or swinging of the connecting frame; in addition, the connecting frame integrates the first electromagnet and the second electromagnet into a whole, which has a compact structure and can also enable the first electromagnet and the second electromagnet to be driven when one of the electromagnets is in motion.

[0036] As a preferred embodiment, a first spring 9 is provided on the iron core of the first electromagnet and / or the second electromagnet, and the first spring is arranged close to the side wall of the connecting frame; while the first spring has a buffering effect, it can also apply a certain elastic force to the connecting frame to reduce the driving force required to be applied by the electromagnetic drive module.

[0037] As a preferred embodiment, a second spring 10 is sleeved on the push rod near the end of the pressure plate. Figure 3 The upper and lower portions of the mounting hole have different diameters, with the diameter of the upper portion being smaller than that of the lower portion. A second spring is provided on the push rod sleeve located at the lower portion of the mounting hole. The second spring can apply a downward elastic force to the push rod, facilitating braking of the brake structure, or an upward force to release the brake. This second spring configuration can, on the one hand, apply a corresponding preload force, and on the other hand, balance other internal and external forces. It should be noted that the elastic force applied by the first spring is much smaller than that applied by the second spring.

[0038] As a preferred embodiment, the present application includes a manual switch mechanism, which includes a handle 8, which is rotatably mounted on the base. One end of the handle 8 is a hand-held portion 8.1, and the other end of the handle is an abutment portion 8.2. When the handle is rotated, the abutment portion can drive the cam rod to rotate to the second position. Figure 1 and Figure 2In this embodiment, the abutment portion abuts the outer wall of the connecting frame. Turning the handle drives the connecting frame to move horizontally, which in turn drives the push rod upward through the cooperation of the cam lever and the cam, releasing the brake. The provision of a manual switch allows the brake to be released in the event of a power outage or fault. This is particularly true for electric wheelchairs, where manual release of the brake can still propel the wheelchair after a power outage.

[0039] More preferably, the manual switch mechanism further includes a travel switch disposed along the rotational path of the abutment portion, the travel switch being used to detect the rotational state of the handle. In this embodiment, the travel switch is disposed at a release point along the rotational path of the abutment portion. When the abutment portion contacts the travel switch, the pressure plate separates from the brake pad, releasing the brake.

[0040] As a preferred embodiment, the electromagnetic brake structure is installed on the rear end cover 12.1 of the brake motor, and the rear end cover is detachably connected to the brake motor; the motor shaft sleeve located at the rear end cover is provided with a brake pad that can rotate with the motor shaft, and the electromagnetic drive module drives the pressure plate at the bottom of the push rod to abut against the brake pad to achieve braking; the brake pad is separated from the pressure plate to release the brake; the electromagnetic brake structure of the present application can be directly installed on the rear end cover of the motor, and the motor's rotating shaft can be braked without changing the structure of the motor 12. It can make use of the market application basis of the existing motor and has good development prospects.

[0041] The present application also includes a power storage element, which is connected to the electromagnetic drive module and is used to supply power to the electromagnetic drive module when the power is cut off.

[0042] The present application also provides an electric wheelchair, comprising the above-mentioned electromagnetic brake structure.

[0043] The beneficial effects of the electric wheelchair of the present application correspond to the electromagnetic brake structure of the present application and will not be repeated here.

[0044] It should be noted that the areas not fully described in the above technical solutions are prior art.

[0045] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An electromagnetic brake structure, characterized in that: include: A seat body, wherein the seat body is provided with a mounting through hole, A push rod is slidably inserted into the mounting through hole, a pressure plate is connected to the bottom of the push rod, and the pressure plate is located at the bottom of the seat body; a mounting groove matching the eccentric cam is provided on the upper part of the push rod; a self-locking position for self-locking the eccentric cam is provided in the mounting groove; the eccentric cam is connected to a matching cam rod; An electromagnetic drive module connected to the cam lever can drive the cam lever to rotate to a first position so that the pressure plate abuts against the brake pad to achieve braking; the electromagnetic drive module can also drive the cam lever to rotate to a second position so that the pressure plate separates from the brake pad to release the brake; The electromagnetic drive module includes a first electromagnet and a second electromagnet; the first electromagnet and the second electromagnet are respectively arranged on both sides of the connecting frame, and the iron cores of the first electromagnet and the second ferromagnet are respectively connected to the side walls of the connecting frame; a clamping plate is provided on the connecting frame between the first electromagnet and the second electromagnet, and the clamping plate has a clamping slot or a clamping hole; the cam rod is connected to the clamping slot or the clamping hole; The first electromagnet drives the cam rod to drive the eccentric cam to rotate clockwise, and when the pressure plate is driven to abut against the brake pad, the eccentric cam is in the self-locking position and self-locks; the second electromagnet drives the cam rod to drive the eccentric cam to rotate counterclockwise, and drives the pressure plate to separate from the brake pad.

2. The electromagnetic brake structure according to claim 1, characterized in that: A first spring is provided on the iron core of the first electromagnet and / or the second electromagnet, and the first spring is arranged close to the side wall of the connecting frame.

3. The electromagnetic brake structure according to any one of claims 1 to 2, characterized in that: A second spring is sleeved on the push rod close to the end of the pressure plate.

4. The electromagnetic brake structure according to claim 3, characterized in that: It includes a manual switch mechanism, which includes a handle. The handle is rotatably installed on the base body. One end of the handle is a hand-holding part, and the other end of the handle is an abutment part. When the handle is rotated, the abutment part can drive the cam rod to rotate to the second position.

5. The electromagnetic brake structure according to claim 4, characterized in that: The manual switch mechanism further includes a travel switch, which is arranged on the rotation path of the abutment portion and is used to obtain the rotation state of the handle.

6. The electromagnetic brake structure according to claim 5, characterized in that: The electromagnetic brake structure is installed on the rear end cover of the brake motor, and the rear end cover is detachably connected to the brake motor; the motor shaft sleeve located at the rear end cover is provided with a brake pad that can rotate with the motor shaft, and the pressure plate at the bottom of the push rod abuts against the brake pad to achieve braking; the brake pad is separated from the pressure plate to release the brake.

7. The electromagnetic brake structure according to claim 5, characterized in that: It also includes a power storage element, which is connected to the electromagnetic drive module and is used to supply power to the electromagnetic drive module when the power is cut off.

8. An electric wheelchair, characterized in that: The electromagnetic brake structure comprises the electromagnetic brake structure as described in any one of claims 1 to 7.

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