Ultra-slight silence power-saving type brushless motor primary speed reducer assembly for wheelchair

Abstract

The utility model relates to the technical field of wheelchair drivers, in particular to an ultra-slight silence power-saving type brushless motor primary reducer assembly for a wheelchair, which comprises a shell, an ultra-small brushless motor for the wheelchair, a primary gear, a secondary gear and an output shaft, the ultra-small brushless motor for the wheelchair is arranged on the shell, the diameter of the primary gear is smaller than that of the secondary gear, and the output shaft is arranged on the shell. A rotating shaft of the ultra-small brushless motor for the wheelchair extends into the shell, the first-stage gear is installed at the end, located in the shell, of the rotating shaft of the ultra-small brushless motor for the wheelchair, the output shaft is rotationally installed on the shell, the second-stage gear is installed in the shell, and the center line of the second-stage gear is fixedly connected with the output shaft. The reduction gearbox has the advantages of being light in weight, low in noise and large in torque, and meanwhile braking of the reduction gearbox can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of wheelchair drivers, and specifically relates to an ultra-light, silent, and power-saving brushless motor primary reducer assembly used on a wheelchair. Background Art

[0002] A reduction box is called a speed reducer or a reducer. Its main purpose is to reduce the output of the motor or increase the output of the motor. The combination of the reduction box and the brushless motor can be used in various fields, especially in the field of mechanical transmission. The utility model is mainly aimed at the brushless motor reduction box assembly on the wheelchair. Since most wheelchair users are injured, sick or elderly people, the performance of the wheelchair itself needs to be stable and comfortable, and the movement and transmission of the wheelchair need to be applied to the brushless motor reduction box assembly to achieve. In order to achieve the torque that can be used for the operation of the wheelchair, the current motor has an increased design volume, which increases the weight of the wheelchair and reduces the endurance of the wheelchair. It also increases the burden when the wheelchair needs to be carried. In order to increase the endurance of the wheelchair and reduce the weight of the wheelchair, the current solution is to reduce the size of the motor. However, the reduction in the size of the motor will lead to a reduction in the output torque of the motor, resulting in the wheelchair being unable to operate due to too small a torque during use. Utility Model Content

[0003] In view of the deficiencies in the prior art, the purpose of the utility model is to provide an ultra-light, silent and energy-saving brushless motor primary reducer assembly for use in a wheelchair.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a super light, silent and energy-saving brushless motor primary reducer assembly for a wheelchair, comprising a shell, a super small brushless motor for a wheelchair arranged on the shell, a primary gear, a secondary gear, and an output shaft, wherein the diameter of the primary gear is smaller than the diameter of the secondary gear, the rotating shaft of the super small brushless motor for a wheelchair is extended into the shell, the primary gear is installed on one end of the rotating shaft of the super small brushless motor for a wheelchair located in the shell, the output shaft is rotatably installed on the shell, the secondary gear is installed in the shell, and the center line of the secondary gear is fixedly connected to the output shaft, and the secondary gear is meshed with the primary gear.

[0005] In some embodiments, the primary gear and the secondary gear are both helical gears.

[0006] In some of the embodiments, rolling bearings are provided on the housing at both ends of the rotating shaft and at both ends of the output shaft corresponding to the ultra-small brushless motor for the wheelchair.

[0007] In some of the embodiments, the ultra-small brushless motor for wheelchairs is an ultra-light, silent and energy-saving motor for reducers on wheelchairs, which includes a motor housing and end cover that cooperate with each other, and a stator, a rotor and a control panel arranged in the motor housing and the end cover. The stator is installed around the inner wall of the motor housing, and an even number of winding poles are evenly arranged on the inner circumference of the stator, each winding pole is provided with a coil winding, and all the winding poles are surrounded to form a rotating groove, and the rotor is arranged in the rotating groove. The rotor includes a rotating shaft, a rotating block and a permanent magnet. The rotating shaft passes through the center of the rotating block and is fixedly arranged. Four mounting grooves are evenly arranged in the circumferential direction of the rotating block, each A permanent magnet is fixedly installed in each mounting groove, bearings are respectively arranged at both ends of the rotating shaft, one bearing is fixed on the end cover, and the other bearing is fixed on the tail end of the motor housing, the control board is installed in the end cover, and the wire terminals of all coil windings are connected to the corresponding connection points on the control board, and a plurality of heat dissipation rings are evenly arranged on the outer side of the motor housing from the end to the tail, and the heat dissipation rings are integrally formed with the motor housing, a guide groove is arranged on the inner side wall of the motor housing, a guide protrusion matching the guide groove is arranged on the outer side wall of the stator, and a plurality of vertical heat conduction protrusions are evenly arranged on the circumference of the inner side wall of the motor housing, and the heat conduction protrusions are in contact with the outer side wall of the stator.

[0008] In some of the embodiments, the motor housing and the heat dissipation ring are both made of lightweight aluminum or cast aluminum alloy.

[0009] In some of the embodiments, a manual brake cooperating with the rotating shaft is provided at the external rear end of the motor housing.

[0010] In some embodiments, the manual brake includes a mounting mechanism and a brake device, the mounting mechanism includes a mounting block, a fixed block and a locking body, the fixed block is fixed on the motor housing, and a through hole is provided at the center of the fixed block, one end of the rotating shaft located at the rear end of the motor housing passes through the through hole, the locking body is fixedly mounted on the rotating shaft, the mounting block is fixed on the fixed block, and a support rod is provided between the mounting block and the fixed block, and there are multiple support rods, and the multiple support rods are evenly arranged around the edge between the mounting block and the fixed block, the mounting block is fixedly connected to the fixed block through the support rod, the brake device is provided in cooperation with the fixed block, and the locking end of the brake device corresponds to the locking body.

[0011] In some embodiments, the brake device includes an operating rod, a push rod, a spring, a push block and a brake disc, the push block is arranged between the mounting block and the fixed block, and a notch is arranged at the edge of the push block corresponding to each support rod, the notch and the support rod are slidably matched, the brake disc is arranged between the fixed block and the push block, and the brake disc is matched with the locking body, a sliding hole is arranged at the central axis of the mounting block, the push rod is slidably installed in the sliding hole, the spring is sleeved on the push rod, and one end of the spring away from the brake disc abuts on the mounting block, and one end of the spring close to the brake disc abuts on the push rod, the operating rod is arranged on a side end of the mounting block away from the brake disc, and the operating rod is fixedly connected to one end of the push rod away from the brake disc, the operating rod is provided on a side surface of the operating rod corresponding to the mounting block, at least two limiting holes are provided, each limiting hole is provided in a steel ball, and a sliding groove is provided on the mounting block corresponding to each steel ball, the sliding groove is arranged as an oblique groove, and each steel ball is driven by the operating rod to slide in the corresponding sliding groove.

[0012] In some embodiments, an arc-shaped limit groove is provided on the operating rod, and a limit rod is provided on the mounting block corresponding to the arc-shaped limit groove. The slide groove consists of a positioning hole one, a slideway and a positioning hole two. The spherical depth of the positioning hole one is greater than the spherical depth of the positioning hole two. The slideway is located on the surface of the mounting block, and the two ends of the slideway are respectively connected to the positioning hole one and the positioning hole two.

[0013] In some embodiments, a contact switch is provided on one side surface of the operating rod on the mounting block, and a switch button of the contact switch is provided toward an edge of the operating rod, and a protrusion is provided on the edge of the operating rod corresponding to the switch button of the contact switch.

[0014] Compared with the prior art, the utility model has the following beneficial effects: by improving the structure of the motor used in the wheelchair, removing the fan, and adding a heat dissipation ring structure, the heat continuously dissipated during the stable operation of the motor is basically the same as that of the motor with a fan;

[0015] By removing the fan structure, the wheelchair's operating energy consumption was reduced by 40% under the same electrical capacity.

[0016] The fanless structure makes the motor produce less noise when running, which can achieve a silent motor effect and improve the user's comfort.

[0017] By adding a first-stage reduction assembly, the output torque of the motor is increased, and then connected with the rear-stage reduction box to achieve high-torque operation of the wheelchair;

[0018] By setting the brake device, the motor can be braked, so that the motor and the reduction box stop working, and the initial state of the motor is a braking state. After human operation, the brake can be separated, so that the motor can run and drive the reduction box to run, thereby ensuring the reliability of the wheelchair.

[0019] Details of one or more embodiments of the present application are presented in the following drawings and descriptions to make other features, purposes and advantages of the present application more concise and understandable. The present application is fully described and understood through the embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the utility model;

[0021] Figure 2 for Figure 1 Schematic diagram of the internal structure of the shell;

[0022] Figure 3 for Figure 1 A cross-sectional view of

[0023] Figure 4 This is a schematic diagram of the structure of the utility model after adding a hand brake;

[0024] Figure 5 This is a schematic diagram of the structure of an ultra-small brushless motor for a wheelchair;

[0025] Figure 6 for Figure 5 A cross-sectional view of the motor;

[0026] Figure 7 for Figure 5 The schematic diagram of the structure of the motor after adding a hand brake;

[0027] Figure 8 for Figure 7 The cross-sectional view of the motor and the hand brake after they are matched;

[0028] Fig. 9 for Figure 8 Bottom view of the middle mounting block;

[0029] Fig.10 for Figure 8 Top view of the middle operating lever;

[0030] Fig.11 Cross-sectional view of the matching relationship between the mounting block, operating lever and steel ball of the hand brake Figure 1 ;

[0031] Fig.12 Cross-sectional view of the matching relationship between the mounting block, operating lever and steel ball of the hand brake Figure 2 .

[0032] In the figure: 1, motor housing; 2, end cover; 3, stator; 4, rotor; 5, control board; 6, shaft; 7, rotating block; 8, heat dissipation ring; 9, guide groove; 10, guide protrusion; 11, rear cover; 12, hand brake; 13, operating lever; 14, mounting block; 15, push rod; 16, spring; 17, push block; 18, brake disc; 19, locking body; 20, fixed block; 21, support rod; 22, sliding hole ; 23. Steel ball; 24. Arc limit groove; 25. Limit rod; 26. Slide groove; 27. Positioning hole one; 28. Slideway; 29. ​​Positioning hole two; 30. Contact switch; 31. Protrusion; 32. Winding column; 33. Permanent magnet; 34. Heat-conducting protrusion; 35. Shell; 36. Primary gear; 37. Secondary gear; 38. Output shaft; 39. Rolling bearing; 40. Ultra-small brushless motor for wheelchair. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Example

[0034] See also Figure 1-4 The utility model provides a technical solution: a super light, silent and energy-saving brushless motor primary reducer assembly for a wheelchair, characterized in that it includes a shell, a super small brushless motor for a wheelchair arranged on the shell, a primary gear, a secondary gear, and an output shaft, the diameter of the primary gear is smaller than the diameter of the secondary gear, the rotating shaft of the super small brushless motor for a wheelchair is extended into the shell, the primary gear is installed on one end of the rotating shaft of the super small brushless motor for a wheelchair located in the shell, the output shaft is rotatably installed on the shell, the secondary gear is installed in the shell, and the center line of the secondary gear is fixedly connected to the output shaft, and the secondary gear is meshed with the primary gear.

[0035] The first-stage gear and the second-stage gear are both helical gears. Through the arrangement of the helical gears, the overlap is large, the load on each pair of gears is reduced, and the bearing capacity of the gears is improved.

[0036] Rolling bearings are arranged on the shell at both ends of the rotating shaft and the output shaft of the ultra-small brushless motor for wheelchairs. The arrangement of the rolling bearings can stabilize the rotation of the rotating shaft and the output shaft with the shell, while improving the structural stability. Example

[0037] Based on the above scheme, see Figure 5-6 When using an ultra-small brushless motor for a wheelchair, an ultra-light, silent and energy-saving motor for a reduction box on a wheelchair is used, which includes a motor housing and an end cover that cooperate with each other, and a stator, a rotor and a control panel arranged in the motor housing and the end cover. The stator is mounted on the inner wall of the motor housing in a circumferential manner, and an even number of winding posts are evenly arranged on the inner circumference of the stator. A coil winding is arranged on each winding post, and all the winding posts are surrounded to form a rotating groove. The rotor is arranged in the rotating groove, and the rotor includes a rotating shaft, a rotating block and a permanent magnet. The rotating shaft passes through the center of the rotating block and is fixedly arranged. Four mounting grooves are evenly arranged in the circumferential direction of the rotating block, and each mounting groove A permanent magnet is fixedly installed inside, bearings are respectively arranged at both ends of the rotating shaft, one bearing is fixed on the end cover, and the other bearing is fixed on the tail end of the motor shell, the control board is installed in the end cover, and the wire terminals of all coil windings are connected to the corresponding connection points on the control board, and the outer side of the motor shell is evenly arranged from the end to the tail. A plurality of heat dissipation rings are arranged, and the heat dissipation rings and the motor shell are integrally formed, and a guide groove is arranged on the inner side wall of the motor shell, and a guide protrusion matching the guide groove is arranged on the outer side wall of the stator, and a plurality of vertical heat conduction protrusions are evenly arranged on the circumference of the inner side wall of the motor shell, and the heat conduction protrusions are in contact with the outer side wall of the stator.

[0038] The motor housing and the heat dissipation ring are both made of lightweight aluminum or cast aluminum alloy. The lightweight aluminum can further reduce the weight of the motor. At the same time, the structural strength of the motor is also within the safe use range of wheelchair motors. The motor can also be made of cast aluminum alloy injection molding.

[0039] The outer surface of the heat dissipation ring is a smooth surface, which prevents oil or dust from adhering to the surface of the motor and is easy to clean after long-term use.

[0040] A rear cover is provided at the external tail end of the motor housing, and the rear cover may be provided with a manufacturer or buyer logo. At the same time, the rear cover can be provided to seal the tail end of the motor housing, so that the interior of the motor housing is in a closed state as a whole, thereby preventing external dust from entering the motor housing during use and causing wear to the internal structure of the motor.

[0041] Through this technical solution, the motor is connected to the wheelchair controller, and the motor is rotated by the controller to realize forward and reverse rotation of the motor, thereby driving the wheelchair forward, backward, or stop. Example

[0042] Based on Example 2, by referring to Figure 7-12 A manual brake that cooperates with the rotating shaft is arranged at the external tail end of the motor housing.

[0043] The hand brake includes a mounting mechanism and a brake device, the mounting mechanism includes a mounting block, a fixed block and a locking body, the fixed block is fixed on the motor housing, and a through hole is arranged at the center of the fixed block, one end of the rotating shaft located at the rear end of the motor housing passes through the through hole, the locking body is fixedly mounted on the rotating shaft, the mounting block is fixed on the fixed block, and a support rod is arranged between the mounting block and the fixed block, and there are multiple support rods, and the multiple support rods are evenly arranged around the edge between the mounting block and the fixed block, the mounting block is fixedly connected to the fixed block through the support rod, the brake device is arranged in cooperation with the fixed block, and the locking end of the brake device corresponds to the locking body.

[0044] The brake device comprises an operating rod, a push rod, a spring, a push block and a brake disc, the push block is arranged between the mounting block and the fixed block, and a notch is arranged at the edge of the push block corresponding to each support rod, the notch and the support rod are slidably matched, the brake disc is arranged between the fixed block and the push block, and the brake disc is matched with the locking body, a sliding hole is arranged at the central axis of the mounting block, the push rod is slidably mounted in the sliding hole, the spring is sleeved on the push rod, and one end of the spring away from the brake disc abuts on the mounting block, and one end of the spring close to the brake disc abuts on the push rod, the operating rod is arranged on a side end of the mounting block away from the brake disc, and the operating rod is fixedly connected to one end of the push rod away from the brake disc, the operating rod is arranged on a side surface of the mounting block corresponding to at least two limiting holes, each limiting hole is arranged in a steel ball, and a sliding groove is arranged on the mounting block corresponding to each steel ball, the sliding groove is arranged as an oblique groove, and each steel ball is driven by the operating rod to slide in the corresponding sliding groove.

[0045] An arc-shaped limit groove is arranged on the operating rod, and a limit rod is arranged on the mounting block corresponding to the arc-shaped limit groove. The slide groove consists of a positioning hole 1, a slideway and a positioning hole 2. The spherical depth of the positioning hole 1 is greater than the spherical depth of the positioning hole 2. The slideway is located on the surface of the mounting block, and the two ends of the slideway are respectively connected to the positioning hole 1 and the positioning hole 2.

[0046] A contact switch is arranged on one side surface of the operating rod on the mounting block, and the switch button of the contact switch is arranged toward the edge of the operating rod. A protrusion is arranged at the edge of the operating rod corresponding to the switch button of the contact switch. At the same time, the contact switch is connected in series to the power input end of the motor, so that the power to the motor is cut off when braking is achieved, thereby avoiding damage to the motor caused by continuous rotation of the motor in the braking state.

[0047] In the initial state, the protrusion on the operating rod presses the contact button on the contact switch, so that the contact is disconnected in the pressed state, so that the motor power is not energized. When the operating rod rotates, the protrusion separates from the contact button, the contact switch merges, and the power of the motor is turned on.

[0048] A protective shell located outside the hand brake has a slot hole on the side, an operating rod extends from the slot hole to the outside of the protective shell, and the slot hole is a long strip hole, and the operating rod can be operated and swung in the slot hole.

[0049] Through the technical solution, in the initial state, the distance between the operating rod and the mounting block is small, and the push rod drives the push block to press the brake disc through the elastic force of the spring to brake the motor. At the same time, the protrusion on the operating rod presses the contact button on the contact switch, so that the contact switch is in the disconnected state and the motor is not energized; when the operating rod is pulled, the operating rod increases the distance between the operating rod and the mounting block through the action of the steel ball, and the operating rod drives the push rod to slide into the mounting block, and then the push rod drives the push block away from the brake disc, so that the brake disc moves, and at the same time, the protrusion on the operating rod separates from the contact switch, and the contact switch is turned on, so that the motor can run.

[0050] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

[0051] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An ultra-light, silent and energy-saving brushless motor primary reducer assembly for a wheelchair, characterized in that: It includes a shell, an ultra-small brushless motor for a wheelchair arranged on the shell, a primary gear, a secondary gear, and an output shaft. The diameter of the primary gear is smaller than the diameter of the secondary gear. The rotating shaft of the ultra-small brushless motor for a wheelchair extends into the shell. The primary gear is installed on one end of the rotating shaft of the ultra-small brushless motor for a wheelchair located in the shell. The output shaft is rotatably installed on the shell. The secondary gear is installed in the shell, and the center line of the secondary gear is fixedly connected to the output shaft. The secondary gear is meshed with the primary gear.

2. The ultra-light, silent and energy-saving brushless motor primary reducer assembly for a wheelchair according to claim 1 is characterized in that: The first-stage gear and the second-stage gear are both helical gears.

3. The ultra-light, silent and energy-saving brushless motor primary reducer assembly for a wheelchair according to claim 1 is characterized in that: Rolling bearings are arranged on the shell at both ends of the rotating shaft and at both ends of the output shaft corresponding to the ultra-small brushless motor for the wheelchair.

4. The ultra-light, silent and energy-saving brushless motor primary reducer assembly for a wheelchair according to claim 1 is characterized in that: The ultra-small brushless motor for wheelchairs is an ultra-light, silent and energy-saving motor for the reduction box on wheelchairs, which includes a motor housing and an end cover that cooperate with each other, and a stator, a rotor and a control panel arranged in the motor housing and the end cover. The stator is installed around the inner wall of the motor housing, and an even number of winding posts are evenly arranged on the inner circumference of the stator. Each winding post is provided with a coil winding, and all the winding posts are surrounded to form a rotating groove. The rotor is arranged in the rotating groove. The rotor includes a rotating shaft, a rotating block and a permanent magnet. The rotating shaft passes through the center of the rotating block and is fixedly arranged. Four mounting grooves are evenly arranged in the circumferential direction of the rotating block, and each mounting groove has a A permanent magnet is fixedly installed, and bearings are respectively arranged at both ends of the rotating shaft, one bearing is fixed on the end cover, and the other bearing is fixed on the tail end of the motor shell, the control board is installed in the end cover, and the wire terminals of all coil windings are connected to the corresponding connection points on the control board, and the outer side of the motor shell is evenly arranged from the end to the tail. A plurality of heat dissipation rings are arranged, and the heat dissipation rings and the motor shell are integrally formed, and a guide groove is arranged on the inner side wall of the motor shell, and a guide protrusion matching the guide groove is arranged on the outer side wall of the stator, and a plurality of vertical heat conduction protrusions are evenly arranged on the circumference of the inner side wall of the motor shell, and the heat conduction protrusions are in contact with the outer side wall of the stator.

5. The ultra-light, silent and energy-saving brushless motor primary reducer assembly for a wheelchair according to claim 4 is characterized in that: The motor housing and the heat dissipation ring are both made of light aluminum or cast aluminum alloy.

6. The ultra-light, silent and energy-saving brushless motor primary reducer assembly for a wheelchair according to claim 4, characterized in that: A manual brake matched with the rotating shaft is arranged at the outer tail end of the motor housing.

7. The ultra-light, silent and energy-saving brushless motor primary reducer assembly for a wheelchair according to claim 6, characterized in that: The hand brake includes a mounting mechanism and a brake device, the mounting mechanism includes a mounting block, a fixed block and a locking body, the fixed block is fixed on the motor housing, and a through hole is arranged at the center of the fixed block, one end of the rotating shaft located at the rear end of the motor housing passes through the through hole, the locking body is fixedly mounted on the rotating shaft, the mounting block is fixed on the fixed block, and a support rod is arranged between the mounting block and the fixed block, and there are multiple support rods, and the multiple support rods are evenly arranged around the edge between the mounting block and the fixed block, the mounting block is fixedly connected to the fixed block through the support rod, the brake device is arranged in cooperation with the fixed block, and the locking end of the brake device corresponds to the locking body.

8. The ultra-light, silent and energy-saving brushless motor primary reducer assembly for a wheelchair according to claim 7, characterized in that: The brake device comprises an operating rod, a push rod, a spring, a push block and a brake disc, the push block is arranged between the mounting block and the fixed block, and a notch is arranged at the edge of the push block corresponding to each support rod, the notch and the support rod are slidably matched, the brake disc is arranged between the fixed block and the push block, and the brake disc is matched with the locking body, a sliding hole is arranged at the central axis of the mounting block, the push rod is slidably mounted in the sliding hole, the spring is sleeved on the push rod, and one end of the spring away from the brake disc abuts on the mounting block, and one end of the spring close to the brake disc abuts on the push rod, the operating rod is arranged on a side end of the mounting block away from the brake disc, and the operating rod is fixedly connected to one end of the push rod away from the brake disc, the operating rod is arranged on a side surface of the mounting block corresponding to at least two limiting holes, each limiting hole is arranged in a steel ball, and a sliding groove is arranged on the mounting block corresponding to each steel ball, the sliding groove is arranged as an oblique groove, and each steel ball is driven by the operating rod to slide in the corresponding sliding groove.

9. The ultra-light, silent and energy-saving brushless motor primary reducer assembly for a wheelchair according to claim 8, characterized in that: An arc-shaped limit groove is arranged on the operating rod, and a limit rod is arranged on the mounting block corresponding to the arc-shaped limit groove. The slide groove consists of a positioning hole 1, a slideway and a positioning hole 2. The spherical depth of the positioning hole 1 is greater than the spherical depth of the positioning hole 2. The slideway is located on the surface of the mounting block, and the two ends of the slideway are respectively connected to the positioning hole 1 and the positioning hole 2.

10. The ultra-light, silent and energy-saving brushless motor primary reducer assembly for a wheelchair according to claim 7, characterized in that: A contact switch is arranged on one side of the operating rod on the mounting block, and a switch button of the contact switch is arranged toward the edge of the operating rod. A protrusion is arranged on the edge of the operating rod corresponding to the switch button of the contact switch.

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