Down-rotating electric step

Abstract

The utility model belongs to electric step technology field especially for the lower rotation electric step, including support assembly, connecting assembly, pedal face subassembly, drive assembly, protection component and motor cover subassembly, still include: connecting assembly is connected in the lower end of two groups of support assembly through bolt, and the other end of connecting assembly is connected with pedal face subassembly, drive assembly is connected in the outside of a group of connecting assembly, and the inside of two groups of connecting assembly is provided with protection component, motor cover subassembly is set up in the outside of drive assembly, the utility model discloses, through support assembly, the distance of pedal and ground, the inside bottom plate can be adjusted, and the height difference of step extension and recovery is small, can satisfy the demand of different chassis height car type, and the connecting end of support assembly passes through the welding connection, can guarantee the stability of support assembly, and the pedal body width increases, and the support structure of cooperation T type block and T type slot effectively reduces the pedal subsidence, prevents the sand paste of slipping simultaneously and promotes the tread safety.

Description

Technical Field

[0001] This utility model relates to the field of electric stepper technology, specifically a downward rotating electric stepper. Background Technology

[0002] Electric running boards are automatic retractable automotive assistance devices, primarily used in high-chassis vehicles (to provide convenience for getting in and out of the vehicle). The retraction mechanism is triggered by a door opening / closing signal; the board extends when the door is opened and automatically retracts under the vehicle when the door is closed. Core components include an aluminum alloy running board, a dual-motor drive system, a four / six-link telescopic mechanism, and an anti-slip coating.

[0003] Among existing automotive auxiliary step technologies, downward-rotating electric steps are widely used in vehicles that require space saving because they can extend and retract through a downward rotation. However, existing downward-rotating electric steps have a fixed and large height difference between the extended and retracted states, which cannot be flexibly adjusted according to the needs of different vehicle models (such as buses and RVs with different chassis heights), thus limiting their applicability. At the same time, some step surfaces are narrow and the step support structure is weak, making them prone to sinking when stepped on, affecting the user experience and safety, thus greatly reducing the applicability of downward-rotating electric steps.

[0004] Therefore, we proposed a downward-rotating electric stepper to solve the above problems. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this utility model provides a downward-rotating electric step, which solves the problems mentioned in the background art, such as the fixed and large height difference between the extended and retracted states during use, which makes it impossible to flexibly adjust according to the needs of different vehicle models (such as buses and RVs with different chassis heights), thus limiting its applicability. In addition, some step surfaces are narrow and the step support structure is weak, making it easy for the step to sink when stepped on.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0009] The downward-swivel electric stepper includes a support assembly, a connecting assembly, a pedal surface assembly, a drive assembly, a protective assembly, and a motor cover assembly, and also includes:

[0010] The connecting component is bolted to the lower end of the two sets of bracket assemblies, and the other end of the connecting component is connected to the pedal surface assembly;

[0011] The drive component is connected to the outside of a set of connecting components, and protective components are provided on the inside of the two sets of connecting components;

[0012] The drive assembly includes a motor fixing assembly, a motor movable plate assembly, a motor assembly, and a drive shaft. The motor fixing assembly is located on the outside of the connecting assembly. The motor movable plate assembly is connected to one side of the motor fixing assembly. The motor assembly is fixed to one side of the motor movable plate assembly. The drive shaft is laterally connected to the inside of the two sets of connecting assemblies and is laterally snapped into the inside of the protective assembly.

[0013] The motor cover assembly is located on the outside of the drive assembly and is used to protect the drive assembly.

[0014] Furthermore, the connecting assembly includes a fixed base, a power arm, a support arm, an extension arm, a connecting shaft, a motor shaft wedge, a plug, and a shaft assembly. The fixed base is connected to one end of the power arm via a drive shaft, and the power arm is fixed to the drive shaft via a motor shaft wedge. The fixed base is connected to one end of the support arm via a connecting shaft, and the connecting shaft is fixed to the support arm via bolts. The extension arm is connected to the other end of the power arm and the other end of the support arm via bolts through the connecting shaft.

[0015] Furthermore, the shaft assembly is provided in two sets. One set of shaft assemblies is installed in the rear hole of the fixed seat and has a built-in drive shaft. The other set of shaft assemblies is installed in the front hole of the fixed seat and in the four holes of the extension arm, and has a connecting shaft installed inside. The plug is installed in the front hole of the power arm and on the outside of the extension arm.

[0016] Furthermore, a retraction rubber pad and an extension rubber pad are installed on the outer side of the power arm, and a T-shaped block is installed in the groove of the front section of the extension arm.

[0017] Furthermore, the pedal surface assembly includes a pedal body, a left end cover, a right end cover, a front anti-slip sand sticker, and left and right anti-slip sand stickers. The left end cover and the right end cover are symmetrically installed on the left and right sides of the pedal body, respectively. The front anti-slip sand sticker is installed at the front end of the pedal body, and the left and right anti-slip sand stickers are pasted on the outer sides of the left end cover and the right end cover.

[0018] Furthermore, the rear end of the pedal body is symmetrically provided with T-shaped grooves, and a T-shaped block is provided inside the T-shaped groove and connected to the extension arm.

[0019] Furthermore, the drive assembly includes a motor fixing assembly, a motor movable plate assembly, a first connecting rod, a second connecting rod, a motor assembly, a drive shaft, a first sliding groove, a second sliding groove, a tension spring, a positioning pin, a drive shaft, a motor bracket, a drive shaft gear, a motor gear, a manual return end, and an R-type pin. The motor fixing assembly is installed in the pre-drilled holes of the fixing seat by bolts. The motor assembly is fixed to the outside of the motor movable plate assembly and secured by nuts on the drive shaft, the first sliding groove, and the second sliding groove. One end of the motor bracket is installed at the output end of the motor assembly, and the other end is fixed to the motor movable plate assembly. The drive shaft gear meshes with the motor gear. One end of the first connecting rod is fixed to the upper end of the motor movable assembly, and the other end is fixed to the second connecting rod. The other end of the second connecting rod is fixed to the motor fixing assembly and connected to the first connecting rod. A tension spring is fixed to the other end of the first connecting rod, and the other end of the tension spring is fixed to the motor fixing assembly.

[0020] Furthermore, a positioning pin is installed in the positioning hole between the motor fixing assembly and the motor movable plate assembly, and a manual return end is connected to the lower end of the motor movable plate assembly and connected by an R-type pin.

[0021] Furthermore, the protective assembly includes a connecting bushing, a set screw, and a connecting shaft hole. The connecting bushings are symmetrically arranged inside the connecting assembly. The connecting bushings have a connecting shaft hole inside and the connecting shaft hole is fitted onto the outside of the drive shaft. The set screws are symmetrically arranged at both ends of the connecting bushings and limit the connection between the two sets of connecting bushings.

[0022] Furthermore, the motor cover assembly includes a cover housing one, a cover housing two, and positioning bolts. The cover housing one and the cover housing two are fixed together as a whole by rivets. The positioning bolts are installed in the screw holes reserved outside the fixing seat, and the motor cover assembly covers and is disposed on the outside of the drive assembly.

[0023] (III) Beneficial Effects

[0024] Compared with the prior art, the present invention provides a downward rotating electric stepper, which has the following beneficial effects:

[0025] This invention features an adjustable support assembly that allows for easy adjustment of the distance between the pedal and the ground / vehicle floor. The minimal height difference between the extended and retracted pedal heights accommodates vehicles with varying chassis heights. The welded connection of the support assembly ensures stability. The increased pedal width, combined with the T-block and T-slot support structure, effectively reduces pedal sinking. Anti-slip sandpaper enhances safety during pedaling. Bushings one and two, along with end caps one and two, prevent foreign objects from entering the gap between the shaft and bushings. The motor cover assembly encloses the motor assembly, further enhancing protection and reducing malfunctions. The retractable and extended rubber pads provide cushioning during pedaling, reducing collision noise and impact wear. The manual return end is located at the bottom of the pedal, avoiding interference with the vehicle's side skirts and providing ample operating space. Removing the locating pin and turning the manual return end disengages the gear, allowing the pedal to return to its manual position. Attached Figure Description

[0026] Figure 1 This is a top view schematic diagram of the downward-rotating electric stepper of this utility model;

[0027] Figure 2 This is a schematic diagram of the unfolded downward-spinning electric step of this utility model;

[0028] Figure 3 This is a schematic diagram of the downward-spinning electric step retraction of this utility model;

[0029] Figure 4 This is a front view schematic diagram of the connecting component of this utility model;

[0030] Figure 5 This is a top view of the connecting component of this utility model;

[0031] Figure 6 This utility model Figure 5 Schematic diagram of the cross-section at point AA;

[0032] Figure 7 This is a top view of the pedal surface assembly of this utility model;

[0033] Figure 8 This is a top view of the drive component of this utility model;

[0034] Figure 9 This is a front view schematic diagram of the drive component of this utility model;

[0035] Figure 10 This is a rear view schematic diagram of the drive component of this utility model;

[0036] Figure 11 This is a left-side view of the drive assembly of this utility model;

[0037] Figure 12 This is a top view of the protective component of this utility model;

[0038] Figure 13 This is a top view of the motor cover assembly of this utility model.

[0039] In the diagram: 1. Bracket assembly; 2. Connecting assembly; 201. Fixing base; 202. Power arm; 203. Support arm; 204. Extending arm; 205. Connecting shaft; 206. Connecting shaft; 207. Motor shaft wedge; 208. Recycled rubber pad; 209. Extending rubber pad; 210. T-block; 211. End cap; 212. Shaft assembly; 3. Pedal surface assembly; 301. Pedal body; 302. Left end cap; 303. Right end cap; 304. Front anti-slip mat; 305. Left and right anti-slip mats; 306. T-slot; 4. Drive assembly; 401. Motor fixing assembly; 02. Motor movable plate assembly; 403. Connecting rod 1; 404. Connecting rod 2; 405. Motor assembly; 406. Drive shaft; 407. Slide rail 1; 408. Slide rail 2; 409. Tension spring; 410. Positioning pin; 411. Drive shaft; 412. Motor bracket; 413. Drive shaft gear; 414. Motor gear; 415. Manual return end; 416. R-type pin; 5. Protective assembly; 501. Connecting bushing; 502. Set screw; 503. Connecting shaft hole; 6. Motor cover assembly; 601. Cover housing 1; 602. Cover housing 2; 603. Positioning bolt. Detailed Implementation

[0040] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0041] Example

[0042] like Figure 1-13 As shown, one embodiment of the present invention provides a downward-rotating electric stepper, including a support assembly 1, a connecting assembly 2, a pedal surface assembly 3, a drive assembly 4, a protective assembly 5, and a motor cover assembly 6, and further including:

[0043] The bracket assembly 1 serves as the mounting base for the overall structure, used to fix it to the vehicle chassis or body. There are two sets of connecting assemblies 2, symmetrically connected to the lower ends of the two sets of bracket assemblies 1 by bolts. The output end of the connecting assembly 2 extends to connect to the pedal surface assembly 3, used to drive the downward extension and retraction of the pedal surface assembly 3. In addition, the drive assembly 4 is connected to the outside of one set of connecting assemblies 2, providing a power source for the overall structure. The protective assembly 5 is located inside the two sets of connecting assemblies 2, used to protect the connecting shaft system between the connecting assembly 2 and the drive assembly 4. At the same time, the motor cover assembly 6 is located on the outside of the drive assembly 4, used to protect the motor and transmission components of the drive assembly 4.

[0044] Connecting component 2 is bolted to the lower ends of the two sets of bracket components 1, and the other end of connecting component 2 is connected to the pedal surface component 3. Connecting component 2 includes a fixed base 201, a power arm 202, a support arm 203, an extension arm 204, a connecting shaft 205, a connecting shaft 206, a motor shaft wedge 207, a plug 211, and a shaft assembly 212. The fixed base 201 is connected to one end of the power arm 202 via a drive shaft 411, and the power arm 202 is fixed to the drive shaft 411 via the motor shaft wedge 207. The fixed base 201 is connected to one end of the support arm 203 via a connecting shaft 206, and the connecting shaft 206 is fixed to the support arm 203 via bolts. The extension arm... The other end of the power arm 202 and the other end of the support arm 203 are connected by bolts through the connecting shaft 206; the fixed seat 201 is connected to one end of the power arm 202 through the drive shaft 411 of the drive assembly 4, and the power arm 202 and the drive shaft 411 are circumferentially fixed by the motor shaft wedge 207 to ensure that the power transmission is slip-free, while the connecting shaft 206 is axially fixed to the support arm 203 by bolts to prevent axial movement. Furthermore, the extension arm 204 is bolted to the other end of the power arm 202 and the other end of the support arm 203 through the connecting shaft 206, forming a four-bar linkage structure of "fixed seat-power arm / support arm-extension arm" to improve motion stability.

[0045] Two sets of shaft assemblies 212 are provided. One set of shaft assemblies 212 is installed in the rear hole of the fixed base 201 and has a built-in drive shaft 411. The other set of shaft assemblies 212 is installed in the front hole of the fixed base 201 and in the four holes of the extension arm 204, and has a connecting shaft 206 installed inside. The plug 211 is installed in the front hole of the power arm 202 and on the outside of the extension arm 204. One set is embedded in the rear hole of the fixed base 201, with the drive shaft 411 passing through it to reduce wear between the drive shaft 411 and the fixed base 201. The other set is installed in the front hole of the fixed base 201 and in the four holes of the extension arm 204, with the connecting shaft 206 passing through it to reduce the rotational friction of the connecting shaft 206. Furthermore, the plug 211 is installed in the front end hole of the power arm 202 and the outer side hole of the extension arm 204 to prevent dust and impurities from entering the shaft hole; a retraction rubber pad 208 and an extension rubber pad 209 are installed on the outer side of the power arm 202, and a T-shaped block 210 is installed in the groove of the front section of the extension arm 204; the retraction rubber pad 208 and the extension rubber pad 209 are pasted on the outer side of the power arm 202: when the step is retracted into place, the retraction rubber pad 208 abuts against the fixed seat 201 to buffer the retraction impact; when the step is extended into place, the extension rubber pad 209 abuts against the limiting structure to buffer the extension impact; at the same time, the T-shaped block 210 is fixed in the groove of the front section of the extension arm 204 for connection with the pedal surface assembly 3.

[0046] The pedal assembly 3 includes a pedal body 301, a left end cover 302, a right end cover 303, a front anti-slip mat 304, and left and right anti-slip mats 305. The left end cover 302 and the right end cover 303 are symmetrically installed on the left and right sides of the pedal body 301, respectively. The front anti-slip mat 304 is installed at the front end of the pedal body 301, and the left and right anti-slip mats 305 are attached to the outer sides of the left end cover 302 and the right end cover 303. The pedal body 301 is made of aluminum alloy. The material is lightweight and high-strength. The left end cover 302 and the right end cover 303 are symmetrically installed on the left and right sides by bolts to close the side opening of the pedal body 301 and enhance the protection of the pedal edge. Then, the front anti-slip sand sticker 304 is pasted on the front surface of the pedal body 301, and the left and right anti-slip sand stickers 305 are pasted on the outer surfaces of the left end cover 302 and the right end cover 303. The anti-slip sand stickers are made of silicon carbide particles to improve the anti-slip performance in wet and oily environments.

[0047] The rear end of the pedal body 301 is symmetrically provided with T-shaped grooves 306, and a T-shaped block is provided inside the T-shaped groove 306 and connected to the extension arm 204; the rear end of the pedal body 301 is symmetrically provided with T-shaped grooves 306, the T-shaped grooves 306 and the T-shaped blocks 210 on the extension arm 204 slide in engagement and are locked by bolts, so as to realize the quick assembly and disassembly of the pedal surface assembly 3 and the connecting assembly 2;

[0048] The drive component 4 is connected to the outside of a set of connecting components 2, and the inner sides of the two sets of connecting components 2 are provided with protective components 5;

[0049] The drive assembly 4 includes a motor fixing assembly 401, a motor movable plate assembly 402, a motor assembly 405, and a drive shaft 411. The motor fixing assembly 401 is disposed on the outside of the connecting assembly 2. The motor movable plate assembly 402 is connected to one side of the motor fixing assembly 401. The motor assembly 405 is fixed to one side of the motor movable plate assembly 402. The drive shaft 411 is laterally connected to the inside of the two sets of connecting assemblies 2, and the drive shaft 411 is laterally snapped into the inside of the protective assembly 5.

[0050] Drive assembly 4 includes a motor mounting assembly 401, a motor movable plate assembly 402, a first connecting rod 403, a second connecting rod 404, a motor assembly 405, a drive shaft 406, a first sliding groove 407, a second sliding groove 408, a tension spring 409, a locating pin 410, a drive shaft 411, a motor bracket 412, a drive shaft gear 413, a motor gear 414, a manual return end 415, and an R-type pin 416. The motor mounting assembly 401 is bolted into the space reserved in the mounting base 201, and the motor assembly 405 is fixed to the motor movable plate. The outer side of the movable plate assembly 402 is secured by nuts on the drive shaft 406, slide rail 407, and slide rail 408. One end of the motor bracket 412 is mounted on the output end of the motor assembly 405, and the other end is fixed to the motor movable plate assembly 402. The drive shaft gear 413 meshes with the motor gear 414. One end of the connecting rod 403 is fixed to the motor fixing assembly 401, and the other end is fixed to the connecting rod 404. The other end of the connecting rod 404 is fixed to the upper end of the motor movable plate assembly 402, and the other end is connected to the connecting rod 404. The connecting rod 403 is connected to the motor assembly 402. A tension spring 409 is fixed to the other end of the connecting rod 403, and the other end of the tension spring 409 is fixed to the motor mounting assembly 401. The motor mounting assembly 401 is bolted into the pre-drilled holes in the mounting base 201 of the connecting assembly 2, providing a fixed foundation for the drive assembly 4. The motor assembly 405 is fixed to the outside of the motor movable plate assembly 402 via a motor bracket 412. One end of the motor bracket 412 is connected to the output flange of the motor assembly 405, and the other end is bolted to the motor... On the movable plate assembly 402, the motor is securely installed, while the motor gear 414 is fixed on the output shaft of the motor assembly 405, and the drive shaft gear 413 is fixed to one end of the drive shaft 411; the transmission shaft 406 passes through the motor movable plate assembly 402 and is fastened by nuts on the first slide rail 407 and the second slide rail 408. The first slide rail 407 and the second slide rail 408 are used to adjust the position of the motor movable plate assembly 402 to ensure reasonable gear meshing clearance; the tension spring 409 is used to assist the motor movable plate assembly 402 in resetting and reduce the motor load;

[0051] A positioning pin 410 is installed in the positioning hole between the motor fixing assembly 401 and the motor movable plate assembly 402. The lower end of the motor movable plate assembly 402 is connected to a manual return end 415 and is connected to it by an R-type pin 416. Positioning holes are opened at corresponding positions of the motor fixing assembly 401 and the motor movable plate assembly 402, and positioning pins 410 are installed in the positioning holes to limit the initial position of the motor movable plate assembly 402. At the same time, a manual return end 415 is welded to the lower end of the motor movable plate assembly 402. The manual return end 415 is connected to the motor movable plate assembly 402 by an R-type pin 416. When the motor fails, the R-type pin 416 can be pulled out and the manual return end 415 can be pulled to move the motor movable plate assembly 402, so as to realize the manual retraction of the step.

[0052] The protective assembly 5 includes a connecting bushing 501, a set screw 502, and a connecting shaft hole 503. The connecting bushings 501 are symmetrically arranged inside the connecting assembly 2. The connecting bushings 501 have a connecting shaft hole 503 inside, which is fitted onto the outside of the drive shaft 411. The set screws 502 are symmetrically arranged at both ends of the connecting bushings 501 and limit the connection between the two sets of connecting bushings 501. The connecting bushings 501 are made of stainless steel and are symmetrically arranged on the fixing seats of the two sets of connecting assemblies 2. Inside the 201, the connecting sleeve 501 has an axially formed connecting shaft hole 503. The connecting shaft hole 503 is clearance-fitted with the drive shaft 411 and is sleeved on the outside of the drive shaft 411 to prevent the drive shaft 411 from directly contacting and wearing with the fixed seat 201. At the same time, the set screws 502 are symmetrically screwed into the radial threaded holes at both ends of the connecting sleeve 501. The ends of the set screws 502 abut against the surface of the drive shaft 411, thereby fixing the connecting sleeve 501 and the drive shaft 411 relative to each other and facilitating disassembly and maintenance.

[0053] The motor cover assembly 6 is located on the outside of the drive assembly 4 and is used to protect the drive assembly 4. The motor cover assembly 6 includes a first cover housing 601, a second cover housing 602, and a positioning bolt 603. The first cover housing 601 and the second cover housing 602 are fixed as a whole by rivets. The positioning bolt 603 is installed in the screw hole reserved on the outside of the fixing seat 201, and the motor cover assembly 6 covers the outside of the drive assembly 4. The first cover housing 601 and the second cover housing 602 are both made of ABS engineering plastic and are fixed as a whole by rivets to form a fully enclosed protective shell. The positioning bolt 603 passes through the flange hole of the first cover housing 601 and the second cover housing 602 and is screwed into the screw hole reserved on the outside of the fixing seat 201 to fix the motor cover assembly 6. At the same time, sound insulation cotton is pasted on the inside of the motor cover assembly 6, which can reduce the noise of the motor during operation and prevent rainwater and dust from entering the interior of the drive assembly 4.

[0054] During use, the extension process is as follows: the motor assembly 405 is powered on and rotates forward, driving the motor gear 414 to rotate, which in turn drives the drive shaft 411 to rotate through gear meshing; the drive shaft 411 drives the power arm 202 to rotate downward around the drive shaft 411 through the motor shaft wedge 207, while the support arm 203 rotates synchronously around the connecting shaft 206, together pushing the extension arm 204 to extend outward; when the extension arm 204 drives the pedal surface assembly 3 to rotate downward to the horizontal position, the extension rubber pad 209 abuts against the limiting structure of the fixed seat 201, the motor assembly 405 is de-energized, and the step is extended into place;

[0055] If the recycling process is as follows: the motor assembly 405 is powered on and reverses, the drive shaft 411 rotates in the opposite direction, the power arm 202 and the support arm 203 drive the extension arm 204 to retract inward; the tension spring 409 pulls the first connecting rod 403 and the second connecting rod 404, the auxiliary motor movable plate assembly 402 is reset, and the motor load is reduced; when the pedal surface assembly 3 is retracted to fit against the side of the vehicle, the recycling rubber pad 208 abuts against the fixed seat 201, the motor assembly 405 is de-energized, and the recycling is completed;

[0056] Finally, in the event of a motor or circuit failure, pull out the R-pin 416 and the positioning pin 410, pull the manual return end 415 to move the motor movable plate assembly 402, and then complete the subsequent recycling.

[0057] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A downward-rotating electric stepper, comprising a support assembly (1), a connecting assembly (2), a pedal surface assembly (3), a drive assembly (4), a protective assembly (5), and a motor cover assembly (6), characterized in that, Also includes: The connecting component (2) is bolted to the lower end of the two sets of bracket components (1), and the other end of the connecting component (2) is connected to the pedal surface component (3); A drive component (4) is connected to the outside of a set of connecting components (2), and a protective component (5) is provided on the inside of the two sets of connecting components (2); The drive assembly (4) includes a motor fixing assembly (401), a motor movable plate assembly (402), a motor assembly (405), and a drive shaft (411). The motor fixing assembly (401) is located on the outside of the connecting assembly (2). The motor movable plate assembly (402) is connected to one side of the motor fixing assembly (401). The motor assembly (405) is fixed to one side of the motor movable plate assembly (402). The drive shaft (411) is laterally connected to the inside of the two sets of connecting assemblies (2), and the drive shaft (411) is laterally snapped into the inside of the protective assembly (5). The motor cover assembly (6) is located on the outside of the drive assembly (4) and is used to protect the drive assembly (4).

2. The downward-rotating electric stepper according to claim 1, characterized in that: The connecting assembly (2) includes a fixed base (201), a power arm (202), a support arm (203), an extension arm (204), a connecting shaft (205), a connecting shaft (206), a motor shaft wedge (207), a plug (211), and a shaft assembly (212). The fixed base (201) is connected to one end of the power arm (202) via a drive shaft (411). The power arm (202) is fixed to the drive shaft (411) via a motor shaft wedge (207). The fixed base (201) is connected to one end of the support arm (203) via a connecting shaft (206). The connecting shaft (206) is fixed to the support arm (203) via bolts. The extension arm (204) is connected to the other end of the power arm (202) and the other end of the support arm (203) via bolts through the connecting shaft (206).

3. The downward-rotating electric stepper according to claim 2, characterized in that: The shaft assembly (212) is provided in two sets. One set of shaft assembly (212) is located in the rear hole of the fixed base (201) and the shaft assembly (212) has a built-in drive shaft (411). The other set of shaft assembly (212) is installed in the front hole of the fixed base (201) and in the four holes of the extension arm (204), and a connecting shaft (206) is installed inside. The plug (211) is installed in the front hole of the power arm (202) and on the outside of the extension arm (204).

4. The downward-rotating electric stepper according to claim 3, characterized in that: The power arm (202) is equipped with a retraction rubber pad (208) and an extension rubber pad (209) on its outer side, and a T-block (210) is installed in the groove of the front section of the extension arm (204).

5. The downward-rotating electric stepper according to claim 1, characterized in that: The pedal surface assembly (3) includes a pedal body (301), a left end cover (302), a right end cover (303), a front anti-slip mat (304), and left and right anti-slip mats (305). The left end cover (302) and the right end cover (303) are symmetrically installed on the left and right sides of the pedal body (301), respectively. The front anti-slip mat (304) is installed at the front end of the pedal body (301), and the left and right anti-slip mats (305) are pasted on the outside of the left end cover (302) and the right end cover (303).

6. The downward-rotating electric stepper according to claim 5, characterized in that: The rear end of the pedal body (301) is symmetrically provided with T-shaped grooves (306), and a T-shaped block is provided inside the T-shaped groove (306) and connected to the extension arm (204).

7. The downward-rotating electric stepper according to claim 1, characterized in that: The drive assembly (4) includes a motor fixing assembly (401), a motor movable plate assembly (402), a first connecting rod (403), a second connecting rod (404), a motor assembly (405), a drive shaft (406), a first sliding groove (407), a second sliding groove (408), a tension spring (409), a positioning pin (410), a drive shaft (411), a motor bracket (412), a drive shaft gear (413), a motor gear (414), a manual return end (415), and an R-pin (416). The motor fixing assembly (401) is bolted into the pre-drilled holes in the fixing seat (201). The motor assembly (405) is fixed to the outside of the motor movable plate assembly (402) and connected to the drive shaft (406) and the sliding plate assembly (406). The nuts on the first groove (407) and the second sliding groove (408) are tightened. One end of the motor bracket (412) is installed on the output end of the motor assembly (405) and the other end is fixed on the motor movable plate assembly (402). The drive shaft gear (413) meshes with the motor gear (414). One end of the first connecting rod (403) is fixed on the upper end of the motor movable plate assembly (402) and the other end is fixed on the second connecting rod (404). The other end of the second connecting rod (404) is fixed on the motor fixing assembly (401) and the other end is connected to the first connecting rod (403). The other end of the first connecting rod (403) is fixed with a tension spring (409) and the other end of the tension spring (409) is fixed on the motor fixing assembly (401).

8. The downward-rotating electric stepper according to claim 7, characterized in that: A positioning pin (410) is installed in the positioning hole between the motor fixing assembly (401) and the motor movable plate assembly (402). The lower end of the motor movable plate assembly (402) is connected to a manual return end (415) and is connected to it by an R-type pin (416).

9. The downward-rotating electric stepper according to claim 1, characterized in that: The protective assembly (5) includes a connecting bushing (501), a set screw (502), and a connecting shaft hole (503). The connecting bushing (501) is symmetrically arranged inside the connecting assembly (2). The connecting bushing (501) has a connecting shaft hole (503) inside and is fitted onto the outside of the drive shaft (411). The set screw (502) is symmetrically arranged at both ends of the connecting bushing (501) and limits the connection between the two sets of connecting bushings (501).

10. The downward-rotating electric stepper according to claim 1, characterized in that: The motor cover assembly (6) includes a cover housing one (601), a cover housing two (602) and a positioning bolt (603). The cover housing one (601) and the cover housing two (602) are fixed together by rivets. The positioning bolt (603) is installed in the screw hole reserved outside the fixing seat (201), and the motor cover assembly (6) covers the outside of the drive assembly (4).

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