Telescopic multi-stage step device

Abstract

The utility model provides a telescopic multistage step device belongs to commercial vehicle step technical field, including mounting seat, mounting seat sets up below the cab, and mounting seat is equipped with connecting rod assembly respectively in two ends, and mounting seat is connected with step mechanism through connecting rod assembly, be equipped with drive portion on mounting seat, drive portion is connected with connecting rod assembly transmission, drive portion can control the extension or contraction of connecting rod assembly, thereby control the lifting movement of step mechanism, step mechanism includes step and telescopic fixed link installed in both ends of step, telescopic fixed link is located between step and connecting rod assembly, and the top end of telescopic fixed link is active and penetrates in mounting seat, telescopic fixed link can with step mechanism synchronous extension or contraction, thereby locking the position of step, the utility model discloses a telescopic multistage step device, its design is reasonable, and the structure is ingenious, not only can facilitate driver to get on and off the vehicle, but also can improve the passability of vehicle, is helpful to the development of commercial vehicle.

Description

Technical Field

[0001] This invention relates to the field of commercial vehicle step technology, and more particularly to a telescopic multi-stage step device. Background Technology

[0002] With the continuous development of commercial vehicle technology, the application fields of commercial vehicles are becoming increasingly widespread. As the market constantly demands new adaptability from commercial vehicles, some commercial vehicles are designed with increasingly higher chassis heights to increase their passability, thus increasing the height of the cab. To facilitate driver entry and exit, the number of steps needs to be increased to three or four. However, existing steps are too low to the ground, resulting in insufficient vehicle passability and failing to meet the needs of high-chassis commercial vehicles, which is detrimental to the development of commercial vehicles. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies where the steps are too low off the ground, and to provide a telescopic multi-stage step device with a reasonable design and ingenious structure. It not only facilitates drivers getting on and off the vehicle, but also improves the vehicle's passability, thus contributing to the development of commercial vehicles.

[0004] This invention is achieved through the following technical solution: a telescopic multi-stage step device, including a mounting base disposed below the cab, with connecting rod assemblies at both ends of the mounting base, and a step mechanism connected to the mounting base via the connecting rod assemblies; a drive unit is disposed on the mounting base, and the drive unit is pulsatorically connected to the connecting rod assemblies; the drive unit can control the extension or retraction of the connecting rod assemblies, thereby controlling the lifting and lowering movement of the step mechanism; the step mechanism includes a step and telescopic fixing rods mounted at both ends of the step, the telescopic fixing rods being located between the step and the connecting rod assemblies, and the top end of the telescopic fixing rods movably passing through the mounting base; the telescopic fixing rods can extend or retract synchronously with the step mechanism, thereby locking the position of the step.

[0005] A further improvement of the present invention is that the mounting base includes a base plate, a mounting plate integrally connected to the rear side of the base plate, and side plates integrally connected to both ends of the base plate; the mounting base is fixed to the underside of the cab by the mounting plate, and the mounting base is movably connected to the linkage assembly by the side plates.

[0006] A further improvement of the present invention is that the driving part is a servo motor, which is fixed on the base plate. The servo motor is connected to a drive shaft through a worm and a worm wheel. Both ends of the drive shaft are rotatably connected to the side plate, and one end of the drive shaft passes through the side plate and is connected to a drive rod. The drive rod is connected to the linkage assembly, and the drive rod can drive the linkage assembly to move.

[0007] A further improvement of the present invention is that the linkage assembly has a three-section structure, with the step and telescopic fixing rod matching the linkage assembly.

[0008] A further improvement of the present invention includes that the linkage assembly comprises upper linkage A and upper linkage B, middle linkage A and middle linkage B, and lower linkage A and lower linkage B; the step comprises an upper step, a middle step, and a lower step; upper linkage A and upper linkage B are rotatably connected by an upper fixing pin, and upper linkage A and upper linkage B are connected to one end of the upper step by an upper fixing pin; middle linkage A and middle linkage B are rotatably connected by a middle fixing pin, and middle linkage A and middle linkage B are connected to one end of the middle step by a middle fixing pin; lower linkage A and lower linkage B are connected by a lower fixing pin. The lower connecting rods A and B are rotatably connected by a fixed pin, and the lower connecting rods A and B are connected to one end of the lower step via a lower fixed pin; the top ends of the upper connecting rods A and B are rotatably connected to the side plates, and the top of the upper connecting rod B is rotatably connected to one end of the drive rod; the bottom ends of the upper connecting rods A and B are rotatably connected to the top ends of the middle connecting rods B and A via connecting pins; the bottom ends of the middle connecting rods A and B are rotatably connected to the top ends of the lower connecting rods B and A via connecting pins; the bottom end of the lower connecting rod A and the bottom end of the lower connecting rod B are rotatably connected by a lower fixed pin.

[0009] A further improvement of the present invention is that a sliding groove A corresponding to the upper connecting rod A and a sliding groove B corresponding to the upper connecting rod B are provided on the side plate; the top end of the upper connecting rod A is slidably connected to the sliding groove A by a sliding pin, and the top end of the upper connecting rod B is slidably connected to the sliding groove B by a sliding pin.

[0010] A further improvement of the present invention is that slide groove A and slide groove B are elongated grooves respectively arranged on both sides of the drive shaft, and the length of slide groove A is greater than the length of slide groove B.

[0011] A further improvement of the present invention is that the telescopic fixing rod is a three-section telescopic rod, with mounting grooves corresponding to the telescopic fixing rod respectively opened on the end faces of the upper step, middle step and lower step; the telescopic fixing rod is movably disposed in the mounting groove, and the bottom end of the telescopic fixing rod is movably connected to the lower step through a telescopic rod fixing pin.

[0012] A further improvement of the present invention is that two telescopic fixing rods are provided, which are located on both sides of the drive shaft; the base plate is provided with telescopic rod grooves A and B corresponding to the two telescopic fixing rods respectively, and the two telescopic fixing rods are movably inserted through the base plate through the telescopic rod grooves A and B respectively.

[0013] A further improvement of the present invention is that the front end of the side plate is integrally connected with a fixing lug for limiting the telescopic fixing rod.

[0014] As can be seen from the above technical solutions, the beneficial effects of the present invention are: the design of this step device is reasonable and the overall structure is ingenious, which not only facilitates the driver to get on and off the vehicle, but also improves the vehicle's passability and contributes to the development of commercial vehicles. Attached Figure Description

[0015] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a structural schematic diagram of a specific embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram of the mounting base according to a specific embodiment of the present invention.

[0018] Figure 3 This is a schematic diagram of the connection structure between the mounting base, step mechanism and connecting rod assembly in a specific embodiment of the present invention.

[0019] Figure 4 This is a schematic diagram of the connection structure between the step and the telescopic fixing rod in a specific embodiment of the present invention.

[0020] Figure 5 This is a schematic diagram of the connection structure between the telescopic fixing rod and the telescopic rod groove A and telescopic rod groove B in a specific embodiment of the present invention.

[0021] 1. Mounting base; 101. Mounting plate; 102. Side plate; 1021. Slide groove A; 1022. Slide groove B; 103. Fixing lug; 104. Base plate; 1041. Telescopic rod groove A; 1042. Telescopic rod groove B; 2. Step; 201. Upper step; 202. Middle step; 203. Lower step; 3. Linkage assembly; 301. Upper link A; 302. Drive rod; 303. Upper link B; 304. Middle link A; 305. Middle link B; 306. Lower link A; 307. Lower link B; 4. Telescopic fixing rod; 401. Upper telescopic rod; 402. Middle telescopic rod; 403. Lower telescopic rod; 5. Drive unit; 501. Worm gear; 6. Drive shaft; 601. Worm wheel; 7. Sliding pin; 8. Upper fixing pin; 9. Connecting pin; 10. Telescopic rod fixing pin. Detailed Implementation

[0022] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0023] Please refer to the attached document. Figure 1 — Figure 4The following is a description of a telescopic multi-stage step device according to a specific embodiment: The telescopic multi-stage step device of the present invention includes a mounting base 1, which includes a base plate 104. A mounting plate 101 is integrally connected to the rear side of the base plate 104, and side plates 102 are integrally connected to both ends of the base plate 104. The mounting base 1 is fixed to the lower part of the cab via the mounting plate 101. The two side plates 102 are movably connected to a linkage assembly 3, which is connected to a step mechanism. A drive unit 5 is provided on the mounting base 1. The drive unit 5 is a servo motor. The servo motor is fixed to the base plate 104 and is connected to a drive shaft 6 via a worm gear 501 and a worm wheel 601. Both ends of the drive shaft 6 are rotatably connected to the side plate 102, and one end of the drive shaft 6 passes through the side plate 102 and is connected to the drive rod 302; the drive rod 302 is connected to the linkage assembly 3, and the drive rod 302 can drive the linkage assembly 3 to move; the drive part 5 can control the extension or retraction of the linkage assembly 3, thereby controlling the lifting and lowering movement of the pedal mechanism; the stepping mechanism includes a step 2 and telescopic fixing rods 4 installed at both ends of the step 2. The telescopic fixing rods 4 are located between the step 2 and the linkage assembly 3, and the top end of the telescopic fixing rods 4 can move through the mounting base 1; the telescopic fixing rods 4 can extend or retract synchronously with the stepping mechanism, thereby locking the position of the step 2.

[0024] Specifically, the linkage assembly 3 has a three-section structure, with the step 2 and the telescopic fixing rod 4 matching the linkage assembly 3.

[0025] Linkage assembly 3 includes upper link A301 and upper link B303, middle link A304 and middle link B305, and lower link A306 and lower link B307; step 2 includes upper step 201, middle step 202, and lower step 203; upper link A301 and upper link B303 are rotatably connected by upper fixing pin 8, and upper link A301 and upper link B303 are connected to one end of upper step 201 by upper fixing pin 8; middle link A304 and middle link B305 are rotatably connected by middle fixing pin, and middle link A304 and middle link B305 are connected to one end of middle step 202 by middle fixing pin; lower link A306 and lower link B307 are connected by lower fixing pin. The lower connecting rods A306 and B307 are connected to one end of the lower step 203 via a fixed pin. The top ends of the upper connecting rods A301 and B303 are rotatably connected to the side plate 102, and the top of the upper connecting rod B303 is rotatably connected to one end of the drive rod 302. The bottom ends of the upper connecting rods A301 and B303 are rotatably connected to the top ends of the middle connecting rods B305 and A304 via connecting pins 9. The bottom ends of the middle connecting rods A304 and B305 are rotatably connected to the top ends of the lower connecting rods B307 and A306 via connecting pins 9. The bottom end of the lower connecting rod A306 is rotatably connected to the bottom end of the lower connecting rod B307 via a fixed pin.

[0026] The side plate 102 has a sliding groove A1021 corresponding to the upper connecting rod A301 and a sliding groove B1022 corresponding to the upper connecting rod B303; the top end of the upper connecting rod A301 is slidably connected to the sliding groove A1021 through a sliding pin 7, and the top end of the upper connecting rod B303 is slidably connected to the sliding groove B1022 through a sliding pin 7.

[0027] The telescopic fixing rod 4 is a three-section telescopic rod, mainly composed of an upper telescopic rod 401, a middle telescopic rod 402, and a lower telescopic rod 403. The specific structure can be referred to in the existing multi-stage telescopic rod. The end faces of the upper step 201, the middle step 202, and the lower step 203 are respectively provided with mounting grooves corresponding to the telescopic fixing rod 4. The telescopic fixing rod 4 is movably installed in the mounting groove, and the bottom end of the telescopic fixing rod 4 is movably connected to the lower step 203 through the telescopic rod fixing pin 10.

[0028] The operating principle of this invention is as follows: When the vehicle is parked, the servo motor receives a door opening signal and rotates clockwise. This rotation, via the worm gear 501 and worm wheel 601, drives the drive shaft 6 to rotate, which in turn drives the drive rod 302 to rotate. Since the drive rod 302 is connected to the upper connecting rod B303 of the linkage assembly 3, the upper connecting rod B303 can pull the sliding pin 7 inwards, thereby extending the linkage assembly 3, which in turn lowers the step 2, thus extending the step mechanism. In this state, the driver can easily get in or out of the vehicle.

[0029] When the vehicle needs to move, the servo motor receives the door closing signal and rotates counterclockwise. This rotation, via the worm gear 501 and worm wheel 601, drives the drive shaft 6 to rotate, which in turn drives the drive rod 302. Since the drive rod 302 is connected to the upper connecting rod B303 of the linkage assembly 3, the upper connecting rod B303 can pull the sliding pin 7 outwards, thus achieving the retraction of the linkage assembly 3, which in turn achieves the upward movement of the step 2, effectively retracting the step mechanism. In this state, the vehicle's passability is effectively improved.

[0030] Meanwhile, thanks to the structure of the worm gear 501 and worm wheel 601, the drive rod 302 also serves as a locking mechanism to assist in the lifting and lowering process of the entire device. For further ease of use, this device can be equipped with a remote control. The remote control, through the vehicle body controller and communication module, can control the operation of the servo motor; the specific structure can be referenced from existing electrical remote control technology. In special circumstances, when the door is open, the servo motor can be controlled via a rocker switch or remote control to retract the step mechanism; when the door is closed, the step mechanism can also be extended via a rocker switch or remote control.

[0031] In one embodiment, slide groove A1021 and slide groove B1022 are elongated grooves correspondingly disposed on both sides of the drive shaft 6, and the length of slide groove A1021 is greater than the length of slide groove B1022. The structure of the above-mentioned slide grooves A1021 and B1022 can better realize the extension or retraction of the connecting rod assembly 3.

[0032] In one embodiment, two telescopic fixing rods 4 are provided, located on both sides of the drive shaft 6; the base plate 104 has telescopic rod grooves A1041 and B1042 corresponding to the two telescopic fixing rods 4 respectively, and the two telescopic fixing rods 4 movably pass through the base plate 104 via the telescopic rod grooves A1041 and B1042 respectively. The arrangement of the two telescopic fixing rods 4 is more reasonable, ensuring the stable operation of the stepping mechanism.

[0033] In one embodiment, the front end of the side plate 102 is integrally connected to a fixing lug 103 for limiting the position of the telescopic fixing rod 4. The fixing lug 103 can further limit the position of the telescopic fixing rod 4 and prevent it from moving in other directions.

[0034] The terms "upper," "lower," "outer," "inner," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish relative positional relationships and are not necessarily qualitative. It should be understood that such data can be interchanged where appropriate so that embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0035] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those 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 invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A telescopic multi-stage step device, comprising a mounting base (1), characterized in that, The mounting base (1) is located below the cab. Linkage assemblies (3) are provided at both ends of the mounting base (1), and the mounting base (1) is connected to a step mechanism via the linkage assemblies (3). A drive unit (5) is provided on the mounting base (1), and the drive unit (5) is connected to the linkage assembly (3) via a transmission connection. The drive unit (5) can control the extension or retraction of the linkage assembly (3), thereby controlling the lifting and lowering movement of the pedal mechanism. The step mechanism includes a step (2) and telescopic fixing rods (4) installed at both ends of the step (2). The telescopic fixing rods (4) are located between the step (2) and the linkage assembly (3), and the top end of the telescopic fixing rods (4) extends through the mounting base (1). The telescopic fixing rods (4) can extend or retract synchronously with the step mechanism. This locks the position of the step (2); the linkage assembly (3) is a three-section structure, with the step (2) and telescopic fixing rod (4) matching the linkage assembly (3); the linkage assembly (3) includes upper linkage A (301) and upper linkage B (303), middle linkage A (304) and middle linkage B (305), and lower linkage A (306) and lower linkage B (307); the step (2) includes upper step (201), middle step (202) and lower step (203); upper linkage A (301) and upper linkage B (303) are cross-rotatedly connected by upper fixing pin (8), and upper linkage A (301) and upper linkage B (303) are connected to one end of upper step (201) by upper fixing pin (8); middle linkage A (301) and lower linkage B (303) are cross-rotatedly connected by upper fixing pin (8); middle linkage A (301) and lower ... 4) The middle connecting rod B (305) is rotatably connected by a middle fixing pin, and the middle connecting rod A (304) and the middle connecting rod B (305) are connected to one end of the middle step (202) by the middle fixing pin; the lower connecting rod A (306) and the lower connecting rod B (307) are rotatably connected by the lower fixing pin, and the lower connecting rod A (306) and the lower connecting rod B (307) are connected to one end of the lower step (203) by the lower fixing pin; the top ends of the upper connecting rod A (301) and the upper connecting rod B (303) are rotatably connected to the side plate (102) respectively, and the top of the upper connecting rod B (303) is rotatably connected to one end of the drive rod (302); the bottom ends of the upper connecting rod A (301) and the upper connecting rod B (303) are connected to the middle connecting rod by the connecting pin (9) respectively. The top ends of B (305) and the middle connecting rod A (304) are rotatably connected; the bottom ends of the middle connecting rod A (304) and the middle connecting rod B (305) are rotatably connected to the top ends of the lower connecting rod B (307) and the lower connecting rod A (306) respectively through connecting pins (9); the bottom end of the lower connecting rod A (306) and the bottom end of the lower connecting rod B (307) are rotatably connected through the lower fixing pin; the telescopic fixing rod (4) is a three-section telescopic rod, and the end faces of the upper step (201), the middle step (202) and the lower step (203) are respectively provided with mounting grooves corresponding to the telescopic fixing rod (4); the telescopic fixing rod (4) is movably set in the mounting groove, and the bottom end of the telescopic fixing rod (4) is movably connected to the lower step (203) through the telescopic rod fixing pin (10);Two telescopic fixing rods (4) are provided, located on both sides of the drive shaft (6); the base plate (104) has telescopic rod grooves A (1041) and B (1042) corresponding to the two telescopic fixing rods (4), respectively, and the two telescopic fixing rods (4) move through the base plate (104) through the telescopic rod grooves A (1041) and B (1042) respectively.

2. The telescopic multi-stage step device according to claim 1, characterized in that, The mounting base (1) includes a base plate (104), a mounting plate (101) is integrally connected to the rear side of the base plate (104), and side plates (102) are integrally connected to both ends of the base plate (104); the mounting base (1) is fixed to the bottom of the cab through the mounting plate (101), and the mounting base (1) is movably connected to the linkage assembly (3) through the side plates (102).

3. The telescopic multi-stage step device according to claim 1, characterized in that, The drive unit (5) is a servo motor, which is fixed on the base plate (104). The servo motor is connected to the drive shaft (6) through the worm (501) and worm wheel (601). The two ends of the drive shaft (6) are rotatably connected to the side plate (102), and one end of the drive shaft (6) passes through the side plate (102) and is connected to the drive rod (302). The drive rod (302) is connected to the linkage assembly (3), and the drive rod (302) can drive the linkage assembly (3) to move.

4. The telescopic multi-stage step device according to claim 1, characterized in that, Side panel (102) The upper part has a groove A (1021) corresponding to the upper connecting rod A (301) and a groove B (1022) corresponding to the upper connecting rod B (303); the top end of the upper connecting rod A (301) is slidably connected to the groove A (1021) through a sliding pin (7), and the top end of the upper connecting rod B (303) is slidably connected to the groove B (1022) through a sliding pin (7).

5. A telescopic multi-stage step device according to claim 4, characterized in that, Slide A (1021) and slide B (1022) are elongated grooves respectively set on both sides of the drive shaft (6), and the length of slide A (1021) is greater than the length of slide B (1022).

6. A telescopic multi-stage step device according to claim 1, characterized in that, The front end of the side plate (102) is integrally connected with a fixing lug (103) for limiting the telescopic fixing rod (4).

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