Wheel retracting and extending structure and vehicle lifting machine

Abstract

The present invention belongs to the technical field of locomotive maintenance equipment, and discloses a wheel retracting and extending structure and a vehicle lifting machine. The wheel retracting and extending structure includes a support rod connected to the vehicle body, a first movable rod and a second movable rod rotatably connected to both ends of the support rod, and a third movable rod connecting the first movable rod and the second movable rod. The support rod, the first movable rod, the second movable rod and the third movable rod form a planar four-bar linkage. When the second movable rod and the third movable rod are collinear, the planar four-bar linkage is in a dead point position, and the running wheel on the first movable rod is grounded, so that the running wheel can walk on the ground, thereby driving the vehicle to move. Since the four-bar linkage is in a dead point position, the mechanism is self-locking, which can provide stable support for the wheel and ensure the stability of the wheel when driving. At the same time, by utilizing the self-locking characteristics of the four-bar linkage, the overall structure is simple, and there is no need to add an additional drive device, which is conducive to saving resources.

Description

Technical Field

[0001] The present invention relates to the technical field of locomotive maintenance equipment, and in particular to a wheel retracting and extending structure and a locomotive lifting machine. Background Art

[0002] During rail vehicle maintenance, the entire train must be lifted to a certain height to facilitate replacement of the bogies and other components at the bottom of the vehicle. A car hoist is a specialized piece of equipment used to lift the vehicle bodies during vehicle maintenance in each railway locomotive depot. Because there are many types of vehicles awaiting maintenance within the maintenance depot, and the locations of the vehicle hoisting points for each vehicle type vary, to meet the requirements of vehicle hoisting operations for different vehicle types, car hoists are generally equipped with a running mechanism to move the main body of the car hoist and meet the alignment requirements of the driving points for each vehicle type. Once the car hoist reaches the designated location, due to the heavy weight of the vehicle to be repaired, the running mechanism of the car hoist is insufficient to support the vehicle to keep it stable. Therefore, the wheels of the car hoist must be retracted using a wheel retraction mechanism, allowing the base of the car hoist to contact the ground and thus ensure the stability of the driving operation.

[0003] There are two main types of existing wheel retraction and extension structures. One utilizes a drive device (such as a motor or a cylinder) that, through a transmission assembly, drives the wheel frame of the vehicle to swing. The wheel frame drives the wheel to rise or fall, thereby driving the vehicle chassis to rise or fall. However, the provision of a drive device and transmission assembly not only complicates the structure of the vehicle but also increases system cost, resulting in additional resource waste. In the other wheel retraction and extension structure, when the vehicle is unloaded, the wheels are grounded by the support of an elastic element, allowing the vehicle to travel on the ground. When the vehicle is lifting a load (i.e., a vehicle to be repaired), the elastic element is compressed under the weight of the load, driving the wheel frame to swing and retract, causing the wheel to fall to the ground. In this method, the elastic element (such as a spring) is directly used as the support member for the vehicle wheel. The insufficient support stiffness of the elastic element directly causes the vehicle to be affected by the ground and the driving inertia when traveling on the ground, resulting in poor driving stability and greatly limiting the maneuverability and safety of the vehicle during travel. Summary of the Invention

[0004] One object of the present invention is to provide a wheel retracting and extending structure which has a simple structure, reduces waste of resources, and can provide stable support for the wheels when they are lowered, thereby ensuring the stability of the vehicle during driving.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A wheel retracting and extending structure includes a connecting rod assembly and a running wheel;

[0007] The connecting rod assembly comprises:

[0008] a support rod configured to be connected to a vehicle body;

[0009] a first movable rod, one end of which is rotatably mounted on the bottom of the support rod, and the first movable rod is connected to the walking wheel;

[0010] a second movable rod, one end of which is rotatably mounted on the upper portion of the support rod;

[0011] a third movable rod, wherein two ends of the third movable rod are rotatably connected to the other end of the second movable rod and the other end of the first movable rod respectively;

[0012] When the second movable rod and the third movable rod are collinear, the connecting rod assembly is at a dead point position and the running wheel is grounded;

[0013] When the second movable rod and the third movable rod are not collinear, the connecting rod assembly is in an active position and the running wheels are off the ground.

[0014] Optionally, a stop portion is provided on the support rod or the vehicle body, and when the second movable rod and the third movable rod are collinear, the stop portion abuts against the first movable rod, and the stop portion is used to prevent the first movable rod from continuing to rotate downward.

[0015] Optionally, a driving assembly is further included for driving the connecting rod assembly to switch between the active position and the dead point position.

[0016] Optionally, the fixed end of the driving assembly is connected to the support rod or the vehicle body, and the output end of the driving assembly is connected to the first movable rod, the second movable rod or the third movable rod.

[0017] Optionally, an elastic member is further included for driving the connecting rod assembly to return from the active position to the dead point position.

[0018] Optionally, one end of the elastic member is connected to the support rod or the vehicle body, and the other end is connected to the first movable rod, the second movable rod or the third movable rod.

[0019] Optionally, the elastic member includes a spring.

[0020] Optionally, a rotating connecting piece is further included, and the support rod and the first movable rod, the support rod and the second movable rod, the first movable rod and the third movable rod, and the second movable rod and the third movable rod are all connected by the rotating connecting piece.

[0021] Optionally, the support rod and the vehicle body are an integral structure formed by casting.

[0022] Another object of the present invention is to provide a vehicle lifting machine that has stable travel, high maneuverability and safety.

[0023] To achieve this object, the present invention adopts the following technical solutions:

[0024] A vehicle lifting machine comprises the above-mentioned wheel retracting and extending structure.

[0025] Beneficial effects of the present invention:

[0026] The wheel retracting and extending structure provided by the present invention comprises a support rod, a first movable rod, a second movable rod, and a third movable rod, forming a planar four-bar linkage, wherein the support rod is connected to the vehicle body to increase the support strength and support stability of the linkage assembly. One end of the first movable rod is rotatably mounted on the bottom of the support rod, and the first movable rod is connected to a running wheel. By rotating the first movable rod around the bottom of the support rod, the running wheel can be driven to rise or fall. One end of the second movable rod is rotatably mounted on the upper portion of the support rod, and the two ends of the third movable rod are respectively rotatably connected to the other end of the second movable rod and the other end of the first movable rod. In other words, the planar four-bar linkage is connected to the vehicle body via the support rod. When the second movable rod and the third movable rod are collinear, the planar four-bar linkage is in a dead point position, and the running wheel on the first movable rod falls to the ground, allowing the running wheel to run on the ground, thereby driving the vehicle to move. Since the four-bar linkage is in a dead point position, the mechanism is self-locking, which can provide stable support for the wheel and ensure the stability of the vehicle during driving. When the second and third movable links are not collinear, the linkage mechanism is in the active position, causing the running wheels to retract upward and away from the ground, causing the chassis to touch the ground and immobilize the vehicle. Furthermore, because this wheel retraction mechanism utilizes the self-locking properties of a planar four-bar linkage, the overall structure is simple, eliminating the need for additional drive devices and conserving resources.

[0027] The vehicle lifting machine provided by the present invention utilizes the self-locking characteristic of the dead point position of the above-mentioned planar four-bar linkage mechanism to provide stable support for the running wheel, thereby making the vehicle driving stable and having high maneuverability and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in describing the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without any creative work.

[0029] Figure 1 1 is a schematic structural diagram of a wheel retracting and extending structure (in a grounded state of the traveling wheel) provided in an embodiment of the present invention;

[0030] Figure 2 It is a structural schematic diagram of a wheel retracting and extending structure (in the state where the running wheels are off the ground) provided by an embodiment of the present invention.

[0031] In the picture:

[0032] 100. Vehicle body;

[0033] 1. Connecting rod assembly; 11. Support rod; 111. Stopper; 12. First movable rod; 13. Second movable rod; 14. Third movable rod;

[0034] 2. Travel wheels;

[0035] 3. Elastic parts. DETAILED DESCRIPTION

[0036] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0039] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not require further definition or explanation in subsequent drawings.

[0040] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0041] In the description of the present invention, it should be noted that, unless otherwise specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0042] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0043] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0044] The car lifting machine is a special equipment used to lift the vehicle body during the inspection of locomotives in each railway locomotive depot. When driving, it is necessary to lift the wheels through the wheel retraction device to ground the chassis, thereby increasing the stability of the car lifting operation. After the car lifting operation is completed, the wheels of the car lifting machine need to be lowered to the ground so that the staff can move the car lifting machine to the next working position. This embodiment provides a wheel retraction structure that can provide stable support for the wheels when they are lowered, ensuring the stability of the vehicle during driving, and has a simple structure, does not require the addition of additional drive devices, and saves resources. Specifically, if Figure 1 As shown, the wheel retracting and extending structure includes a connecting rod assembly 1 and a running wheel 2.

[0045] Among them, the connecting rod assembly 1 includes a support rod 11, a first movable rod 12, a second movable rod 13 and a third movable rod 14. The support rod 11 is configured to be connected to the vehicle body 100, thereby increasing the support strength and support stability of the connecting rod assembly 1. One end of the first movable rod 12 is rotatably mounted on the bottom of the support rod 11, and the first movable rod 12 is connected to the running wheel 2. By rotating the first movable rod 12, the running wheel 2 can be driven to lift or fall. One end of the second movable rod 13 is rotatably mounted on the upper part of the support rod 11, and the two ends of the third movable rod 14 are respectively rotatably connected to the other end of the second movable rod 13 and the other end of the first movable rod 12. In other words, the support rod 11, the first movable rod 12, the second movable rod 13 and the third movable rod 14 form a planar four-bar linkage. When the second movable rod 13 and the third movable rod 14 are collinear (see Figure 1 ), the planar four-bar linkage is at the dead point, and the running wheel 2 on the first movable rod 12 falls to the ground, so that the running wheel 2 can run on the ground, thereby driving the vehicle to move. Since the four-bar linkage is at the dead point, the mechanism is self-locking, which can provide stable support for the running wheel 2 and ensure the stability of the vehicle during driving. When the second movable rod 13 and the third movable rod 14 are not collinear (see Figure 2 ), the linkage is in the active position, the running wheels 2 are retracted upward and away from the ground, the chassis of the vehicle touches the ground, and the vehicle cannot move. Furthermore, because this wheel retraction mechanism utilizes the self-locking characteristics of the planar four-bar linkage, the overall structure is simple, eliminating the need for additional drive devices and contributing to resource conservation.

[0046] Alternatively, as Figure 1 and Figure 2 As shown, in this embodiment, the support rod 11 and the vehicle body 100 are cast as an integral structure. In other words, the support rod 11 is part of the vehicle body 100, and the first movable rod 12 and the second movable rod 13 are both rotatably connected to the vehicle body 100, thereby further improving the connection strength and support stability of the planar four-bar linkage.

[0047] In other embodiments, the support rod 11 may also be connected to the vehicle body 100 as a whole by welding or bonding, etc., and can also provide stable support for the connecting rod assembly 1.

[0048] In another embodiment, the support rod 11 can be detachably connected to the vehicle body 100, such as by bolting or clamping. This not only allows the connection between the connecting rod assembly 1 and the vehicle body 100 to be achieved, but also facilitates the adjustment of the relative position of the wheel retractable structure and the vehicle body 100 by the operator to accommodate the installation requirements of vehicle lifting machines of different structures, thereby increasing the flexibility of the wheel retractable structure and expanding its scope of use.

[0049] Alternatively, as Figure 1 and Figure 2 As shown, a stopper 111 is provided on the support rod 11 or the vehicle body 100. In the present embodiment, the stopper 111 is provided at the bottom of the vehicle body 100. During the swinging process of the connecting rod assembly 1, when the first movable rod 12 swings downward to abut against the stopper 111, the running wheel 2 reaches the extreme position extending out from the bottom of the vehicle body 100. At this time, the running wheel 2 is grounded, and the second movable rod 13 and the third movable rod 14 are close to a collinear position in the rod length direction, and the connecting rod mechanism has a self-locking characteristic. When the running wheel 2 drives the vehicle to travel on the ground and is impacted by an uneven road surface, due to the self-locking of the connecting rod mechanism, the second movable rod 13 and the third movable rod 14 can maintain a state close to collinearity and be unaffected by the impact force, thereby providing stable support for the running wheel 2 and ensuring the stability and safety of the vehicle during driving. At the same time, the stop portion 111 is used to prevent the first movable rod 12 from continuing to rotate downward, which can prevent the first movable rod 12 from rotating excessively, driving the second movable rod 13 and the third movable rod 14 to rotate synchronously, so that the second movable rod 13 and the third movable rod 14 are away from the collinear position, resulting in the planar four-bar linkage being unable to self-lock, and thus unable to provide support for the walking of the walking wheel 2.

[0050] Optionally, the wheel retractable structure further includes a drive assembly. The drive assembly is capable of driving the connecting rod assembly 1 between the active position and the dead center position. For example, the drive assembly can be a motor, a pneumatic cylinder, or an oil cylinder, etc., which provides high driving force and is easy to control, thereby improving the flexibility of switching between raising and lowering the running wheel 2.

[0051] Optionally, the fixed end of the drive assembly is connected to the support rod 11 or the vehicle body 100, and the output end of the drive assembly is connected to the first movable rod 12, the second movable rod 13 or the third movable rod 14. The output end of the drive assembly can drive the first movable rod 12, the second movable rod 13 and the third movable rod 14 to rotate so that the second movable rod 13 and the third movable rod 14 are collinear. For example, in this embodiment, the fixed end of the drive assembly is rotationally connected to the vehicle body 100, and the output end of the drive assembly is connected to the connection node of the second movable rod 13 and the third movable rod 14. The drive assembly can switch the wheel retraction state independently of the change in the load of the driving machine, and can meet more application scenarios with vehicle travel and parking operation requirements, thereby improving the flexibility of vehicle use.

[0052] Alternatively, as Figure 1 As shown, the wheel retractable structure also includes an elastic member 3. This member is used to drive the connecting rod assembly 1 from its active position back to its dead center position. The elastic force generated by the elastic member 3 after elastic deformation drives the connecting rod to rotate, returning the connecting rod assembly 1 to its dead center position. This allows the connecting rod mechanism to self-lock without the need for additional drive devices, thus reducing resource consumption.

[0053] Alternatively, as Figure 1 and Figure 2 As shown, one end of the elastic member 3 is connected to the support rod 11 or the vehicle body 100, and the other end is connected to the first movable rod 12, the second movable rod 13, or the third movable rod 14. In this embodiment, one end of the elastic member 3 is pivotally connected to the vehicle body 100, and the other end is connected to the connection point between the second movable rod 13 and the third movable rod 14. When the vehicle body 100 is unloaded, the elastic member 3 pulls on the connection point between the second movable rod 13 and the third movable rod 14, causing the first movable rod 12 to rotate downward. When the first movable rod 12 abuts the stop 111, the second and third movable rods 13 and 14 are nearly collinear, and the linkage mechanism is at a dead point, self-locking. When the vehicle body 100 is loaded, the weight of the load overcomes the locking force of the elastic member 3 on the mechanism, driving the wheel retraction mechanism in the reverse direction. At this time, the first movable rod 12 swings upward, lifting the running wheel 2, thereby lowering the base of the vehicle body 100 to the ground.

[0054] Alternatively, as Figure 1 and Figure 2 As shown, in this embodiment, the elastic member 3 comprises a spring. The spring is easily deformable, highly elastic, and is easy to obtain and has low cost.

[0055] Optionally, the wheel retractable structure further includes a rotating connector. The supporting rod 11 and the first movable rod 12, the supporting rod 11 and the second movable rod 13, the first movable rod 12 and the third movable rod 14, and the second movable rod 13 and the third movable rod 14 are all connected via a rotating connector. For example, the rotating connector can be a pin, which provides reliable operation and easy disassembly.

[0056] This embodiment also provides a vehicle-lifting machine, including the above-mentioned wheel retracting and extending structure, which utilizes the self-locking characteristics of the dead point position of the planar four-bar linkage to provide stable support for the walking wheel 2 during driving, thereby making the driving machine run smoothly, and the maneuverability and safety of the driving machine are high during driving.

[0057] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A wheel retracting and extending structure, characterized in that: It includes a connecting rod assembly (1) and a running wheel (2); The connecting rod assembly (1) comprises: A support rod (11) configured to be connected to the vehicle body (100); a first movable rod (12), one end of the first movable rod (12) being rotatably mounted on the bottom of the support rod (11), and the first movable rod (12) being connected to the walking wheel (2); a second movable rod (13), one end of the second movable rod (13) being rotatably mounted on the upper portion of the support rod (11); a third movable rod (14), wherein both ends of the third movable rod (14) are rotatably connected to the other end of the second movable rod (13) and the other end of the first movable rod (12); When the second movable rod (13) and the third movable rod (14) are collinear, the connecting rod assembly (1) is in a dead point position, and the running wheel (2) is grounded; When the second movable rod (13) and the third movable rod (14) are not collinear, the connecting rod assembly (1) is in an active position and the running wheel (2) is off the ground; A stopper (111) is provided on the support rod (11) or the vehicle body (100); when the second movable rod (13) and the third movable rod (14) are collinear, the stopper (111) abuts against the first movable rod (12); the stopper (111) is used to prevent the first movable rod (12) from continuing to rotate downward; It also includes a driving assembly for driving the connecting rod assembly (1) to switch between the active position and the dead point position; The fixed end of the drive assembly is connected to the support rod (11) or the vehicle body (100), and the output end of the drive assembly is connected to the first movable rod (12), the second movable rod (13) or the third movable rod (14).

2. The wheel retracting and extending structure according to claim 1, characterized in that: It also includes an elastic member (3) for driving the connecting rod assembly (1) to return from the active position to the dead point position.

3. The wheel retracting and extending structure according to claim 2, characterized in that: One end of the elastic member (3) is connected to the support rod (11) or the vehicle body (100), and the other end is connected to the first movable rod (12), the second movable rod (13) or the third movable rod (14).

4. The wheel retracting and extending structure according to claim 2, characterized in that: The elastic member (3) comprises a spring.

5. The wheel retracting and extending structure according to claim 1, characterized in that: It also includes a rotating connecting member, through which the support rod (11) and the first movable rod (12), the support rod (11) and the second movable rod (13), the first movable rod (12) and the third movable rod (14), and the second movable rod (13) and the third movable rod (14) are all connected.

6. The wheel retracting and extending structure according to claim 1, characterized in that: The support rod (11) and the vehicle body (100) are an integral structure formed by casting.

7. A vehicle lifting machine, characterized in that: The invention comprises a wheel retracting and extending structure as claimed in any one of claims 1 to 6.

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