Quick release handcart axle

Abstract

The utility model provides a quick detachable handcart axle, including wheel axle, the both ends end surface of wheel axle is provided with internal thread hole respectively, its both ends still respectively have the wheel of bearing embedding and clamping, the stud that sets up in the outer screw head cylinder is connected with internal thread hole, the inner bushing is installed on the outer screw head cylinder, and is in close contact with the outer surface of wheel axle, spring washer is placed on wheel axle, and is located between outer screw head cylinder and wheel, the utility model discloses the thread is set as wheel axle end surface internal thread hole anticorrosion and knock, and the outer screw head cylinder is hollow hex structure, and is equipped with integral stud, and ordinary spanner can quick detachable anti -loss, inner bushing seal, spring washer pre -tightening, and the wheel of preventing loosening is safe.

Description

Technical Field

[0001] This utility model belongs to the field of handcart axle technology, and in particular relates to a quick-release handcart axle. Background Technology

[0002] Handcarts are widely used lightweight transportation tools in logistics warehousing, retail, and household moving. The rationality of their axle structure directly affects ease of use, maintenance costs, and service life. Currently, the installation and fixing of handcart wheels and axles mainly rely on two traditional methods: One method is the use of external threaded bolts for fixing: the outer surfaces of both ends of the wheel axle are machined with external threads. After the wheel with the embedded bearing is fitted onto the axle, it is fixed by tightening the nuts and washers with the external threads. Although this method has a certain degree of ease of assembly and disassembly, it has obvious drawbacks: because the external threads are directly exposed at the ends of the axle and close to the ground, in humid environments (such as rainy weather handling, warehouse water accumulation) or dusty environments (such as building material transportation, construction site operations), water stains, mud, and dust easily adhere to the thread surface. After long-term use, it is very easy to rust and scale, causing the nut to seize up with the thread. Subsequent maintenance requires the use of tools to forcibly disassemble it, which is not only time-consuming and laborious, but also easily causes thread wear or even damage to the axle. At the same time, during the assembly process, the inner ring of the bearing embedded in the wheel is prone to direct collision with the exposed external threads, causing thread deformation and stripping, reducing the reliability of the connection.

[0003] Another method is pin fixing: the wheel is fixed by a pin passing laterally through the positioning hole between the wheel axle and the frame. While this method avoids the problem of thread corrosion, special tools (such as punches and pliers) are required to remove the pin during disassembly and assembly, making the operation cumbersome. This is especially inefficient in scenarios where wheels are frequently loaded and unloaded (such as express delivery sorting and truck loading and unloading). Furthermore, long-term friction between the pin and the positioning hole can easily lead to gaps and loosening, causing the wheel to wobble, affecting the stability of the handcart and posing a safety hazard.

[0004] Therefore, it is essential to invent a quick-release handcart axle. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a quick-release handcart axle, including a wheel axle, an inner threaded hole, a wheel, an outer threaded barrel, a stud, an inner bushing, and a spring washer. The two end faces of the wheel axle are respectively provided with inner threaded holes, and the wheels with bearings are respectively fitted onto the two ends. The stud provided in the outer threaded barrel is connected to the inner threaded hole. The inner bushing is installed on the outer threaded barrel and is in close contact with the outer surface of the wheel axle. The spring washer is sleeved on the wheel axle and is located between the outer threaded barrel and the wheel.

[0006] Preferably, the internal threaded holes on both ends of the wheel axle are engaged with the external threaded stud, and the two are connected by threaded engagement. One end of the stud is integrally formed with the interior of the external threaded head cylinder.

[0007] Preferably, the outer screw head is a hollow hexagonal sleeve structure with a circular hole inside, and the inner bushing is installed thereon. The inner surface of the inner bushing has an annular groove, and the annular groove is filled with resin.

[0008] Preferably, the opening of the external threaded barrel faces the wheel and the spring washer, the outer diameter of the spring washer is larger than the inner diameter of the opening of the external threaded barrel, and the side of the spring washer is in close contact with the side of the inner ring of the bearing on which the wheel is mounted.

[0009] Compared with the prior art, the present invention has the following beneficial effects: This invention transfers the threaded connection from the "outer surface of the axle" to the "inner threaded holes on both ends of the axle," completely hiding the threaded structure inside the axle. This completely avoids the problems of water stains and dust adhesion caused by exposed external threads, reducing the risk of thread corrosion and scaling at the source. At the same time, during assembly, the bearing embedded in the wheel only contacts the smooth outer surface of the axle, eliminating the possibility of direct impact on the threads, effectively protecting the integrity of the threads and significantly extending the service life of the axle.

[0010] This utility model features an external threaded sleeve with a hollow hexagonal sleeve structure. No special tools are required; the fit between the stud and the internal threaded hole can be quickly tightened / loosened using a regular wrench. Compared to the traditional pin-shaft fixing method, this shortens the disassembly and assembly time. Furthermore, the integrated design of the stud and the external threaded sleeve avoids the problem of losing scattered parts, further improving the ease of operation. It is especially suitable for scenarios where wheels need to be frequently loaded and unloaded.

[0011] The inner bushing installed inside the outer screw head barrel of this utility model is in close contact with the outer surface of the axle, and the resin filled in the annular groove of the inner bushing can form a sealing layer, effectively preventing external impurities from entering the inner screw hole; at the same time, the spring washer is clamped between the outer screw head barrel and the wheel bearing, and the gap is eliminated by the elastic preload. This not only prevents the stud from loosening due to vibration during vehicle pushing, but also provides stable positioning for the inner ring of the bearing, avoiding wheel wobbling and improving pushing safety. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0013] Figure 2 This is an exploded structural diagram of the present invention.

[0014] In the picture: 1. Wheel axle; 2. Inner threaded hole; 3. Wheel; 4. Outer threaded head; 5. Stud; 6. Inner bushing; 7. Spring washer. Detailed Implementation

[0015] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0016] In the description of the embodiments, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of the utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in the present utility model based on the specific circumstances.

[0017] As attached Figure 1 To be continued Figure 2 As shown: This utility model provides a quick-release handcart axle, including a wheel axle 1, an inner threaded hole 2, a wheel 3, an outer threaded cylinder 4, a stud 5, an inner bushing 6, and a spring washer 7. The wheel axle 1 has an inner threaded hole 2 on each of its two end faces, and the wheel 3, which is fitted with a bearing, is respectively fitted at both ends. The stud 5 in the outer threaded cylinder 4 is connected to the inner threaded hole 2. The inner bushing 6 is installed on the outer threaded cylinder 4 and is in close contact with the outer surface of the wheel axle 1. The spring washer 7 is fitted on the wheel axle 1 and is located between the outer threaded cylinder 4 and the wheel 3.

[0018] Furthermore, both ends of the wheel axle 1 are machined with internal threaded holes 2 along the axial direction. The thread specification of the internal threaded holes 2 is M12×1.5, which forms a precision fit with the external thread machined on the outer surface of the stud 5. The thread engagement length of the two is not less than 15mm to ensure connection strength. The stud 5 is made of 45# steel after quenching and tempering. One end of it is integrally formed with the inside of the outer threaded head cylinder 4 through a hot forging process. The transition radius of the connection is ≥3mm to avoid stress concentration. The coaxiality error between the stud 5 and the outer threaded head cylinder 4 is controlled within 0.05mm to ensure uniform force during tightening and prevent one-sided thread wear.

[0019] Furthermore, the external threaded head 4 is cold-forged from 304 stainless steel and has a hollow hexagonal sleeve structure with a hexagonal side-to-side width of 19mm (compatible with a standard 19mm wrench). The external threaded head 4 has a circular hole along its axis inside. The inner bushing 6 is made of nitrile rubber and is fixed in the circular hole of the external threaded head 4 by injection molding. Its inner surface has 2-3 annular grooves spaced axially. The grooves are filled with high-temperature resistant epoxy resin. After the epoxy resin cures, it forms a tightly fitting sealing layer with the outer surface of the wheel axle 1, effectively preventing water stains and dust from entering the inner threaded hole 2.

[0020] Furthermore, the open end of the outer screw head 4 faces the wheel 3 and the spring washer 7. The spring washer 7 is made of 65Mn spring steel and is stamped. Its outer diameter is larger than the inner diameter of the opening of the outer screw head 4, and its inner diameter is larger than the outer diameter of the wheel axle 1. In the assembled state, one side of the spring washer 7 is fully in contact with the open end face of the outer screw head 4, and the other side is in close contact with the inner ring side of the bearing embedded in the wheel 3. The elastic deformation of the spring washer 7 generates a preload force, which not only forms an axial limit on the inner ring of the bearing, but also offsets the vibration and impact during vehicle operation, and prevents the fit between the stud 5 and the inner screw hole 2 from loosening.

[0021] The working principle is as follows: First, during assembly, the wheels 3 with bearings are respectively fitted onto both ends of the wheel axle 1, so that the wheels 3 can rotate freely along the wheel axle 1; then, the spring washer 7 is placed on the wheel axle 1 and placed against the inner ring side of the bearing of the wheel 3, leaving a position for the subsequent installation of the outer threaded cylinder 4; then, the stud 5 inside the outer threaded cylinder 4 is aligned with the inner threaded hole 2 on the end face of the wheel axle 1, and the stud 5 is gradually engaged with the inner threaded hole 2 by rotating the outer threaded cylinder 4, so that the outer threaded cylinder 4 slowly moves closer to the spring washer 7.

[0022] As the outer screw head 4 continues to tighten, the inner bushing 6 installed inside it gradually comes into close contact with the outer surface of the wheel axle 1; then the high-temperature resistant epoxy resin sealing layer in the annular groove on the inner side of the inner bushing 6 adheres to the surface of the wheel axle 1, forming a sealing barrier that effectively prevents external water stains and dust from entering the inner screw hole 2; then the outer screw head 4 continues to tighten to the preset position, and the spring washer 7 is compressed between the bearing inner ring of the wheel 3 and the outer screw head 4, generating a continuous preload force through its own elastic deformation.

[0023] When disassembly is required, first rotate the outer screw head 4 in the opposite direction to gradually disengage the stud 5 from the inner screw hole 2 on the end face of the wheel axle 1; then remove the outer screw head 4 from the wheel axle 1 along with the stud 5; then remove the spring washer 7 and the wheel 3 with the bearing from the wheel axle 1 in sequence to complete the quick disassembly of the entire axle assembly.

[0024] Any technical solution that achieves the above-mentioned technical effects by utilizing the technical solution described in this utility model, or by designing a similar technical solution inspired by the technical solution described in this utility model, falls within the protection scope of this utility model.

Claims

1. A quick-release handcart axle, characterized in that, The assembly includes a wheel axle (1), an inner threaded hole (2), a wheel (3), an outer threaded head cylinder (4), a stud (5), an inner bushing (6), and a spring washer (7). The two end faces of the wheel axle (1) are respectively provided with inner threaded holes (2), and the two ends are respectively fitted with the wheel (3) with bearings. The stud (5) provided in the outer threaded head cylinder (4) is connected to the inner threaded hole (2). The inner bushing (6) is installed on the outer threaded head cylinder (4) and is in close contact with the outer surface of the wheel axle (1). The spring washer (7) is sleeved on the wheel axle (1) and is located between the outer threaded head cylinder (4) and the wheel (3).

2. The quick-release handcart axle as described in claim 1, characterized in that: The threads of the internal threaded holes (2) provided on both ends of the wheel axle (1) are engaged with the external threads of the stud (5), and the two are connected together by threaded engagement. One end of the stud (5) is integrally set with the interior of the external threaded head cylinder (4).

3. The quick-release handcart axle as described in claim 2, characterized in that: The outer screw head cylinder (4) is a hollow hexagonal sleeve structure with a circular hole inside, and the inner bushing (6) is installed thereon. The inner surface of the inner bushing (6) is provided with an annular groove, and the annular groove is filled with resin.

4. The quick-release handcart axle as described in claim 3, characterized in that: The opening of the external screw head (4) faces the wheel (3) and the spring washer (7). The outer diameter of the spring washer (7) is larger than the inner diameter of the opening of the external screw head (4). The side of the spring washer (7) is in close contact with the side of the inner ring of the bearing installed on the wheel (3).

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