Narrow-version small-fall wading heavy truck axle

Abstract

A narrow-version small-fall wading heavy truck axle comprises a front axle and a steering knuckle assembly, the upper portion and the lower portion of the inner side of the steering knuckle assembly are arranged on steering knuckle pins in a sleeving mode respectively, a straight pull rod arm is further arranged at the top of the inner side of the steering knuckle assembly, and a brake assembly is fixed to the outer side wall of a disc-shaped structure of the steering knuckle assembly. A front hub capable of rotating freely is supported on the periphery of the cylindrical structure of the steering knuckle assembly through a tapered roller bearing, a multi-lip box type oil seal and an O-shaped sealing ring are sequentially arranged between the inner end of the cylindrical structure of the front hub and the outer side wall of the disc-shaped structure of the steering knuckle assembly from outside to inside, and the outer end of the front hub is covered with a hub end cover for sealing. According to the utility model, the multi-lip box type oil seal design is adopted, and the interference and O-shaped sealing ring design is adopted at the shaft diameter part of the steering knuckle, so that muddy water and sundries are effectively prevented from invading; an O-shaped sealing ring design is adopted at the axle diameter of the knuckle, so that external dust and muddy water are effectively prevented from entering, and normal operation of parts is guaranteed after the vehicle wades into water.

Description

Technical Field

[0001] The utility model relates to a front axle, in particular to a narrow-width small-drop wading heavy truck axle. Background Art

[0002] With the enhancement of people's awareness of green, low-carbon and environmental protection, at present, each automobile factory has increased the research and development efforts on lightweight vehicle models to reduce the vehicle's own weight. The use environment of engineering dump trucks is still relatively complex, with large undulations in terrain, and higher requirements for heavy truck axles, which require good passability, heavy load, frequent braking, wading, lightweight and other characteristics. However, the sealing performance of the bearing part of the current heavy truck axle needs to be improved. Inadequate sealing is likely to cause damage to the bearings by impurities such as fine dust, sediment, and water. Content of the Utility Model

[0003] In order to solve the above problems, the purpose of the utility model is to provide a narrow-width small-drop wading heavy truck axle.

[0004] To achieve the above purpose, the technical solution of the utility model is: a narrow-width small-drop wading heavy truck axle, including a front axle and a steering knuckle assembly. Each end of the front axle bends upward and then is horizontally arranged, and steering knuckle pins arranged vertically are respectively provided at both ends. The axis lines of the vertically arranged steering knuckle pins are on the same straight line. The inner sides of the upper and lower parts of the steering knuckle assembly are respectively sleeved on the steering knuckle pins. A straight pull rod arm is further provided at the top of the inner side of the steering knuckle assembly. A brake assembly is fixed on the outer wall of the disc-shaped structure of the steering knuckle assembly. The outer periphery of the cylindrical structure of the steering knuckle assembly is supported by tapered roller bearings with a freely rotatable front wheel hub. And the brake assembly is located in the brake drum of the front wheel hub. Between the inner end of the cylindrical structure of the front wheel hub and the outer wall of the disc-shaped structure of the steering knuckle assembly, a multi-lip cartridge oil seal and an O-ring are successively arranged from outside to inside. The outer end of the front wheel hub is covered with a hub end cover for sealing.

[0005] Further, the brake assembly includes a cam and symmetrically arranged brake shoe with friction plate assemblies. The brake shoe with friction plate assemblies are rotatably arranged on a friction plate fixing disc. The friction plate fixing disc is fixed on the outer wall of the disc-shaped structure of the steering knuckle assembly by bolts. The camshaft of the cam penetrates through the friction plate fixing disc, and the cam is located between one ends of the two brake shoe with friction plate assemblies on both sides. The two ends of the two brake shoe with friction plate assemblies are elastically connected by a tension spring. The other end of the camshaft extends to the outside of the brake drum and is fixed with a self-adjusting arm. The end of the self-adjusting arm is rotatably connected to the friction plate fixing disc through an air chamber.

[0006] Further, an electronic wear alarm is fixed in the mounting hole of one of the brake shoe with friction plate assemblies.

[0007] Furthermore, the brake shoe with friction plate assembly contacts the stepped shoe shaft through a semi-cylindrical surface, enabling the brake shoe with friction plate assembly to rotate and contact the side surface of the stepped shoe shaft through the semi-cylindrical surface. The stepped shoe shaft is fixed on the friction plate fixing disc.

[0008] Furthermore, the multi-lip cartridge oil seal and the O-ring seal are separated by an annular gasket.

[0009] With the above settings, the present utility model has the following advantages:

[0010] (1) Adopt a narrow-width front axle with a small drop and lightweight design, reducing the weight by about 15 kg.

[0011] Adopt a variable cross-section design. The length is shortened by 10.21% compared with the conventional model, the drop is reduced by 48% compared with the conventional model, and the weight can be reduced by 16%. By using finite element simulation and CAE analysis technology, the cross-section of the front axle is optimized multiple times, reducing the weight by 15 kg per piece compared with the conventional model; while ensuring good passability of the vehicle, it can effectively reduce the self-weight of the product, and at the same time ensure that the fatigue life and stiffness meet the customer's requirements.

[0012] (2) Match a waterproof wheel end system.

[0013] Adopt a multi-lip cartridge oil seal design, and an interference fit with an additional type seal ring is used at the knuckle shaft diameter, effectively blocking the intrusion of mud and debris; an O-ring seal design is adopted at the knuckle shaft diameter, effectively preventing external dust and mud from entering, and ensuring the normal operation of the components after the vehicle wades through water.

[0014] (3) Match a lightweight and efficient braking system.

[0015] Semi-open braking system: Adopt semi-open lightweight components, reducing the weight by 10% compared with the conventional semi-open structure, about 8 kg per axle. This lightweight air brake is newly developed and matches a larger air chamber, which can effectively prevent the brake shoe iron from getting stuck and not returning, and can achieve good braking performance, effectively extending the service life of the components, providing safer services for users. The air chamber adopts a 27-inch lightweight single-chamber air chamber without a clamp, with a brake air pressure test joint, ensuring lightweight and compliance with regulations, and increasing the braking torque by 16%. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present utility model will be further described in conjunction with the accompanying drawings.

[0017] Figure 1 is the front view structural schematic diagram of the present utility model;

[0018] Figure 2 is the side view structural schematic diagram of the brake assembly part of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] AsFigure 1-2 As shown in the figure, a narrow-width wading heavy truck axle with a small drop includes a front axle 1 and a steering knuckle assembly 2. Each end of the front axle 1 bends upward and is horizontally arranged, and steering knuckle pins 3 arranged vertically are respectively provided at both ends. The axis lines of the vertically arranged steering knuckle pins 3 are on the same straight line. The inner sides of the upper and lower parts of the steering knuckle assembly 2 are respectively sleeved on the steering knuckle pins 3. A straight pull rod arm 4 is also provided at the inner top of the steering knuckle assembly 2. A brake assembly 5 is fixed on the outer side wall of the disc-shaped structure of the steering knuckle assembly 2. A freely rotatable front wheel hub 7 is supported by tapered roller bearings 6 around the cylindrical structure of the steering knuckle assembly 2. And the brake assembly 5 is located in the brake drum 8 of the front wheel hub 7. Between the inner end of the cylindrical structure of the front wheel hub 7 and the outer side wall of the disc-shaped structure of the steering knuckle assembly 2, a multi-lip cartridge oil seal 9 and an O-ring seal 10 are respectively arranged from outside to inside in sequence. The outer end of the front wheel hub 7 is covered with a hub end cover 11 for sealing. The multi-lip cartridge oil seal 9 and the O-ring seal 10 are separated by an annular gasket 12 to ensure good lubrication inside, prevent corrosion, and ensure good driving and steering functions of the whole vehicle.

[0020] Specifically: The brake assembly 5 includes a cam 502 and symmetrically arranged brake shoe with friction plate assemblies 501. The brake shoe with friction plate assemblies 501 is rotatably arranged on a friction plate fixing disc 503. The friction plate fixing disc 503 is fixed on the outer side wall of the disc-shaped structure of the steering knuckle assembly 2 by bolts. The camshaft of the cam 502 penetrates through the friction plate fixing disc 503, and the cam 502 is located between one ends of the two brake shoe with friction plate assemblies 501 on both sides. The two ends of the two brake shoe with friction plate assemblies 501 are elastically connected by a tension spring. The other end of the camshaft extends to the outside of the brake drum 8 and is fixed with a self-adjusting arm 504. The end of the self-adjusting arm 504 is rotatably connected to the friction plate fixing disc 503 through an air chamber 505;

[0021] An electronic wear alarm 507 is fixed in the mounting hole of one of the brake shoe with friction plate assemblies 501. As the brake shoe with friction plate assemblies 501 wears, when it reaches the wear limit value, the electronic wear alarm 507 realizes the wear alarm function to prompt the driver to replace parts. The brake shoe with friction plate assemblies 501 contacts the stepped shoe shaft 506 with a semi-cylindrical surface, so that the brake shoe with friction plate assemblies 501 rotates and contacts the side surface of the stepped shoe shaft 506 through the semi-cylindrical surface. The stepped shoe shaft 506 is fixed on the friction plate fixing disc 503. This connection method can effectively reduce the friction force and the contact area, ensuring that the brake shoe with friction plate assemblies 501 returns well and is not corroded and stuck.

[0022] The working principle of the present utility model:

[0023] The same as the current front axle drive, steering and braking methods, the steering knuckle assembly is rigidly connected to the front axle through the steering knuckle pin and can rotate, and then connected to the drag link arm with hexagon flange bolts. The brake assembly is installed on the steering knuckle assembly. The vehicle's air pipeline intakes air into the air chamber. The air chamber pushes the cam connected to the self-adjusting arm on the brake assembly, causing the friction pads to expand and press against the brake drum, generating a frictional torque. This torque is transmitted to the wheel through the front hub and hub bolts and nuts, causing the entire vehicle to decelerate. The greater the braking force, the greater the vehicle deceleration, forming the entire vehicle braking process and realizing the functions of steering, load bearing, and braking.

[0024] The above are only the schematic specific implementation manners of the present utility model and are not intended to limit the scope of the present utility model. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of the present utility model shall fall within the scope of protection of the present utility model.

Claims

1. A narrow-section, small-drop wading heavy truck bridge, comprising a front axle (1) and a steering knuckle assembly (2), wherein each end of the front axle (1) is bent upward and arranged horizontally, and steering knuckle pins (3) arranged vertically are respectively arranged at both ends, and the axis lines of the steering knuckle pins (3) arranged vertically are on the same straight line, and the inner side of the steering knuckle assembly (2) is respectively sleeved on the steering knuckle pins (3) at the upper and lower sides, and a straight tie rod arm (4) is also arranged at the inner top of the steering knuckle assembly (2), characterized in that: A brake assembly (5) is fixed to the outer wall of the disc-shaped structure of the steering knuckle assembly (2); a freely rotatable front wheel hub (7) is supported on the outer periphery of the cylindrical structure of the steering knuckle assembly (2) via a tapered roller bearing (6); the brake assembly (5) is located in a brake drum (8) of the front wheel hub (7); a multi-lip box-type oil seal (9) and an O-ring (10) are arranged in sequence from outside to inside between the inner end of the cylindrical structure of the front wheel hub (7) and the outer wall of the disc-shaped structure of the steering knuckle assembly (2); and the outer end of the front wheel hub (7) is covered with a wheel hub end cover (11) for sealing.

2. A narrow-section, small-drop wading heavy truck bridge as claimed in claim 1, characterized in that: The brake assembly (5) comprises a cam (502) and a symmetrically arranged brake shoe with friction plate assembly (501). The brake shoe with friction plate assembly (501) is rotatably arranged on a friction plate fixing plate (503). The friction plate fixing plate (503) is fixed to the outer wall of the disc-shaped structure of the steering knuckle assembly (2) by bolts. The camshaft of the cam (502) passes through the friction plate fixing plate (503). The cam (502) is located between one end of the brake shoe with friction plate assembly (501) on both sides. The two ends of the brake shoe with friction plate assembly (501) are elastically connected by a tension spring. The other end of the camshaft extends to the outside of the brake drum (8) and is fixed with a self-adjusting arm (504). The end of the self-adjusting arm (504) is rotatably connected to the friction plate fixing plate (503) through an air chamber (505).

3. A narrow-section, small-drop wading heavy truck bridge as claimed in claim 2, characterized in that: An electronic wear alarm (507) is fixed in the mounting hole of one of the brake shoe with friction plate assemblies (501).

4. A narrow-section, small-drop wading heavy truck bridge as claimed in claim 2, characterized in that: The brake shoe with friction plate assembly (501) contacts the stepped shoe plate shaft (506) through a semicircular cylindrical surface, so that the brake shoe with friction plate assembly (501) is in rotational contact with the side of the stepped shoe plate shaft (506) through the semicircular cylindrical surface, and the stepped shoe plate shaft (506) is fixed on the friction plate fixing plate (503).

5. The narrow-section, small-drop wading heavy truck bridge according to claim 1, characterized in that: The multi-lip box-type oil seal (9) and the O-ring (10) are separated by an annular gasket (12).

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