A gear for a truck brake adjusting arm

Abstract

The utility model relates to vehicle braking technical field discloses a gear for truck brake adjusting arm, including gear body and one way clutch, one way clutch installs in gear body inner wall, the inner wall of gear body is equipped with internal spline, one way clutch outer wall is equipped with external spline, internal spline and external spline interlock, the inner wall of gear body is equipped with the protection assembly for the lubrication of internal spline and external spline interlock place, the utility model discloses the protection assembly for setting up in the inside of gear body provides the sustained, reliable targeted lubrication for the internal spline and external spline interlock part between gear body and one way clutch, has effectively inhibited the fretting wear, reduced operating noise and commutation impact, and can supplement the lubricating grease through convenient maintenance interface, thereby has prolonged the service life of gear body significantly, has promoted truck brake adjusting arm trigger signal's accuracy and the reliability of whole braking system.

Description

Technical Field

[0001] This utility model relates to the field of vehicle braking technology, specifically to a gear for adjusting the brake arm of a truck. Background Technology

[0002] The truck brake adjusting arm is a core component of the drum brake system. Its core function is to automatically compensate for the increased brake clearance caused by brake pad wear, ensuring that the braking performance is always at its best. This function is achieved through a set of precision mechanical mechanisms inside the adjusting arm. When the brake return stroke exceeds the set value due to excessive clearance, the mechanism triggers the adjustment action. Among them, the gear, as a key sensing and signal transmission element, converts linear displacement into rotational motion by meshing with the rack, thereby driving the one-way clutch and other operations, and ultimately controlling the worm gear pair to perform clearance compensation.

[0003] The automatic brake clearance adjustment arm disclosed in CN2500864Y is composed of components such as a pressure spring, a shaft, a worm gear, and a worm. The power generated when the car brakes drives the rack to move, causing the worm gear and worm to make corresponding circular movements to adjust the clearance between the brake drum and the friction pads, thereby achieving the purpose of automatically adjusting the brake clearance. This utility model has a compact structure, is easy to use and maintain, and is particularly suitable for vehicles operating in harsh traffic conditions such as urban traffic and mountain roads where braking is frequent.

[0004] While the aforementioned device achieves basic automatic adjustment functions, facilitating maintenance, its internal transmission pairs, particularly the splined connection between the gear and the one-way clutch, operate under high-frequency, low-amplitude forward and reverse rotation conditions for extended periods. This leads to grease loss and oxidation at the splined connection, causing fretting wear. This not only increases operating noise and reversing impact but also results in inaccurate trigger signals due to increased wear clearance, potentially causing incorrect adjustments or even adjustment failures. Therefore, those skilled in the art provide a gear for a truck brake adjusting arm to address the problems mentioned in the background section. Utility Model Content

[0005] The purpose of this utility model is to provide a gear for adjusting the brake arm of a truck, which solves the problems mentioned in the background art above.

[0006] This utility model provides the following technical solution: a gear for adjusting the brake arm of a truck, comprising a gear body and a one-way clutch, wherein the one-way clutch is installed on the inner wall of the gear body, the inner wall of the gear body is provided with an internal spline, the outer wall of the one-way clutch is provided with an external spline, the internal spline and the external spline mesh with each other, and a protective component for lubricating the meshing of the internal spline and the external spline is installed on the inner wall of the gear body.

[0007] As a preferred embodiment of the above technical solution, the protection component includes a mounting groove, in which a fixing ring is slidably mounted, and an annular oil storage groove is provided on one side of the fixing ring, and an annular oil felt is provided in the annular oil storage groove.

[0008] As a preferred embodiment of the above technical solution, the inner wall of the annular oil storage tank is provided with a plurality of oil drain holes, which are arranged in a ring array and are directly opposite the meshing point of the inner spline and the outer spline.

[0009] As a preferred embodiment of the above technical solution, a stepped oil injection hole is provided on one side of the gear body. The stepped oil injection hole is connected to the inner wall of the annular oil reservoir. The inner wall of the stepped oil injection hole is provided with an internal thread. A one-way valve is fixedly installed in the middle of the inner wall of the stepped oil injection hole. The output end of the one-way valve is directly opposite the annular oil reservoir.

[0010] As a preferred embodiment of the above technical solution, two symmetrically arranged buckle grooves are provided on one side of the fixing ring, and the fixing ring is interference-fitted with the inner wall of the mounting groove.

[0011] As a preferred embodiment of the above technical solution, two annular sealing gaskets are fixedly connected to one side of the fixing ring, and the annular sealing gaskets are made of fluororubber.

[0012] Compared with the prior art, the beneficial effects of this utility model are: This device achieves targeted, long-lasting, and controllable lubrication at the meshing point of the internal and external splines by setting protective components inside the gear body. It effectively suppresses fretting wear caused by vibration of the internal and external splines, significantly reduces operating noise and reversing impact, and allows for convenient replenishment of grease through stepped oil injection holes. The grease is continuously and slowly released to the meshing point of the internal and external splines by the oil felt, forming a long-lasting protective oil film. This greatly extends the service life of the gear body and the one-way clutch, and improves the reliability and safety of the truck braking system. Attached Figure Description

[0013] Figure 1 A schematic diagram of the main structure of a gear for adjusting a truck brake arm; Figure 2 A schematic diagram of the external spline structure of a gear for a truck brake adjusting arm; Figure 3 A schematic diagram of the internal spline structure of a gear for a truck brake adjusting arm; Figure 4 A schematic diagram of the slotted structure of a gear for a truck brake adjusting arm; Figure 5 A schematic diagram of a mounting groove structure for a gear used in a truck brake adjusting arm; Figure 6 A cross-sectional view of a retaining ring structure for a gear used in a truck brake adjusting arm; Figure 7 This is a schematic diagram of a stepped oil injection hole structure for a gear used in a truck brake adjusting arm.

[0014] Legend: 1. Gear body; 2. One-way clutch; 3. Internal spline; 4. External spline; 5. Protective component; 501. Mounting groove; 502. Retaining ring; 503. Annular oil reservoir; 504. Annular oil felt; 505. Oil drain hole; 506. Stepped oil filling hole; 507. Internal thread; 508. One-way valve; 6. Thread groove; 7. Annular sealing gasket. Detailed Implementation

[0015] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0016] Please see Figures 1-7 As shown, this utility model provides a technical solution: a gear for adjusting the brake arm of a truck, including a gear body 1 and a one-way clutch 2. The one-way clutch 2 is installed on the inner wall of the gear body 1. The inner wall of the gear body 1 is provided with an inner spline 3, and the outer wall of the one-way clutch 2 is provided with an outer spline 4. The inner spline 3 and the outer spline 4 mesh with each other. A protective component 5 for lubricating the meshing joint of the inner spline 3 and the outer spline 4 is installed on the inner wall of the gear body 1.

[0017] Furthermore, the protective component 5 installed inside the gear body 1 provides continuous and reliable targeted lubrication to the meshing parts of the internal spline 3 and external spline 4 between the gear body 1 and the one-way clutch 2, effectively suppressing fretting wear, reducing operating noise and reversing impact, and allowing for the replenishment of grease through a convenient maintenance interface, thereby significantly extending the service life of the gear body 1 and improving the accuracy of the truck brake adjustment arm trigger signal and the reliability of the entire braking system.

[0018] It should be noted that the splined fit between the gear body 1 and the one-way clutch 2 together constitutes the core signal triggering and one-way transmission mechanism for the automatic adjustment function of the brake adjusting arm. The gear body 1, as a sensing element, accurately converts the linear stroke transmitted from the rack, which reflects the size of the brake clearance, into rotational motion. The one-way clutch 2, as a crucial execution intermediary, ensures that this rotational motion can only be transmitted unidirectionally and irreversibly to the subsequent clutch and worm gear mechanism, thereby ultimately driving the S camshaft to rotate slightly to compensate for the clearance, ensuring the accuracy, reliability, and anti-interference of the adjustment action. The one-way clutch 2 is existing technology, consisting of an outer ring, an inner ring, and a wedge-shaped roller or ratchet mechanism between them. The working principle of the one-way clutch 2 is to achieve one-way overtaking by using geometric constraints or inclined plane effects. When the gear body 1 rotates in the forward direction, the roller or ratchet weds the inner and outer rings under friction, transmitting torque to trigger the subsequent mechanism. When rotating in the reverse direction or receiving a reverse impact, the mechanism quickly releases the wedged state and enters the free-running slip friction state, thereby strictly ensuring the one-way and irreversible nature of power transmission and effectively preventing adjustment failure caused by the back transmission of braking force. This will not be elaborated further here.

[0019] As one implementation method in this embodiment, please refer to Figures 5-6 As shown, the protective component 5 includes a mounting groove 501, a fixing ring 502 is slidably installed in the mounting groove 501, an annular oil storage groove 503 is provided on one side of the fixing ring 502, and an annular oil felt 504 is provided in the annular oil storage groove 503. The inner wall of the annular oil storage tank 503 is provided with multiple oil drain holes 505, which are arranged in a ring array and are directly opposite the meshing point of the inner spline 3 and the outer spline 4.

[0020] Furthermore, the annular oil felt 504 is pre-injected with grease and stored in the annular oil reservoir 503. Under the combined action of capillary action and slight centrifugal force, the grease in the annular oil felt 504 slowly and continuously seeps out through multiple oil drain holes 505. These oil drain holes 505 are precisely aligned with the meshing points of the inner spline 3 and outer spline 4 below, achieving targeted lubrication and ensuring that the grease is accurately delivered to the working surface that needs it most, forming a protective oil film. This transforms the dry friction between the inner spline 3 and outer spline 4 into liquid friction within the oil film, greatly reducing wear. At the same time, the protective oil film buffers the impact and vibration between the inner spline 3 and outer spline 4 when the gear body 1 reverses direction, making the operation smoother and quieter. This greatly extends the service life of the gear body 1 and the one-way clutch 2, and improves the reliability and safety of the truck braking system.

[0021] As one implementation method in this embodiment, please refer to Figure 3 and Figure 7As shown, a stepped oil injection hole 506 is provided on one side of the gear body 1. The stepped oil injection hole 506 is connected to the inner wall of the annular oil reservoir 503. The inner wall of the stepped oil injection hole 506 is provided with an internal thread 507. A one-way valve 508 is fixedly installed in the middle of the inner wall of the stepped oil injection hole 506. The output end of the one-way valve 508 is directly facing the annular oil reservoir 503.

[0022] Furthermore, when the grease in the annular oil felt 504 is depleted, without disassembling the assembly, new grease can be added to the annular oil felt 504 through the stepped oil injection hole 506 by using a dedicated grease gun connector screwed into the internal thread 507 on the inner wall of the stepped oil injection hole 506. The one-way valve 508 inside the stepped oil injection hole 506 only allows grease to be injected, preventing the internal grease from being squeezed out in the reverse direction under pressure.

[0023] It is worth noting that the one-way valve 508 is existing technology, consisting of a valve body, a valve core, and a preload spring. Its working principle is to achieve one-way flow by balancing the fluid pressure and the spring preload force. When the external grease gun applies pressure to inject grease, the grease pressure overcomes the spring force to push the valve core open, allowing the grease to flow into the annular oil reservoir 503. When the grease injection stops, the spring preload force quickly pushes the valve core back to its original position and presses the valve seat to form a seal, thereby effectively preventing the internal grease from leaking back and completely isolating external dust, moisture, and other contaminants from entering the annular oil reservoir 503, ensuring the cleanliness and continuous positive pressure inside the annular oil reservoir 503.

[0024] As one implementation method in this embodiment, please refer to Figures 4-6 As shown, two symmetrically arranged snap grooves 6 are provided on one side of the fixing ring 502, and the fixing ring 502 is interference-fitted with the inner wall of the mounting groove 501.

[0025] Furthermore, the symmetrically arranged grooves 6 provide a force application point for special tools, making the pressing and disassembly of the retaining ring 502 simple and reliable, greatly improving maintenance efficiency. At the same time, the interference fit between the retaining ring 502 and the inner wall of the mounting groove 501 ensures high strength and high sealing performance of the two, effectively preventing grease leakage and ensuring the long-term structural stability of the protective component 5 under vibration conditions.

[0026] As one implementation method in this embodiment, please refer to Figure 6 As shown, two annular sealing gaskets 7 are fixedly connected to one side of the fixing ring 502. The annular sealing gaskets 7 are made of fluororubber.

[0027] Furthermore, the fluororubber annular sealing gasket 7, with its excellent high-temperature resistance and oil solubility, ensures a durable and reliable static seal between the retaining ring 502 and the inner wall of the mounting groove 501 under the harsh operating conditions of the truck braking system, preventing the possibility of grease leakage from the retaining ring 502 and ensuring the purity and continuous supply of lubricant inside the protective component 5.

[0028] Working principle: The internal spline 3 inside the gear body 1 meshes with the external spline 4 of the one-way clutch 2, converting the rotational motion of the gear body 1 into a one-way action that can trigger subsequent brake adjustment. The annular oil felt 504 inside the protective component 5 is soaked with pre-injected grease and stored in the annular oil reservoir 503. Under the combined action of capillary action and slight centrifugal force, the grease in the annular oil felt 504 will slowly and continuously seep out through multiple oil drain holes 505. These oil drain holes 505 are precisely aligned with the meshing points of the internal spline 3 and external spline 4 below, achieving targeted lubrication and ensuring that the grease is accurately delivered to the working surface that needs it most, forming a protective oil film. This transforms the dry friction between the internal spline 3 and external spline 4 into liquid friction within the oil film, greatly reducing wear. At the same time, the protective oil film buffers the impact and vibration between the internal spline 3 and external spline 4 when the gear body 1 reverses direction, making the operation smoother and quieter, greatly extending the service life of the gear body 1 and the one-way clutch 2, and improving the reliability and safety of the truck braking system. When the grease in the annular oil felt 504 is depleted, there is no need to disassemble the assembly. New grease can be added to the annular oil felt 504 through the stepped oil injection hole 506 by using a special grease gun connector screwed into the internal thread 507 on the inner wall of the stepped oil injection hole 506. The one-way valve 508 inside the stepped oil injection hole 506 only allows grease to be injected, preventing the internal grease from being squeezed out in the reverse direction under pressure.

[0029] The above embodiments are only used to illustrate the technical solution of this utility model, and are not intended to limit it.

Claims

1. A gear for adjusting a truck brake arm, comprising a gear body (1) and a one-way clutch (2), characterized in that: The one-way clutch (2) is installed on the inner wall of the gear body (1). The inner wall of the gear body (1) is provided with an inner spline (3), and the outer wall of the one-way clutch (2) is provided with an outer spline (4). The inner spline (3) and the outer spline (4) mesh with each other. The inner wall of the gear body (1) is provided with a protective component (5) for lubricating the meshing of the inner spline (3) and the outer spline (4). The protective component (5) includes a mounting groove (501), in which a fixing ring (502) is slidably installed. An annular oil storage groove (503) is provided on one side of the fixing ring (502), and an annular oil felt (504) is provided in the annular oil storage groove (503).

2. The gear for adjusting a truck brake arm according to claim 1, characterized in that: The inner wall of the annular oil storage tank (503) is provided with a plurality of oil drain holes (505), which are arranged in a ring array and are directly opposite the meshing point of the inner spline (3) and the outer spline (4).

3. The gear for adjusting a truck brake arm according to claim 2, characterized in that: A stepped oil injection hole (506) is provided on one side of the gear body (1). The stepped oil injection hole (506) is connected to the inner wall of the annular oil reservoir (503). The inner wall of the stepped oil injection hole (506) is provided with an internal thread (507). A one-way valve (508) is fixedly installed in the middle of the inner wall of the stepped oil injection hole (506). The output end of the one-way valve (508) is directly opposite the annular oil reservoir (503).

4. The gear for adjusting a truck brake arm according to claim 1, characterized in that: The fixing ring (502) has two symmetrically arranged buckle grooves (6) on one side, and the fixing ring (502) is interference-fitted with the inner wall of the mounting groove (501).

5. A gear for adjusting a truck brake arm according to claim 2, characterized in that: Two annular sealing gaskets (7) are fixedly connected to one side of the fixing ring (502), and the annular sealing gaskets (7) are made of fluororubber.

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