Hydraulic brake

Abstract

The utility model relates to a hydraulic brake, and belongs to the technical field of hydraulic transmission. A body shell and a spigot cover are fixedly connected through a bolt and form a containing cavity with an output shaft, two bearing radial supports are arranged on the output shaft, a front bearing is installed in a body shell hole and limits the output shaft in the single direction, a rear bearing of a grinding supporting body is installed in a spigot cover hole, and a plane bearing is adopted to limit the output shaft in the other direction. The utility model has the advantages of compact structure, short axial dimension, simple integral structure, good manufacturability, and good assembly and maintenance manufacturability.

Description

Technical Field

[0001] The utility model relates to a hydraulic brake, in particular to a normally closed static hydraulic brake, belonging to the technical field of hydraulic transmission. Background Art

[0002] Hydraulic brakes have a wide range of applications and generally adopt a normally closed static braking method. They can be used in conjunction with a cycloid hydraulic motor drive or used independently. Their structure generally has a long axial dimension and uses ball bearings to support the brake shaft. Their structure generally has a large axial dimension and the braking torque is less than 650Nm. The radial load bearing capacity of the shaft extension is not large.

[0003] Electric-driven scissor lifts, however, have undergone a change in their driving method due to technological advancements. They now use two hydraulic motors for drive, with two brakes for braking and steering. These brakes are mounted directly on the wheel hubs. These brakes require a small axial distance and a high braking torque and radial load capacity (as shown in patent document CN 205226168 U, a hydraulic brake device, which can achieve a braking torque of over 1130 Nm). Consequently, these applications require larger scissor lifts. Smaller scissor lifts, however, have larger radial and axial dimensions and greater braking torque, which do not meet the application requirements. Summary of the Invention

[0004] The purpose of the present utility model is to propose a new type of hydraulic brake in response to the problems existing in the above-mentioned prior art, which is suitable for the miniaturization of electric drive of lifting platforms, has small radial and axial dimensions, a braking torque of up to 450Nm, a certain radial load bearing capacity, a simple and compact structure and a high overall cost performance, and can be installed on the wheel hub, with good manufacturing processability, and good assembly and maintenance processability.

[0005] In order to achieve the above-mentioned purpose, the applicant analyzed the existing technology and structure of hydraulic brakes, and proposed the following technical solution of the utility model based on the special requirements of hydraulic brakes for small-sized scissor lift platforms: a hydraulic brake is composed of a body shell and a stop cover fixedly connected by bolts and forming a cavity with the output shaft, an oil seal and an O-ring seal the cavity for hydraulic oil, and a friction pair, a piston and a spring are arranged in the cavity. The improvement is that two bearings are arranged on the output shaft for radial support, the front bearing is installed in the body shell hole and limits the output shaft in one direction, and the rear bearing is installed in the stop cover hole, a plane bearing is arranged at the rear end of the output shaft, and a retaining ring is arranged between the plane bearing and the stop cover, and the plane bearing limits the output shaft in the other direction.

[0006] The front bearing is a full-complement roller bearing, the rear bearing is a full-complement needle roller bearing, and the needle roller raceway of the rear bearing is a support body made by grinding.

[0007] The piston is provided with a brake oil sealing structure. The piston is provided with two large and small sealing grooves. The sealing groove is provided with a sealing structure of a sealing retainer ring and an O-ring. The sealing structure and the housing hole form a brake oil sealing cavity.

[0008] The entity of the stop cover mounting hole of the rear bearing is embedded in the inner hole of the piston, and a spring is set at a position close to the stop diameter of the stop cover. The spring is installed between the mounting hole set on the piston and the mounting hole set on the stop cover.

[0009] The installation stopper diameter of the stopper cover is Φ95.2mm.

[0010] The oil seal installed on the body shell has a dustproof lip.

[0011] Compared with the hydraulic brakes in the prior art, the technical solution of the utility model meets the needs of small-sized lifting platforms. It has a very compact structure, short axial dimensions, and the output shaft extension can withstand greater radial forces. It has a simple overall structure, good manufacturing processability, and good assembly and maintenance processability. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention is described in further detail below with reference to the accompanying drawings.

[0013] FIG1 is a schematic structural diagram of an embodiment of the present utility model.

[0014] In the figure, output shaft 1, key 2, oil seal 3, front bearing 4, body shell 5, steel plate 6, friction plate 7, small sealing retaining ring 8, small O-ring 9, piston 10, bolt 11, retaining ring 12, plane bearing 13, rear bearing 14, stop cover 15, spring 16, O-ring 17, large sealing retaining ring 18, large O-ring 19, and steel baffle 20.

[0015] FIG2 is a right side view of the brake in the embodiment of FIG1.

[0016] FIG3 is a schematic structural diagram of the oil seal of the brake in the embodiment of FIG1. DETAILED DESCRIPTION

[0017] Example

[0018] The basic structure of a hydraulic brake of this embodiment is shown in Figure 1, which mainly includes an output shaft 1, a body shell 5, a stop cover 15, a front bearing 4, a piston 10, a spring 16 and a friction pair. The friction pair is composed of a steel plate 6 and a friction plate 7. The output shaft 1 is connected to the body shell 5 as a whole through the movement of the friction pair.

[0019] The hydraulic brake is fixedly connected by a body shell 5 and a stop cover 15 with bolts 11 and forms a cavity with the output shaft 1. The oil seal 3 and the O-ring 17 seal the hydraulic oil in the inner cavity of the brake. The formed cavity is provided with a friction pair, a piston 10 and a spring 16. Two bearings are provided on the output shaft 1 for radial support. The front bearing 4 is installed in the hole of the body shell 5 and limits the output shaft 1 in one direction, while the rear bearing 14 is installed separately from the front bearing 4. The rear bearing 14 is installed in the hole of the stop cover 15. The mounting hole of the rear bearing 14 protrudes from the mounting surface of the stop cover 15 and is embedded in the inner hole of the piston 10. A plane bearing 13 is provided at the rear end of the output shaft 1, and a retaining ring 12 is provided between the plane bearing 13 and the stop cover 15. One end of the plane bearing 13 abuts against the rear end face of the output shaft 1, and the retaining ring 12 abuts against the inner hole plane of the stop cover 15. The plane bearing 13 The other direction is limited.

[0020] The front bearing 4 is a full-complement roller bearing. The front bearing 4 structure has a large radial force support capability and can also withstand a certain axial force. The rear bearing 14 is a full-complement needle roller bearing. However, the rear bearing 14 is different from the traditional stamped outer ring needle roller bearing. The needle roller raceway of the rear bearing 14 is a support body made by grinding, that is, the traditional stamped outer ring of the full-complement needle roller bearing is replaced with a steel ground support body.

[0021] The piston 10 incorporates a brake fluid sealing structure. The piston 10 features stepped protrusions at both ends. The large and small steps form a sealed brake fluid cavity. This sealing structure, along with the housing bore, forms a sealed brake fluid cavity. The piston 10 is provided with two large and small sealing grooves, each housing a sealing structure composed of a retaining ring and an O-ring. The retaining rings are positioned on the low-pressure side, i.e., the other side of the sealed brake fluid cavity. The large stepped groove at the large end of the piston 10 houses a large retaining ring 18 and a large O-ring 19, while the small stepped groove at the small end houses a small retaining ring 8 and a small O-ring 9. As shown in Figure 2, a brake fluid port is provided radially within the housing 5, communicating with the sealed brake fluid cavity.

[0022] The mounting hole of the stop cap 15 of the rear bearing 14 is physically embedded in the inner bore of the piston 10. A spring 16 is positioned approximately at the diameter of the stop cap 15 mounting hole. The spring 16 is installed between the mounting holes of the piston 10 and the stop cap 15. A steel baffle 20 is placed between the spring 16 and the piston 10 to balance the spring force on the piston 10.

[0023] The diameter of the installation stop of the stop cover 15 is Φ95.2 mm. A lubricating oil release port is provided at a radial position of the stop cover 15 , and the lubricating oil release port is communicated with the sealed friction pair lubricating oil cavity.

[0024] As shown in FIG3 , the oil seal 3 installed in the housing 5 has a dustproof lip, which can effectively prevent external dust and other debris from entering the cavity when the output shaft 1 rotates.

[0025] The output shaft 1 can be connected via a tapered shaft extension, secured to the external coupling sleeve with a slotted nut. The brake has a short axial structure, with the maximum axial dimension from the stopper mounting surface to the front end of the housing 4 not exceeding 82.5 mm. In addition to the above embodiments, the present invention may also have other implementations, such as modifications to the structure of the piston 10, the installation position of the spring 16, or changes to the outer shape of the housing 4. Any technical solution resulting from equivalent substitution or transformation falls within the scope of protection claimed by this invention.

Claims

1. A hydraulic brake comprising a housing and a stopper cap fixedly connected by bolts to form a chamber with the output shaft, an oil seal and an O-ring sealing the chamber for hydraulic oil, a friction pair, a piston, and a spring disposed within the chamber, characterized in that: Two bearings are provided on the output shaft for radial support. The front bearing is installed in the body shell hole and limits the output shaft in one direction. The rear bearing is installed in the stop cover hole. A plane bearing is provided at the rear end of the output shaft. A retaining ring is provided between the plane bearing and the stop cover. The plane bearing limits the output shaft in the other direction.

2. A hydraulic brake according to claim 1, characterized in that: The front bearing is a full-complement roller bearing, the rear bearing is a full-complement needle roller bearing, and the needle roller raceway of the rear bearing is a support body made by grinding.

3. The hydraulic brake according to claim 1, characterized in that: The piston is provided with a brake oil sealing structure. The piston is provided with two large and small sealing grooves. The sealing groove is provided with a sealing structure of a sealing retainer ring and an O-ring. The sealing structure and the housing hole form a brake oil sealing cavity.

4. The hydraulic brake according to claim 1, characterized in that: A brake oil port is provided at a radial position of the body shell, and the brake oil port is communicated with a sealed brake oil cavity.

5. The hydraulic brake according to claim 2, characterized in that: The entity of the stop cover mounting hole of the rear bearing is embedded in the inner hole of the piston, and a spring is set at a position close to the stop diameter of the stop cover. The spring is installed between the mounting hole set on the piston and the mounting hole set on the stop cover.

6. The hydraulic brake according to claim 5, characterized in that: The installation stopper diameter of the stopper cover is Φ95.2mm.

7. The hydraulic brake according to claim 6, characterized in that: A lubricating oil release port is provided at a radial position of the stop cover, and the lubricating oil release port is in communication with the sealed friction pair lubricating oil cavity.

8. The hydraulic brake according to claim 1, characterized in that: The oil seal installed on the housing has a dustproof lip.

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