Yaw brake capable of preventing oil leakage

Abstract

The utility model relates to the technical field of yaw brakes, and provides an oil leakage prevention yaw brake which comprises a brake shell, a piston hole is formed in the brake shell, a piston body is installed in the piston hole, and a second seal and a main seal are installed on the inner wall of the piston hole in an embedded mode. At least one guide rod is arranged at the bottom of the piston hole, and the tail end of the piston body is inserted into the guide rod and connected with the guide rod in a sliding mode. The utility model can effectively reduce the piston deflection extrusion sealing element, and avoid the sealing element damage and oil leakage.

Description

Technical Field

[0001] The utility model relates to the technical field of yaw brakes, in particular to an oil leakage-proof yaw brake. Background Art

[0002] The yaw brake is used for braking and yaw of the wind turbine cabin. The yaw brake relies on hydraulic braking to act on the brake disc. The hydraulic yaw brake is usually in a pressure-maintaining working state, that is, it is in a braking state. From the normal pressure-maintaining braking state to the yaw state, the stroke of the piston in the piston hole of the shell is extremely short, and the seal between the piston and the cylinder can be approximately regarded as a static seal.

[0003] However, Figure 3 As shown, the sealing structure of the existing hydraulic yaw brake is relatively simple, and the sealing effect is not ideal. Especially at the moment of switching between yaw and brake, the brake disc generates a huge radial shear force on the piston through the friction plate, and the eccentric load causes the piston to sway laterally in the piston hole. The sway amplitude of the piston near the orifice is the largest, causing vibration of the seal and radial extrusion to varying degrees. At this time, the liquid pressure in the piston hole is at a peak state, which easily causes different degrees of wear and extrusion between the seal and the piston, thereby generating a gap and oil leakage. Utility Model Content

[0004] The utility model aims to provide an oil leakage-proof yaw brake capable of reducing the deflection of a seal and avoiding leakage of hydraulic oil caused by wear and extrusion of the seal.

[0005] The embodiment of the utility model is realized through the following technical scheme: an oil leakage-proof yaw brake, comprising a brake housing, the brake housing is provided with a piston hole, a piston body is installed in the piston hole, a second seal and a main seal are embedded and installed on the inner wall of the piston hole; at least one guide rod is provided at the bottom of the piston hole, and the tail end of the piston body is inserted into the guide rod and is slidably connected thereto.

[0006] Preferably, a friction plate is installed at one end of the brake housing, and the friction plate is located at the front end of the piston body; two guide rods are provided and are symmetrically arranged on both sides of the piston body, and the straight line direction of the two guide rods is consistent with the length direction of the friction plate.

[0007] Preferably, it further comprises a dust ring, wherein the dust ring is arranged on a side close to the piston hole, and the second seal is arranged between the dust ring and the main seal.

[0008] Preferably, the tail end of the second seal is provided with an anti-slip protrusion.

[0009] Preferably, the cross section of the second seal is a T-shaped structure.

[0010] Preferably, both ends of the piston body are provided with weight-reducing holes.

[0011] Preferably, the second seal is made of polyurethane material.

[0012] The technical solution of the embodiments of the utility model has at least the following advantages and beneficial effects: compared with the prior art, the utility model can bear part of the shear force by setting a guide rod for guidance, the seal will not be subjected to a large radial force, the fitting clearance between the piston body and the piston hole is also very small, the sealing extrusion clearance is small, and the seal is not easily extruded under the action of alternating pressure; the second seal and the main seal form a double sealing structure, which improves the sealing effect and avoids damage to the seal and oil leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 A schematic structural diagram of an oil leakage-proof yaw brake provided in an embodiment of the utility model;

[0015] Figure 2 for Figure 1 A local enlarged view of point A in FIG.

[0016] Figure 3 The figure is a schematic diagram of the structure of an existing yaw brake when in use.

[0017] Icons: 1-brake housing, 2-piston hole, 3-piston body, 4-guide rod, 5-dust ring, 6-second seal, 61-anti-drop protrusion, 7-main seal, 8-weight reduction hole, 9-friction plate, 10-brake disc. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0019] 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 present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] 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, further definition and explanation thereof is not required in subsequent drawings.

[0021] Example

[0022] The following is further described in conjunction with specific embodiments. Figure 1-Figure 3 As shown, the present embodiment is an oil-leakage-proof yaw brake, comprising a brake housing 1, the brake housing 1 being provided with a piston hole 2, a piston body 3 being installed in the piston hole 2, a second seal 6 and a main seal 7 being embedded and installed on the inner wall of the piston hole 2; at least one guide rod 4 being provided at the bottom of the piston hole 2, the tail end of the piston body 3 being inserted into the guide rod 4 and being slidably connected therewith; specifically, when the force exerted on the friction plate 9 is transmitted to the piston body 3, since the utility model inserts the guide rod 4 into the piston body 3, the front end deflection of the piston body 3 is relatively larger, and the additional second seal 6 reduces the gap between the piston body 3 and the piston hole 2, which helps to reduce the front end deflection, and at the same time the guide rod 4 can bear a part of the shear force, which reduces the tail end deflection, thereby preventing the piston body 3 from squeezing the main seal 7, and forming a double seal structure in cooperation with the main seal 7 and the second seal 6, thereby avoiding oil leakage due to seal wear.

[0023] Reference Figure 1 As shown, a friction plate 9 is installed at one end of the brake housing 1 in this embodiment, and the friction plate 9 is located at the front end of the piston body 3; two guide rods 4 are provided and are symmetrically arranged on both sides of the piston body 3, and the straight line direction of the two guide rods 4 is consistent with the length direction of the friction plate 9; specifically, in order to adapt to the shear force directions of the piston body 3 being opposite when the yaw brake is rotated forward and reverse, the guide rods 4 are equidistantly arranged on both sides of the piston body 3 to effectively bear most of the shear force.

[0024] The present embodiment further comprises a dust ring 5, which is arranged on a side close to the piston hole 2, and a second seal 6 is arranged between the dust ring 5 and the main seal 7. The dust ring 5 is arranged to prevent dust and impurities from entering the piston hole 2 to affect the smooth movement of the piston body 3, and even affect the normal braking performance of the brake.

[0025] like Figure 2As shown, in order to improve the anti-slip ability of the second seal 6, an anti-slip protrusion 61 is provided at the tail end of the second seal 6; specifically, when the second seal 6 is squeezed by the piston body 3, the second seal 6 is not easy to slip out due to its long length embedded in the piston hole 2, thereby having a better sealing and leak-proof effect.

[0026] It is worth noting that the cross section of the second seal 6 is a T-shaped structure, and may also be a round head shape.

[0027] In order to reduce the weight of the piston body 3, weight reduction holes 8 are opened at both ends of the piston body 3, and the end surface facing the friction disk can reduce the contact area, thereby reducing the impact of the shear direction of the friction disk on the piston body 3.

[0028] In addition, the second seal 6 is made of polyurethane material, which has strong wear resistance, and the polyurethane sealing ring can withstand greater pressure and friction, is not easily affected by wear, and is suitable for high-pressure working environments; at the same time, the sealing performance is good, and the polyurethane sealing ring can effectively prevent liquid or gas leakage. The polyurethane sealing ring can be used for a long time in environments such as grease, hydraulic oil, etc. without being affected.

[0029] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An oil leakage-proof yaw brake, comprising a brake housing (1), wherein the brake housing (1) is provided with a piston hole (2), wherein a piston body (3) is installed in the piston hole (2), and characterized in that: A second seal (6) and a main seal (7) are embedded and installed on the inner wall of the piston hole (2); At least one guide rod (4) is provided at the bottom of the piston hole (2), and the rear end of the piston body (3) is inserted into the guide rod (4) and is slidably connected thereto.

2. The oil leakage-proof yaw brake according to claim 1, characterized in that: A friction plate (9) is installed at one end of the brake housing (1), and the friction plate (9) is located at the front end of the piston body (3); Two guide rods (4) are provided and are symmetrically arranged on both sides of the piston body (3), and the straight line direction of the two guide rods (4) is consistent with the length direction of the friction plate (9).

3. The oil leakage-proof yaw brake according to claim 2, characterized in that: It also includes a dust ring (5), which is arranged on a side close to the piston hole (2), and the second seal (6) is arranged between the dust ring (5) and the main seal (7).

4. The oil leakage-proof yaw brake according to claim 1, characterized in that: The tail end of the second seal (6) is provided with an anti-drop protrusion (61).

5. The oil leakage-proof yaw brake according to claim 4, characterized in that: The cross section of the second seal (6) is a T-shaped structure.

6. The oil leakage-proof yaw brake according to claim 1, characterized in that: Both ends of the piston body (3) are provided with weight-reducing holes (8).

7. The oil leakage-proof yaw brake according to claim 1, characterized in that: The second seal (6) is made of polyurethane material.

Images