High-pressure automatic variable control valve of motor

Abstract

The utility model discloses a high-pressure automatic variable control valve of a motor, which comprises a valve body, a valve sleeve is arranged in the valve body, a servo pressure oil way and a motor variable cylinder on-off oil way are arranged between the valve body and the valve sleeve, a valve core is arranged in the valve sleeve, one end of the valve core is provided with a pilot pressure oil way, and the pilot pressure oil way is arranged in the direction that the pilot pressure oil way provides pushing force for the valve core. The valve element sequentially comprises a first shaft, a second shaft and a third shaft, the diameter of the first shaft and the diameter of the third shaft are both smaller than the diameter of the second shaft, and an annular protrusion is arranged on the third shaft. A first annular groove is formed in the connecting position of the first shaft and the second shaft, the servo pressure oil way is communicated with the first annular groove, a second annular groove is formed between the annular protrusion and the second shaft, and the motor variable cylinder on-off oil way is blocked by the annular protrusion to form two parts. The utility model has the advantage that faults are not easy to occur.

Description

Technical Field

[0001] This utility model relates to a high-pressure automatic variable control valve for motors. Background Technology

[0002] The structure of an existing high-pressure automatic variable valve for motors (hereinafter referred to as the control valve) is as follows: Figure 3 and Figure 4 As shown, the device includes a valve body, a valve sleeve inside the valve body, a servo pressure oil circuit and a motor variable cylinder on / off oil circuit between the valve body and the valve sleeve, a valve core inside the valve sleeve, a pilot pressure oil circuit at one end of the valve core, and a pre-compressed spring at the other end of the valve core. Figure 3 (Omitted). When the pilot oil is not involved, as the pressure in the servo pressure oil circuit increases, the servo pressure oil overcomes the spring preload and pushes the valve core, causing the motor variable cylinder on / off oil circuit to change from disconnected to open. High-pressure oil enters the motor variable cylinder, the motor changes direction, and the pressure in the servo pressure oil circuit decreases accordingly. Under the spring preload, the valve core returns to its original position, and the motor variable cylinder on / off oil circuit is disconnected again. However, during use, it was found that because the motor variable cylinder on / off oil circuit is connected to the servo pressure oil circuit when it is open (part of the motor variable cylinder on / off oil circuit overlaps with part of the servo pressure oil circuit), the servo pressure is greatly affected by the flow fluctuations in the "open-close" dynamic balance of the motor variable cylinder on / off oil circuit, which makes the motor prone to pressure swings, pressure steps, and other faults during the variable process. Utility Model Content

[0003] The purpose of this invention is to provide a high-pressure automatic variable valve for motors. This invention has the advantage of being less prone to failure.

[0004] The technical solution of this utility model is as follows: A high-pressure automatic variable control valve for a motor includes a valve body, a valve sleeve inside the valve body, a servo pressure oil circuit and a motor variable cylinder on / off oil circuit between the valve body and the valve sleeve, a valve core inside the valve sleeve, a pilot pressure oil circuit at one end of the valve core, and in the direction in which the pilot pressure oil circuit provides a pushing force to the valve core, the valve core sequentially includes a first shaft, a second shaft and a third shaft, the diameters of the first shaft and the third shaft are both smaller than the diameter of the second shaft, the first shaft and the second shaft are both attached to the inner wall of the valve sleeve and achieve axial sliding connection, the third shaft is provided with an annular protrusion, the annular protrusion is attached to the inner wall of the valve sleeve and achieves axial sliding connection;

[0005] A first annular groove is provided at the connection between the first and second axes, and the servo pressure oil circuit is connected to the first annular groove.

[0006] A second annular groove is formed between the annular protrusion and the second shaft. The oil circuit of the motor variable cylinder is blocked by the annular protrusion and forms two parts. The end of one part is connected to the second annular groove, and the end of the other part is located on the radial side of the annular protrusion or on the side of the annular protrusion away from the first shaft.

[0007] The motor high-pressure automatic variable control valve has a cavity connected with the pilot pressure oil path between the valve body and the valve sleeve, and the first shaft has one end extending into the cavity and a stop ring.

[0008] The motor high-pressure automatic variable control valve has a plurality of annular grooves on the outer periphery of the first shaft and the outer periphery of the second shaft, and the cross section of the annular grooves is V-shaped.

[0009] The motor high-pressure automatic variable control valve has a diameter of 7 mm for the first shaft, a diameter of 7.2 mm for the second shaft, and a diameter of 7.2 mm for the annular protrusion.

[0010] Compared with the prior art, the motor variable cylinder on-off oil path and the servo pressure oil path are independent oil paths, regardless of the change of the valve core position, the motor variable cylinder on-off oil path and the servo pressure oil path are not connected, thereby the servo pressure is not affected by the flow fluctuation in the dynamic balance of the "opening-closing" of the motor variable cylinder on-off oil path, so that the motor is not prone to pressure swing, pressure step and other faults during the variable process. Therefore, the utility model has the advantages of not prone to faults. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the utility model.

[0012] Figure 2 It is a hydraulic principle diagram of the utility model.

[0013] Figure 3 It is a structural schematic diagram of the prior control valve.

[0014] Figure 4 It is a hydraulic principle diagram of the prior control valve.

[0015] The marks in the drawings are: 1-valve body, 2-valve sleeve, 3-servo pressure oil path, 4-motor variable cylinder on-off oil path, 5-valve core, 6-pilot pressure oil path, 7-first shaft, 8-second shaft, 9-third shaft, 10-annular protrusion, 11-first annular groove, 12-second annular groove, 13-annular groove, 14-cavity, 15-stop ring. DETAILED DESCRIPTION

[0016] The utility model will be further described below in combination with the drawings and examples, but it is not as the basis for limiting the utility model.

[0017] Example. A motor high-pressure automatic variable control valve, such as Figure 1 and Figure 2As shown, including the valve body 1, the valve body 1 is provided with a valve sleeve 2, the valve body 1 and the valve sleeve 2 are provided with servo pressure oil circuit 3 and motor variable cylinder on-off oil circuit 4, the valve sleeve 2 is provided with valve core 5, one end of the valve core 5 is provided with pilot pressure oil circuit 6, one end of the valve core 5 is provided with pre-pressing spring. Figure 1 In the spring, Figure 1 The upper end of the spring acts on the valve core 5, and the lower end is connected to the valve sleeve 2 or the adjacent part after the control valve is installed, and the characteristics are as follows:

[0018] In the direction of the pilot pressure oil circuit 6 giving the valve core 5 a pushing force, the valve core 5 successively includes a first shaft 7, a second shaft 8 and a third shaft 9, the diameters of the first shaft 7 and the third shaft 9 are both smaller than the diameter of the second shaft 8, the first shaft 7 and the second shaft 8 are both in contact with the inner wall of the valve sleeve 2 and realize axial sliding connection, the third shaft 9 is provided with an annular protrusion 10, and the annular protrusion 10 is in contact with the inner wall of the valve sleeve 2 and realizes axial sliding connection.

[0019] The connection between the first shaft 7 and the second shaft 8 is provided with a first annular groove 11, and the servo pressure oil circuit 3 passes through the first annular groove 11 and maintains a communication state with the first annular groove 11.

[0020] The second annular groove 12 is formed between the annular protrusion 10 and the second shaft 8, the motor variable cylinder on-off oil circuit 4 passes between the valve sleeve 2 and the valve core 5, and is blocked by the annular protrusion 10 to form two parts, one end of one part communicates with the second annular groove 12, and the other end of the other part is located on the radial side of the annular protrusion 10 or the side away from the first shaft 7 of the annular protrusion 10.

[0021] The valve body 1 and the valve sleeve 2 are provided with a cavity 14 connected with the pilot pressure oil circuit 6, the cavity 14 is cylindrical, one end of the first shaft 7 extends into the cavity and is provided with a stop ring 15 for limiting the axial movement range of the valve core 5.

[0022] The outer periphery of the first shaft 7 and the outer periphery of the second shaft 8 are both provided with a plurality of annular grooves 13, the depth of the annular groove 13 is 0.25mm, and the cross section of the annular groove 13 is V-shaped.

[0023] The diameter of the first shaft 7 is 7mm, the diameter of the second shaft 8 is 7.2mm, and the diameter of the annular protrusion 10 is 7.2mm.

[0024] Working principle: as Figure 1As shown, when the oil pressure of the servo pressure oil way 3 rises, because the diameter of the first shaft 7 is smaller than the diameter of the second shaft 8, the end surface area of the lower side of the first annular groove 11 is larger than that of the upper side, a pressure difference exists, so that the valve core 6 moves downward, the second annular groove 12 moves downward correspondingly, the two parts of the motor variable cylinder on-off oil way 4 are communicated, the motor variable cylinder on-off oil way 4 is in an open state, high-pressure oil enters the motor variable cylinder, the motor variable cylinder, the pressure of the servo pressure oil way 3 is reduced correspondingly, under the pre-tightening force of the spring, the valve core 5 rises, and the motor variable cylinder on-off oil way 4 is disconnected again.

[0025] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc. indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the present application.

Claims

1. A high-pressure automatic variable control valve for a motor, comprising a valve body (1), a valve sleeve (2) provided inside the valve body (1), a servo pressure oil circuit (3) and a motor variable cylinder on / off oil circuit (4) provided between the valve body (1) and the valve sleeve (2), a valve core (5) provided inside the valve sleeve (2), and a pilot pressure oil circuit (6) provided at one end of the valve core (5), characterized in that: In the direction in which the pilot pressure oil circuit (6) gives the valve core (5) a pushing force, the valve core (5) includes a first shaft (7), a second shaft (8) and a third shaft (9) in sequence. The diameter of the first shaft (7) and the diameter of the third shaft (9) are both smaller than the diameter of the second shaft (8). The first shaft (7) and the second shaft (8) are both attached to the inner wall of the valve sleeve (2) and achieve axial sliding connection. The third shaft (9) is provided with an annular protrusion (10). The annular protrusion (10) is attached to the inner wall of the valve sleeve (2) and achieves axial sliding connection. A first annular groove (11) is provided at the connection between the first shaft (7) and the second shaft (8), and the servo pressure oil circuit (3) is connected to the first annular groove (11). A second annular groove (12) is formed between the annular protrusion (10) and the second shaft (8). The oil circuit (4) of the motor variable cylinder is blocked by the annular protrusion (10) and forms two parts. The end of one part is connected to the second annular groove (12), and the end of the other part is located on the radial side of the annular protrusion (10) or on the side of the annular protrusion (10) away from the first shaft (7).

2. The high-pressure automatic variable valve for motors according to claim 1, characterized in that: The valve body (1) and the valve sleeve (2) are provided with a cavity (14) that is connected to the pilot pressure oil circuit (6). One end of the first shaft (7) extends into the cavity and is provided with a retaining ring (15) for limiting.

3. The high-pressure automatic variable valve for motors according to claim 1, characterized in that: Multiple annular grooves (13) are provided on the outer circumferential surface of the first shaft (7) and the outer circumferential surface of the second shaft (8), and the cross-section of the annular grooves (13) is V-shaped.

4. The high-pressure automatic variable valve for motors according to claim 1, characterized in that: The diameter of the first shaft (7) is 7 mm, the diameter of the second shaft (8) is 7.2 mm, and the diameter of the annular protrusion (10) is 7.2 mm.

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