Mounting structure for valve element and adjusting mechanism of hydraulic valve

Abstract

The utility model provides a mounting structure for a valve core and an adjusting mechanism of a hydraulic valve, which comprises a valve body, a valve hole is arranged on the valve body, the valve core is arranged in the valve hole in a sliding manner, a mounting hole is arranged at an orifice of the valve hole, and the adjusting mechanism is arranged in the mounting hole. The adjusting mechanism comprises a top seat, a spring and an adjusting ejector rod, the top seat and the spring are mounted in the mounting hole, and the spring pushes the top seat towards the valve element; a ball hole is formed in the end face, close to one side of the valve element, of the top seat, a ball is installed in the ball hole and attached to the end face, close to the top seat side, of the valve element, and the top seat and the valve element are in contact through the ball, so that the stress environment of the end face of the valve element is improved, adverse external force such as lateral pushing and pressing on the valve element is avoided, and the service life of the valve element is prolonged. The occurrence of clamping stagnation of the valve core is reduced, the action sensitivity of the valve core is improved, the reaction time is shortened, and the problems of short service life and the like caused by eccentric wear of the valve core are also avoided.

Description

Technical Field

[0001] The utility model relates to the hydraulic field, in particular to an installation structure of a valve core and an adjusting mechanism of a hydraulic valve. Background Art

[0002] The hydraulic pump is the core component of the hydraulic system and provides power source for the hydraulic system. The main pump of the existing excavator is mainly an electric K3V hydraulic pump. During use, when the load demand is large, the inclination angle of the hydraulic pump swash plate is at a larger angle, so that the displacement of the hydraulic pump is in a larger state. When the load demand is small, the inclination angle of the hydraulic pump swash plate is at a smaller angle, reducing the displacement of the hydraulic pump and reducing energy loss.

[0003] The existing K3V hydraulic pump controls the inclination angle of the swash plate through a load-sensitive valve to control the flow of the hydraulic pump. Therefore, the control response speed and reliability of the load-sensitive valve directly affect the adjustment characteristics and energy-saving performance of the hydraulic pump. The existing load-sensitive valve slide valve structure uses spring adjustment and reset. Due to the deflection of the spiral spring force and the surface contact of the action surface, the valve core moves slowly or even gets stuck, and there are problems such as slow response speed and delayed regulation. Utility Model Content

[0004] The technical problem to be solved by the utility model is that the existing load control valve has slow movement of the valve core, slow response speed, easy eccentric wear of the valve core and low reliability. The utility model provides an installation structure of the valve core and the regulating mechanism of a hydraulic valve to solve the above problems.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a mounting structure of a valve core and an adjusting mechanism of a hydraulic valve, comprising a valve body, a valve hole being arranged on the valve body, a valve core being slidably arranged in the valve hole, a mounting hole being arranged at the orifice of the valve hole, and an adjusting mechanism being arranged in the mounting hole; the adjusting mechanism comprises a top seat, a spring and an adjusting push rod, the top seat and the spring being mounted in the mounting hole and the spring pushing the top seat toward the valve core; a ball hole being arranged on the top seat at the end face near one side of the valve core, a ball being mounted in the ball hole, and the ball being fitted on the end face of the valve core near the top seat.

[0006] Furthermore: a mounting thread is provided at the opening of the mounting hole, and an external thread screwed onto the mounting thread is provided on the outer wall of the adjusting push rod; an inner hexagonal hole is provided on the outer end surface of the adjusting push rod, and a positioning step is provided on the inner end surface, and the spring is sleeved on the outside of the positioning step.

[0007] Furthermore: a leakage oil passage is provided on the valve body, and the leakage oil passage is communicated with the mounting hole.

[0008] The beneficial effect of the utility model is that the installation structure of the valve core and the adjustment mechanism of a hydraulic valve of the present application is in contact between the top seat and the valve core through the ball, which improves the force environment of the valve core end face and avoids the generation of adverse external forces such as lateral pushing on the valve core, reduces the occurrence of valve core sticking, improves the sensitivity of the valve core movement, shortens the reaction time, and also avoids problems such as short life caused by eccentric wear of the valve core. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0010] Figure 1 The utility model is a structural schematic diagram of the installation structure of a valve core and an adjusting mechanism of a hydraulic valve.

[0011] In the figure, 1, valve body, 2, valve hole, 3, valve core, 4, mounting hole, 5, top seat, 6, spring, 7, adjusting push rod, 8, ball hole, 9, ball, 10, mounting thread, 11, external thread, 12, hexagonal hole, 13, positioning step, and 14, leakage oil channel. DETAILED DESCRIPTION

[0012] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. On the contrary, the embodiments of the present invention include all changes, modifications and equivalents that fall within the spirit and connotation of the appended claims.

[0013] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0014] In addition, the terms "first", "second", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance. In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, in the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0015] Any process or method description in the flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present invention belong.

[0016] like Figure 1 As shown, the utility model provides an installation structure of a valve core 3 and an adjusting mechanism of a hydraulic valve, comprising a valve body 1, a valve hole 2 is provided on the valve body 1, a valve core 3 is slidably provided in the valve hole 2, a mounting hole 4 is provided at the orifice of the valve hole 2, and an adjusting mechanism is provided in the mounting hole 4; the adjusting mechanism comprises a top seat 5, a spring 6 and an adjusting push rod 7, the top seat 5 and the spring 6 are installed in the mounting hole 4 and the spring 6 pushes the top seat 5 toward the valve core 3; on the top seat 5, a ball hole 8 is provided at the end surface near one side of the valve core 3, a ball 9 is installed in the ball hole 8, and the ball 9 is attached to the end surface of the valve core 3 near the top seat 5 side.

[0017] The valve core 3 in the valve body 1 slides in the valve hole 2, so that different on-off states of the oil circuit on the valve body 1 can be switched. The top seat 5 is pushed and fitted onto the end face of the valve core 3 by the spring 6 of the adjustment mechanism, which can generate positive pressure on the end face of the valve core 3. The pushing action of the top seat 5 on the end face of the valve core 3 is used to jointly control the sliding state of the valve core 3 together with other forces acting on the end face of the valve core 3.

[0018] In the present application, the end face of the top seat 5 and the end face of the valve core 3 are not fitted together in the way of end face and end face fitting in the prior art, but a ball 9 is installed on the end face of the top seat 5, and the ball 9 is fitted on the end face of the valve core 3, and the end face of the valve core 3 is pushed by the ball 9.

[0019] On the one hand, after the original end-face-to-end-face fit is changed to the spherical-face-to-end-face fit, when the spring 6 applies thrust to the tilted top seat 5, it will not directly act on the valve core 3, but will always maintain positive pressure on the end face of the valve core 3 through the follow-up adjustment ability of the ball 9, thereby avoiding the generation of adverse external forces such as lateral push on the valve core 3, reducing the occurrence of valve core 3 jamming, improving the sensitivity of the valve core 3, shortening the reaction time, and also avoiding the problem of short life caused by eccentric wear of the valve core 3.

[0020] On the other hand, the ball 9 can roll freely on the end face of the valve core 3 and adjust its position adaptively, which can eliminate some assembly or manufacturing errors. Even if there is a small amount of misalignment between the center of the valve core 3 and the center of the adjustment mechanism, it will not affect the normal operation and working performance of the valve core 3.

[0021] Through the above modification, the common problems in the existing spring 6 structure adjustment mechanism, such as eccentric wear of the valve core 3, stagnation of the valve core 3 movement, slow response caused by the valve core 3 pushing out of the same axis, and even the valve core 3 being stuck in the valve hole 2, are overcome. The force environment of the valve core 3 is improved, adverse external forces are avoided, the response time of the valve core 3 is shortened, and the operating life of the hydraulic system is extended.

[0022] A mounting thread 10 is provided at the opening of the mounting hole 4, and an external thread 11 screwed onto the mounting thread 10 is provided on the outer wall of the adjusting push rod 7; an inner hexagonal hole 12 is provided on the outer end surface of the adjusting push rod 7, and a positioning step 13 is provided on the inner end surface thereof, and the spring 6 is sleeved on the outside of the positioning step 13.

[0023] By turning the hexagonal hole 12, the push rod 7 can be screwed and adjusted, so that the pre-tightening force of the push rod 7 on the spring 6 can be adjusted to adjust the control state of the valve core 3. The positioning step 13 can be engaged with the inner ring of the spring 6, which plays a preliminary guiding and positioning role for the spring 6, ensuring that the spring 6 can be compressed and expanded in a vertical state, avoiding abnormalities such as compression deviation and deflection, and improving the reliability of the hydraulic valve.

[0024] The valve body 1 is provided with a leakage oil passage 14, and the leakage oil passage 14 is connected with the mounting hole 4. The valve core 3 and the valve hole 2 are a clearance-sealed sliding valve type sealing structure. Under such a sealing method, slightly leaked oil will gradually accumulate in the mounting hole 4, and the oil pressure there will gradually rise to the same as the working pressure when it cannot flow out. The leakage oil passage 14 provided in the present application can discharge slightly leaked oil in time, avoid the pressurized oil in the mounting hole 4 from exerting force on the end face of the valve core 3, and avoid affecting the sliding control state of the valve core 3. This structure improves the accuracy of the control of the valve core 3.

[0025] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0026] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A mounting structure of a valve core (3) and an adjusting mechanism of a hydraulic valve, characterized in that: The valve body (1) comprises a valve body (1), a valve hole (2) is arranged on the valve body (1), a valve core (3) is slidably arranged in the valve hole (2), a mounting hole (4) is arranged at the orifice of the valve hole (2), and an adjustment mechanism is arranged in the mounting hole (4); The regulating mechanism comprises a top seat (5), a spring (6) and an regulating push rod (7); the top seat (5) and the spring (6) are installed in the installation hole (4), and the spring (6) pushes the top seat (5) toward the valve core (3); A ball hole (8) is provided on the top seat (5) at the end surface near the valve core (3), a ball (9) is installed in the ball hole (8), and the ball (9) is attached to the end surface of the valve core (3) near the top seat (5).

2. The installation structure of the valve core (3) and the regulating mechanism of a hydraulic valve according to claim 1, characterized in that: The mounting hole (4) is provided with a mounting thread (10) at its opening, and the outer wall of the adjusting push rod (7) is provided with an external thread (11) screwed onto the mounting thread (10); the outer end surface of the adjusting push rod (7) is provided with a hexagonal hole (12), and the inner end surface thereof is provided with a positioning step (13), and the spring (6) is sleeved on the outside of the positioning step (13).

3. The installation structure of the valve core (3) and the regulating mechanism of a hydraulic valve according to claim 2, characterized in that: The valve body (1) is provided with a leakage oil passage (14), and the leakage oil passage (14) is in communication with the mounting hole (4).

Images