Electromagnetic valve with tail end buffering function

Abstract

The utility model provides an electromagnetic valve with a tail end buffer. The electromagnetic valve with the tail end buffering function comprises a valve sleeve, a valve element arranged in the valve sleeve, a damping pin used for abutting against the valve element, an armature used for driving the damping pin to move, a pole pipe arranged around the damping pin and a buffering spring arranged around the damping pin, and the pole pipe is arranged in a hollow mode to form a containing cavity. An accommodating cavity is formed in the armature, the buffer spring is arranged in the accommodating cavity, the damping pin comprises a pin head and a pin rod, the pin head is positioned at one end close to the armature, a sealing disc is arranged in the accommodating cavity, and the buffer spring is propped between the pin head and the sealing disc. According to the electromagnetic valve with the tail end buffer, spring force is added in a large-current area to rebalance electromagnetic force, so that the performance PQ curve of the steep increasing part of the electromagnetic force in the large-current area can be perfectly within the technical specification range under the condition that the electromagnetic force is not changed in a low-current section.

Description

Technical Field

[0001] The utility model relates to a solenoid valve with end buffer. Background Art

[0002] In automobile transmissions, solenoid valves are widely used in various working conditions. In certain specific application conditions, it is necessary to enhance the electromagnetic force of the solenoid valve in order to better meet the requirements of the automobile's fast response and other performance. However, after increasing the electromagnetic force, the improvement effect is obvious in the low current segment; in the high current segment, due to the internal structure, the magnetic circuit will gradually close, and there will be a mutation segment, in which the electromagnetic force growth rate will be too large and often exceed the specification. In order to solve this problem, a new type of solenoid valve core technology was redesigned for the internal structure, which is the technology involved in this patent.

[0003] In a traditional solenoid valve, the electromagnetic head generates an electromagnetic force by forming a closed magnetic field after being energized, pushing the armature back and forth. However, due to the back and forth movement of the armature, the closed circuit changes. When the armature is about to reach the maximum designed stroke, the closed area of ​​the magnetic circuit increases, and the electromagnetic force increases rapidly.

[0004] Under market demand, stabilizing the electromagnetic force growth rate in high current and low current segments, so as to make the gearbox response more stable and comfortable, has become an urgent problem to be solved. The invention of this patent solves this problem, and its technical innovation and application value have been widely recognized.

[0005] The main parts of the solenoid valve and magnetic field on the market include coil, outer cover, flux tube, armature, pole tube and damping pin. When the electromagnetic head is energized, the internal coil generates a magnetic field, which passes through the outer cover-flux tube-armature-flux tube-pole tube in sequence to form a closed magnetic field loop. In this process, the armature moves in a limited space.

[0006] In most designs, the armature will be attracted to the pole tube by the electromagnetic force generated by the magnetic field, thereby driving the damping pin to move, thereby driving the hydraulic part to move. However, as the armature moves, the gap between it and the pole tube will also decrease, causing the magnetic flux area to gradually increase. When the magnetic flux area increases to a threshold, the electromagnetic force will increase sharply. This phenomenon often occurs in the high current area (greater than 1000ma).

[0007] The electromagnetic force is mainly balanced by the pressure at the hydraulic end and the force generated by the valve core (accounting for 90%), and the spring force at the hydraulic end (10%), which often show a linear growth. However, the sharp increase of electromagnetic force in the high current range causes the solenoid valve PQ performance curve (pressure-current) to easily exceed the range required by the technical specifications.

[0008] On the contrary, if the electromagnetic force during high current is balanced by reducing the hydraulic end force, the technical requirements will not be met in the low current range, resulting in a loss of one thing while gaining another.

[0009] In view of this, it is necessary to improve the existing solenoid valve to solve the above problems. Utility Model Content

[0010] The utility model aims to provide a solenoid valve with a terminal buffer to solve the problem that the PQ performance curve of the solenoid valve is very likely to exceed the range required by the technical specifications.

[0011] To achieve the above-mentioned purpose, the utility model provides a solenoid valve with end buffer, the solenoid valve with end buffer comprises a valve sleeve, a valve core arranged in the valve sleeve, a damping pin for abutting against the valve core, an armature for driving the damping pin to move, a pole tube arranged around the damping pin, and a buffer spring arranged around the damping pin, the pole tube is hollow to form a receiving cavity, the buffer spring is arranged in the receiving cavity, the damping pin comprises a pin head and a pin rod, the pin head is located at one end close to the armature, a sealing disk is arranged in the receiving cavity, and the buffer spring is abutted between the pin head and the sealing disk.

[0012] As a further improvement of the present invention, the pin head is provided with a supporting member facing the valve core for supporting the buffer spring.

[0013] As a further improvement of the present invention, the pole tube is provided with a limiter protruding toward the receiving cavity for abutting against the buffer spring.

[0014] As a further improvement of the present invention, the abutting member is provided with a clearance notch for making way for the limiting member, and the length of the abutting member along the axial direction of the pole tube is greater than the length of the limiting member along the axial direction of the pole tube.

[0015] As a further improvement of the present invention, the sealing disk includes an inner ring radially close to the pin rod, an outer ring radially away from the pin rod and abutting against the pole tube, and a bottom ring connecting the outer ring and the inner ring at one end away from the pin head, and the diameter of the inner ring is greater than the diameter of the pin rod.

[0016] As a further improvement of the present invention, the inner ring, the outer ring and the bottom ring are arranged to form a supporting portion with an opening facing the pin head, and the buffer spring protrudes into the supporting portion to abut against the sealing disk.

[0017] As a further improvement of the utility model, the solenoid valve with end buffer also includes a driving assembly for driving the armature to move axially, and the driving assembly includes a magnetic flux tube that surrounds the armature and is hollow, and an electromagnetic head arranged in the magnetic flux tube.

[0018] As a further improvement of the utility model, a magnetic isolation gasket is fixedly provided at the rear end of the magnetic flux tube, and a surface of the magnetic isolation gasket facing the inside of the armature is provided with a protrusion extending toward the armature, and the armature can slide between the position of contact and separation with the protrusion.

[0019] As a further improvement of the utility model, a spring seat is provided at one end of the valve sleeve away from the armature, a spring is provided inside the valve sleeve between the valve core and the spring seat, and two ends of the spring are elastically against the spring seat and the valve core respectively.

[0020] As a further improvement of the utility model, a plurality of flow openings are radially penetrated on the valve sleeve, and the valve core moves axially to open or close the flow openings.

[0021] The beneficial effect of the utility model is that the solenoid valve with end buffer of the utility model increases a spring force in the high current area to rebalance the electromagnetic force, so that the performance PQ curve of the part where the electromagnetic force increases sharply in the high current area can be perfectly within the technical specification range without changing the electromagnetic force in the low current section. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a solenoid valve with end buffer of the utility model;

[0023] Figure 2 It is a schematic cross-sectional structure diagram of the electromagnetic valve with end buffer of the utility model;

[0024] Figure 3 It is a partial structural schematic diagram of the electromagnetic valve with end buffer of the utility model;

[0025] Figure 4 It is a structural schematic diagram of the pole tube of the electromagnetic valve with end buffer of the utility model;

[0026] Figure 5 It is a structural schematic diagram of a damping pin of a solenoid valve with end buffer of the utility model;

[0027] Figure 6 It is a structural schematic diagram of a sealing disk of a solenoid valve with end buffer of the utility model. DETAILED DESCRIPTION

[0028] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0030] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. 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, the technical features involved in the different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0031] like Figures 1 to 6 As shown, the solenoid valve 100 with end buffer of the utility model includes a valve sleeve 1, a valve core 2 arranged in the valve sleeve 1, a damping pin 3 for abutting against the valve core 2, an armature 4 for driving the damping pin 3 to move, a pole tube 5 arranged around the damping pin 3, a buffer spring 6 arranged around the damping pin 3, and a driving component 7 for driving the armature 4 to move axially.

[0032] A spring seat 11 is arranged at one end of the valve sleeve 1 away from the armature 4, and a spring 12 is arranged inside the valve sleeve 1 between the valve core 2 and the spring seat 11, with two ends of the spring 12 elastically resisting against the spring seat 11 and the valve core 2 respectively.

[0033] The valve sleeve 1 is provided with a plurality of flow openings 13 in the radial direction, and the valve core 2 moves in the axial direction to open or close the flow openings 13. The flow openings 13 include control openings and inlet openings, which are arranged at intervals along the moving direction of the valve core 2.

[0034] The driving assembly 7 includes a magnetic flux tube 71 which surrounds the armature 4 and is hollow, and an electromagnetic head 72 which is arranged in the magnetic flux tube 71 .

[0035] A magnetic isolation gasket 73 is fixedly disposed at the rear end of the magnetic flux tube 71. A surface of the magnetic isolation gasket 73 facing the inside of the armature 4 is provided with a protrusion extending toward the armature 4. The armature 4 can slide between the position of contact with and separation from the protrusion.

[0036] The electromagnetic head 72 and the magnetic flux tube 71 generate electromagnetic force, and the armature 4 is attracted toward the pole tube 5 by the electromagnetic force, thereby driving the damping pin 3 to move, and further driving the valve core 2 to move.

[0037] The pole tube 5 is hollow to form a receiving cavity 51, the buffer spring 6 is arranged in the receiving cavity 51, the damping pin 3 includes a pin head 32 and a pin rod 31, the pin head 32 is located at one end close to the armature 4, a sealing disk 53 is arranged in the receiving cavity 51, and the buffer spring 6 is located between the pin head 32 and the sealing disk 53. The diameter of the pin head 32 is greater than the diameter of the pin rod 31, the pin rod 31 is inserted into the receiving cavity 51, and the pin head 32 is located outside the receiving cavity 51.

[0038] The pin head 32 is provided with a resisting member 321 toward the valve core 2 for resisting the buffer spring 6. The pole tube 5 is provided with a stopper 52 protruding toward the receiving cavity 51 for resisting the buffer spring 6. The resisting member 321 is provided with a clearance notch 322 for making way for the stopper 52, and the length of the resisting member 321 along the axial direction of the pole tube 5 is greater than the length of the stopper 52 along the axial direction of the pole tube 5. In this embodiment, the number of the clearance notches 322 is two, and the number of the stopper 52 is also two accordingly.

[0039] The sealing disk 53 includes an inner ring 531 radially close to the pin rod 31, an outer ring 532 radially away from the pin rod 31 and abutting against the pole tube 5, and a bottom ring connecting the outer ring 532 and the inner ring 531 at one end away from the pin head 32, and the diameter of the inner ring 531 is greater than the diameter of the pin rod 31.

[0040] The design of the sealing disk 53 mainly needs to meet the requirements of installing the buffer spring 6 and press-fitting it into the pole tube 5, ensuring that the press-fitting force is large enough so that the buffer spring 6 will not fall out during the back and forth movement, and the inner ring 531 needs to have a clearance fit with the pin rod 31 of the damping pin 3, which is sufficient to meet the back and forth movement requirements of the pin rod 31.

[0041] The inner ring 531, the outer ring 532 and the bottom ring are arranged to form a supporting portion with an opening facing the pin head 32, and the buffer spring 6 protrudes into the supporting portion to resist the sealing disk 53. The pin rod 31 passes through the inner ring 531 in the axial direction.

[0042] During operation, when the electromagnetic head 72 and the magnetic flux tube 71 generate electromagnetic force to move the damping pin 3 toward the valve core 2, the abutting member 321 passes through the clearance notch 322 and is inserted into the receiving chamber 51, and abuts against the buffer spring 6 to compress the buffer spring 6. The other end of the buffer spring 6 abuts against the sealing disk 53 and does not drive the sealing disk 53 to move. At this time, when the electromagnetic force increases sharply, the compression force of the buffer spring 6 rebalances the electromagnetic force. The length of the abutting member 321 depends on the total stroke of the damping pin 3 in the design, and the stroke that will cause the electromagnetic force to increase sharply. The design of the buffer spring 6 requires simulation fitting of the electromagnetic force increase section so that the corresponding pressure change can maintain a smooth transition. Because there is also a spring 12 at the tail of the hydraulic end, the superposition of the stiffness of the spring 12 needs to be considered when designing the buffer spring 6.

[0043] The solenoid valve 100 with end buffer of the utility model adds a spring force in the high current region to rebalance the electromagnetic force, so that the performance PQ curve of the part where the electromagnetic force increases sharply in the high current region can be perfectly within the technical specification range without changing the electromagnetic force in the low current section.

[0044] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0045] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A solenoid valve with end buffer, characterized in that: The solenoid valve (100) with end buffer comprises a valve sleeve (1), a valve core (2) arranged in the valve sleeve (1), a damping pin (3) for abutting against the valve core (2), an armature (4) for driving the damping pin (3) to move, a pole tube (5) arranged around the damping pin (3), and a buffer spring (6) arranged around the damping pin (3); the pole tube (5) is hollow to form a receiving cavity (51); the buffer spring (6) is arranged in the receiving cavity (51); the damping pin (3) comprises a pin head (32) and a pin rod (31); the pin head (32) is located at one end close to the armature (4); a sealing disk (53) is provided in the receiving cavity (51); and the buffer spring (6) is located between the pin head (32) and the sealing disk (53).

2. The solenoid valve with end buffer according to claim 1, characterized in that: The pin head (32) is provided with a supporting piece (321) facing the valve core (2) for supporting the buffer spring (6).

3. The solenoid valve with end buffer according to claim 2, characterized in that: The pole tube (5) is provided with a stopper (52) protruding toward the receiving cavity (51) and used for abutting against the buffer spring (6).

4. The solenoid valve with end buffer according to claim 3, characterized in that: The supporting member (321) is provided with a clearance notch (322) for making way for the limiting member (52), and the length of the supporting member (321) along the axial direction of the pole tube (5) is greater than the length of the limiting member (52) along the axial direction of the pole tube (5).

5. The solenoid valve with end buffer according to claim 1, characterized in that: The sealing disk (53) comprises an inner ring (531) radially close to the pin rod (31), an outer ring (532) radially away from the pin rod (31) and abutting against the pole tube (5), and a bottom ring connecting the outer ring (532) and an end of the inner ring (531) away from the pin head (32), wherein the diameter of the inner ring (531) is greater than the diameter of the pin rod (31).

6. The solenoid valve with end buffer according to claim 5, characterized in that: The inner ring (531), the outer ring (532) and the bottom ring are arranged to form a supporting portion with an opening facing the pin head (32), and the buffer spring (6) protrudes into the supporting portion to resist the sealing disk (53).

7. The solenoid valve with end buffer according to claim 1, characterized in that: The solenoid valve (100) with end buffer further comprises a driving assembly (7) for driving the armature (4) to move axially, the driving assembly (7) comprising a magnetic flux tube (71) surrounding the armature (4) and arranged hollow therein, and an electromagnetic head (72) arranged in the magnetic flux tube (71).

8. The solenoid valve with end buffer according to claim 7, characterized in that: A magnetic isolation gasket (73) is fixedly arranged at the rear end of the magnetic flux tube (71), and a protrusion extending toward the armature (4) is arranged on the surface of the magnetic isolation gasket (73) facing the inside of the armature (4), and the armature (4) can slide between the position of contact with and separation from the protrusion.

9. The solenoid valve with end buffer according to claim 1, characterized in that: A spring seat (11) is arranged at one end of the valve sleeve (1) away from the armature (4), and a spring (12) is arranged inside the valve sleeve (1) between the valve core (2) and the spring seat (11), with two ends of the spring (12) elastically abutting against the spring seat (11) and the valve core (2) respectively.

10. The solenoid valve with end buffer according to claim 1, characterized in that: The valve sleeve (1) is provided with a plurality of flow openings (13) extending radially therethrough, and the valve core (2) moves axially to open or close the flow openings (13).

Images