Built-in altitude valve piston

Abstract

The utility model discloses a built-in height valve piston which comprises a piston (1), a base (2) and a sliding sleeve (3), the piston (1) is tubular, the base (2) is embedded in one end of a center hole of the piston (1), the inner end of the sliding sleeve (3) penetrates through the base (2) and is embedded in the piston (1), a plurality of first strip-shaped protruding strips (4) are distributed on the inner wall of one end, where the base (2) is installed, of the piston (1) at intervals, and the first strip-shaped protruding strips (4) are embedded in the sliding sleeve (3). A plurality of second strip-shaped raised lines (10) which are distributed at intervals are arranged on two side walls of the annular groove (5); protruding blocks (11) are arranged on the end faces of several of all the first strip-shaped protruding strips (4) on the piston (1), and positioning pieces (12) are arranged in the annular grooves (5). According to the piston, the convex blocks are additionally arranged on several of the first strip-shaped convex strips, so that ejection demolding is uniform, post-shrinkage is reduced, a positioning structure is additionally arranged at the other end, and the circumferential position is positioned during assembly.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile parts, and specifically relates to a built-in height valve piston. BACKGROUND

[0002] The built-in height valve piston is a key component in the height valve, mainly applied to vehicle suspension systems with air springs (air bags), including but not limited to EMUs, subway vehicles, buses, long-distance buses, heavy trucks, and some high-end cars. As long as air springs are used to achieve suspension function and precise control of vehicle height is required, the built-in height valve piston is indispensable. It is usually located inside the height valve and works in coordination with components such as levers, eccentric pins, and piston rods. In mechanical height valves, it is assembled inside the valve body, with one side connected to the lever system that can sense changes in vehicle height and the other side cooperating with air inlet and exhaust valves to control the entry and exit of air.

[0003] The function of the built-in height valve piston is to adjust the height: by controlling the inflation and deflation of the air spring, the vehicle can automatically maintain the set height when the load changes, ensuring the stability and safety of vehicle driving, such as avoiding vehicle body tilting and uncoupling of the coupling device caused by uneven passenger distribution and different vehicle loads in EMUs and subway vehicles. Improve comfort: adjust the height in real time according to the actual situation of the vehicle, reduce the vibration and jolt of the vehicle body, and provide a more comfortable riding experience for the driver and passengers. Protect the road surface: prevent excessive impact of the vehicle wheels on the road surface due to changes in load, thereby protecting the road surface from excessive damage.

[0004] A built-in height valve piston in the prior art includes a piston, a base, and a sliding sleeve. The piston is tubular, the base is embedded in one end of the central hole of the piston, and the inner end of the sliding sleeve is embedded in the piston through the base. The inner wall of the end of the piston where the base is installed is provided with a plurality of first strip-shaped protrusions distributed at intervals, each protrusion extending to the middle of the inner wall of the piston. The end face of the other end of the piston is provided with an annular groove, the axis of the annular groove and the axis of the piston are on the same straight line, the annular groove is provided with a first mounting hole, a second mounting hole, and a third mounting hole, and the first mounting hole is provided with an electromagnetic valve. The two side walls of the annular groove are provided with a plurality of second strip-shaped protrusions distributed at intervals. This structure has two shortcomings: 1. The first strip-shaped protrusions are narrow in width, uneven in wall thickness, and made of PA66+GF30 with high glass fiber content, which is prone to mold sticking and water absorption deformation. 2. The end of the end with the second strip-shaped protrusions cannot be accurately limited in the circumferential direction during assembly, resulting in errors in the circumferential installation position and affecting the assembly of the entire product. SUMMARY

[0005] The utility model wants to solve the technical problem, provide a kind of in several of the first strip convex strip increase boss, to make ejection uniform, reduce post-shrinkage, still increase positioning structure at another end, the circumferential position is positioned when assembling the built-in height valve piston.

[0006] The utility model discloses a technical scheme, provide a kind of built-in height valve piston with following structure, including piston, base and sliding sleeve, the piston is tubular type, the base is embedded in the center hole one end of piston, the inner end of the sliding sleeve is embedded in the piston through base, the inner wall of the one end of the piston where installing base is equipped with several first strip convex strips distributed at intervals, each convex strip extends to the middle part of the inner wall of piston, the end face of the other end of the piston is equipped with annular groove, the axis of the annular groove and the axis of the piston are on the same straight line, the first installation hole, the second installation hole and the third installation hole are equipped in the annular groove, the electromagnetic valve is equipped in the first installation hole;Two side walls of the annular groove are equipped with several second strip convex strips distributed at intervals;It is characterized in that: the end face of several of all first strip convex strips on the piston is equipped with boss, the positioning sheet is equipped in the annular groove.

[0007] The end of at least interval first strip convex strip is equipped with boss, the end of first strip convex strip after increasing boss is located in the center of piston.

[0008] The boss is cylindrical, and is integrally formed with the first strip convex strip at the position.

[0009] The positioning sheet is T-shaped structure and includes first connecting plate and second connecting plate, the first connecting plate and the second connecting plate are distributed along the axis of the piston, the inner side of the first connecting plate is fixed with the inner side wall of the annular groove, and the outer side is fixed with the second connecting plate, and the second connecting plate is located between adjacent second strip convex strips.

[0010] The second connecting plate is located between two second strip convex strips, and a spacing is arranged between the two.

[0011] The first connecting plate and the second connecting plate are located in the cavity between the second installation hole and the third installation hole.

[0012] The axis of the boss is parallel to the axis of the piston, and is laid on the end face of the first strip convex strip, the diameter of the boss is greater than the thickness of the first strip convex strip, and less than the length of the first strip convex strip.

[0013] With the above structure, the piston has the following advantages: 1. Since the end faces of some of the first strip-shaped protrusions on the piston are provided with protrusions, that is, the cylindrical structure is increased, the ejection demolding is uniform, the post-shrinkage is reduced, and the product assembly size is stable. 2. Since the positioning piece is arranged in the annular groove, the anti-error limiting device can be used during assembly, and if the position is not correct, the positioning piece cannot be embedded, and the positioning piece can only be installed at the correct circumferential position, thereby effectively solving the possibility of error. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a perspective view of one end of the built-in height valve piston of the utility model.

[0015] Figure 2 It is a perspective view of the other end of the built-in height valve piston of the utility model.

[0016] Figure 3 It is a perspective view of the built-in height valve piston of the utility model.

[0017] Figure 4 It is a top view of one end of the piston of the utility model.

[0018] Figure 5 It is a top view of the other end of the piston of the utility model.

[0019] Figure 6 It is a perspective view of one end of the piston of the utility model.

[0020] Figure 7 It is a perspective view of the other end of the piston of the utility model.

[0021] In the drawings:

[0022] 1, piston, 2, base, 3, sliding sleeve, 4, protrusion, 5, annular groove, 6, first mounting hole, 7, second mounting hole, 8, third mounting hole, 9, electromagnetic valve, 10, second strip-shaped protrusion, 11, protrusion, 12, positioning piece, 13, first connecting plate, 14, second connecting plate. DETAILED DESCRIPTION

[0023] The utility model will be further described below in combination with the drawings.

[0024] As Figures 1-7 shown, the utility model discloses a built-in height valve piston, which comprises a piston 1, a base 2 and a sliding sleeve 3, the piston 1 is tubular, the base 2 is embedded in one end of the central hole of the piston 1, and the inner end of the sliding sleeve 3 is embedded in the piston 1 by penetrating the base 2.

[0025] As Figure 3 , Figure 4And Figure 7 As shown in the figure, the inner wall of the one end of the base 2 mounted on the piston 1 is provided with a plurality of first strip-shaped ribs 4 distributed at intervals, which act as reinforcing ribs of the piston side wall and increase the strength of the piston. Each rib 4 extends to the middle of the inner wall of the piston 1.

[0026] The end face of the other end of the piston 1 is provided with an annular groove 5, which is axially concave and the opening faces the outer end. The axis of the annular groove 5 is on the same straight line as the axis of the piston 1, and the annular groove 5 is provided with a first mounting hole 6, a second mounting hole 7 and a third mounting hole 8, and the first mounting hole 6 is provided with a solenoid valve 9; the two side walls of the annular groove 5 are provided with a plurality of second strip-shaped ribs 10 distributed at intervals, which also act as reinforcing ribs and increase the strength of the piston 1.

[0027] The end face of some of all the first strip-shaped ribs 4 on the piston 1 is provided with a protrusion 11, and the annular groove 5 is provided with a positioning piece 12. Thus, during assembly, it can act as a mistake-proof limiting device, and if it is not in the correct position, it cannot be embedded, and with the positioning piece, it can only be installed at the correct circumferential position, effectively solving the possibility of error.

[0028] As shown in the figure, Figure 4 The end of at least one first strip-shaped rib 4 is provided with a protrusion 11, and the end of the first strip-shaped rib 4 after the protrusion 11 is located within the center of the piston 1, the protrusion 11 is cylindrical, which makes the ejection and demolding uniform, reduces the shrinkage, and the product assembly size is stable. The protrusion 11 is integrally formed with the first strip-shaped rib 4 at this position.

[0029] As shown in the figure, Figure 6 The positioning piece 12 is in a T-shaped structure and includes a first connecting plate 13 and a second connecting plate 14, the first connecting plate 13 and the second connecting plate 14 are distributed along the axis parallel to the piston 1, the inner side of the first connecting plate 13 is fixed to the inner side wall of the annular groove 5, and the outer side is fixed to the second connecting plate 14, and the second connecting plate 14 is located between adjacent second strip-shaped ribs 10. The first connecting plate 13 and the second connecting plate 14 are in a vertical state. The second connecting plate 14 can be a straight plate or have a certain curvature.

[0030] As shown in the figure, Figure 5 The second connecting plate 14 is located between two second strip-shaped ribs 10 and has a spacing therebetween, that is, does not touch the second strip-shaped ribs 10, and has a suspended structure.

[0031] The first connecting plate 13 and the second connecting plate 14 are located in the cavity between the second mounting hole 7 and the third mounting hole 8.

[0032] AsFigure 7 As shown, the axis of the protruding block 11 is parallel to the axis of the piston 1 and is laid on the end surface of the first strip-shaped protrusion 4, the diameter of the protruding block 11 is greater than the thickness of the first strip-shaped protrusion 4 and less than the length of the first strip-shaped protrusion 4.

[0033] The working principle of the height valve piston includes two states, full state and exhaust state. Full state: when the vehicle load increases, the air spring is compressed, the vehicle body sinks, the lever rotates upward around the drive shaft, the eccentric pin pushes the piston to move left, and the inlet valve is opened. The compressed air on the total air side pushes the valve head, opens the check valve, enters the air spring through the inlet valve, and raises the vehicle body height. And when the rotation angle of the lever is small, the gap between the piston rod and the inner wall of the valve body is narrow, which plays a throttling role, reducing the air filling speed; when the rotation angle is large, the gap between the piston rod and the valve body is large, increasing the air inlet flow, realizing fast filling. Exhaust state: when the vehicle load decreases, the air spring expands, the vehicle body rises, the lever rotates downward around the drive shaft, the eccentric pin pulls the piston rod to move right, and the exhaust valve is opened. At this time, the inlet valve is closed under the action of the spring and the valve head pressure, cutting off the total air and air spring passage. If the vehicle load decreases less, the piston rod throttling makes the air spring slowly exhaust; when the vehicle load decreases more, the rotation angle of the piston rod is large, directly connecting the exhaust passage of the air spring and the piston rod, and quickly exhausting.

Claims

1. A built-in height valve piston, comprising a piston (1), a base (2) and a sliding sleeve (3), the piston (1) is tubular, the base (2) is embedded in one end of the central hole of the piston (1), the inner end of the sliding sleeve (3) is embedded in the piston (1) through the base (2), the inner wall of the end of the base (2) installed on the piston (1) is provided with a plurality of first strip-shaped convex strips (4) distributed at intervals, each convex strip (4) extends to the middle part of the inner wall of the piston (1), the end face of the other end of the piston (1) is provided with an annular groove (5), the axis of the annular groove (5) is located on the same straight line with the axis of the piston (1), the annular groove (5) is provided with a first mounting hole (6), a second mounting hole (7) and a third mounting hole (8), the first mounting hole (6) is provided with a solenoid valve (9); the two side walls of the annular groove (5) are provided with a plurality of second strip-shaped convex strips (10) distributed at intervals; characterized in that: The end face of some of the first strip protrusions (4) on the piston (1) is provided with a protrusion (11), and the annular groove (5) is provided with a positioning sheet (12).

2. An in-line height valve piston according to claim 1, characterized in that: The end of the first strip protrusions (4) at least spaced by one is provided with a protrusion (11), and the end of the first strip protrusions (4) after the protrusion (11) is added is located within the center of the piston (1).

3. An in-line height valve piston according to claim 1 or 2, characterized in that: The protrusion (11) is cylindrical and integrally formed with the first strip protrusion (4) at the position.

4. An in-line height valve piston as defined in claim 1, wherein: The positioning sheet (12) is T-shaped and includes a first connecting plate (13) and a second connecting plate (14), the first connecting plate (13) and the second connecting plate (14) are distributed along the axis of the piston (1), the inner side of the first connecting plate (13) is fixed with the inner side wall of the annular groove (5), the outer side is fixed with the second connecting plate (14), and the second connecting plate (14) is located between adjacent second strip protrusions (10).

5. An in-line height valve piston according to claim 4, wherein: The second connecting plate (14) is located between two second strip protrusions (10) and spaced therebetween.

6. An in-line height valve piston as defined in claim 4, wherein: The first connecting plate (13) and the second connecting plate (14) are located in the cavity between the second mounting hole (7) and the third mounting hole (8).

7. An in-line height valve piston according to claim 1 or 2, characterized in that: The protrusion (11) is axially parallel to the axis of the piston (1) and is laid on the end face of the first strip protrusion (4), the diameter of the protrusion (11) is greater than the thickness of the first strip protrusion (4) and less than the length of the first strip protrusion (4).

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