CN217502416U

CN217502416U - Piston assembly for hydraulic damper, hydraulic damper and treadmill

Info

Publication number: CN217502416U
Application number: CN202221741495.XU
Authority: CN
Inventors: 陈俊
Original assignee: Yongkang Junlong Technology Co ltd
Current assignee: Yongkang Junlong Technology Co ltd
Priority date: 2022-07-06
Filing date: 2022-07-06
Publication date: 2022-09-27
Anticipated expiration: 2032-07-06

Abstract

The utility model discloses a piston assembly for hydraulic damper, include: the piston can be in sealing fit with the inner pipe, a mounting hole is formed by hollow penetration, and a plurality of oil passing holes are formed around the circumferential direction of the mounting hole; the check ring comprises an outer ring and an inner ring, the outer ring surrounds the oil passing hole and is arranged on the radial outer ring of the oil passing hole, the inner ring is positioned on the inner side of the oil passing hole, the top surfaces of the inner ring and the outer ring are positioned at the same height, and the outer ring forms an oil passing gap along the radial direction; the end part of the piston rod is assembled and connected with the mounting hole and is provided with an elongated section protruding out of the mounting hole, and the elongated section is connected with a limiting piece; the valve block is annular and is axially and movably arranged between the limiting part and the check ring. The utility model also discloses a hydraulic damper. The utility model also discloses a treadmill. The utility model discloses the damping effect is showing, and the uniformity of damping effect is high, and processing is convenient, long service life, and the noise is little during the use.

Description

Piston assembly for hydraulic damper, hydraulic damper and treadmill

Technical Field

The utility model belongs to hydraulic damper field especially relates to a piston assembly, hydraulic damper and treadmill for hydraulic damper.

Background

The treadmill is a fitness equipment, plays a role in strengthening the cardiovascular system and exercising thigh and shank muscles through the action of continuously and repeatedly climbing stairs of a exerciser, and is widely loved by the exerciser. The treadmill generally comprises a pedal and a base, and a user repeatedly applies external force to press down the pedal by feet to achieve the purpose of exercise. The external force for driving the pedal to move is large, and the service life of the treadmill is closely related to the damper in the oil cylinder.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model provides a piston assembly, hydraulic damper and treadmill for hydraulic damper, which has the advantages of remarkable damping effect, long service life and reduced processing cost.

The utility model provides a technical scheme that its technical problem adopted is: a piston assembly for a hydraulic damper, comprising:

the piston can be in sealing fit with the inner pipe, a mounting hole is formed by hollow penetration, and a plurality of oil passing holes are formed around the circumferential direction of the mounting hole;

the check ring comprises an outer ring and an inner ring, the outer ring surrounds the oil passing hole and is arranged on the radial outer ring of the oil passing hole, the inner ring is positioned on the inner side of the oil passing hole, the top surfaces of the inner ring and the outer ring are positioned at the same height, and the outer ring forms an oil passing gap along the radial direction;

the end part of the piston rod is assembled and connected with the mounting hole and is provided with an elongated section protruding out of the mounting hole, and the elongated section is connected with a limiting piece;

the valve block is annular and is axially and movably arranged between the limiting part and the check ring.

The utility model discloses a cross the circulation that the oil gap realized a small amount of liquid, realize the circulation of a large amount of liquid through crossing the oilhole, and utilize the axial activity of valve block to make to cross the switching of oilhole between shutoff and open mode, the damping effect is showing, and processing is convenient, long service life.

Furthermore, the oil passing gaps are two and are symmetrically arranged along the radial direction. The oil passing gaps which are radially and symmetrically arranged enable the liquid to flow more uniformly, and the consistency of the damping effect is high; the size and the number of the oil passing gaps can be adjusted at will to control the size of the damping.

Furthermore, the end face of the piston is provided with a shunting part which is opposite to the oil passing gap in the radial direction and used for shunting the liquid passing through the oil passing gap to two sides in the circumferential direction. The liquid passing through the oil passing gap is uniformly distributed to two sides in the circumferential direction, and the liquid flows more uniformly.

Furthermore, the cross section of the flow dividing part is triangular, and the vertex angle of the flow dividing part points to the oil passing gap.

Furthermore, the end face of the piston and the radial inner side of the inner ring are provided with guide sections which are in a frustum shape, and the maximum outer diameter position is smaller than or equal to the inner diameter of the valve plate. The guide section is convenient to assemble, the moving range of the valve plate is increased, and large noise cannot be generated in the using process.

Furthermore, the oil passing hole and the oil passing gap are arranged in a staggered mode. The flow path of the liquid entering the oil passing hole through the oil passing gap is prolonged, and a good damping effect is guaranteed.

Further, the outer wall of the piston forms an annular groove for mounting a seal.

The utility model also discloses a hydraulic damper, including the inner tube, the outer tube in the inner tube outside is located to the cover, reaches above-mentioned piston assembly, piston and the sealed cooperation of inner tube wall.

The utility model also discloses a treadmill, including footboard and base, the base is equipped with above-mentioned hydraulic damper.

The utility model has the advantages that: the damping effect is obvious, and the uniformity of damping effect is high, and processing is convenient, long service life, and the noise is little during the use.

Drawings

Fig. 1 is a sectional view of the hydraulic damper of the present invention.

Fig. 2 is an enlarged view of a structure in fig. 1.

Fig. 3 is a perspective view of a partial structure of the piston assembly of the present invention.

Fig. 4 is a partial structural plan view of the piston assembly of the present invention.

Fig. 5 is a partially exploded view of the piston assembly of the present invention.

Detailed Description

In order to make the technical solution of the present invention better understood, the following figures in the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

As shown in fig. 1-5, a piston assembly for a hydraulic damper comprises a piston 1, a retainer ring 2, a piston rod 3 and a valve plate 4, wherein the piston 1 can be in sealing fit with an inner pipe 17; the piston 1 is formed with a mounting hole 12 through the hollow, the mounting hole 12 is connected to the end of the piston rod 3, and a plurality of oil passing holes 13 are provided around the outer periphery of the mounting hole 12. In this embodiment, the number of the oil passing holes 13 is six, which are arranged at regular intervals.

The retainer ring 2 is provided integrally with the piston 1, and includes an outer ring 21 surrounding the radially outer ring of the oil passing hole 13, and an inner ring 22 located radially inside the oil passing hole 13, and top surfaces of the inner ring 22 and the outer ring 21 are located at the same height, in other words, upper end surfaces of the inner ring 22 and the outer ring 21 are flush. The inner ring 22 is a closed circular ring structure, and the outer ring 21 forms an oil gap 23 along the radial direction.

After the piston rod 3 is assembled with the mounting hole 12, an elongated section 32 protruding from the mounting hole 12 is further provided, the elongated section 32 is connected with a limiting member 31, where the limiting member 31 may be a bolt or other structure, and functions to prevent the valve plate 4 from being separated.

The valve plate 4 is annular, is sleeved on the outer side of the piston rod 3, is located between the limiting member 31 and the piston 1, and is specifically axially movably installed between the limiting member 31 and the retainer ring 2.

Taking the directions shown in fig. 1 and fig. 2 as examples, when the piston rod 3 carries the piston 1 to move upwards, the valve plate 4 is pressed by the liquid to abut against the retainer ring 2, the oil passing hole 13 is shielded at this time, and a small amount of liquid flows in from the oil passing gap 23 and flows to the lower part of the piston 1 through the oil passing hole 13. When the piston rod 3 carries the piston 1 to move downwards, the valve plate 4 is pushed upwards by liquid to be separated from the retainer ring 2, the oil passing hole 13 is exposed at the moment, and a large amount of liquid flows to the upper part of the piston 1 from the oil passing hole 13. Thus achieving a good damping effect.

In order to make the liquid flow more uniform, as shown in fig. 4, the number of the oil passing slits 23 is two, and they are symmetrically arranged in the radial direction, that is, the outer ring 21 is cut into two semicircular rings. And the oil passing gap 23 and the oil passing hole 13 are arranged in a staggered mode, namely the oil passing gap 23 is positioned in the middle of two adjacent oil passing holes 13, and the radial projections of the oil passing hole 13 and the oil passing gap 23 are not overlapped.

The size and the number of the oil through gaps 23 can be adjusted at will, so that the purpose of controlling the damping is achieved, and the damping device can adapt to different application scenes.

In order to enable the liquid to uniformly flow from the oil passing gap 23 to both sides in the circumferential direction, the end surface of the piston 1 is provided with a flow dividing portion 14 which is diametrically opposed to the oil passing gap 23 and divides the liquid flowing to the oil passing hole 13 through the oil passing gap 23 to both sides in the circumferential direction. Specifically, the cross section of the flow dividing portion 14 is triangular, and the vertex thereof is directed to the oil passing slit 23.

The upper end face of the piston 1 is provided with a guide section 15 at the radial inner side of the inner ring 22, the guide section is in a frustum shape, the outer wall of the guide section inclines from top to bottom and from inside to outside, and the maximum part of the outer diameter is smaller than or equal to the inner diameter of the valve plate 4. The guide section 15 is convenient for assembling the valve plate 4, increases the range of motion of the valve plate 4, and does not generate large noise in the using process. The outer wall of the piston 1 forms an annular groove 16, which annular groove 16 is used for mounting the seal 5, so that a sealing engagement with the inner tube 17 is achieved by the seal 5.

The utility model also discloses a hydraulic damper, including inner tube 17, the cover is established at the outer tube 18 in the inner tube 17 outside, and foretell piston assembly, piston 1 and the sealed cooperation of inner tube 17 inner wall. Other structures are not described in detail.

The utility model also discloses a treadmill, it includes footboard and base, is provided with foretell hydraulic damper in the base, and other structures can realize for prior art, no longer give unnecessary details.

The above detailed description is provided for illustrative purposes, and is not intended to limit the present invention, and any modifications and variations of the present invention are within the spirit and scope of the following claims.

Claims

1. A piston assembly for a hydraulic damper, comprising:

the piston (1) can be in sealing fit with the inner pipe (17), a mounting hole (12) is formed in a hollow penetrating mode, and a plurality of oil passing holes (13) are formed in the circumferential direction of the mounting hole (12);

the retainer ring (2) comprises an outer ring (21) which surrounds the radial outer ring of the oil passing hole (13) and an inner ring (22) which is positioned on the radial inner side of the oil passing hole (13), the top surfaces of the inner ring (22) and the outer ring (21) are positioned at the same height, and the outer ring (21) forms an oil passing gap (23) along the radial direction;

the end part of the piston rod (3) is assembled and connected with the mounting hole (12), the piston rod is provided with an elongated section (32) protruding out of the mounting hole (12), and the elongated section (32) is connected with a limiting piece (31);

and the valve plate (4) is annular and is axially and movably arranged between the limiting piece (31) and the check ring (2).

2. Piston (1) assembly for a hydraulic damper, according to claim 1, characterized in that: the number of the oil passing gaps (23) is two, and the oil passing gaps are symmetrically arranged along the radial direction.

3. Piston (1) assembly for a hydraulic damper, according to claim 1 or 2, characterized in that: the end face of the piston (1) is provided with a shunting part (14) which is opposite to the oil passing gap (23) in the radial direction and used for shunting liquid passing through the oil passing gap (23) to two sides in the circumferential direction.

4. Piston (1) assembly for a hydraulic damper, according to claim 3, characterized in that: the cross section of the flow dividing part (14) is triangular, and the vertex angle of the flow dividing part points to the oil passing gap (23).

5. Piston (1) assembly for a hydraulic damper, according to claim 1, characterized in that: the end face of the piston (1) and the radial inner side of the inner ring (22) are provided with guide sections (15) which are frustum-shaped, and the maximum outer diameter position is smaller than or equal to the inner diameter of the valve plate (4).

6. Piston (1) assembly for a hydraulic damper, according to claim 1, characterized in that: the oil passing holes (13) and the oil passing gaps (23) are arranged in a staggered mode.

7. The piston assembly for a hydraulic damper as recited in claim 1, wherein: the outer wall of the piston (1) forms an annular groove (16) for installing a sealing element (5).

8. A hydraulic damper characterized by: comprising an inner tube (17), an outer tube (18) arranged around the inner tube (17), and a piston assembly according to any one of claims 1-7, wherein the piston (1) is in sealing engagement with the inner wall of the inner tube (17).

9. The utility model provides a treadmill, includes footboard and base, its characterized in that: the base is provided with a hydraulic damper as claimed in claim 8.