CN111828428A

CN111828428A - Universal oil hydraulic cylinder

Info

Publication number: CN111828428A
Application number: CN201910378868.8A
Authority: CN
Inventors: 郭本源; 朱冏昇
Original assignee: Ashun Fluid Power Co ltd
Current assignee: Ashun Fluid Power Co ltd
Priority date: 2019-04-15
Filing date: 2019-05-08
Publication date: 2020-10-27
Anticipated expiration: 2039-05-08
Also published as: TWI702343B; CN111828428B; TW202040013A

Abstract

The invention provides a universal oil hydraulic cylinder, which comprises a piston rod and a movable supporting part arranged on the piston rod, wherein the piston rod is provided with a concave arc surface, the movable supporting part is provided with a convex arc surface which is convex downwards, and the convex arc surface is contacted with the concave arc surface of the piston rod in a matching way, so that the movable supporting part can rotate or swing on the piston rod in multiple directions in a small way.

Description

Universal oil hydraulic cylinder

Technical Field

The present invention relates to a hydraulic cylinder, and more particularly to a universal hydraulic cylinder.

Background

The conventional hydraulic lift 1 shown in fig. 8 includes a cylinder 11, a piston rod 12, and a piston 13. During an upward stroke, a hydraulic circuit (not shown) starts the oil-feeding operation, which drives the oil into the cylinder 11 through the joint 14, and thus pushes the piston 13 to ascend from a home position, and simultaneously drives the piston rod 12 to ascend, so as to move the object O supported by the piston rod 12 upward. In a descending stroke, the hydraulic circuit stops the oil feeding operation, at this time, the piston rod 12 is pushed downwards by the weight of the object O, and the oil below the piston 13 flows back to the hydraulic circuit through the joint 14 until the piston 13 moves back to the original position.

However, since the piston rod 12 and the shaft hole 151 of the cylinder head 15 are not completely tight, and the peripheral wall of the piston 13 is not entirely tightly attached to the inner wall of the cylinder 11, when the top end 121 of the piston rod 12 is just pushed against the center of gravity or the vicinity of the center of gravity of the object O, the lifting and lowering of the piston rod 12 can be kept straight up and down without being biased, however, when the position point where the top end 121 of the piston rod 12 is not pushed against the object O is deviated from the center of gravity, it is difficult to ensure that the piston rod 12 is lifted and lowered straight, and even when the deviation amount is large and the object O is heavy, the piston rod 12 is deflected, fig. 9 shows a partial enlarged view of the piston rod 12 at the cylinder head 15 when the piston rod 12 is deflected, fig. 10 shows a partial enlarged view of the piston 13 when the piston rod 12 is deflected, and as can be seen from the observation of fig. 9 and 10, the deflected piston rod 12 affects, the metal piston 13 also scratches the inner wall of the cylinder 11 and causes noise.

Disclosure of Invention

In view of the above problem, the present invention provides a universal oil hydraulic cylinder including: a cylinder body; a piston which can be movably arranged in the cylinder body up and down; the piston rod is provided with a bottom section connected with the piston and a top section extending out of the cylinder body, the top section is provided with a top surface, the top surface is a concave arc surface downwards concave, and a fixing hole is arranged at the center of the concave arc surface; the movable supporting part is provided with a base and a ring wall, the base is provided with a top surface, a bottom surface and a through hole which penetrates through the base in the longitudinal direction, the bottom surface is a convex arc surface which is convex downwards, the convex arc surface is contacted with the concave arc surface of the piston rod in a matching way, the through hole is positioned in a central position of the base and is right opposite to the fixing hole of the piston rod, and the ring wall extends upwards from the top surface of the base and surrounds the through hole of the base; a fixing part, having a head and a body extending downwards from the head, the body passing through the through hole of the movable support part and then being fixed in the fixing hole of the piston rod, the head being located in the ring wall of the movable support part and lower than the ring wall and being capable of limiting the movable support part to separate from the body, wherein a gap is formed between the body and the through hole of the movable support part, a gap is formed between the head and the ring wall of the movable support part, and a gap is formed between the head and the top surface of the base of the movable support part.

In an embodiment of the present invention, a top surface of the annular wall of the movable supporting portion has an inner plane and an outer inclined plane, and a width of the inner plane is smaller than that of the outer inclined plane.

Compared with the prior art, the movable supporting part can do multidirectional small-amplitude swing on the piston rod, so that the movable supporting part can correspondingly deflect along with the offset of a supported object, the piston rod can still smoothly move vertically and vertically without being influenced by the offset of the object, and the problems of irregular lifting □, abrasion, scratch, noise and the like in the prior art can be solved.

Drawings

The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, the proportional sizes, and the like of the respective members in the drawings are merely schematic for facilitating the understanding of the present invention, and do not specifically limit the shapes, the proportional sizes, and the like of the respective members of the present invention. Those skilled in the art, having the benefit of the teachings of this invention, may choose from the various possible shapes and proportional sizes to implement the invention as a matter of case.

Fig. 1 is a partially exploded perspective view of a preferred embodiment of the present invention.

Fig. 2 is a perspective external view of the movable support portion 25.

Fig. 3 is a perspective view of the preferred embodiment.

Fig. 4 is a cross-sectional view of the preferred embodiment.

FIG. 5 is an enlarged partial cross-sectional view of the preferred embodiment.

Fig. 6 and 7 schematically show the movable supporting portion 25 of the preferred embodiment supported on different positions of an object O.

Fig. 8 is a sectional view of a conventional hydraulic lift device.

Fig. 9 is a partially enlarged sectional view of a cylinder head of the conventional hydraulic lifting device.

Fig. 10 is a partially enlarged sectional view of a piston of the conventional hydraulic lift device.

Description of reference numerals:

cylinder

11, 21

Bottom section 221 of

piston rod

12, 22

Top surface 222a of top section 222

Fixing hole 222b

Piston 13, 23 joint 14

Cylinder cover 15 shaft hole 151

Movable support part 25

Top surface 251a of substrate 251

Bottom surface 251b passes through hole 251c

Ring wall 252

Inner flat surface 252a and outer inclined surface 252b

Fixing member 26

Head 261 and body 262

Gaps G1, G2, G3

Detailed Description

The details of the present invention can be more clearly understood in conjunction with the accompanying drawings and the description of the embodiments of the present invention. However, the specific embodiments of the present invention described herein are for the purpose of illustration only and are not to be construed as limiting the invention in any way. Any possible variations based on the present invention may be conceived by the skilled person in the light of the teachings of the present invention, and these should be considered to fall within the scope of the present invention.

Fig. 1 to 5 show a preferred embodiment of the universal oil hydraulic cylinder of the present invention, which includes a cylinder body 21, a piston 23, a piston rod 22, a movable supporting portion 25 and a fixing member 26. The piston 23 is provided in the cylinder 21 so as to be movable up and down. The piston rod 22 has a bottom section 221 connected to the piston 23 and a top section 222 extending out of the cylinder 21. The top section 222 has a top surface 222 a. The top surface 222a is a concave arc surface that is concave downward, and the concave arc surface may be a spherical surface, but is not limited thereto. The top surface 222a, i.e. a central position of the concave arc surface, is provided with a fixing hole 222 b.

The movable support 25 has a base 251 and a ring wall 252. The base 251 has a top surface 251a, a bottom surface 251b and a through hole 251c extending longitudinally therethrough. The bottom surface 251b is a convex arc surface protruding downward, and the convex arc surface, i.e. the bottom surface 251b, is in contact with the concave arc surface of the piston rod, i.e. the top surface 222a, in a fitting manner. The through hole 251c is located at a central position of the base 251 and is opposite to the fixing hole 222b of the piston rod 22. The annular wall 252 extends upward from the top surface 251a of the substrate 251 and surrounds the through hole 251c of the substrate 251.

In this embodiment, a top surface of the annular wall 252 of the movable support 25 has an inner plane 252a and an outer inclined plane 252b, and the width of the inner plane 252a is smaller than that of the outer inclined plane 252b, so that the contact surface between the annular wall 252 of the movable support 25 and an object O in fig. 5 can be reduced.

Fastener 26 has a head 261 and a body 262 extending downwardly from head 261. The body 262 is fixed in the fixing hole 222b of the piston rod 22 after passing through the through hole 251c of the base 251 of the movable support 25. The head 261 is located in the ring wall 252 of the movable support 25 and is lower than the ring wall 252, and can limit the movable support 25 from separating from the body 262. In this embodiment, the fixing member 26 is a bolt, and the fixing hole 222b is an internal threaded hole correspondingly threaded to the bolt, but not limited thereto. As shown in fig. 4, a gap G1 exists between the body 262 and the through hole 251c of the movable support 25, a gap G2 exists between the head 261 and the annular wall 252 of the movable support 25, and a gap G3 exists between the head 261 and the top surface 251a of the base 251 of the movable support 25.

Since the bottom surface 251b of the movable support portion 25, i.e., the convex arc surface, is in contact with the top surface 222a of the piston rod 22, i.e., the concave arc surface, in a fitting manner, and the gaps G1, G2, and G3 are maintained between the movable support portion 25 and the retainer 26, the movable support portion 25 can rotate and can perform multidirectional small-amplitude swinging, such as small-amplitude swinging in the left-right direction and small-amplitude swinging in the front-back direction, on the top surface 222a of the piston rod 22, i.e., the concave arc surface, thereby having a function similar to a universal joint and being capable of performing small-amplitude rotation.

Fig. 6 and 7 schematically show the situation that the movable supporting portion 25 is supported to different positions of the object O, and since neither of them is supported to the gravity center position of the object O, the movable supporting portion 25 will swing toward the heavier side of the object O, fig. 6 shows the movable supporting portion 25 swinging leftward, and fig. 7 shows the movable supporting portion 25 swinging rightward, however, no matter which direction the movable supporting portion 25 swings toward, the piston rod 22 will not follow the deflection, so that the piston rod 22 can be ensured to be substantially straight and straight during the process of pushing or lowering the object O, and therefore the lifting and lowering are in the same direction □, which can solve the problems of the prior art, such as the lifting and lowering out of the same direction □, abrasion, scratch, and noise.

The present invention is not limited to the above embodiments, and in particular, various features described in different embodiments can be arbitrarily combined with each other to form other embodiments, and the features are understood to be applicable to any embodiment except the explicitly opposite descriptions, and are not limited to the described embodiments.

Claims

1. A universal oil hydraulic cylinder, comprising:

a cylinder body;

a piston which can be movably arranged in the cylinder body up and down;

the piston rod is provided with a bottom section connected with the piston and a top section extending out of the cylinder body, the top section is provided with a top surface, the top surface is a concave cambered surface downwards concave, and a fixing hole is arranged at the center of the concave cambered surface;

the movable supporting part is provided with a base and a ring wall, the base is provided with a top surface, a bottom surface and a through hole which is longitudinally penetrated, the bottom surface is a convex cambered surface which is convex downwards, the convex cambered surface is contacted with the concave cambered surface of the piston rod in a matching way, the through hole is positioned in a central position of the base and is right opposite to the fixing hole of the piston rod, the ring wall extends upwards from the top surface of the base, and the ring wall surrounds the through hole of the base;

the fixing piece is provided with a head part and a body part extending downwards from the head part, the body part penetrates through the through hole of the movable supporting part and then is fixed in the fixing hole of the piston rod, the head part is positioned in the annular wall of the movable supporting part and is lower than the annular wall, the head part can limit the movable supporting part to be separated from the body part, a gap is formed between the body part and the through hole of the movable supporting part, a gap is formed between the head part and the annular wall of the movable supporting part, and a gap is formed between the head part and the top surface of the base of the movable supporting part.

2. The universal oil pressure cylinder as claimed in claim 1, wherein a top surface of the annular wall of the movable support portion has an inner plane and an outer inclined plane, and the width of the inner plane is smaller than that of the outer inclined plane.