JPH04128545U - Hydraulic cylinder bearing structure - Google Patents

Abstract

(57) [Summary] [Purpose] Not only can it be expected to improve the workability of packing the seal ring in the bearing part, but also the sliding resistance and sliding performance of the piston rod against the bearing part by packing the seal ring. To provide a bearing part structure of a hydraulic cylinder that is optimal for maintaining the hydraulic cylinder as set. [Structure] In the bearing structure of a hydraulic cylinder, the bearing part 10 has a bearing part 10 that closes the upper end openings of the cylinder 1 and the outer cylinder 2 and allows the piston rod 3 to be slidably inserted through the shaft core thereof. The bearing member constituting the is divided into two parts, a lower cylinder side bearing member 11 and an upper outer cylinder side bearing member 12, and the cylinder side bearing member 11 is inserted into an annular groove 11a formed on the inner circumference of the upper end. It is formed so as to house a seal ring 6 that comes into sliding contact with the piston rod 3,
Cylinder side bearing member 1 after seal ring 6 is installed
It is assumed that an outer cylinder side bearing member 12 is arranged adjacent to the upper end surface of the bearing member 1 from above to form a predetermined bearing portion 10.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to an improvement in the bearing structure of a hydraulic cylinder.

0002

[Conventional technology]

Various bearing structures for hydraulic cylinders have been proposed in the past, but examples include For example, in a hydraulic cylinder as shown in Fig. 4, the upper ends of cylinder 1 and outer cylinder 2 are open. A bear that closes the mouth and allows the piston rod 3 to be slidably inserted into the shaft core of the bear. It has a ring part 4.

0003 As shown in FIG. 5, the bearing part 4 includes a bearing member 5 as a main body, and A seal ring housed in an annular groove 5a formed on the upper end side of the inner circumference of the ring member 5. 6, and an annular oil reservoir groove 5b bored on the inner peripheral side of the upper end surface of the bearing member 5. A hole is drilled diagonally through the thickness of the bearing member 5 to form the oil reservoir. The groove 5b is provided so as to face the lower end surface of the outer peripheral side of the bearing member 5. That is, the drain flow is formed by the gap formed between the cylinder 1 and the outer cylinder 2. The port 5c is configured to have a port 5c communicating with the path L.

0004 Note that when the seal ring 6 is placed in the annular groove 5a, the seal ring 6 is inserted into the annular groove 5a. It is said that the backup O-ring 7 will be installed first.

[0005] Therefore, according to the bearing structure, the piston rod 3 moves in and out of the cylinder 1. When doing so, a small amount is formed between the inner periphery of the seal ring 6 and the outer periphery of the piston rod 3. Hydraulic oil leaks to the upper end surface side of the bearing member 5 through a gap (not shown) The oil is temporarily stored in the oil sump groove 5b.

[0006] The hydraulic oil stored in the oil sump groove 5b is transferred to the cylinder through the port 5c. The drain flow is discharged into the drain flow path L formed between the outer cylinder 1 and the outer cylinder 2. It is recovered from the road L and reused for operating the hydraulic cylinder.

[0007] As a result, according to the conventional bearing structure described above, the arrangement of the seal ring 6 is Due to this, when the hydraulic cylinder expands and contracts, the seal ring 6 is exposed to more than necessary. While preventing oil leakage, it is possible to allow some oil leakage at the seal ring 6 portion. The elasticity of the hydraulic cylinder, that is, the bearing part 4 of the piston rod 3 is This means that sliding properties against the surface can be ensured.

[0008]

[Problem that the idea aims to solve]

However, in the conventional bearing structure described above, the piston rod There is a risk that the sliding resistance of the bearing part 3 to the bearing part 4 will be increased from the setting, and This has the disadvantage that it becomes difficult to stabilize the sliding performance of the piston rod 3 with respect to the bearing part 4. be.

[0009] That is, in the conventional bearing structure described above, the seal ring 6 is held in a predetermined position. The piston rod 3 has not yet been inserted into the annular groove 5a. When the shaft core of the bearing member 5 is in a transparent state, as shown in FIG. Fold the ring 6 into a heart shape, etc. (as shown in the phantom line in the figure), and Insert it into the hole in the bent state, and use the return force to close the seal. The ring 6 is housed in the annular groove 5a at a predetermined position.

0010 However, the seal ring 6 after being housed in the annular groove 5a has some problems due to its material. Therefore, the folding habit (indicated by reference numeral 6a in FIG. 6) will remain. The occurrence of the curl 6a increases the sliding resistance of the piston rod 3 against the seal ring 6. It will become a big deal.

[0011] In reality, the shape of the fold 6a is not uniform, and therefore, each product has a different shape. The sliding properties of the stone rod 3 with respect to the seal ring 6 vary, and as a result, the piston The sliding performance of the ton rod 3 against the bearing part 4 was not stable for all products. There is a certain inconvenience.

0012 Furthermore, the work of storing the seal ring 6 in the annular groove 5a is as described above. It goes without saying that it involves deformation work to the seal ring 6, but also after it is placed in the specified position. It also involves work to remove as much of the crease 6a remaining in the seal ring 6 as possible. Therefore, there is also the disadvantage that it is difficult to expect improvement in workability.

[0013] This device was devised in view of the above-mentioned circumstances, and its purpose is However, it is expected that it will improve the work efficiency of packing the seal ring in the bearing part. Of course, the bearing part of the piston rod can be removed by installing the seal ring. It is ideal for maintaining the sliding resistance and sliding performance as set. An object of the present invention is to provide a bearing structure for a hydraulic cylinder.

[0014]

[Means to solve the problem]

In order to achieve the above purpose, the structure of this invention was developed so that the upper ends of the cylinder and outer cylinder were opened. Beary that closes the mouth and allows the piston rod to be slidably inserted through the shaft core. In the bearing structure of a hydraulic cylinder having a bearing part, the bearing part is The constituent bearing members are a lower bearing member that closes the upper end opening of the cylinder; It is divided into two parts: an upper bearing member that closes the upper end opening of the outer cylinder, and a lower bearing member that closes the upper end opening of the outer cylinder. The bearing member slides into contact with the piston rod within an annular groove formed at the upper end of its inner circumference. After the seal ring is installed, the The upper bearing member is placed adjacent to the upper end surface of the lower bearing member from above. It is formed so as to constitute a fixed bearing part.

[0015] The lower bearing member is in sliding contact with the piston rod on the lower end side of its inner periphery. A notched groove into which a bushing member is fitted, and which allows leakage oil to flow through the outer circumferential surface of the bushing member. Suppose you have

[0016] The upper bearing member also has an annular oil reservoir bored on the inner circumferential side of its upper end surface. The upper bearing part has a groove, and one end is open on the upper end surface of the groove. A point that penetrates through the thickness of the material and has the other end open at the lower end surface of the outer peripheral side of the upper bearing member. Suppose you have a client.

[0017] Furthermore, the upper bearing member is stacked on the lower bearing member from above. When configuring a predetermined bearing part by placing them next to each other, the outer periphery of each of the above bearing members It is assumed that an oil passage is formed between the side end faces to allow the flow of hydraulic oil.

[0018] Note that there is a seal ring in the annular groove formed at the upper end of the inner circumference of the lower bearing member. Assume that the O-ring is installed before the ring is installed.

[0019]

[Effect]

Therefore, in order to accommodate the seal ring in the annular groove at a predetermined position, the piston The state in which the rod is inserted into the lower bearing member or before it is inserted into the lower bearing member. The seal ring can be placed in the annular groove without bending when the seal ring is in the It becomes possible to do so.

[0020] After the seal ring has been installed, the upper end surface of the lower bearing member is By placing the upper bearing member next to each other, a given bearing part can be completed. It becomes possible.

[0021] In addition, when storing the seal ring in the annular groove, the O-ring must be stored in advance. A seal ring is housed inside the O-ring.

[0022] Then, the piston rod inserted into the bearing section will protrude and retract from the cylinder. When the inner circumference of the seal ring located on the lower bearing member side and the piston rod The upper bearing member Hydraulic oil leaks from the upper end side.

[0023] This prevents leakage of hydraulic fluid more than necessary when the hydraulic cylinder expands and contracts. At the same time, a certain amount of oil leakage is allowed to reduce the expansion in the hydraulic cylinder. The compressibility, that is, the sliding ability of the piston rod against the bearing part is ensured. Become.

[0024] On the other hand, the hydraulic oil leaking onto the upper end surface of the upper bearing member forms an oil pool there. The hydraulic oil is temporarily stored in the groove, and the hydraulic oil stored in the oil sump groove is transferred to the upper bearing. Open port in bearing member, formed between upper and lower bearing members The oil passage is connected to the cylinder through the notched groove formed on the outer peripheral surface of the lower bearing member. The water is drained into a drain flow path formed by a gap formed between the outer cylinder and the drain flow path. The oil is recovered and reused for operating the hydraulic cylinder.

[0025]

【Example】

The following is an explanation based on the diagram: Hydraulic pressure according to an embodiment of this invention The bearing structure of the cylinder is as shown in Fig. 1. While closing the opening, the piston rod 3 is slidably inserted through the shaft core. It has a bearing part 10.

[0026] Incidentally, the above hydraulic cylinder is used when supplying hydraulic pressure to the piston side oil chamber (not shown). When the cylinder pressure is increased and the hydraulic pressure in the piston side oil chamber is discharged, The cylinder pressure is reduced during this period.

[0027] The bearing part 10 constitutes the bearing part 10 in this invention. a lower bearing member 11 whose bearing member closes the upper end opening of the cylinder 1; The upper bearing member 12 closes the upper end opening of the outer cylinder 2. are doing.

[0028] The lower bearing member 11 has an annular groove 1 formed at the upper end of its inner circumference. It is formed so that a seal ring 6 that comes into sliding contact with the piston rod 3 is housed inside 1a. The seal ring 6 is placed on the upper end surface of the lower bearing member 11 after the seal ring 6 is installed. A predetermined bearing portion 10 is configured by arranging the upper bearing members 12 next to each other from the side. It is formed to do so.

[0029] Further, the lower bearing member 11 is attached to the piston rod 3 on the inner periphery of its lower end. It is fitted with a bushing member 8 that comes into sliding contact, and allows leakage oil to flow through its outer peripheral surface. It has a cutout groove 11b, and a cylinder is inserted into an annular groove 11c formed on the outer periphery of the lower end. It includes an O-ring 13 that contacts the inner periphery of the upper end of the cylinder 1.

[0030] On the other hand, the upper bearing member 12 has an annular shape bored on its inner upper end surface. A groove having an oil sump groove 12a, and one end of which is open to the oil sump groove 12a. and the other end thereof is diagonally opened at the lower end surface on the outer peripheral side of the upper bearing member 12. An annular groove 12 having an open port 12b and formed on the outer periphery of the upper end thereof. A square ring 14 is housed inside c.

[0031] Then, the upper bearing member 12 is attached to the lower bearing member 11 from above. When placing adjacent bearing parts 10 in a stacked manner, each of the above-mentioned bases is There is a gap between the outer peripheral side end surfaces of the ring members 11 and 12 that allows the flow of hydraulic oil. It is assumed that an oil passage S is formed.

[0032] In addition, in the annular groove 11a formed in the inner peripheral part of the upper end of the lower bearing member 11, The O-ring 7 is installed before the seal ring 6 is installed, and the inner periphery of the O-ring 7 is It is assumed that a seal ring 6 is installed.

[0033] Therefore, according to the bearing part 10 formed as described above, the seal ring 6 When the piston rod 3 is housed in the annular groove 11a at a predetermined position, the piston rod 3 Either the state of being inserted into the ring member 12 or the state before being inserted. Even if the upper bearing member 12 is connected to the lower bearing 11, It becomes possible to store this as it is in the annular groove 11a before installation.

[0034] As a result, as in the conventional case, the seal ring 6 is bent and inserted into the annular groove 11a. Therefore, it is no longer necessary to store the seal ring 6 in the annular groove 11a. There is no fear that the folding tendency (refer to the reference numeral 6a in Fig. 6) will remain in the There is also a concern that the sliding resistance of the piston rod 3 against the seal ring 6 will increase due to this occurrence. You will no longer be invited.

[0035] Then, after the seal ring 6 is installed, the upper end surface of the lower bearing member 11 is By arranging the upper bearing member 12 next to each other from above, a predetermined bearing portion 10 It becomes possible to complete it.

[0036] Incidentally, in this embodiment, the upper end side outer periphery of the lower bearing member 11 and the upper A light press-fit portion between the inner periphery of the lower end of the ring member 12 (indicated by symbol P in the figure) It is assumed that both bearing members 11 and 12 are integrally connected.

[0037] Note that the expansion and contraction operation of the hydraulic cylinder having the bearing portion 10 described above is as follows. Since this is the same as in the conventional example, the explanation thereof will be omitted.

[0038] FIGS. 2 and 3 show other embodiments of this invention, but their basis is The main structure is the same as that of the embodiment shown in FIG. It has undergone significant changes.

[0039] Therefore, the configuration of each of the following embodiments is the same as that of the embodiment shown in FIG. , the same reference numerals are given in the figure and the explanation thereof is omitted, and the following We will mainly explain the differences.

[0040] That is, in the embodiment shown in FIG. While the port 12b is an oblique port in the embodiment described above, The upper bearing member 12 is configured as a vertical port that opens vertically through the wall thickness of the upper bearing member 12. The port 12b in the holding member 12 can be opened easily.

[0041] In addition, in this embodiment, the lower bearing part in which the notch groove 11b is opened is Lightly press-fit between the outer periphery of the upper protrusion of the member 11 and the inner periphery of the lower end of the upper bearing member 12 By setting the light press-fitting part P, the upper part of the lower bearing member 11 is Connection to the bearing member 12 is possible.

[0042] In addition, in the embodiment shown in FIG. The lower bearing member 1 has a notch groove 11b formed therein. 1 and the lower end inner circumference of the upper bearing member 12. The bearing members 11 and 12 are integrally connected.

[0043] Therefore, according to this embodiment, the port in the upper bearing member 12 12b can be easily opened, as well as the upper end side of the lower bearing member 11. is wrapped around the lower side of the upper bearing member 12, so both bearings It becomes possible to increase the integrity of the ring members 11 and 12.

[0044]

[Effect of the idea]

As described above, according to this invention, the seal ring is housed in the annular groove at a predetermined position. When the piston rod is inserted into the lower bearing member, The upper bearing member is connected to the lower bearing member in either the pre-insertion state or the It is now possible to store it in the annular groove as it is before installing it next to the ring. At the same time, the upper end surface of the lower bearing member after the seal ring is installed is By placing the upper bearing member next to the upper bearing member, the specified bearing part can be completed. As a result, it is now possible to create an annular groove by bending the seal ring as in the past. There is no need to store the seal ring inside the bearing section, and the work of storing the seal ring in the bearing section is eliminated. Not only can it be expected to improve work efficiency, but also the seal ring can be folded after being stored in the annular groove. There is no risk that the creases will remain, and therefore the piston rotation due to the occurrence of creases as in the conventional method is avoided. There is no risk of increased sliding resistance against the seal ring of the head, and the seal ring The sliding resistance and sliding performance of the piston rod against the bearing section are set by the housing of the piston rod. This makes it ideal for use in hydraulic cylinders and its versatility. It has a number of effects, such as the expected improvement in

[Brief explanation of drawings]

FIG. 1 is a partial vertical sectional view showing the structure of a bearing part of a hydraulic cylinder according to an embodiment of the invention.

FIG. 2 is a partial vertical sectional view similar to FIG. 1 showing the structure of a bearing part of a hydraulic cylinder according to another embodiment.

FIG. 3 is a partial vertical cross-sectional view, similar to FIG. 1, showing the structure of a bearing portion of a hydraulic cylinder according to yet another embodiment.

FIG. 4 is a partial vertical sectional view showing a bearing portion in a conventional hydraulic cylinder.

5 is a partial vertical cross-sectional view showing the bearing structure of the hydraulic cylinder shown in FIG. 4, similar to FIG. 1;

FIG. 6 is a plan view showing the seal ring in FIG. 5;

[Explanation of symbols]

1 cylinder 2 Outer cylinder 3 Piston rod 6 Seal ring 10 Bearing part 11 Lower bearing member 11a Annular groove 12 Upper bearing member S oil passage

Claims (1)

[Scope of utility model registration request] Claim 1: A bearing structure of a hydraulic cylinder, which comprises a bearing part that closes the upper end openings of the cylinder and the outer cylinder and allows a piston rod to be slidably inserted into the shaft center of the bearing part. The bearing member includes a lower bearing member that closes the upper end opening of the cylinder and an upper bearing member that closes the upper end opening of the outer cylinder.
The lower bearing member is formed so as to house a seal ring that slides on the piston rod in an annular groove formed at the upper end of its inner periphery, and the lower bearing member after the seal ring is housed. 1. A bearing structure for a hydraulic cylinder, characterized in that an upper bearing member is formed adjacent to the upper end surface of the member from above to constitute a predetermined bearing part.