JPH04129961U - Hydraulic cylinder piston mounting device - Google Patents

Abstract

(57) [Summary] [Purpose] This invention relates to a structure for fastening a piston to a rod of a hydraulic cylinder that is easy to disassemble and assemble. [Structure] In a hydraulic cylinder in which a piston is fastened to a rod of a hydraulic cylinder, a pair of spacers are swingably locked by locking pins in order to fasten the piston to the rod of the hydraulic cylinder, and a spring is fixed to the spacer. It consists of a locking pin and a spring that is locked to the pin and applies an inward contraction force to the spacer. [Effects] Special tools for large-scale disassembly and assembly are not required, and disassembly and repair can be done on-site, so disassembling and assembling nylon nuts takes only a short time, reducing loss of work time. Moreover, the fastening device becomes smaller.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a piston mounting device for a hydraulic cylinder, and particularly relates to a piston mounting device for a hydraulic cylinder. This invention relates to a structure for fastening a piston to a rod.

0002

[Conventional technology]

FIG. 5 is a front sectional view of the hydraulic cylinder 30. Inside the cylinder 31, there is a lock. A rod is connected to one end of the door 41 to connect it to a related member (not shown) via a pin 42. A pad 43 is welded to the other end of the piston. 46 is inserted into the stepped part 45, and a nylon nut (not shown) or a half-split nut is inserted into the stepped part 45. After inserting the spacers 61a and 61b into the grooves 44 of the stepped portion 45, the bolts 62 The piston 46 is screwed onto the piston 46 or fastened thereto. As shown in Figure 5, the lock A screw cap 48 is fitted into the rod 41, and a screw cap 48 is fitted with a system to prevent oil leakage from the rod. rod 49 and a rod system that prevents dust, dirt, etc. from entering the inside of the cylinder 31. The rod 50 and the bearing 51 that holds the rod 41 are inserted, and the nylon nut and Alternatively, the lock with the piston 46 fastened by spacers 61a, 61b, etc. The door assembly 40 is fitted into the cylinder 31 to form the hydraulic cylinder 30. Ru. The rod assembly 40 is used to tighten or loosen the piston 46. It is carried out in a state. Final tightening work or sealing of this nylon nut (not shown) 49, at the initial stage of loosening work such as replacing the rod seal 50, Special tools for disassembly and assembly (repair stand) as shown in the side view of the repair stand. is used.

0003

[Problem that the idea aims to solve]

However, according to the conventional technology, the tightening torque of the nylon nut is very low. It is large and extremely difficult to tighten or loosen manually using a regular spanner. During the final tightening or loosening of nylon nuts, As mentioned above, it is difficult to disassemble and assemble the large-scale repair stand shown in Figure 6. Special tools are required for erection. Do you bring disassembly tools like this to the site? It is difficult to disassemble and repair on-site, and it costs a large amount of money to deploy them all over the country. It is expensive and requires a large space for installation. In addition, nylon It takes time to disassemble and assemble the kit, resulting in a large loss of working time. Also, split in half When screwing the spacer into the groove of the stepped part and then screwing it onto the piston with a bolt, , since the outer diameter Da of the spacer is larger, a smaller hydraulic cylinder is required. Alternatively, the hydraulic system may have a small distance La between the inner diameter of the cylinder and the outer diameter of the piston rod. There is a problem in Linda that it is difficult to recruit. This invention was created with a focus on the above problem, and it is In particular, the piston is attached to the rod of a hydraulic cylinder that is easy to disassemble and assemble. Regarding the structure to be fastened.

0004

[Means to solve the problem]

In order to achieve the above object, in the first invention related to the present invention, a hydraulic cylinder In a hydraulic cylinder where the piston is fastened to the rod of the hydraulic cylinder, the piston is connected to the rod of the hydraulic cylinder. A pair of spacers that are swingably locked with a locking pin to fasten the piston, and a spacer A pin that is fixed to the spacer and locks the spring, and a pin that is locked to the pin and contracts inward to the spacer. It consists of a spring that provides force.

[0005] Furthermore, in a second invention based on the first invention, at least one of the pair of spacers is One side is also tapered.

[0006]

[Effect]

According to the above configuration, after the spring is inserted through the groove and locked to the pin, the predetermined portability is achieved. Using a suitable jig, open the spring and insert the spacer into the groove from the end of the rod. Alternatively, after inserting the spacer into the groove of the rod, insert the spring through the groove and tighten the pin. Because it can be locked to the handle, it can be used for disassembly and assembly such as large-scale repair stands. No special tools are required. In addition, because this disassembly and repair work can be done on site, Disassembling and assembling nuts takes only a short time, reducing loss of work time. Also , the outer diameter of the fastening device has become particularly small, and the inner diameter of the cylinder and the outer diameter of the piston rod have become smaller. Although the ratio is small, even a hydraulic cylinder can be easily disassembled.

[0007]

【Example】

Below, examples of the piston mounting device for a hydraulic cylinder according to the present invention will be described. This will be explained in detail with reference to the drawings. Figure 1 shows the piston installation of the hydraulic cylinder of this invention. FIG. 3 is a partial side cross-sectional view of the device. Figure 2 shows the fastening device, and Figure 2(a) shows the fastening device. The assembly drawing, FIG. 2(b) is a lower side view of the fastening device (view from the Z arrow in FIG. 2(a)), and FIG. c) is an upper side view of the fastening device (view from the W arrow in FIG. 2(a)), and FIG. ) is shown. Parts that are the same as those in the conventional example are given the same reference numerals and explanations are omitted. . FIG. 3 is a partial sectional view of the hydraulic cylinder 1, and inside the cylinder 31 there is a rod. In order to connect one end of 3 to a related member (not shown) via a pin 42 as in the conventional example. A rod head 43 is welded to the other end, and a piston 4 is fastened to the other end as shown in FIG. A stepped portion 6 having a groove 5 is provided, and the piston 4 is fitted into the stepped portion 6 to complete the fastening device. It is fastened and inserted by the bracket 10. In FIG. 3, a screw cap 48 is attached to the rod 3. The screw cap 48 is fitted with a seal 49 to prevent oil leakage from the rod 3 and a dust cover 48. , a rod seal 50 that prevents dirt, etc. from entering the inside of the cylinder 31, and a rod 3 is inserted, and the piston 4 is fastened by the fastening device 10. 2 is a diagram of the rod assembly 20 in a state where the rod assembly 20 is in a cylinder The hydraulic cylinder 1 is formed by being fitted into the cylinder 31. Tighten the piston 4 above. The loosening is performed in the state of the rod assembly 20.

[0008] As shown in FIG. 2(a), the fastening device 10 includes approximately half-shaped spacers 21, 2. 2, a locking pin 23 that connects the spacers 21 and 22, and a locking pin 23 that connects the spacers 21 and 22. It is locked by pins 24 and 25 fixed to spacers 21 and 22 that provide tension. It is composed of a spring 26. Further, the spacers 21 and 22 are attached to the locking pin 23. The thickness is approximately half at the periphery, and grooves 21a and 22 are formed at the pins 24 and 25. a (shown in FIG. 2(a)) is cut out, and a spring 26 is inserted therein. Tighten The connecting device 10 is inserted into the groove 5 of the stepped portion 6 of the rod 3 and connects the piston 4 to the rod 3. conclude.

[0009] Next, the operation will be explained. For example, the rod seal 50 is damaged and needs to be replaced. If the new rod seal 50 is inserted into the screw cap 48, then the rod 3 is screwed. Insert the lid 48. After inserting the screw cap 48, next place the piston 4 on the rod 3. Insert it so that it contacts the attaching part 6. Next, insert the spring 26 through the grooves 21a and 22a. After inserting it and locking it to the pins 24 and 25, use a specified jig to push it against the spring 26. The inner diameter d (of the spacers 21 and 22) is determined from the outer diameter D (shown in FIG. It is shown in FIG. 2(a). ) until it becomes large and insert it into the groove 5 from the end side of the rod 3. do. Alternatively, open the spacers 21 and 22 that are locked with the locking pin 23, and 3 into the groove 5. Insert the spring 26 through the grooves 21a and 22a using a specified jig. the spacers 21 and 22 at the bottom of the groove 5 with the compression force of the spring. 5a.

0010 FIG. 4 shows a second embodiment of the fastening device, in which the fastening device 70 is similar to the spacer 2 of the first embodiment. 1 and 22, tapered spacers 71 and 72 and a tapered rod 3 are used. A groove 75 having a diameter is cut. As a result, the longitudinal direction of the axis of the piston 4 ( It is also possible to eliminate gaps (backlash in the X direction). In addition, the longitudinal direction of the piston 4 Dimensions, processing accuracy of rod groove 75, and longitudinal dimension of spacers 71, 72 There is no need to improve the X-direction, and looseness in the X direction can be eliminated.

[0011]

[Effect of the idea]

As explained above, according to the present invention, parts such as large-scale repair stands can be This eliminates the need for special tools for disassembly and assembly, and allows for on-site disassembly and repair. Disassembling and assembling iron nuts takes a short time, reducing loss of work time. Moreover, the fastening device becomes smaller. In particular, since the outer diameter becomes smaller, the inner diameter of the cylinder The ratio of the outer diameter of the stone rod is small, i.e. the inner diameter of the cylinder and the piston rod. Although the distance from the outside diameter of the cylinder is small, even a hydraulic cylinder can be easily disassembled. can.

[Brief explanation of drawings]

FIG. 1 is a partial side sectional view of a piston mounting device for a hydraulic cylinder according to the present invention.

FIG. 2 is a diagram of the fastening device of the present invention, FIG. 2(a) is an assembled view of the fastening device, FIG. 2(b) is a lower side view of the fastening device,
Figure 2(c) is an upper side view of the fastening device, and Figure 2(d) is Figure 2
AA sectional view of (a).

FIG. 3 is an assembly diagram of the rod assembly of the present invention.

FIG. 4 is a partial side sectional view of a piston mounting device for a hydraulic cylinder according to a second embodiment of the present invention.

FIG. 5 is a side sectional view of a conventional hydraulic cylinder.

[Figure 6] Side view of conventional repair stand

[Explanation of symbols]

1 Hydraulic cylinder 3 rod 4 Piston 20 Fastening device 23 Locking pin 20 Rod assembly 21, 22 Spacer 24, 25 pin 26 Spring

Claims (2)

[Scope of utility model registration request] Claim 1: In a hydraulic cylinder in which a piston is fastened to a rod of the hydraulic cylinder, a pair of spacers are swingably locked to the rod of the hydraulic cylinder in order to fasten the piston to the rod of the hydraulic cylinder, and a spacer is fixedly attached to the spacer. A piston mounting device for a hydraulic cylinder, comprising a pin that locks a spring, and a spring that is locked to the pin and applies an inward contraction force to a spacer. 2. The piston mounting device for a hydraulic cylinder according to claim 1, wherein at least one of the pair of spacers is tapered.