JP2538782Y2 - Guide mechanism of hydraulic cylinder device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a technique which is effective when applied to a guide mechanism of a hydraulic cylinder device having a linear ball bearing which supports a guide rod.

[Conventional technology]

A guide mechanism that uses a hydraulic cylinder device with a guide function such as a linear ball bearing for the purpose of imparting the non-rotating function of the piston rod to the hydraulic cylinder device and suppressing deflection due to the lateral load on the piston rod. is there. For example, the following are the mainstream.

That is, in the guide mechanism of the conventional hydraulic cylinder device, two guide rods are provided in one hydraulic cylinder part, and one guide rod is connected in series along the axial direction.
It is structured to be supported by individual linear ball bearings.

[Problems to be solved by the invention]

However, the guide mechanism of the above-described conventional hydraulic cylinder device has a structure in which one guide rod is axially supported by two linear ball bearings in series along the axial direction. However, there is a problem that the cost is long and the cost is high.

Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to reduce the overall length of the linear ball bearing and reduce the cost without reducing the guide accuracy. An object of the present invention is to provide a guide mechanism for a pressure cylinder device.

[Means for solving the problem]

The outline of a typical invention disclosed in the present application is briefly described as follows.

The guide mechanism of the fluid pressure cylinder device of the present invention includes a guide body with a built-in linear ball bearing having a guide hole extending parallel to the piston rod of the pneumatic cylinder portion, a guide rod sliding in the guide hole, A guide mechanism of a fluid pressure cylinder device including a connection plate for connecting a guide rod and a piston rod, wherein the ball is accommodated in an axial direction on an inner peripheral surface of the guide hole of the linear ball bearing. A front-end linear guide groove and a rear-end linear guide groove are provided, and a front-end ball annular groove corresponding to the front-end linear guide groove and a rear-end ball annular groove corresponding to the rear-end linear guide groove are provided. A ball annular groove for two bearings with a groove is provided, and the guide rod is supported by one linear ball bearing. .

[Action]

According to the guide mechanism of the hydraulic cylinder device of the present invention,
A ball ring groove for two normal bearings is provided on the inner peripheral surface of the guide hole of the linear ball bearing, and the guide rod is supported by this one linear ball bearing. In addition, the overall length of the linear ball bearing can be shortened, and the cost can be reduced.

The above and other objects and novel features of the present invention are as follows.
It will be apparent from the description of this specification and the accompanying drawings.

〔Example〕

FIG. 1 is a half sectional view showing a guide mechanism of a hydraulic cylinder device according to one embodiment of the present invention, and FIG. 2 is a half sectional view showing details of a linear ball bearing shown in FIG.

The guide mechanism of the fluid pressure cylinder device according to the present embodiment is applied to a pneumatic cylinder device.

This pneumatic cylinder device includes a pneumatic cylinder unit 1 and a guide mechanism 2. The pneumatic cylinder unit 1 has a cylinder body 4. A cylinder chamber is formed inside the cylinder body 4, the rod cover 3a, and the head cover 3b, and a piston rod 12 to which a piston sliding in the cylinder chamber is fixed penetrates the rod cover 3a and projects to the rod side. I have.

Supply / discharge ports 17a, 17b are formed in the covers 3a, 3b, and these supply / discharge ports 17a, 17b communicate with left and right cylinder chambers partitioned by pistons.

The guide mechanism 2 guides the piston rod 12 in the axial direction, and has a guide body 5. A piston rod 12 penetrates a rod hole 6 formed at the center of the guide body 5 and protrudes toward the rod.

The guide body 5 has a symmetrical structure in which a shaft hole 7 is formed on both sides thereof and extends in parallel with the piston rod 12, and a linear ball bearing 8 is fitted in the shaft hole 7. The linear ball bearing 8 has a guide hole 9, and two sets of a plurality of ball annular grooves 10 are provided on the inner peripheral surface of the guide hole 9 along the axial direction at equal intervals in the circumferential direction. ing.

That is, as shown in FIG. 2, a linear guide groove 20 including a front end linear guide groove 20a and a rear end linear guide groove 20b is provided on the inner peripheral surface of the guide hole 9,
These linear guide grooves 20a and 20b on both front and rear sides
Are separated by Each linear guide groove 20a,
A ball annular groove 10a on the tip side and a ball annular groove 10b on the tip side are provided on the inner peripheral surface of the guide hole corresponding to 20b, and the linear ball bearing 8 having the ball annular grooves 10 for two bearings is provided. A guide rod 11 is pivotally supported.

The linear ball bearing 8 has two axially extending bearings.
Compared to linear ball bearings connected in series, this is composed of only one. Therefore, the overall length of the linear ball bearing 8 is larger than that of the conventional one,
It is shortened by the length of the snap ring groove for retaining, such as 10, etc.

The distal ends of the two guide rods 11 which are supported by the linear ball bearing 8 and slide in the axial direction are connected to both sides of the connection plate 13 via connection screws 14, respectively. The distal end of the piston rod 12 is connected to the center via connection screws 15 and 16, and has an idling prevention structure.

Reference numeral 18 denotes a mount hole formed in the guide body 5.

 Next, the operation of the present embodiment will be described.

When air is supplied to and discharged from the supply / discharge ports 17a and 17b, the piston rod 12 reciprocates together with the piston by the air pressure in the left and right cylinder chambers, and accordingly, the guide rod 11 reciprocates via the connection plate 13.

Thus, the piston rod 12 and the guide rod 11
Reciprocate together, but in this embodiment, the guide rod is provided by a linear ball bearing 8 provided in the axial direction.
Since the shaft 11 is supported, the idling of the piston rod 12 can be prevented, and the piston rod 12 is not easily bent even when a lateral load is applied.

In addition, although the overall length of the linear ball bearing 8 is shorter than that of the conventional one, there is no reduction in guide accuracy.

Therefore, in the axial direction, the linear ball bearing 8
Is sufficient, the cost can be reduced.

As described above, the invention made by the present inventors has been specifically described based on the embodiments. However, the present invention is not limited to the above embodiments, and it can be said that various modifications can be made without departing from the gist of the invention. Not even.

For example, in the above-described embodiment, a case was described in which a pair of linear ball bearings and two guide rods were provided. However, the present invention is not limited to this, and a case in which one linear ball bearing and one guide rod were provided. Can also be applied.

In the above description, the invention made mainly by the present inventor has been described with reference to the guide mechanism of a hydraulic cylinder device that operates by pneumatic pressure, which is its application field, but the invention is also applied to the guide mechanism of a hydraulic cylinder device that operates by hydraulic pressure. be able to.

[Effect of the invention]

The effects obtained by typical ones of the inventions disclosed in the present application will be briefly described as follows.

(1). In the inner peripheral surface of the guide hole of the linear ball bearing, a ball annular groove for two normal bearings is provided.
Since the guide rod is supported by the linear ball bearings, the overall length of the linear ball bearing can be shortened and the cost can be reduced without reducing the guide accuracy.

[Brief description of the drawings]

1 is a half sectional view showing a guide mechanism of a hydraulic cylinder device according to one embodiment of the present invention, and FIG. 2 is a half sectional view showing details of a linear ball bearing shown in FIG. DESCRIPTION OF SYMBOLS 1 ... Pneumatic cylinder part, 2 ... Guide mechanism, 3a ... Rod cover, 3b ... Head cover, 4 ... Cylinder main body, 5 ... Guide body, 6 ... Rod hole, 7 ... Shaft hole, 8
…… Linear ball bearing, 9 …… Guide hole, 10 ……
Ball annular groove, 11 Guide rod, 12 Piston rod, 13 Connection plate, 14 Connection screw, 15 Nut, 16 Nut, 17a Supply / discharge port, 17b Supply / discharge Port, 18 ... Mount hole.

Claims (1)

(57) [Scope of request for utility model registration] 1. A guide body having a built-in linear ball bearing having a guide hole extending parallel to a piston rod of a pneumatic cylinder portion, a guide rod sliding in the guide hole, and the guide rod and the piston rod. A guide mechanism for a fluid pressure cylinder device comprising: a connecting plate to be connected; and a linear guide groove on a distal end side for axially separating an inner peripheral surface of the guide hole of the linear ball bearing and accommodating a ball. A bearing 2 having a rear end side linear guide groove, and a front end side ball annular groove corresponding to the front end side linear guide groove, and a rear end side ball annular groove corresponding to the rear end side linear guide groove. A guide mechanism for a fluid pressure cylinder device, wherein a plurality of ball annular grooves are provided, and a guide rod is supported by one linear ball bearing.