JP2607031Y2 - Cylinder - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder having a caulking structure for preventing deformation of a caulking portion.

[0002]

2. Description of the Related Art A conventional caulking cylinder shown in FIGS. 4 and 5 is composed of a cylinder 2 having a supply / discharge port P1, P2 and a piston 2 connected to a piston rod 11.
1 is slidably mounted. A bearing housing 13 is provided on one side of the cylinder tube 10 shown in FIG. 5, and a bearing 20 and a shaft seal member 12 are mounted on the inner periphery in this order from the inside in the axial direction. The piston rod 11 is penetrated through the bearing housing 13, and the piston rod 11 is slidably supported by the bearing 20.

An annular groove 14 is formed on the outer periphery of the bearing housing 13 as described above, and a step 15 is formed between the annular groove 14 and the tip of the bearing housing 13. Further, a seal groove 16 is formed inside the step portion 15, and a seal member 18, for example, an O-ring is mounted in the seal groove 16. In order to mount the bearing housing 13 on the cylinder tube 10 as described above, the cylinder tube 10 is inserted until the tip of the cylinder tube 10 contacts the step 15 of the bearing housing 13. After inserting the cylinder tube 10 into the bearing housing 13 in this manner,
An external force is applied to a portion corresponding to the annular groove 14 in the cylinder tube 10 to plastically deform the portion, and the caulking portion 17 is immersed in the annular groove 14, and the bearing housing 13 is connected to the cylinder tube 10.

In the caulking portion 17 as described above, a portion of the annular groove 14 where both upper corners of the annular groove 14 bite into the base portion 1.
7a. As described above, the cylinder tube 10
When the bearing housing 13 is mounted on the seal member 18, the seal member 18 is crushed, and the seal member 18 comes into close contact with the cylinder tube 10 and the seal groove 16 due to its compression reaction force, and exhibits a sealing function. Reference numeral 19 in the drawing denotes an O-ring provided to prevent leakage from inside the cylinder to the outside.

When the pressure oil is supplied to, for example, P2 while the cylinder is in the state shown in FIG. 4, the piston 21 moves leftward in the drawing by the action of the pressure oil.
The piston 21 that moves as described above is the bearing housing 1.
3, the cylinder 21 stops moving when the piston 21 comes into contact with the bearing housing 13. When the pressure oil is supplied to the supply / discharge port P1 in the state where the cylinder is extended as described above, the piston 21 moves rightward in the drawing, and the cylinder returns to the contracted state shown in the drawing.

[0006]

In the above-described conventional cylinder having a caulked structure, the material of the bearing housing 13 is mainly iron. This is because strong iron was used to give the caulking portion 17 a bonding force. However, for example, vehicles such as freight cars are equipped with various cylinders, and there is a problem in that the weight of these mounted objects reduces the load weight of luggage and the like. Therefore, to reduce the weight, the bearing housing 1
When one or both of the bottom member 3 and the bottom member are made of a light alloy such as aluminum, the annular groove 1
Since the fourth side is soft, the base portion 17a of the annular groove 14 is deformed due to pressure changes or vibrations repeatedly acting on the hydraulic cylinder. Therefore, there is a problem that the bonding strength is reduced. An object of the present invention is to provide a lightweight cylinder having a large coupling force in a cylinder having a caulking structure.

[0007]

In order to achieve the above object, a lightweight cylinder according to the present invention comprises a bearing housing on one side of a cylinder tube in which a piston is slidably provided. A step is formed at the tip, an annular groove is formed inside the step, a seal groove is formed closer to the step than the annular groove, and a seal member is attached to the seal groove. It is assumed that the cylinder has a caulking structure in which the cylinder tube is caulked while the tip of the cylinder tube is caulked, and the caulking portion is immersed in the annular groove. Under the premise of the above-mentioned cylinder, the present invention forms the bearing housing with a light alloy, and further, in the annular groove of the bearing housing of the light alloy, at least the inner groove side surface among the opposed groove side surfaces. The present invention is characterized in that a strength member made of a material having higher strength and less ductility than a light alloy is provided, and the strength member reaches the bottom surface of the annular groove and comes into contact with the caulked portion of the cylinder tube.

[0008]

The present invention is constructed as described above, so that it is possible to reduce the weight of the cylinder and to prevent a decrease in the coupling force.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment according to the present invention shown in FIG.
A bearing housing 13 is provided on one side of the cylinder tube 10, and a bearing 20 and a shaft seal member 12 are mounted on the inner periphery in this order from the inside in the axial direction. The piston rod 11 is penetrated through the bearing housing 13 and the piston rod 11 is slidably supported by the bearing 20 in the same manner as in the related art.

At this time, in order to reduce the weight of the cylinder, the bearing housing 13 is formed of a light alloy such as aluminum. Then, since the bearing housing 13 is formed of a light alloy, the strength is lower than that of the iron housing. Therefore, when an external force is applied to that portion of the cylinder tube 10 corresponding to the portion having the annular groove 14 inside, and the caulking operation is performed, the external force must be smaller than when caulking an iron-made one. This is due to the strength and ductility of the light alloy that is the material,
This is because it cannot withstand the external force during swaging.

When an internal pressure is generated in the caulked cylinder, the cylinder tube 10 and the bearing housing 13
A force that separates each other occurs in the diameter direction. If the two begin to separate under the action of this force, the contact area between the bearing housing 13 and the cylinder tube 10 will decrease. Further, the load is concentrated on the base 17a of the caulked portion. Then, the base 1
7a is gradually deformed. And this base 17a
When is deformed, this connection due to the immersion of the caulking portion 17 gradually weakens the bonding force. Therefore,
The use of a material that is as light as aluminum but of low material strength cannot increase the bonding force. the above
The annular groove 14 of the caulking portion 17 is deformed as shown in FIG.
Force between the cylinder tube 10 and the bearing housing 13
When the pressure becomes weak, the cylinder tube 10
It is easy to fall out. On the other hand, the cylinder tube 10
The tip is in contact with the step 15 of the bearing housing 13
Therefore, the cylinder tube 10 comes out to the step portion 15 side.
Never. Therefore, the cylinder tube 10
Is the inner groove side surface 14a in the opposite direction to the tip.
It becomes easy to slip in the direction. Direction of this inner groove side surface 14a
Is the direction in which the cylinder tube 10 comes off.

Therefore, in order to enhance the coupling force, a strength member 1 such as iron is provided in an annular groove 14 formed in the bearing housing 13. The strength member 1 is an annular plate having a width corresponding to the depth of the annular groove 14 formed in the bearing housing 13. The strength member 1 is provided on the groove side surface 14 a of the annular groove 14 . The side of the groove 14a faces in the direction
Corresponding to Then, the cylinder tube 10 is caulked. Thus, the bearing housing 13 is formed.
Inner groove side surface 14a of the groove side surfaces in the formed annular groove 14
By providing the strength member 1 on the
Can be prevented. Thus, deformation in the detaching direction can be prevented.
Then, it becomes difficult for the cylinder tube 10 to come off. Or
Even if a force is applied at the time of crimping, the base 17a of the caulking portion 17
In the cylinder tube 10, the strength portion is
This is because the material 1 has penetrated. In the second embodiment shown in FIG. 2, the shape of the strength member 1 in the first embodiment is changed. That is, set so along an annular strength member 2 in an L-shaped groove side surface 14a of the annular groove 14, the groove bottom surface 14b
Only to have.

Other than the above, it is exactly the same as the first embodiment, so that the same components as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. The third shown in FIG.
In the embodiment, the shape of the strength member 1 in the first embodiment is changed. That is, the annular strength member 3 having a concave cross section
The groove side surface 14a, the groove bottom surface 14b, and the groove side surface 1 of the annular groove 14.
4c. Except for the above, it is exactly the same as the first embodiment, so the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0014]

According to the lightweight cylinder of the present invention, the weight of the cylinder can be reduced because the material of the bearing housing is made of a light alloy. As a result, even in a vehicle such as a freight car on which various cylinders are mounted, the weight of these mounted objects can be reduced, and the load weight of luggage and the like can be increased. Further, by providing the strength member in the annular groove, it is possible to prevent deformation of the base in the annular groove, which has been a problem when a non-ferrous material is used for the bearing housing . Strength on inner groove side
In particular, by providing a member,
This prevents deformation of the inside of the annular groove, which is the removal direction.
Swelled. Therefore, the cylinder tube is
It became difficult to get out of the groove.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a main part showing a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part showing a second embodiment of the present invention.

FIG. 3 is an enlarged sectional view of a main part showing a third embodiment of the present invention.

FIG. 4 is a sectional view showing a conventional example of the present invention.

FIG. 5 is an enlarged sectional view of a main part of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Strength member 2 Strength member 3 Strength member 10 Cylinder tube 11 Piston rod 12 Shaft seal member 13 Bearing housing 14 Annular groove 14a Groove side surface 14b Groove bottom surface 14c Groove side surface 15 Step 16 Seal groove 17 Caulking 17a Base 18 Seal member 19 O Ring 20 Bearing 21 Piston P1 supply / discharge port P2 supply / discharge port

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16J 10/00 F15B 15/14 370

Claims (1)

(57) [Scope of request for utility model registration] A bearing housing is provided on one side of a cylinder tube in which a piston is slidably provided, a step is formed at a tip of the bearing housing, and an annular groove is formed inside the step, and an annular groove is provided. A seal groove is formed closer to the step, and a seal member is attached to the seal groove, and while the tip of the cylinder tube is in contact with the step, the cylinder tube is swaged and swaged into the annular groove. The bearing housing is formed of a light alloy in a cylinder having a caulking structure in which a portion is immersed. Further, in the annular groove of the light alloy bearing housing, the light alloy Provide a strength member made of a material that is greater in strength and less malleable than
A cylinder in which the strength member reaches the bottom surface of the annular groove and contacts the caulked portion of the cylinder tube.