JP2000065010A - Variable stroke fluid cylinder device - Google Patents

Abstract

(57) Abstract: A stroke adjustment can be performed quickly, easily and precisely in a fluid cylinder device itself, and there is no need to provide a special external adjustment mechanism for the stroke adjustment. Therefore, the structure is simple and inexpensive. And a small and lightweight fluid cylinder device which is excellent in mountability to a vehicle or the like. SOLUTION: A movable cylinder end wall is screwed to one end in a piston sliding direction of a cylinder body in which a piston which slides in response to a fluid pressure is stored, and a screwing position of the cylinder end wall is set. The adjustment is made so that the piston stroke can be adjusted. By screwing a lock nut to the outside of the movable cylinder end wall in the axial direction of the piston, the movable cylinder end wall is fixed at that position after adjusting the screwing position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable stroke fluid cylinder device.

[0002]

2. Description of the Related Art Conventionally, in a vehicle such as a truck, a piston is driven by using a pressurized fluid such as compressed air or pressure oil as a working medium, and various operated members connected to the piston, for example, in an exhaust passage of an engine. 2. Description of the Related Art A fluid cylinder device as an actuator that operates an exhaust brake valve, a shift fork of a transmission, or the like that is interposed in a vehicle to generate a braking effect is known.

[0003] The above-mentioned conventional fluid cylinder device is generally an essentially constant-stroke type device in which a piston stored in a cylinder is capable of performing a sliding displacement for a certain distance in the cylinder. On the other hand, the fluid cylinder device and the operated members such as the exhaust brake valve and the shift fork of the transmission have manufacturing errors and assembly errors which are unavoidable in terms of manufacturing technology themselves, and temperature changes during use. Alternatively, there is a dimensional change due to wear over time, and further, there is a relative mounting error with the cooperating fluid cylinder device.

Therefore, any means for absorbing the manufacturing error and the mounting error, and the dimensional change due to thermal expansion or contraction, abrasion, etc., between the operated member and the fluid cylinder device for operating the member. Conventionally, as disclosed in, for example, JP-A-6-330770, an error absorbing device is provided at a connecting portion between a piston shaft forming an output member of a fluid cylinder device and a member to be operated. The configuration provided is known. (Hereinafter, in some cases, the device described in the above publication is referred to as a previously proposed device.)

The configuration of the above-mentioned proposed device will be described with reference to a plan view of FIG. 4 and a perspective view of FIG. In the figure, reference numeral 01 generally indicates an air cylinder device that operates using compressed air as a working medium.
And a piston 03 slidably housed in the same cylinder. A piston shaft 04 having one end fixed to the piston 03 and extending outside the cylinder 02 forms an output member of the air cylinder device 01. The air cylinder device 01 is mounted on the substrate or the base plate 05 by bolts or other fixing means (not shown).

[0006] The tip of the piston shaft 04 is formed as a square shaft portion 04 'having a rectangular cross section.
A pair of link arms 07 are pivotally connected by bolts 06 near the free end of the tip 4 ', and a long hole 08 is formed near the end of the same-shaft shaft portion 04' on the cylinder 02 side. A bifurcated one end 010 of a Y-shaped drive lever 09 is pivotally connected by a bolt 011 near an end of the pair of link arms 07 on the cylinder 02 side.
Reference numeral 11 is inserted through the long hole 08 of the square shaft portion 04 '.

The other end 012 of the drive lever 09 has
A drive shaft 013 for operating an operated member, for example, an exhaust brake valve (not shown) of the exhaust brake device is connected. On the other hand, on the base plate 05, a bottom portion 015 of a stroke regulating plate 014 having a U-shaped planar shape is provided.
Mounted by two bolts or screws 016.
The bolt or screw 016 is inserted into a long hole 017 provided on the bottom portion 015 and having a long diameter extending in a direction parallel to the axis of the piston shaft 04.

Accordingly, after the bolt or screw 016 is loosened and the stroke regulating plate 014 is displaced to a desired position in the axial direction of the piston shaft 04, the bolt or screw 01 is again moved.
6, a pair of parallel leg portions 01 protruding from both ends of the bottom portion 015 of the stroke regulating plate 014.
The relative positions of the pistons 8a and 018b with respect to the air cylinder device 01 in the axial direction of the piston can be changed.

In the state shown by the solid line in FIG. 4 and shown in FIG. 5, compressed air is supplied to the left side chamber of the piston of the air cylinder device 01, the right side chamber of the piston is communicated with the atmosphere, and the piston 03 is moved to the right stroke end. In the vicinity and therefore the piston shaft 04
Is moved rightward and retracted into the cylinder 02. At this time, the retracted position of the piston shaft 04 is such that the end of the pair of link arms 07 on the cylinder side is the stroke regulating plate 0.
14 is determined by abutting one of the legs 018b.

Next, on the contrary, when compressed air is supplied to the right chamber of the piston 03 and the left chamber of the piston is communicated with the atmosphere, the piston 03 slides in the cylinder 02 to the left. As a result, the left end of the pair of link arms 07 is connected to the other end of the stroke regulating plate 014, as shown by the two-dot chain line in FIG. Is determined by contact with the leg portion 018a.

The Y-shaped drive lever 09 rotates through a pair of link arms 07 due to the contraction and extension displacement of the piston shaft 04, and the drive shaft 013 is driven. Is determined by the distance L between the pair of legs 018a and 018b of the stroke regulating plate 014, and is constant. Therefore, the bolt or screw 0
16, the stroke L of the piston shaft 04 is unchanged even if the stroke regulating plate 014 is moved left and right within the range of the length of the long hole 017, and only the start position and the end position of the stroke change. In other words, in other words, the drive shaft 013
Is constant, but only the rotation start position and the rotation end position change.

In the air cylinder device 01 cooperating with the stroke regulating plate 014, the maximum sliding stroke of the piston 03 is a constant stroke slightly larger than the above-mentioned stroke L (at least the length of the elongated hole 017 in the axial direction of the piston). That is, it is an air cylinder device having a normal structure having a stroke which is larger by an adjustment margin). In addition, a stopper bolt (not shown) for limiting the extension stroke of the piston shaft 04 by abutting on the free end surface of the piston shaft 04 or the distal end surface of the link arm 07 on the leg portion 018a of the stroke regulating plate 014. The stroke L itself can be changed by screwing and controlling the screwing position, but the air cylinder device 01 has the above-described normal structure.

In the above-mentioned proposed device, the adjustment of the rotation angle phase or the rotation angle of the drive shaft 013 for driving the operated member such as the exhaust brake valve, that is, the stroke adjustment is provided outside the air cylinder device 01 with an extremely complicated structure. And a pair of link arms 07, a Y-shaped drive lever 09, bolts 06, 011 and 016, etc., so that a space for arranging these members is required, and space limitation is required. In the case of trucks and other vehicles with severe requirements, there is a problem that it is difficult to obtain an installation space, and since the structure is complicated and the number of parts is large, manufacturing costs are high, and it is difficult and troublesome to perform precise stroke adjustment work. There are inconveniences such as requiring a large work cost.

[0014]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned drawbacks of the above-mentioned device, has a small space limitation when mounted on a vehicle such as a truck, has a simple structure, is low in manufacturing cost, and has a small stroke adjustment. It is an object of the present invention to provide a variable stroke fluid cylinder device that can be easily and accurately performed.

[0015]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a cylinder body containing a piston which slides in response to fluid pressure, and an end of the cylinder body in the piston sliding direction. And a movable cylinder end wall capable of adjusting a sliding stroke of the piston by adjusting a screwing position thereof. .

According to the configuration of the present invention, the sliding stroke of the piston and the piston shaft connected to the piston can be easily and accurately adjusted by the fluid cylinder device itself. Since no special member for adjustment is required, there are few restrictions on the arrangement space, and there are advantages of light weight and low cost.

Further, in the present invention, a non-circular hole for screwing operation is recessed on the outer surface of the movable cylinder end wall in the cylinder axial direction, and the movable cylinder is screwed to an end of the cylinder body. It is preferable to provide a structure having a lock nut for fixing the end wall to the screwed position, and this structure makes it possible to easily and easily perform a stroke adjusting operation, and to accurately hold the adjusted stroke. There is.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be specifically described below with reference to FIGS. Symbol 1 in the figure
Numeral 0 indicates a fluid cylinder device, in the illustrated case, an air cylinder device using compressed air as a working medium, and the air cylinder device 10 has a cylinder hole 14 in which a piston 12 is slidably accommodated. And a cylinder body 16.

A piston shaft 20 whose one end is tightened by a nut 18 is fixed to the piston 12, and the piston shaft 20 is a fixed cylinder end integrally formed at one end of the cylinder body 16. It extends through the wall 22 to the outside. In the above-mentioned extension of the piston shaft 20,
A shift fork 24 of the transmission is fixed as an operated member, and the shift fork 24 is
Drive. Reference numeral 28 is a sleeve stopper that cooperates with the sleeve 26.

An opening 30 communicating with the cylinder hole 14 is provided at the other end of the cylinder body 16, and a female screw 32 is formed on the inner peripheral surface of the opening 30. A male screw 36 engraved on the outer peripheral surface of the large-diameter portion 34a at the outer end in the piston axial direction of the movable cylinder end wall 34 that closes the cylinder hole 14 is screwed into the female screw 32. At the outer end of the large-diameter portion 34a, for example, a non-circular hole 38 having a hexagonal shape is formed in a concave shape. The non-circular hole 38 is used for screwing the movable cylinder end wall 34 into the cylinder main body 16. The tool application hole is formed.

The piston 12 of the movable cylinder end wall 34
A groove 40 is provided on the outer periphery of the small-diameter portion 34b on the side, and the groove 40 communicates with the cylinder hole 14 through one or more communication holes 42 extending in the radial direction. A disk-shaped lock nut 46 in which a male screw 44 screwed to the female screw 32 is engraved on the outer peripheral surface of the movable cylinder end wall 34 in the piston axial direction is screwed to the lock nut 46. For example, a hexagonal non-circular hole 48 to which a tool is applied at the time of the screwing operation is formed.

The cylinder body 16 is provided with a first air supply / discharge port 50 which is always in communication with the concave groove 40 provided in the movable cylinder end wall 34, and is always provided on the fixed cylinder end wall 22 side. A second air supply / discharge port 52 communicating with the piston right side chamber of the cylinder hole 14 is provided. Female screw 32 engraved in the cylinder body opening 30
Is provided so as to cover all screwing positions of the movable cylinder end wall 34 necessary for absorbing a positional error of the shift fork 24 as the operated member, and 40 has a width in the piston axial direction such that it always communicates with the first air supply / discharge port 50 at all screwing depth positions of the movable cylinder end wall 34, that is, at any adjustment position in the piston axial direction. Therefore, when the movable cylinder end wall 34 is screwed, the first air supply / discharge port 50 always communicates with the left piston chamber regardless of the position.

The first air supply / discharge port 50 is connected to a compressed air source or an air tank 56 via a first electromagnetic three-way valve 54, and the second air supply / discharge port 52 is connected via a second electromagnetic three-way valve 58. Connected to the compressed air source or the air tank 56. Reference numeral 60 denotes a ring-shaped plastic stopper member provided at the end of the movable cylinder end wall 34 facing the piston 12 in the cylinder hole 14;
Reference numeral 2 denotes a ring-shaped plastic stopper member interposed in the cylinder hole 14 so as to abut against the fixed cylinder end wall 22. Reference numeral a denotes the piston 12, the piston shaft 20, the movable cylinder end wall 34 and the like, and the cylinder hole 14, the piston. It is an air seal interposed between a shaft sliding hole and the like. In addition, 6
Reference numeral 4 denotes a bolt for fixing the cylinder body 16 to a suitable mounting member such as a transmission casing.

In the air cylinder device 10, the second
The electromagnetic three-way valve 58 is energized to supply the compressed air in the air tank 56 from the second air supply / discharge port 52 to the piston right chamber, and the first electromagnetic three-way valve 54 is deenergized to communicate the piston left chamber to the atmosphere. Then, as shown in FIG.
The piston 12 moves to the left in the cylinder hole 14 and is displaced to the left stroke end in contact with the stopper member 60. Due to the leftward movement of the piston 12, the shift fork 24 fixed to the extension of the piston shaft 20 moves leftward, and the sleeve 26 is displaced toward the sleeve stopper 28.

At this time, when the shift fork 24 presses the sleeve 26 against the sleeve stopper 28, at least one of the shift fork 24 and the cooperating sleeve 26 is worn. It is necessary that a slight clearance be formed between the sleeve and the sleeve 26.

Conversely, the first electromagnetic three-way valve 54 is energized to supply the compressed air in the air tank 56 from the first air supply / discharge port 50 to the left side chamber of the piston, and the second electromagnetic three-way valve 58 Is deenergized and the right piston chamber is opened to the atmosphere via the second electromagnetic three-way valve 58, the piston 12 moves rightward from the leftward movement position shown in FIG. Displaced toward the end of one stroke. The rightward movement of the piston 12, and thus the piston shaft 20, causes the shift fork 24 to move rightward and drive the sleeve 26 away from the sleeve stopper 28.

The components such as the cylinder body 16 and the piston 12 which constitute the air cylinder device 10 and the transmission components such as the shift fork 24 and the sleeve 26 as the members to be operated are manufactured inevitably in terms of manufacturing technology. There is an error and an assembly error, and an error occurs when the air cylinder device 10 is attached to, for example, a transmission casing. Therefore, due to the accumulation of the manufacturing error, the assembly error, and the attachment error, some troubles such as the shift fork 24 or When the cooperating sleeve 26 is worn, it is necessary to adjust the sleeve 26 so that the sleeve 26 is not pressed against the sleeve stopper 28 at the left-hand stroke end of the piston 12 by appropriate means.
It is not easy to adjust the mounting position of 0 itself or the relative positions of various members on the transmission side, and it requires a great deal of labor.

However, the air cylinder device 10
Since the position of the left stroke end of the piston 12 is determined by the position of the movable cylinder end wall 34 via the stopper member 60, first, a tool that fits into the non-circular hole 48 of the lock nut 46 is inserted and the nut is removed. Loosen, then insert a tool that fits into the non-circular hole 38 in the movable cylinder end wall 34 and rotate the cylinder end wall 34 in the desired direction to bring the position of the left stroke end of the piston 12 to the desired position. After the adjustment, the lock nut 46 may be tightened again to fix the cylinder end wall 34.

At this time, as shown in FIG.
The tool can be applied to the non-circular hole 38 through the non-circular hole 48 by configuring the non-circular hole 38 of the movable cylinder end wall 34 to be included in the area of the non-circular hole 48 of the movable cylinder. At the time of screwing positioning of the end wall 34, there is no need to remove the lock nut 46, and it is sufficient to loosen the lock nut 46 within the range necessary for adjustment.

Position adjustment of the movable cylinder end wall 34,
Therefore, the stroke of the piston 12 is precisely adjusted by the pitch of the male screw 36 on the outer peripheral surface of the cylinder end wall 34 and the female screw 32 on the inner peripheral surface of the opening 30 of the cylinder main body screwed thereto and the rotation angle of the cylinder end wall 34. Since the adjustment is simple and easy, there is an advantage that the working cost of the stroke adjustment work is low and the precise adjustment can be performed quickly and accurately. Further, it is necessary to provide a special stroke adjustment device outside the air cylinder device 10. There is no space problem when mounting the vehicle, etc., and the cylinder end wall 34, which is usually fixed to one end of the cylinder body 16 with bolts or the like, is screwed into the opening 30 of the cylinder body 16 and the lock nut 46 is used. Since it is a fixed structure, there are advantages that the structure is remarkably simple, the manufacturing cost is low, and the weight is low, as compared with the above-mentioned proposed device.

It should be noted that the present invention is not limited to the above-described embodiment, but can be similarly applied to a hydraulic cylinder device using hydraulic oil as a working medium. Other members other than the fork lever 24 described above may be used, for example, an exhaust brake valve in a previously proposed device. Furthermore, although the illustrated embodiment is a double-acting cylinder device, the present invention can also be applied to a single-acting cylinder device in which one-directional displacement of a piston is performed by a spring force.

[0032]

As described above, the variable stroke fluid cylinder device according to the present invention has a cylinder body containing therein a piston that slides in response to fluid pressure, and a piston body in the piston sliding direction of the cylinder body. A movable cylinder end wall that can be screwed to the end and can adjust the sliding stroke of the piston by adjusting the screwing position, and a fluid that is inevitably generated in manufacturing technology. The stroke adjustment required to absorb the accumulation of the manufacturing error and the assembly error of the cylinder device and the cooperating operated member can be performed without providing a special stroke adjustment device outside the fluid cylinder device itself. And can be performed easily, easily, and precisely. Therefore, there are advantages of excellent mountability on a vehicle or the like, simple structure, low cost, and light weight. Further, in the present invention, a non-circular hole for screwing operation is recessed on the outer surface in the cylinder axis direction of the movable cylinder end wall, and the movable cylinder end wall screwed to the end of the cylinder body is screwed with the screw. Providing a lock nut that locks in the mating position has the advantage that stroke adjustment of the fluid cylinder device can be performed quickly and easily and with extremely good workability, and the operation of the lock nut ensures the adjusted stroke. There are advantages that can be retained.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a preferred embodiment of the present invention.

FIG. 2 is a front view showing a movable cylinder end wall extracted from the air cylinder device of FIG. 1;

FIG. 3 shows a lock nut 46 from the air cylinder device of FIG.
It is the front view which extracted and shown.

FIG. 4 is a plan view of a main part showing a device already proposed.

5 is a perspective view of the device shown in FIG.

[Explanation of symbols]

10 ... air cylinder device (fluid cylinder device), 12 ...
Piston, 14: Cylinder hole, 16: Cylinder body, 2
0: piston shaft, 22: fixed cylinder end wall, 24: shift fork (operated member), 26: sleeve, 28 ...
Sleeve stopper, 34 ... movable cylinder end wall, 38 ...
Non-circular hole, 46: Lock nut, 48: Non-circular hole, 50
... first air supply / discharge port, 52 ... second air supply / discharge port.

Claims (2)

[Claims] 1. A cylinder body containing a piston that slides in response to fluid pressure therein, and is screwed to an end of the cylinder body in the piston sliding direction, and the screwing position is adjusted to adjust the screwing position. A movable cylinder end wall capable of adjusting a sliding stroke of a piston. 2. A non-circular hole for screwing operation is recessed on the outer surface of the movable cylinder end wall in the cylinder axis direction,
2. The variable stroke fluid cylinder device according to claim 1, further comprising a lock nut screwed to an end of the cylinder body to fix the movable cylinder end wall at the screwed position.