KR101994654B1 - Stopper structure of an actuator piston assembly - Google Patents

Abstract

The present invention relates to a stopper of an actuator piston assembly capable of preventing abrasion or deformation due to abutment between a piston made of different materials and a housing by forming a stopper part integrally with a cover made of a steel material and constituting a ring- Structure.
To this end, the stopper of the actuator piston assembly of the present invention includes an actuator piston assembly for selectively positioning the rail shaft in a neutral position, a position spaced apart from the neutral position in one direction, or another position spaced apart from the neutral position in the other direction 1. A stopper structure comprising: a housing assembly made of aluminum and formed of a housing having a groove portion and a cover for closing the groove portion, the aluminum housing forming a closed space; A rail shaft having a small diameter portion having a diameter smaller than the diameter of the shaft portion, the rail shaft being formed at one side end thereof, and the boundary between the shaft portion and the small diameter portion being located in the closed space; And a piston made of a steel material inserted and assembled into the small-diameter portion so as to partition the closed space into one chamber and the other chamber, wherein a stopper portion for restricting the movement position of the piston in the one- And a ring-shaped stopper made of a steel material is provided on the bottom surface of the groove portion of the housing to restrict a movement position of the piston in the other direction.

Description

STOPPER STRUCTURE OF AN ACTUATOR PISTON ASSEMBLY [0002]

The present invention relates to a stopper structure of an actuator piston assembly, and more particularly, to a stopper structure of an actuator piston assembly, in which a stopper portion is integrally formed with a cover made of steel and a ring-shaped stopper made of steel, To a stopper structure of an actuator piston assembly.

Gear change mechanical transmissions having a double-acting clutch mechanism with both synchronous and asynchronous are known in the prior art.

On the other hand, as can be seen from U.S. Patent Nos. 4,899,607, 4,928,544, 4,936,156, 5,054,591, 5,193,410, 5,263,379, 5,272,441 and 5,329,826, Fluid operated actuator piston assemblies and associated actuator systems are also known in the prior art and are incorporated herein by reference in their entirety.

Although fluidically actuated transmission shift actuators of the prior art are widely used, they can not constitute selectable and maintainable intermediate positions (i. E., Neutral and disengaged positions) for some examples, are complicated in structure and costly, As it requires two or more control sources and their associated control devices, and / or does not selectively provide actuating forces that can vary when moving between different selection positions.

For example, as shown in Fig. 1, the three-position piston described in U.S. Patent No. 5,661,998 is used to obtain an intermediate position, that is, a neutral state in which neither splitter gear is engaged.

This neutral state allows the shifted gear set to achieve synchronous speed with the mating component (sliding clutch) and provides a very smooth shift.

This intermediate position, that is, the neutral position, can be obtained by applying a constant pressure signal to the pressure receiving surface of the small-diameter piston on the side of the splitter cylinder and applying a lower pressure to the pressure receiving surface of the large-diameter piston.

The above-described low pressure can be obtained by pulse width modulation (PWM) of a solenoid valve that applies a pressure to the rear side of the piston. This pulse width modulation requires a rapid on / off change of the 3-way, 2-position solenoid control valve to obtain either pressure between 0 psi (0 Pa) and the system voltage.

Therefore, the system drawback of the prior art has a problem that it is difficult to use the control method for the vehicular transmission because the range of the PWM control value for obtaining the neutral state as a result is small.

In addition, there is a problem that operating variations such as temperature, voltage, pressure, confinement, and manufacturing tolerances of both the solenoid valve and the splitter piston all affect the range of the PWM control value that causes neutralization.

U.S. Patent No. 5,661,998 (Registered on September 29, 1997)

SUMMARY OF THE INVENTION [0006] In order to solve the above problems, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a stopper for a motor vehicle, And it is an object of the present invention to provide a stopper structure of an actuator piston assembly capable of preventing wear and deformation.

According to an aspect of the present invention, there is provided a stopper structure for an actuator piston assembly, the stopper structure including a neutral position, a first position spaced apart from the neutral position, or a second position spaced apart from the neutral position, Wherein the stopper structure of the actuator piston assembly comprises: a housing assembly formed of an aluminum material, the housing assembly including a housing having a groove portion and a cover closing the groove portion, the housing assembly forming a closed space; A rail shaft having a small diameter portion having a diameter smaller than the diameter of the shaft portion, the rail shaft being formed at one side end thereof, and the boundary between the shaft portion and the small diameter portion being located in the closed space; And a piston made of a steel material inserted and assembled into the small-diameter portion so as to partition the closed space into one chamber and the other chamber, wherein a stopper portion for restricting the movement position of the piston in the one- And a ring-shaped stopper made of a steel material is provided on the bottom surface of the groove portion of the housing to restrict a movement position of the piston in the other direction.

Preferably, the one-side chamber and the other-side chamber are connected to one inlet / outlet passage through which the fluid is introduced / discharged.

Preferably, the sleeve may have a diameter equal to the diameter of the shaft portion, and may be inserted into the small diameter portion to apply a fixing force to prevent the piston from being separated.

Preferably, both side surfaces of the piston are formed to have the same area, and the volume of the one chamber and the volume of the other chamber may be the same.

Preferably, at one end of the rail shaft, a locking nut may be fastened to prevent the sleeve from being discharged and to provide a pressing force so that the sleeve presses the piston.

Preferably, a force pushing the rail shaft toward the other side is generated by a fluid pressurized to one side of the piston exposed to the pressurized fluid in the one chamber, and a pressing force is applied to the other side of the piston exposed to the pressurized fluid in the other chamber. So that a force pushing the rail shaft to one side is generated.

Preferably, the corresponding portion of the small-diameter portion into which the piston is inserted may be formed with a tight contact portion that closely contacts the insertion port of the piston, and a spaced portion that is spaced apart from the insertion port of the piston.

Preferably, the corresponding portion of the small-diameter portion into which the sleeve is inserted may be provided with a tight contact portion closely contacting the insertion port of the sleeve, and a spaced portion spaced apart from the insertion port of the sleeve.

As described above, according to the present invention, since the stopper portion is integrally formed with the cover made of steel and the ring-shaped stopper made of steel is constituted, it is possible to prevent abrasion or deformation due to contact between the piston made of different materials and the housing There is an advantage.

The hydraulic pressure acting on both side surfaces of the piston is the same, so that the hydraulic pressure acting on both side surfaces of the piston is the same. The volume of the chambers are the same so that the response speed is the same. , The one-way position, and the other position.

In addition, since the fluid is supplied or discharged through a single inlet / outlet passage to each of the chambers for operating the piston, the structure of the housing can be simplified.

1 is a configuration diagram showing a schematic configuration of a conventional gear change mechanical transmission.
2 is a perspective view illustrating an actuator piston assembly according to an embodiment of the present invention.
3 is an exploded perspective view illustrating an actuator piston assembly according to an embodiment of the present invention.
FIG. 4 is an operation diagram illustrating an actuator piston assembly according to an embodiment of the present invention.
5 is an operation diagram illustrating an actuator piston assembly according to an embodiment of the present invention.
6 is a partial cross-sectional enlarged view of an actuator piston assembly according to one embodiment of the present invention.
7 is a view illustrating a stopper provided in a housing of an actuator piston assembly according to an embodiment of the present invention.

The present invention may be embodied in many other forms without departing from its spirit or essential characteristics. Accordingly, the embodiments of the present invention are to be considered in all respects as merely illustrative and not restrictive.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms.

The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, .

On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present application, the terms "comprises", "having", "having", and the like are intended to specify the presence of stated features, integers, steps, operations, components, Steps, operations, elements, components, or combinations of elements, numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like or corresponding elements are denoted by the same reference numerals, and a duplicate description thereof will be omitted.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

An actuator piston assembly according to an embodiment of the present invention includes an actuator piston assembly for selectively positioning a rail shaft in a neutral position, at one side spaced from the neutral position in one direction, or at another position spaced apart from the neutral position in the other direction, to be.

The actuator piston assembly of the present embodiment is configured to include a pair of rail shafts operated by the same operation principle. Hereinafter, components related to one rail shaft will be described by way of example.

3 is an exploded perspective view illustrating an actuator piston assembly according to an embodiment of the present invention. FIG. 4 is a cross-sectional view of an actuator piston assembly according to an embodiment of the present invention. FIG. 5 is an operation diagram illustrating an actuator piston assembly according to an embodiment of the present invention, and FIG. 6 is a side view of the actuator piston assembly according to an embodiment of the present invention. FIG. 7 is a view illustrating a stopper provided in a housing of an actuator piston assembly according to an embodiment of the present invention. FIG. 7 is a partial sectional enlarged view of an actuator piston assembly according to an embodiment of the present invention.

The actuator piston assembly includes a housing assembly 100, a rail shaft 200, a piston 300, a sleeve 400, and a fixing nut 500, as shown in FIGS.

First, the housing assembly 100 will be described.

The housing assembly 100 is a portion in which the actuator piston assembly of the present embodiment forms a hydraulic working space for varying the rail shaft 200 from the neutral position to the one side position or varying the neutral position to the other position by the hydraulic pressure .

The housing assembly 100 is configured to form a closed space S for hydraulic actuation.

Specifically, the housing assembly 100 includes a housing 101 formed with a groove 101h and a cover 103 closing the groove 101h.

The cover 103 can be assembled to the inlet side of the groove portion 101h in a state where the cover 103 is prevented from being separated by the snap ring SR provided on the inner side wall of the groove portion 101h of the housing 101, And an O-ring O may be provided between the outer circumferential surface of the housing 101 and the inner circumferential surface of the housing 101.

On the other hand, a step is formed on the entrance side of the groove portion 101h in which the cover 103 is assembled, so that the cover 103 can be assembled and fixed in a state of tightly adhering by the snap ring.

The actuator piston assembly of this embodiment is provided with a pair of grooves 101h formed independently of each other in the housing 101 so as to individually operate the pair of rail shafts 200, And a pair of covers 103 for closing the respective openings 101h.

The closed space S formed by the housing assembly 100 is divided into the one chamber 110S and the other chamber 120S by the piston 300 and the fluid is supplied to the chambers 110S and 120S And the piston 300 will be described in detail with reference to FIG.

A ring-shaped stopper 101S for restricting the movement of the piston 300 in the other direction is provided on the bottom surface of the groove 101h of the housing 101. On the inner surface of the cover 103, A stopper portion 103S for limiting the movement direction of one side of the first and second guide portions 300 and 300 is integrally protruded.

The housing 101 is formed of an aluminum material and the cover 103, the rail shaft 200, the piston 300, the sleeve 400, etc. are formed of a steel material in order to reduce the weight of the actuator piston assembly of the present embodiment .

Here, the piston 300 comes into contact with the ring-shaped stopper 101S when the piston 300 is moved to the other side, and comes into contact with the inner portion of the cover 103 when the piston 300 moves in one direction. The housing 103 is made of the same steel material as the piston 300 and relatively strong against abrasion or deformation when the piston 300 is in contact with the piston 300. Since the housing 101 is likely to be abraded or deformed, Shaped stopper 101S made of a steel material on the bottom surface of the groove portion 101h of the housing 101 to prevent wear and deformation of the housing 101. [

Next, the rail shaft 200 will be described.

The rail shaft 200 is a portion for shifting the fork F provided at the other end portion as the neutral position, one side position, and the other side position are varied by the actuator piston assembly of this embodiment.

The rail shaft 200 is formed as a generally cylindrical shaft and includes a shaft portion 210 and a small diameter portion 220 having a diameter smaller than the diameter of the shaft portion 210 at one end of the shaft portion 210 .

At this time, the boundary portion between the shaft portion 210 and the small diameter portion 220 of the rail shaft 200 is positioned corresponding to the closed space S of the housing assembly 100.

The piston 300 and the sleeve 400 are assembled to the small diameter portion 220 and a corresponding portion of the small diameter portion 220 into which the piston 300 is inserted is inserted into the center hole And a first spacing portion 200B spaced apart from a center hole of the piston 300. The sleeve 200 is formed with a first small diameter portion 200A that is in close contact with the small diameter portion 220, A second abutting portion 200C that is in close contact with the center hole of the sleeve 400 and a second spacing portion 200D that is spaced apart from the center hole of the sleeve 400 are formed.

The first tight contact portion 200A and the first spaced portion 200B are formed by inserting the piston 300 into the first tight contact portion 200A of the small diameter portion 220 and assembling the piston 300, Only a part of the center holes are assembled to the first tight contact portion 200A, thereby improving the assemblability and preventing deformation of the rail shaft 200, which may occur during assembly.

The second tight contact portion 200C and the second clearance portion 200D are formed such that when the sleeve 400 is inserted and assembled into the second tight contact portion 200C of the small diameter portion 220, Only a part of the center holes are assembled to the second contact portion 200C, thereby improving the assemblability and preventing deformation of the rail shaft 200 that may occur during assembly.

Next, the piston 300 will be described.

The piston 300 is inserted into and assembled to the small diameter portion 220 so as to partition the closed space S of the housing assembly 100 into one chamber 110S and the other chamber 120S, And the areas of both side surfaces are formed to have the same area.

Specifically, a center hole is formed at the center of the piston 300, inserted into the small-diameter portion 220 of the rail shaft 200, and tightly fitted to the first tightening portion 200A. One surface of the piston 300 is in close contact with a step surface formed at a boundary portion between the shaft portion 210 of the rail shaft 200 and the small diameter portion 220.

Meanwhile, the piston 300 is assembled at a position where the volume of the one chamber 110S and the volume of the other chamber 120S are equal to each other, in a state where the actuator piston assembly according to the embodiment of the present invention is in the neutral position .

The inlet and outlet passages 110h and 120h through which the fluid can be supplied or discharged to the one chamber 110S and the other chamber 120S partitioned by the piston 300 are individually formed.

For example, a first inlet discharge passage 110h through which the fluid flows into and out of the one chamber 110S is formed, and a second inlet discharge passage 120h through which the other chamber 120S is introduced and discharged is formed .

A piston seal PS and an O-ring O may be provided between the outer circumferential surface of the piston 300 and the inner circumferential surface of the housing 101.

Next, the sleeve 400 will be described.

The sleeve 400 is a component that is inserted into the small diameter portion 220 side so that the piston 300 is not separated from the small diameter portion 220. The outer diameter of the sleeve 400 is smaller than the diameter of the shaft portion 210 of the rail shaft 200 As shown in FIG.

The outer diameter of the sleeve 400 is formed to be the same as the diameter of the shaft portion 210 of the rail shaft 200 so that the hydraulic pressure acting on both sides of the piston 300 is formed to be the same .

In order to prevent the sleeve 400 from being discharged to the outside and to provide a pressing force to press the piston 300 on the sleeve 400, The fixing nut 500 is fastened.

An O-ring O may be provided between the inner circumferential surface of the sleeve 400 and the outer circumferential surface of the rail shaft 200.

Next, the operation of the actuator piston assembly of the present embodiment configured as described above will be described.

A fluid pressurized through the second inlet / outlet passage 120h flows into the first chamber 110S and the second chamber 120S at a neutral position where no fluid pressure acts on the first chamber 110S and the second chamber 120S, When the fluid in the one chamber 110S is discharged through the first inlet / outlet passage 110h and the piston 300 and the rail shaft 200 Is moved toward the one chamber 110S side.

That is, the pressing force is applied to the other side of the piston 300 exposed to the pressurized fluid in the other chamber 120S to generate a force pushing the rail shaft 200 to one side, The fork F provided at the other end of the hinge 200 slides in one direction to perform shifting.

Next, a fluid pressurized through the first inlet / outlet passage 110h flows into the first chamber 110S and the second chamber 120S at a neutral position where no fluid pressure acts on the first chamber 110S and the second chamber 120S, When the fluid in the other chamber 120S is discharged through the second inlet / outlet passage 120h due to the fluid pressure acting on the side surface of the piston 300 and the oil pressure acting on the piston 300 due to the hydraulic pressure acting on the piston 300, 200 move toward the other chamber 120S.

That is, a force pushing the rail shaft 200 to the other side is generated by the fluid pressurized to one side of the piston 300 exposed to the pressurized fluid in the one chamber 110S, The fork F provided at the other end of the hinge shaft 200 slides in the other direction to perform shifting.

Although the present invention has been described with reference to the preferred embodiments thereof with reference to the accompanying drawings, it will be apparent to those skilled in the art that many other obvious modifications can be made therein without departing from the scope of the invention. Accordingly, the scope of the present invention should be interpreted by the appended claims to cover many such variations.

100: housing assembly 101: housing
101S: Stopper 101h: Groove
103: Cover 103S: Stopper
110h: first inlet discharge passage 120h: second inlet discharge passage
110S: one chamber 120S: the other chamber
200: rail shaft 200A: first tightening part
200B: first spacing portion 200C: second tightening portion
200D: second spacing portion 210: shaft portion
220: Small diameter part 300: Piston
400: Sleeve 500: Fixing nut
S: Closed space

Claims (8)

A stopper structure of an actuator piston assembly for selectively positioning a pair of rail shafts from a neutral position, one side position spaced apart from the neutral position in one direction, or the other position spaced apart from the neutral position,
A housing having a pair of grooves formed independently of each other and a pair of covers each closing the pair of grooves in a state in which the rail shaft passes therethrough, A housing assembly made of aluminum to form a space;
A pair of rail shafts formed at one end of the small diameter portion having a diameter smaller than the diameter of the shaft portion and each of which is configured to be positioned in a pair of closed spaces in which a boundary between the shaft portion and the small diameter portion is formed independently of each other;
And a pair of pistons made of steel and inserted and assembled into the small-diameter portion so as to partition the closed space into one chamber and the other chamber,
A stopper portion for limiting a movement position of the piston in one direction is integrally formed on an inner side portion of the cover, and a ring-shaped stopper made of steel is provided on a bottom surface of the groove portion of the housing to restrict a movement position of the piston in the other direction,
Wherein a stepped portion is formed on an inlet side of each of the grooves to which the covers are assembled and each of the covers is assembled and fixed in a state of being in tight contact with the stepped portion by a snap ring provided on an inner wall of an outer side of each of the grooves. Stopper structure of piston assembly. The method according to claim 1,
And one inlet / outlet passage through which the fluid is introduced / discharged is connected to the one chamber and the other chamber, respectively. The method according to claim 1,
Further comprising: a sleeve having a diameter equal to the diameter of the shaft portion and having a diameter greater than the diameter of the shaft portion, the sleeve being inserted into the small diameter portion so as to prevent the piston from being separated from the shaft portion. The method according to claim 1,
Wherein an area of both side surfaces of the piston is formed to have the same area, and a volume of the one side chamber and that of the other side chamber are the same. The method of claim 3,
Wherein a lock nut is fastened to one end of the rail shaft to prevent the sleeve from being discharged and to provide a pressing force so that the sleeve presses the piston. The method according to claim 1,
A force pushing the rail shaft to the other side is generated by a fluid pressurized to one side of the piston exposed to the pressurized fluid in the one chamber and a fluid pressurized to the other side of the piston exposed to the pressurized fluid in the other chamber Wherein a force for pushing the rail shaft toward one side is generated by the stopper mechanism of the actuator piston assembly. The method according to claim 1,
Wherein a corresponding portion of the small diameter portion into which the piston is inserted is formed with a tight contact portion that closely contacts the insertion port of the piston and a spaced portion that is spaced apart from the insertion port of the piston. The method of claim 3,
Wherein a corresponding portion of the small diameter portion into which the sleeve is inserted is formed with a tight contact portion closely fitted to the insertion port of the sleeve and a spaced portion spaced apart from the insertion port of the sleeve.

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