JPH0356732A - Two-stage operating stay damper - Google Patents

Abstract

PURPOSE:To enable two-stage operation of a stay damper by a method wherein a rod body is slowly stretched by movement of luid with opening of a back door of a hatch-back vehicle and temporarily suspended when a check seal comes in sliding contact with a cylinder small diameter part. CONSTITUTION:With opening of a back door, a rod body 2 stretches from the inside of a cylinder body 1 by gas pressure so that a hydraulic oil in a rod side oil chamber A flows through a piston part 3 into a piston side oil chamber B while being attenuated to stretch slowly. Then, when a check seal 4 comes into sliding contact with a cylinder small diameter part 10, the stretching is temporarily suspended by the sliding resistance and stagnation of the hydraulic oil in a chamber C. When external operating force is applied to the rod body 2, the check seal 4 retreats by a stopper member 6 via a spring 5 so that a bypass path L provided on the rod body 2 is opened thereby enabling further stretching of a stay damper. Thus two-stage opening of the back door is possible.

Description

[Detailed Description of the Invention] [Field of Application of Industry L] This invention is most suitable for assisting the opening/closing operation of the hack door in a hatchback vehicle, and is especially suitable for starting the retracting operation from the fully extended state or its approximate state. The present invention relates to a two-stage operating state bar that can temporarily stop the contraction operation and is optimal for preventing the back door from slamming or unexpectedly falling.

(Prior art and its problems) Traditionally, the back door of a hatchback car has been equipped with a stator bar to assist in opening and closing the door. When fully extended, the back door is maintained in a fully open state, and is easily retracted by external forces such as the 3T product or wind force. It is assumed that the backdoor is configured so as not to operate in the closing direction. Therefore, it is possible to adopt a means of setting the gas pressure inside the stay damper high so that a large contraction force, that is, thrust II force can be exerted when the stay damper is fully extended. Adopting such a means would make it impossible to extend the stay damper in two stages, that is, to open the hack door in two stages. In other words, in recent years, this type of Suda Damba is equipped with a hack door that can be flipped up high and opened fully so that it does not get in the way of loading and unloading luggage. On the other hand, it is necessary that the back door be formed in a so-called half-open state before the fully open state, so that even a person of short stature can easily reach the tip of the back door when opening the back door. It is desired that the form be as impressive as possible. Therefore, in recent years, in this type of stage bar,
During the extension operation, a temporary stop function is activated, which can temporarily stop the opening of the back door of a hatchback vehicle before the back door is fully opened. mchi,
A two-step stay bar has been proposed that can temporarily stop the extension operation of the stay bar and enable the two-step opening operation of the pack door. Conventionally, for example, within the telescopic operation area, between the rod body and the cylinder body through which it is inserted,
The cylinder body of the rod body is rotated by rotating the rod body side or cylinder body side about the axis of the stay damper, or by rotating a member arranged on the rod body side or cylinder body side. There are various proposals, such as making it possible to prevent the projecting or spreading of pigeons. However, in the conventional two-stage operation stay damper such as the one shown in L, the structure for two-stage operation requires a so-called stopper function in the external structure, resulting in an unnecessary increase in the number of parts. or increase the bulk of the stage bar itself.
It had some drawbacks, such as being stretched. This invention was invented in view of the above-mentioned circumstances, and its purpose is to provide a hack-to-lock system for hatchback vehicles without unnecessary increase in the number of parts or bulkiness of the vehicle itself. An object of the present invention is to provide a two-stage operating stay damper which enables a two-stage opening of the lever and temporarily prevents the start of its contraction operation from the maximum extension time or an approximate time thereof. [Means for Solving the Problems] In order to solve the object in E, the two-stage operating stay damper according to the present invention has a structure that includes a cylinder body, a loft body inserted into the cylinder body so as to be retractable, and a loft body inserted into the cylinder body so as to be retractable. The rod body has a piston part at the tip of the rod body which slides inside the cylinder body, and the cylinder body has a small diameter part which makes the inner diameter of the cylinder body small. It has a check seal interposed on the outer periphery and a spring that energizes the check seal, and the tip of the spring is adjacent to the base end of the check seal, and both ends of the spring are on the side of the piston part. The check seal is locked to a stopper member fixed to the outer periphery of the rod body so as to face each other, and when the rod body is retracted into the cylinder body, the outer lip of the check seal touches the inner periphery of the small diameter part. It is characterized in that it is formed in such a way that its contraction can be prevented by being brought into close contact with each other. This two-stage action stay damper has a free piston slidably in a piston-side oil chamber in the cylinder body, and a gas chamber defined by the free piston. This is done by using gas pressure to bias the stay damper in an elongated direction. Further, this two-stage actuation stay damper is formed so that a predetermined damping force can be generated in the piston portion when the piston portion slides within the cylinder body. On the other hand, in this two-stage action stay damper, the small diameter part of the cylinder body is formed by reducing the diameter of the thick part near the open end of the cylinder body from the outside, or It is assumed that this effect is achieved by placing a collar member around the inner circumference near the opening end. Also, the smell of this 22-stage operation state bar is 'C, Chie.
It is assumed that the noxeal and the spring are installed directly on the outer periphery of the @ part of the rod body, or on the outer periphery of a collar member that is attached to the spigot part of the rod body so as to be in series with the piston part.

And this two-stage action stay damper is on the rod side inside the cylinder body when the check seal is in sliding contact with the small striking part?
It is formed on the open end side of the cylinder body, which is a chamber partitioned by the check seals described above, and is formed so that the hydraulic oil stagnates in the chamber. In addition, this two-stage stay damper has the advantage that when the check seal overcomes the biasing force of the spring and is retracted,
The so-called bypass passage bored in the loft body or the collar member is shaped so as to be open, and the hydraulic oil in the rod side oil chamber is transferred to the container side through the open high bus passage. It is formed so that C can flow into it. It is also assumed that this two-stage actuating stay damper is brought into contact with a shoulder member disposed at the tip of the check seal or on the side of the piston section.

(Function) When the hatch door in the hatchback is opened, the rod body protrudes from the cylinder body due to the biasing force in the extension direction due to the gas pressure in the stay damper, and its extension operation becomes possible. Become. In this case, the hydraulic oil from the rod-side oil chamber in the cylinder passes through the piston and flows into the piston-side oil chamber in the cylinder, and at this time, a predetermined amount of damping force is applied to the piston. generated and is responsible for its relatively slow elongation action. On the other hand, in the piston-side extraction chamber, the gas chamber defined by the free piston swells, and the free piston is moved to eliminate the shortage of hydraulic oil in the piston-side oil chamber. For the above-mentioned extension operation, a check seal is provided on the outer circumferential side of the rod body or formed on the inner circumferential side of the cylinder body at a predetermined point, that is, in a specific stroke region. W1 comes into contact with the small t\ portion, and its extension operation is temporarily stopped due to the sliding resistance at that time. That is, when the check seal comes into sliding contact with the small diameter portion, the flow of hydraulic oil that was previously free between the check seal and the inner periphery of the large diameter cylinder body is stopped. As a result, the check seal and the cylinder body [$lrl]
Hydraulic oil is temporarily stagnated in the chamber formed between the end side and the stay damper's extension action. When an external operating force is applied to the loft body, depending on the direction of the operating force, for example, in the direction in which the stay damper is extended, the check seal will move backward relative to the loft body, and until then, the check seal will The closed bypass passage is opened, and the hydraulic oil in the L storage chamber flows out to the rod-side extraction chamber in the cylinder body, making it possible to further extend the stay damper. In other words, two-stage operation is possible when the stay damper is extended. ·direction,. When the operating force acts in the direction indicated by E or the direction in which the stay damper is contracted, the outer peripheral lip of the check seal that was in WJ contact with the small diameter portion of the cylinder body separates from the small diameter portion indicated in 1, and moves toward the loft side indicated by L. Hydraulic oil from the oil chamber side flows into the chamber and causes the stay damper to contract. (Example) Hereinafter, based on the illustrated example, 9. The details will be explained in detail.

As shown in the first question, the two-stage operating stay damper of the one-cusped embodiment of the present invention includes a cylinder body 1, a rod body 2 inserted into the cylinder body 1 so as to be retractable, and a tip end of the rod body 2. A piston part 3 is connected to the piston part 3 and moves in layers within the cylinder 1 body. The cylinder 1 has a small diameter part 10 on the right, which is a small diameter part 10 in the vicinity of the open end 1a, which is the left end in the figure, and the inner diameter is reduced over an appropriate section at the point a. In this embodiment, the small diameter portion 10 is formed by reducing the diameter of the thick wall portion of the cylinder body l indicated by -L from the outside thereof. On the other hand, the cylinder 1 has a bearing member 7 and an oil seal 8 passed in series around the inner periphery of the open end 1a so as to close the open end.
At the same time, the bearing member 7 and the oil seal 8
It is assumed that the rod body 2 is slidably passed through the axis of the rod. Further, the cylinder 1 has an annular stopper 9 crimped and fixed to the inner periphery of the cylinder near the open end 1a. The annular stopper 9 has an inner circumference and a rod body 2.
has an appropriate gap h between the outer periphery of the gap 9a and the outer periphery of the
This allows the insertion of a stop member 6 disposed on the loft body 2, which will be described later. The free piston is placed in a layered motion in the oil chamber B on the piston side, and a gas chamber defined by the free piston is placed on the right, and the stay damper is extended by the positive gas in the gas chamber. This two-stage actuating stay damper is formed so as to energize the tendency. When the piston part 3 moves WI within the cylinder body l, the damping valve O disposed in the piston part 3 acts as a damper. On the other hand, in this embodiment, the rod body 2 has a check seal 4 interposed directly on the outer periphery of its shaft portion 2a, and a A spring 5 urges the seal 4 in the forward direction, which is rightward in the drawing.The tip 5a of the subring 5 is adjacent to the base end 4a of the check seal 4, and the spring 5 is Base end 5
b is locked to the stop flange member 6. Further, the tip 4b of the check seal 4 is connected to the valve stopper 3l in the piston portion 3 and the stepped portion 2 of the loft body 2.
The stopper member 32, which is formed in a #I cylindrical shape and is held between the stopper member 32 and the stopper member 32, is in contact with the stopper member 32 at the contact/separation point. Furthermore, the outer debris lip portion 4c of the check seal 4 is
This is the gap when the rod body 2 is extended from inside the cylinder l. It is formed so as to be in sliding contact with the inner periphery of the small diameter portion 1O in the most extended state shown in the figure or in an extended state close to this, and at the time of this sliding contact, the extension operation of the stay damper is temporarily caused. It is formed to be stopped. Therefore, in this two-stage action stay damper, when the outer circumferential lip 14c of the check seal 4 comes into sliding contact with the inner circumference of the small diameter part A chamber C separated by the check seal 4 is formed on the open end la side of the cylinder body l, and the chamber C
It is formed so that hydraulic oil is stagnated inside. Furthermore, this two-stage operating stay damper, as shown in Figure 2,
When the check seal 4 overcomes the force of the spring 5 and is moved back, the notch 1 opened in the rod body 2
The bypass passage L consisting of l2c is formed so as to be open, and the hydraulic oil in the rod side oil chamber A flows into the chamber C through the opened bypass passage L. It's been done. Therefore, in the rod body 2 according to the present invention, the outer periphery of the shaft portion 2a is formed to have excellent sliding properties, and in this embodiment, it is chrome plated. ．． The stop flange member 6 has a flange portion 6a against which the eighth end 5b of the spring 5 comes into contact, and
It has a notched hole 6b that allows hydraulic oil to pass through the pocket 6a, and is fixed to the outer periphery of the shaft 2a of the rod body 2 by appropriate means such as projection welding. Therefore, the two-stage operating stay damper according to the present invention formed as shown below operates as follows. For example, when the hatch door of a hatchback vehicle is taken with the hatch open, when the stay damper is extended, the lock 1 and Body 2 begins to protrude, and its extension action is actively disguised. Well, t'l from the rod side oil chamber A in the cylinder body l.
J) J oil passes through the piston part 3 and flows into the piston side oil chamber B in the cylinder body l, and at this time, the oil of a predetermined size is
IJ. A damping force will be generated, and its relatively slow extension operation will be possible. At this time, in the piston side oil chamber B, the gas chamber defined by the free piston (not shown) swells and moves the free piston, causing the screw 1 to move.
Eliminate the shortage of hydraulic oil inside the tank.

When the above-mentioned extension operation is performed with a certain stroke, the check seal 4 located on the outer circumference of the shaft portion 2a of the rod body 2 comes into sliding contact with the small fLlo formed on the inner circumference of the cylinder body 1. At that time, the sliding resistance causes the extension operation to be temporarily stopped. That is, as shown in FIG. 3, the outer lip portion 4C of the check seal 4 is attached to the inner circumference of the small diameter portion 10. When contacting
The hydraulic oil, which had previously been free to flow between the check seal 4 and the inner periphery of the large-diameter cylinder body 1, tends to flow into the flow. As a result, the hydraulic oil is temporarily stagnated in the chamber C defined at the open end taa of the cylinder body l by the check seal 4, and the extension operation of the stay damper is temporarily prevented. That will happen. When an external operating force is applied to the rod body 2, depending on the direction of the operating force, for example, in the direction in which the slide damper is further extended, the outer circumferential lip fi4c of the check seal 4 is moved. It so-called inclines inward, forming a gap between the outer periphery of the outer periphery lip portion 4c and the inner periphery of the small f section 10, and stagnates in the 12th storage chamber C through the entire slave space. This causes the hydraulic oil that had been in the loft side to flow out into the loft side oil chamber A, preventing further extension of the stay damper.
Make it. In other words, when the stay damper reaches its maximum extension state, the outer periphery of the rod Pll2a of the rod body 2 is The stopper member 6, which is fixed to At this time, the check seal 4 is in a forward position relative to the rod body 2, and the bypass path L is kept closed, so that the stay damper is maintained in the fully extended state.On the other hand, From the most extended state 1!i of the stay damper shown in FIG. The outer circumference m4c of the seal 4 tends to come into contact with the above-mentioned small }Wlll', and therefore, the chamber C is not refilled with hydraulic oil from the rod side oil chamber A side, and the chamber C A so-called negative pressure is generated inside the stay damper, and the contraction operation of the stay damper becomes ill.
It will be stopped. Then, the stay damper is retracted by an even greater external force!
When operated, as shown in FIG. 2, the check seal 4 is so-called retracted with respect to the rod body 2, opening the bypass path L that was previously closed by the check seal 4.
This allows the hydraulic oil in the rod-side oil chamber A to flow into the chamber C, allowing the stator to contract. Furthermore, the contraction operation indicated by L is possible even when the stay damper is in a state approximating its fully extended state, that is, in a so-called half-open state before the back door of a hatchback vehicle is fully opened. ．． FIG. 4 shows the bypass path L formed in the rod body 2 in the above-mentioned embodiment, and it is assumed that this consists of the notched groove 2c, whereas as shown by the broken line in the figure, It may also consist of a notch 2d. FIG. 5 shows a two-stage operating stay damper according to another embodiment of the present invention, and the two-stage operating stay damper is basically the same as the embodiment shown in FIG. 1 described above. It is said that it is formed in Therefore, the same reference numerals are given to the same constituent parts in the drawings, and a detailed explanation thereof will be omitted, and the following explanation will focus on the differences. That is, in the two-stage effect stay damper according to this embodiment, the small diameter portion IO formed on the cylinder body 1 side is a stopper which is fixed to the inner periphery of the vicinity of the open end 1a of the cylinder body 1. 9, and the extended portion 9b is formed by being present on the inner peripheral side of the cylinder body l. That is, in the two-stage operating stay damper according to this embodiment, the cylinder body l is not reduced in diameter from the outer circumferential side, but is formed with a small diameter portion IO. In addition, in the two-stage operation stay damper according to this embodiment, the bypass path L is connected to the vertical hole 2C bored in the axial center of the rod body 2, and the vertical hole 2C, as shown in FIG. The upper end of the vertical hole 2c, which is the right end in the figure, is connected to the piston side oil chamber in the cylinder body l. In contrast, the outer circumferential end of the horizontal hole 2f opens into the rod-side oil chamber A in the cylinder body l, and the open end is closed by a check seal 4. The inner periphery of the upper end of the extended portion 9b, which is the right end in the figure, is a so-called tapered surface 9C, and when the stay damper is in the maximum compression state, the outer circumference of the check seal 4 is 4c. It is designed so that it can easily enter the small diameter part 10 formed by the extension part 9b. In addition, the bypass path L in this embodiment is the rod body 2.
Although it is assumed that the hole is formed by a vertical hole 2e and a horizontal hole 2f which are bored in the hole, it may be formed by a cutout hole 2C or a cutout portion 2d in the embodiment shown in FIG. 1 described above instead. Therefore, in the case of this embodiment, the small diameter
Since it is possible to form an IO, there is an advantage that there is no need to change the outer shell of the cylinder body l. FIG. 7 shows a two-stage operating stay damper according to still another embodiment of the present invention, and the two-stage operating stay damper is basically the same as the above-mentioned @lUA embodiment. It is said that it is formed in Therefore, in this embodiment, the same parts of the A-forming members are denoted by the same reference numerals in the drawings, detailed explanation thereof will be omitted, and the following explanation will focus on the different points. That is, in the embodiment shown in 7UA, the check seal 4 and the spring 5, which are interposed on the outer periphery of the rod body 2 constituting the two-stage operation stay damper, are connected to the piston part 2g of the rod body 2. The feature is that it is interposed on the outer periphery of the collar member 20 arranged in series with the collar member 3. That is, the collar member 20 is formed into a ↑1-shaped body with a flange, and a rod body 2 is attached to aIila of the main body portion 20a.
The flange 20b abuts against the step zb of the body 20b, and has a bypass path L formed by a notch [ZOc''% on the outer periphery of the main body 2[1a]. 20b is a stopper, and the f end is the left end face in the figure, and W+ is on the upper end face of the stopper 9, which is the right end face in the figure.
It is said that he will be attacked. Further, the collar member 20 has its tip guided into the stopper member 32, and is locked to the piston portion 3, that is, at the spigot portion 2g of the rod body 2, at the loft. It is assumed that it is held between the stepped portion 2b of the body 2 and the piston portion 3. Therefore, in this embodiment, the barrel portion 2a of the rod body 2
Of course, fixing the stopper member 6 to the outer periphery is omitted. The flange portion 20b is formed with a notch 20d, and the spigot portion 2g is formed with an annular groove 12h, and within the annular groove 2h is the collar 20d. A seal 21 is arranged in close contact with the inner periphery of the main body part 20a of the member 2B. By the way, in this embodiment as well, the cylinder body l has a small diameter portion IO, or in this embodiment, the diameter reduced portion for forming the small diameter portion IO is It is distinctive in that it extends from the vicinity of the open end Ia of the cylinder body l to the open end PJla. However, in the two-stage operating stay damper according to the present invention, if the intention is to set the Q/E in the chamber C to be small by increasing the diameter of the rod body 2, the As shown by the broken line [A, the inner diameter of the open end fila side of the cylinder body l is smaller than the inner diameter of the small diameter portion IQ,
That is, the outer diameter of the open end 1a is made larger than the outer diameter of the small diameter section IO. Of course, it is okay to die. Therefore, in this embodiment, since the high bus path L is formed on the outer periphery of the collar member 20, the collar member 20
The bypass path L can be changed by simply changing the bypass path L, that is, the characteristics of the latter stroke of the two-stage operating stay damper according to the present invention can be changed, and the opening end all of the cylinder body l can be changed.
By selecting the inner diameter of la and the diameter of loft body 2, there is an advantage that the so-called holding force at the time of extension can be selected. (Effects of the Invention) As described below, according to the present invention, the slide damper for assisting the opening/closing operation of the hack door in a hatchback vehicle can of course be used to open the back door in two stages. In particular, there is an advantage that the manufacturing process does not lead to an unnecessary increase in the number of waste materials, and furthermore, the stage damper itself does not become bulky.

According to the present invention, when an external force such as snow accumulation or wind force acts in a direction to contract the check seal from its most extended state or from its approximate state, the outer lip of the check seal This tends to be closely connected to the small diameter part of the cylinder body, and as a result, there is no replenishment of hydraulic oil from the rod-side oil chamber in the container, creating a so-called negative pressure in the container. There is an advantage in that the contraction action is inhibited. Further, according to the present invention, a check seal is provided on the loft body side that slides into contact with the small diameter part by the force of providing a small f part with a small inner diameter at an arbitrary location on the cylinder body side, and in particular, the extension thereof is Operation In particular, by bringing a check seal into contact with the small diameter part described in (h), and by letting the hydraulic oil stagnate in the chamber defined by the check seal on the open end side of the cylinder body, the state chamber is activated. The effects of Nakanaga-saku -・
Since it was assumed that the IL was temporarily stopped, the backdoor':. There is also the advantage that the desired double-stage opening operation can be performed safely and reliably by the function of the internal mechanism without requiring any so-called work by the user PI, etc., in addition to performing the double-stage opening operation.

[Brief explanation of drawings]

FIG. 1 is a partial longitudinal sectional view showing the main parts of a two-stage operating state tamper according to an embodiment of the present invention, FIGS. 2 and 3 are partial longitudinal sectional views showing its operating state, and FIG. 4 5 is a cross-sectional view of the rod body, FIG. 5 is a longitudinal cross-section IA showing the stomach part of a two-stage operating stay damper according to another embodiment of the present invention, and FIG. 6 is a cross-sectional view of the rod body. FIG. 7 shows a block diagram according to still another embodiment of the present invention. It is a half-cut partial vertical cross-sectional view showing the main part of the stage operation stator member.
Rod body 2a...Shaft part 2g...Part of spigot 3...Piston part 4...Check seal
4a, 5b... base end 4b, 5a... tip
4c...Outer lip portion 5...Spring 5a
... Tip 6.32 ... Stopper member lO ... Small diameter part 2o ... Collar member A.
...Rod side oil chamber B...Piston side oil chamber C...
Room L... High pass road agent person Burrishiten

Claims (1)

[Claims] It has a cylinder body, a rod body inserted into the cylinder body so as to be retractable, and a piston part connected to the tip of the rod body and sliding within the cylinder body, and the cylinder body has an inner diameter. The rod body has a small diameter portion to make the diameter small, and the rod body has a check seal interposed on its outer periphery and a spring that biases the check seal, and a spring is provided at the proximal end of the check seal. When the rod body is inserted into the cylinder body, the tip of the spring is adjacent to the stopper member fixed to the outer periphery of the rod body so that the base end of the spring faces the piston part. A two-stage operating stay damper characterized in that the outer peripheral lip of the check seal is formed in close contact with the inner periphery of the small diameter portion during the contraction operation to prevent the contraction operation.