Buffering oil cylinder for hinge and buffering hinge

Abstract

The utility model relates to the technical field of hinges, in particular to a buffer oil cylinder for a hinge and a buffer hinge, which comprise a cylinder shell, a push rod, an upper spring, a lower spring and an upper cover, the lower spring is abutted between the inner bottom wall of the cylinder shell and a piston, the upper cover and the push rod are coaxially assembled in a sliding manner, and the upper cover is connected with the push rod in a sliding manner. The top wall of the cylinder shell is bent towards the axis of the cylinder shell to be provided with a limiting part, the upper cover is located on the inner side of the limiting part, the upper spring is arranged in the push rod in a sleeved mode, the upper spring is connected between the upper cover and the piston in an abutting mode, and when the buffer oil cylinder is in a reset state, the push rod stretches out of the top wall of the cylinder shell, and the upper cover is located on the top wall of the cylinder shell. The upper spring and the lower spring form a double-spring buffering structure layout, the hinge is buffered in the whole process of opening and closing, the buffering effect is improved, the user experience is improved, the impact noise of the door plate is reduced, the impact force generated when the door plate is closed is reduced, and noise generated when the cabinet door impacts the door plate is reduced to a great extent.

Description

TECHNICAL FIELD

[0001] The utility model relates to hinge technical field especially a buffer oil cylinder and buffer hinge for hinge. BACKGROUND

[0002] Hinge is a mechanical device used to connect two solids and allow relative rotation between the two, commonly used for opening and closing of furniture cabinet doors, in order to improve the user experience, reduce the impact force of the door frame when the door is closed, the market has appeared hydraulic buffer hinge, hydraulic buffer hinge is a kind of hinge that uses hydraulic principle to realize buffer function, mainly composed of hinge body and hydraulic buffer oil cylinder, hydraulic buffer oil cylinder is the core component of hydraulic buffer hinge, responsible for providing buffer damping in the process of opening and closing the door, reducing impact and noise.

[0003] At present, the common hinge buffer oil cylinder on the market generally adopts spring and push rod in the cylinder shell filled with silicon oil, which buffers through spring and silicon oil, and the buffer structure is simple and convenient for production and manufacturing, but the virtual position of the push rod pushing the piston movement is large, generally when the hinge is opened to 45 °, the buffer effect can be produced, the buffer stroke of the hinge is short, if the door is less than 45 ° from closing to opening, the hinge cannot play the effect of buffer closing, the buffer effect is poor, and the situation of the door plate impacting the cabinet and producing noise still exists when the door plate is closed, which affects the user use.

[0004] In the prior art, in order to solve the problem of short hinge buffer stroke, the iron shell small angle hinge buffer of the announcement number CN215565276U, by increasing the tail plug, tail plug ring and compression spring, when the hinge is opened at a small angle, the compression spring produces rebound force, so that the hinge can still produce buffer effect when opened at 5~15 °, the tail plug and tail plug ring play the role of sealing, can isolate the above silicon oil, prevent silicon oil from flowing to the space below, ensure that the compression spring runs in a closed space, bring great convenience to the user.

[0005] In view of the above related art, the inventors believe that the following defects exist: first, because a compression spring is used as a single-side elastic buffer of the piston, the other side of the piston relies on extrusion of silicone oil to obtain a buffering effect, this structure still has a buffering virtual position when the hinge is opened and closed at a small angle (<5-15°), if a user inadvertently opens the cabinet door at a small angle and then releases the hand, or a child is not strong enough to open the cabinet door, in the above special use scenarios, although the opening stroke of the cabinet door is small, the cabinet door will still impact the door panel and generate noise; second, the small-angle hinge buffer has many parts, which increases production and manufacturing costs, a closed space needs to be provided for the compression spring to operate, assembly is difficult, and in the use process, the sealing performance decreases, which can cause silicone oil to penetrate into the assembly space of the compression spring, so that the amount of silicone oil extruded by the piston decreases, thereby affecting the buffering effect and the stability of the buffering effect is poor; third, the structure in which the outer ring wall of the front cover is assembled and connected with the inner ring wall of the shell, in the use process of the hinge, the front cover is pressed by the pressure of the silicone oil, the shell lacks a limiting structure for the front cover, and the front cover is prone to falling off the shell, thereby causing the buffering failure of the buffering hinge. SUMMARY

[0006] To solve at least one of the technical problems in the background art, the present application provides a buffer oil cylinder for a hinge and a buffering hinge.

[0007] In a first aspect, the utility model provides a buffer oil cylinder for a hinge, which adopts the following technical scheme:

[0008] A buffer oil cylinder for a hinge, comprising a cylinder shell and a push rod, the cylinder shell is used for containing silicone oil, one end of the push rod is connected with a piston through a shaft, an outer ring wall of the piston is sleeved with a first sealing ring, and is used for abutting and sealing with an inner wall of the cylinder shell, further comprising an upper spring, a lower spring and an upper cover, the lower spring is abutted between an inner bottom wall of the cylinder shell and the piston, the upper cover is coaxially and slidingly assembled with the push rod, a limiting portion is arranged on a top wall of the cylinder shell towards the shaft center, the upper cover is located on the inner side of the limiting portion, the upper spring is sleeved in the push rod, and the upper spring is abutted between the upper cover and the piston, when the buffer oil cylinder is in a reset state, the push rod extends out of the top wall of the cylinder shell.

[0009] Preferably, the elastic force of the lower spring is greater than that of the upper spring, the upper spring is a cylindrical spring, and the lower spring is an almond-shaped spring.

[0010] Preferably, the inner diameter of the cylinder shell is ∅D, the wire diameter of the upper spring is (7.7-7.8)%*∅D, and the wire diameter of the lower spring is (7-7.2)%*∅D.

[0011] Preferably, the piston is provided with an oil leakage hole, an axis of the oil leakage hole is eccentric to an axis of the piston, the piston is provided with an arc-shaped slot on a side facing the inner bottom wall of the cylinder shell, and the oil leakage hole is in communication with an inner wall of the arc-shaped slot.

[0012] Preferably, the outer ring wall of the piston is provided with an assembly groove for assembling the first sealing ring, the arc-shaped slots are arranged in multiple groups at equal angles along a center of the piston, an inner ring wall of the assembly groove is provided with a through hole in communication with the arc-shaped slots, and the through hole is provided with multiple groups corresponding to the arc-shaped slots.

[0013] Preferably, the push rod is provided with an upper stopper protruding in a radial direction thereof, the upper stopper is located between the piston and the upper spring, an end of the push rod facing the inner bottom wall of the cylinder shell is provided with a lower stopper protruding in a radial direction thereof, and the lower stopper is located between the piston and the lower spring.

[0014] Preferably, an outer diameter of the lower stopper is less than or equal to an inner diameter of a circle surrounded by the multiple groups of arc-shaped slots.

[0015] Preferably, the piston is provided with an annular slot in a top wall thereof, the annular slot is located below the upper stopper, the oil leakage hole is in communication with an inner wall of the annular slot, an outer ring wall of the piston is provided with a cutout in communication with the annular slot, and the cutout is located above the assembly groove.

[0016] Preferably, the outer ring wall of the piston is provided with a plurality of groups of grooves, the grooves are located above the assembly groove, and when the grooves are provided with multiple groups, the multiple groups of grooves are annularly arranged on the outer ring wall of the piston.

[0017] Preferably, the utility model further comprises a second sealing ring and a third sealing ring, the second sealing ring is sleeved on an outer ring wall of the push rod and located between the upper spring and the upper stopper, and the third sealing ring is assembled between the upper cover and the push rod.

[0018] In a second aspect, the utility model provides a buffer hinge, and the following technical scheme is adopted:

[0019] A kind of buffer hinge, including hinge body, above-mentioned one for hinge buffer oil cylinder, the hinge body is equipped with the buffer oil cylinder, the hinge body includes branch, transmission arm, inner rocker, the branch both ends are used to articulate the inner rocker and the transmission arm one end respectively, the distance between the two articulations of the branch is L1, the other end of the transmission arm is articulated with the push rod, the middle part of the transmission arm is equipped with rotating shaft, for articulated with the hinge arm rotation, the distance between the two ends of the transmission arm articulation of the rotating shaft axle is L2, L3, L1: L2: L3=1.65:1:1, the included angle a is formed between L2 and L3, and the included angle a is 150~160 °.

[0020] The utility model discloses the beneficial effects are:

[0021] The buffer structure layout of double spring formed by the upper spring and the lower spring solves the buffer virtual position problem when small-angle opening and closing, obtains the effect of full-range buffering when the hinge opens and closes, improves the buffering effect, improves user experience, reduces the door panel impact noise and reduces the impact force when the door panel closes.

[0022] The upper spring is abutted between the upper cover and the piston, the problem of insufficient unilateral elastic buffering is solved, the effect of bilateral buffering is obtained, the buffering stability is improved, the risk of buffering failure is reduced, the cabinet door can still be buffered when opening small stroke, and the noise generated by the cabinet door impacting the door panel is greatly reduced.

[0023] The limiting portion of the cylinder shell limits the upper cover, the problem that the front cover is easy to fall off is solved, better sealing performance is obtained, the risk of silicone oil leakage is reduced, the reliability of the buffer hinge is improved, and the service life of the buffer hinge is improved.In addition, by simplifying the part structure, the problems of many parts and difficult assembly are solved, the production efficiency is improved, and the production cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is the hydraulic oil cylinder perspective view in the embodiment of the application;

[0025] Figure 2 It is the hydraulic oil cylinder sectional view in the embodiment of the application;

[0026] Figure 3 It is the first local planar view of the hydraulic oil cylinder in the embodiment of the application;

[0027] Figure 4 It is the first local bottom view of the hydraulic oil cylinder in the embodiment of the application;

[0028] Figure 5 It is the second local planar view of the hydraulic oil cylinder in the embodiment of the application;

[0029] Figure 6is a first perspective view of the piston in the embodiments of the present application;

[0030] Figure 7 is a second perspective view of the piston in the embodiments of the present application;

[0031] Figure 8 is a bottom view of the piston in the embodiments of the present application;

[0032] Figure 9 is a perspective view of the hinge in the embodiments of the present application;

[0033] Figure 10 is a top view of the hinge in the embodiments of the present application;

[0034] Figure 11 is Figure 10 a sectional view at A-A in FIG.

[0035] Explanation of Reference Signs: 1, cylinder shell; 101, limiting part; 2, push rod; 201, upper stop; 202, lower stop; 3, piston; 301, oil leakage hole; 302, arc-shaped groove; 303, assembly groove; 304, through hole; 305, annular groove; 306, cutout; 307, recess; 401, first sealing ring; 402, second sealing ring; 5, upper spring; 6, lower spring; 7, upper cover; 801, hinge cup; 802, outer rocker arm; 803, inner rocker arm; 804, hinge arm; 805, base; 806, support arm; 807, transmission arm. DETAILED DESCRIPTION

[0036] This part will describe the specific embodiments of the present application in detail, the preferred embodiments of the present application are shown in the drawings, the role of the drawings is to supplement the description of the text part with figures, so that each technical feature and the overall technical scheme of the present application can be understood intuitively and visually, but it cannot be understood as a limitation on the protection scope of the present application.

[0037] In the description of the present application, if the orientation description such as "up", "down", "front", "back", "left", "right" and the like is indicated, the orientation or positional relationship based on the orientation or positional relationship shown in the drawings is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the present application. When a feature is referred to as "provided", "fixed", "connected" to another feature, it can be directly provided, fixed, connected to the other feature, or indirectly provided, fixed, connected to the other feature.

[0038] In the description of the present application, if it involves "several", the meaning is one or more, if it involves "multiple", the meaning is more than two, if it involves "greater than", "less than", "more than", it should be understood as not including the number, if it involves "above", "below", "within", it should be understood as including the number. If it involves "first", "second", it should be understood as being used to distinguish technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0039] In addition, unless otherwise defined, the technical terms and scientific terms used in the present application have the same meaning as generally understood by those skilled in the art. The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present application. It should be understood that when used in the specification and the appended claims, the terms "include" and "contain" indicate the presence of the described features, whole, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, whole, steps, operations, elements, components and / or their collections.

[0040] Embodiment: as Figures 1-8 shown, a buffer cylinder for a hinge, comprising a cylinder shell 1, a push rod 2, an upper spring 5, a lower spring 6, an upper cover 7, the cylinder shell 1 is used to contain silicone oil, one end of the push rod 2 is connected with a piston 3, the outer ring wall of the piston 3 is sleeved with a first sealing ring 401, and is used to abut and seal with the inner wall of the cylinder shell 1, the lower spring 6 is abutted between the inner bottom wall of the cylinder shell 1 and the piston 3, the upper cover 7 is coaxially and slidingly assembled with the push rod 2, the top wall of the cylinder shell 1 is bent towards its axis to provide a limiting portion 101, the upper cover 7 is located on the inner side of the limiting portion 101, the upper spring 5 is sleeved in the push rod 2, and the upper spring 5 is abutted between the upper cover 7 and the piston 3, when the buffer cylinder is in a reset state, the push rod 2 extends out of the top wall of the cylinder shell 1.

[0041] Under the action of the upper spring 5, the lower spring 6 and the silicone oil, the lower cover abuts on the inner side of the limiting portion 101, thereby sealing the silicone oil. It is worth mentioning that the buffer cylinder in the reset state refers to the state of the push rod 2 without external force, at this time, most or all of the silicone oil is located between the inner bottom wall of the cylinder shell 1 and the piston 3, i.e. the space where the lower spring 6 is assembled.

[0042] The buffer structure layout formed by the upper spring 5 and the lower spring 6 solves the problem of buffer virtual position when opening and closing at a small angle, obtains the effect of full-range buffer when the hinge is opened and closed, improves the buffer effect, improves the user experience, reduces the impact noise of the door panel, and reduces the impact force when the door panel is closed. Secondly, the upper spring 5 abuts between the upper cover 7 and the piston 3, which solves the problem of insufficient unilateral elastic buffer, obtains the effect of bilateral buffer, improves the buffer stability, reduces the risk of buffer failure, can still buffer when the cabinet door is opened at a small stroke, especially in the use scene that the user accidentally opens the cabinet door at a small angle, and then releases the cabinet door when the cabinet door is opened at the moment, or the child releases the cabinet door when the child is not strong enough to open the cabinet door, can buffer the closing of the cabinet door, greatly reduce the noise caused by the impact of the cabinet door on the door panel. Furthermore, the cylinder shell 1 is provided with a limiting portion 101 for limiting the upper cover 7, which solves the problem of easy falling of the front cover, obtains better sealing performance, reduces the risk of silicone oil leakage, improves the reliability of the buffer hinge, and prolongs the service life of the buffer hinge. In addition, by simplifying the structure of the parts, it is not necessary to set an independent spring assembly chamber, which solves the problem of too many parts and difficult assembly, improves the production efficiency, and reduces the production cost.

[0043] In the specific structural design of the upper spring 5 and the lower spring 6, the elastic force of the lower spring 6 is greater than that of the upper spring 5. The upper spring 5 is a cylindrical spring, and the lower spring 6 is an almond-shaped spring. When the hinge is closed, i.e., the door panel is in a closed state, the upper spring 5 is in a reset state, and the lower spring 6 is in a compressed state. When the cabinet door is opened from the closed state, the upper spring 5 is transformed from the reset state to the compressed state, and the lower spring 6 is transformed from the compressed state to the reset state. At this time, when the cabinet door is opened at a small angle, the hinge needs to add the mass of the cabinet door. By adopting the elastic force of the lower spring 6 greater than that of the upper spring 5, the closing of the cabinet door is buffered more effectively. By the double-spring design, the elastic buffer virtual position when opening and closing at a small angle is reduced, the force distribution is more uniform, the consistency of the buffer is improved, and the full-range elastic buffer of the hinge is realized. Secondly, the cylindrical upper spring 5 has high stability and uniform force output, which provides stable pressure for the upper part of the buffer cylinder. The structure is simple, and the production and assembly are convenient. The almond-shaped lower spring 6 can provide greater elastic force under the same size, which is suitable for providing stronger buffer force at the bottom of the buffer cylinder to solve the buffer demand when opening and closing at a small angle. At the same time, the special shape of the almond-shaped lower spring 6 can better adapt to the space at the bottom of the cylinder shell 1, improve the space utilization efficiency, and complement the characteristics of the two springs to better meet the buffer demand of the hinge at different opening angles, realize the full-range buffer effect, optimize the cost and performance while ensuring the buffer effect, and improve the market competitiveness of the product.

[0044] In the specific structural design aspect that the elastic force of the lower spring 6 is greater than the elastic force of the upper spring 5, the inner diameter of the cylinder shell 1 is ∅D, the wire diameter of the upper spring 5 is (7.7~7.8%)×∅D, and the wire diameter of the lower spring 6 is (7~7.2%)×∅D. The upper spring 5 and the lower spring 6 are made of the same material, so that the lower spring 6 has a greater elastic force than the upper spring 5. The force distribution in the buffer oil cylinder is optimized, the buffer performance is smoother, and the impact force and noise when the door panel is closed are reduced.

[0045] In the specific structure aspect that the piston 3 moves back and forth along the cylinder shell 1 to release pressure and the silicone oil flows into the piston 3, the piston 3 is provided with a drain hole 301, the axis of the drain hole 301 is eccentric to the axis of the piston 3, the side of the piston 3 facing the inner bottom wall of the cylinder shell 1 is provided with an arc-shaped groove 302, and the drain hole 301 is in communication with the inner wall of the arc-shaped groove 302. Specifically, the center of the arc of the arc-shaped groove 302 is concentric with the center of the movable circle. The drain hole 301 is provided in the piston 3 to improve the smoothness of the silicone oil flowing through the piston 3 and achieve a more uniform pressure relief effect. In combination with the difference in elastic force of the upper and lower springs 6, the arc-shaped groove 302 in communication with the drain hole 301 is provided on the side of the piston 3 abutting against the lower spring 6 to improve the stability of the buffering process and reduce the door panel vibration caused by pressure fluctuation. Furthermore, the axis of the drain hole 301 is eccentric to the axis of the piston 3, so that the silicone oil can flow more effectively through the drain hole 301 during pressure relief, improving the buffering performance at small opening and closing angles and reducing the impact force.

[0046] In order to improve the fixation of the first sealing ring 401 on the outer ring wall of the piston 3, thereby ensuring the sealing performance of the upper chamber and the lower chamber separated by the piston 3 in the cylinder shell 1, the outer ring wall of the piston 3 is provided with a fitting groove 303 for fitting the first sealing ring 401. The arc-shaped grooves 302 are arranged at equal angles along the center of the piston 3 in multiple groups. The inner ring wall of the fitting groove 303 is provided with through holes 304 in communication with the arc-shaped grooves 302. The through holes 304 are arranged in multiple groups corresponding to the arc-shaped grooves 302. The inner ring wall of the fitting groove 303 is fitted with the inner ring of the sealing assembly and the inner ring wall of the fitting groove 303, thereby limiting the first sealing ring 401 and reducing the risk of the first sealing ring 401 falling off during use. Furthermore, the inner ring wall of the fitting groove 303 is provided with the through holes 304 in communication with the arc-shaped grooves 302. When the piston 3 moves back and forth along the axis of the cylinder shell 1, the silicone oil flows into the through holes 304 through the long holes and contacts the inner ring of the first sealing ring 401, thereby pushing the outer ring of the first sealing ring 401 against the inner wall of the cylinder shell 1 and improving the sealing performance of the upper chamber and the lower chamber. This improves the stability and reliability of the buffering effect of the buffer oil cylinder. Furthermore, the multiple arc-shaped grooves 302 are arranged at equal angles along the center of the piston 3, so that the through holes 304 are distributed along the center of the piston 3, thereby improving the uniformity of the force of the silicone oil pushing the first sealing ring 401 towards the inner wall of the cylinder shell 1.

[0047] In the embodiment, the arc-shaped grooves 302 are provided with three groups, and each group of the arc-shaped grooves 302 is provided with a plurality of groups of through holes 304 correspondingly, so as to improve the flow efficiency of the silicone oil.

[0048] In order to improve the stability of the assembly of the piston 3 and the push rod 2, and avoid the risk that the piston 3 is offset along the axis of the push rod 2 in the use process of the buffer cylinder, the push rod 2 is provided with an upper stop portion 201 protruding in the radial direction thereof, the upper stop portion 201 is located between the piston 3 and the upper spring 5, and an end of the push rod 2 towards the bottom wall of the cylinder shell 1 is provided with a lower stop portion protruding in the radial direction of the push rod 2, the lower stop portion is located between the piston 3 and the lower spring 6, by providing the upper stop portion 201 and the lower stop portion, the upper and lower ends of the piston 3 in the axial direction are limited, so as to reduce the possibility that the piston 3 moves along the axis of the push rod 2 in the moving process, and improve the stability of the assembly of the piston 3 and the push rod 2.

[0049] It is worth mentioning that, in order to reduce the manufacturing difficulty of the push rod 2 and the assembly difficulty of the piston 3 and the push rod 2, the upper stop portion 201 and the push rod 2 are designed in a split manner, that is, a shaft shoulder is arranged on the push rod 2, one end of the upper stop portion 201 is abutted with the shaft shoulder, the piston 3 in which the first sealing ring 401 is sleeved is loaded, and then one end of the push rod 2 is riveted and pressed, so as to form the lower stop portion.

[0050] Since the piston 3 is provided with a plurality of groups of arc-shaped grooves 302 arranged at equal angles in a circular shape, the lower stop portion needs to avoid the arc-shaped grooves 302, so as to avoid the occlusion caused by the shielding of the arc-shaped grooves 302, the outer diameter of the lower stop portion is less than or equal to the inner diameter of the inner circle surrounded by the plurality of groups of arc-shaped grooves 302, since the lower spring 6 is a pear-shaped spring, the design scheme that the outer diameter of the lower stop portion is less than or equal to the inner diameter of the inner circle surrounded by the plurality of groups of arc-shaped grooves 302 is possible, and the stability of the assembly of the piston 3 and the buffer effect are ensured.

[0051] Due to the multiple holes and grooves on the piston 3, in order to reduce the production cost, the piston 3 is made of plastic injection molding, and the push rod 2 is made of metal material. Because the piston 3 made of plastic has low rigidity, the lower stop portion is limited by the arc-shaped groove 302 and cannot cover the entire end surface of the piston 3. Therefore, the upper stop plate portion is made of metal material, and the area of the upper portion 201 covers the cross section of the piston 3 as much as possible. The diameter of the upper portion 201 is 90% to 95% of the outer diameter of the piston 3, thereby improving the compression resistance of the movable piston. However, if the diameter of the upper stop plate is designed to be large, it will block the oil drain hole 301, affecting normal oil drainage. Therefore, the top of the piston 3 needs to be designed to allow the silicone oil to flow normally. The top wall of the piston 3 is provided with an annular groove 305, which is located below the upper portion 201. The oil drain hole 301 is in communication with the inner wall of the annular groove 305. The outer ring wall of the piston 3 is provided with a cutout 306 that communicates with the annular groove 305. The cutout 306 is located above the assembly groove 303 and is close to the communication position of the oil drain hole 301 and the annular groove 305. Therefore, the silicone oil can flow from the cutout 306 into the oil drain hole 301 and enter the lower chamber. In addition, the oil can flow out of the cutout 306 into the upper chamber, thereby improving the buffering effect of the hydraulic cylinder. By providing the annular groove 305, an oil storage space is formed between the upper portion 201 and the annular groove 305. When the silicone oil cannot be discharged through the cutout 306 or cannot flow into the oil drain hole 301 in time, it will flow into the annular groove 305 for temporary oil storage and then be discharged, thereby improving the buffering effect of the hydraulic cylinder and reducing the opening and closing time of the hinge.

[0052] In order to improve the smoothness of the silicone oil flow and reduce the contact area between the piston 3 and the inner wall of the cylinder shell 1, thereby reducing the sliding resistance of the piston 3, the buffering of the oil cylinder is smooth. The outer ring wall of the piston 3 is provided with a plurality of grooves 307. When multiple grooves 307 are provided, they are arranged on the outer ring wall of the piston 3. By providing grooves 307 on the outer ring wall of the piston 3, the smoothness of the silicone oil flow is improved, the buffering performance is higher, the contact area between the piston 3 and the inner wall of the cylinder shell 1 is reduced, the friction resistance of the piston 3 is reduced, the durability of the buffering oil cylinder is improved, and the wear is reduced. Secondly, the oil flow channel is increased, the congestion problem of the oil in the piston 3 is solved, and a more uniform buffering effect is obtained.

[0053] In order to further improve the sealing performance of the hydraulic oil cylinder, the second sealing ring 402 and the third sealing ring are further included. The second sealing ring 402 is sleeved on the outer ring wall of the push rod 2 and is located between the upper spring 5 and the upper portion 201. The third sealing ring is assembled between the upper cover 7 and the push rod 2 to prevent silicone oil leakage.

[0054] Regarding the formation of the limiting part 101, the lower spring 6, the push rod 2 connected to the piston 3, the second sealing ring 402, the upper spring 5, and the upper cover 7 are sequentially installed into the cylinder shell 1. The upper cover 7 is pressed down into the cylinder shell 1 by the stop pressing, and the top wall of the cylinder shell 1 is pressed into an arc-shaped bend by the pressing machine, thereby forming the bend. As for the pressing process, any pressing equipment that can close the top wall of the cylinder shell 1 is sufficient. Of course, a mold is required for corresponding adjustments. This part is an operation process well known to those skilled in the art.

[0055] Example 2: Including the buffer cylinder for hinges in Example 1, this example provides a specific implementation of the upper spring 5 and the lower spring 6. The inner diameter of the cylinder shell 1 is 7mm, the axial length is 22mm, the outer diameter of the push rod 2 is 3.98mm, the axial length of the piston 3 is 4mm, the wire diameter of the upper spring 5 is 0.55mm, the number of turns is 4, and the pitch is variable, with the first turn being 2mm, the second turn being 4mm, and the third turn being 2mm. The wire diameter of the lower spring 6 is 0.5mm, the number of turns is 6, and the pitch is constant, with the pitch being 2mm.

[0056] Among them, the cylinder shell 1 is made of steel and supported by steel, thereby improving the sealing performance of the buffer cylinder.

[0057] It is worth mentioning that the upper spring 5 and the lower spring 6 are made of the same material, and therefore have the same elastic modulus, and both the upper spring 5 and the lower spring 6 operate within their elastic limits.

[0058] Example 3: As Figures 1-11 As shown, a buffer hinge includes a hinge body and a buffer cylinder for the hinge according to Embodiment 1. The hinge body is equipped with the buffer cylinder. The hinge body includes a support arm 806, a transmission arm 807, and an inner rocker arm 803. The two ends of the support arm 806 are respectively used to hinge one end of the inner rocker arm 803 and one end of the transmission arm 807. The distance between the two hinge points of the support arm 806 is L1. The other end of the transmission arm 807 is hinged to a push rod 2. A rotating shaft is installed in the middle of the transmission arm 807 for rotating assembly with the hinge arm 804. The distances between the axis of the rotating shaft and the two hinge points of the transmission arm 807 are L2 and L3, respectively, where L1:L2:L3=1.65:1:1. An included angle α is formed between L2 and L3. The included angle α is 150~160°, preferably 156°.

[0059] By designing the hinge length of the support arm 806 and the transmission arm 807, as well as the angle of the two hinge points of the transmission arm 807, the smoothness of the force transmission to the push rod 2 when the hinge is opened and closed is improved, and the buffering effect of the hinge opening and closing is improved, so that the hinge can achieve small angle or zero angle buffering, and can also achieve a buffering effect when the cabinet door is opened at a small angle.

[0060] The hinge body further comprises a hinge cup 801, an inner rocker arm 803, an outer rocker arm 802, a hinge arm 804, a base 805, and a torsion spring. The hinge cup 801 is inserted with a U-shaped pin and used for hingedly connecting one end of the inner rocker arm 803 with one end of the outer rocker arm 802. One end of the outer rocker arm 802 is hingedly connected with one end of the hinge arm 804. One end of the hinge arm 804 is assembled with the base 805. The steel shell of the buffer oil cylinder is rotationally assembled with the hinge arm 804. The push rod 2 of the hydraulic oil cylinder is hingedly connected with one end of a transmission arm 807. The torsion spring is assembled at the joint of the outer rocker arm 802 and the hinge arm 804, and two torsion arms of the torsion spring are respectively in contact with the inner top wall of the hinge arm 804 and the inner rocker arm 803.

[0061] Since the hydraulic oil cylinder is horizontally arranged on the hinge arm 804, the push rod 2 is provided with a hinge hole 203 for hingedly connecting the push rod 2 with the transmission arm 807 by means of a rivet. When the axis of the hinge hole 203 is orthogonally projected onto the end surface of the piston 3, the line L4 connecting the center of the oil leakage hole 301 with the center of the piston 3 is arranged perpendicularly to the axis of the hinge hole.

[0062] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical range disclosed in the present application, and these modifications or replacements should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A buffer cylinder for a hinge, comprising a cylinder shell for containing silicone oil, a push rod, an upper spring, a lower spring, and an upper cover, one end of the push rod is connected with a piston via a shaft, an outer ring wall of the piston is sleeved with a first sealing ring for abutting and sealing against an inner wall of the cylinder shell, the lower spring is abutted between an inner bottom wall of the cylinder shell and the piston, the upper cover is coaxially and slidingly assembled with the push rod, a limiting portion is arranged on a top wall of the cylinder shell towards an axial center of the cylinder shell, the upper cover is located on an inner side of the limiting portion, the upper spring is sleeved in the push rod, the upper spring is abutted between the upper cover and the piston, and when the buffer cylinder is in a reset state, the push rod extends out of the top wall of the cylinder shell. The piston is provided with an oil leakage hole, an axis of the oil leakage hole is eccentric to an axis of the piston, the piston is provided with an arc-shaped slot on a side facing an inner bottom wall of the cylinder shell, and the oil leakage hole is in communication with an inner wall of the arc-shaped slot.

2. A cushioned ram for a hinge according to claim 1, wherein: The lower spring has a greater elastic force than the upper spring, the upper spring is a cylindrical spring, and the lower spring is an almond-shaped spring.

3. A cushioned ram for a hinge according to claim 2, wherein: An inner diameter of the cylinder shell is ∅D, a wire diameter of the upper spring is (7.7-7.8%)×∅D, and a wire diameter of the lower spring is (7-7.2%)×∅D.

4. A cushioned ram for a hinge according to claim 1, wherein: An outer ring wall of the piston is provided with an assembly groove for assembling the first sealing ring, the arc-shaped slots are arranged in multiple groups at equal angles along a center of the piston, an inner ring wall of the assembly groove is provided with a through hole in communication with the arc-shaped slots, and the through holes are arranged in multiple groups corresponding to the arc-shaped slots.

5. A cushioned ram for a hinge according to claim 4, wherein: The push rod is provided with an upper stop portion protruding in a radial direction of the push rod, the upper stop portion is located between the piston and the upper spring, and an end of the push rod facing the inner bottom wall of the cylinder shell is provided with a lower stop portion protruding in a radial direction of the push rod, the lower stop portion is located between the piston and the lower spring.

6. A cushioned ram for a hinge according to claim 5, wherein: An outer diameter of the lower stop portion is less than or equal to an inner diameter of a circle formed by the arc-shaped slots.

7. A cushioned ram for a hinge according to claim 6, wherein: The piston is provided with an annular groove in a top wall of the piston, the annular groove is located below the upper stop portion, the oil leakage hole is in communication with an inner wall of the annular groove, an outer ring wall of the piston is provided with a cutout in communication with the annular groove, and the cutout is located above the assembly groove.

8. A cushioned ram for a hinge as defined in claim 5, wherein: The outer ring wall of the piston is provided with a plurality of groups of grooves, the grooves are located above the assembly groove, and when the grooves are arranged in multiple groups, the multiple groups of grooves are annularly arranged on the outer ring wall of the piston.

9. A cushioned ram for a hinge as defined in claim 5, wherein: The piston is provided with an annular groove in a top wall of the piston, the annular groove is located below the upper stop portion, the oil leakage hole is in communication with an inner wall of the annular groove, an outer ring wall of the piston is provided with a cutout in communication with the annular groove, and the cutout is located above the assembly groove.

10. A cushioned hinge comprising a hinge body, characterized by: The piston is provided with a plurality of groups of grooves on the outer ring wall, the grooves are located above the assembly groove, and when the grooves are arranged in multiple groups, the multiple groups of grooves are annularly arranged on the outer ring wall of the piston. The piston is provided with a second sealing ring and a third sealing ring, the second sealing ring is sleeved on an outer ring wall of the push rod and located between the upper spring and the upper stop portion, and the third sealing ring is assembled between the upper cover and the push rod. The hinge body is provided with the buffer oil cylinder, the hinge body includes a support arm, a transmission arm, an inner rocker arm, and a hinge arm, two ends of the support arm are respectively used for hingedly connecting one end of the inner rocker arm and one end of the transmission arm, a distance between the two hinged positions of the support arm is L1, the other end of the transmission arm is hingedly connected with the push rod, a middle part of the transmission arm is provided with a rotating shaft for hingedly connecting with the hinge arm, a distance between an axis of the rotating shaft and the two hinged positions of the transmission arm is respectively L2 and L3, L1:L2:L3=1.65:1:1, an included angle a is formed between L2 and L3, and the included angle a is 150-160°.

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