Self-compensating buffer and roller cage shoe

Abstract

The utility model discloses a self-compensating buffer and a roller cage shoe. The self-compensating buffer comprises a cylinder barrel, a spring and a spring, the base is used for sealing one end of the cylinder barrel, and the base is provided with a lower oil channel communicated to the interior of the cylinder barrel from one side; the gland is used for sealing the other end of the cylinder barrel, the gland is provided with a center hole, and the gland is provided with an upper oil channel communicated to the center hole from the outer end face; the external pipeline is used for communicating the upper oil duct with the lower oil duct; the push rod is provided with a first part and a second part which take the spring seat as a boundary, the spring seat and the first part are located in the cylinder barrel, and the second part is matched with the center hole and extends out of the cylinder barrel; the disc spring group is supported between the spring seat and the base and takes the first part as a spring guide column; wherein the cylinder barrel is filled with oil. According to the self-compensating buffer, water or dust is not prone to entering the cylinder cavity.

Description

Technical Field

[0001] The utility model relates to a buffer equipped with a roller tank ear and also relates to a roller tank ear equipped with the buffer. Background Art

[0002] The roller can ear usually includes a seat body, a rocker arm, a roller and a buffer, wherein the seat body is also called a lower bracket, and the main body of the lower bracket is generally a plate structure. Two pin seats are generally provided on one plate surface of the seat body. Since the side where the roller is located is generally called the front side, that is, the side where the roller can ear cooperates with the can channel, the side where the buffer is located is correspondingly called the rear side, so that the force of the roller pressing on the can channel is provided based on the support of the buffer from the rear side, and buffering is generated based on its elasticity, which is similar to the shock absorption system of a vehicle. Based on this orientation, the two pin seats mentioned above can be divided into a front pin seat and a rear pin seat.

[0003] Among them, the rocker arm is also called the upper bracket. Its structure adopts an L-shaped structure in most applications. In fewer applications, the rocker arm is a vertical rod structure. The main reason for adopting the L-shaped structure is that the initial angle between the buffer and the seat body is close to 90°. If a vertical rod structure is adopted, the buffer needs to be tilted forward and hinged to the rear side of the upper end of the rocker arm.

[0004] Furthermore, one end of the rocker arm is hinged to the front pin seat through the first pin assembly, and the lower end of the buffer is hinged to the rear pin seat through the second pin assembly, and the upper end of the aforementioned buffer is hinged to the upper end of the rocker arm through the third pin assembly, thereby forming a hinged four-bar linkage. Anyone with a little common sense can understand that, for example, the vehicle shock absorber works in real time during the operation of the vehicle. Similarly, in the field of roller can ear technology, the buffer also works in real time during the operation of the roller can ear, thereby buffering the vibration during the operation of the roller. In other words, the buffer is always performing telescopic movement.

[0005] Figure 1 The structure shown omits the pipe part for connecting the upper and lower ends of the cylinder cavity 20, which can roughly show the general principle of the buffer. The buffer usually includes a cylinder 5, one end of which is sealed with a base 3, and is generally a barrel structure. The barrel mouth has an internal thread, and then a gland 8 with a center hole and external threads is adapted to seal the other end of the cylinder 5, that is, the gland 8 is roughly equivalent to a screw plug, and its external thread is fixed by matching with the internal thread. Among them, the center hole is used for the intervention of the push rod, and the cylinder cavity 20 is provided with a disc spring group for buffering the push rod. At this time, the center hole and the push rod need to be sealed, and the sealing form is a dynamic seal, which is mainly used to reduce dust, moisture, etc. from entering the cylinder cavity 20.

[0006] Although in the prior art, in order to achieve relatively good dynamic sealing, two seals are often used between the push rod and the center hole, during the operation of the buffer, as the length of the push rod inserted into the cylinder cavity 20 changes, the volume of the cylinder cavity 20 will change. In other words, positive and negative pressures will frequently change in the cylinder cavity. Although two seals are provided, some dust or moisture may still be sucked in, causing, for example, rust on the disc spring 7. Utility Model Content

[0007] The utility model aims to provide a self-compensating buffer which is not easy for moisture or dust to enter into the cylinder cavity. The utility model also provides a roller tank ear equipped with the self-compensating buffer.

[0008] According to a first aspect of an embodiment of the utility model, a self-compensating buffer is provided, which is a buffer for a roller tank ear, and the self-compensating buffer comprises:

[0009] Cylinder, which is a cylinder;

[0010] A base is used to seal one end of the cylinder barrel, and the base is provided with a lower oil passage connected to the cylinder barrel from one side;

[0011] A gland is used to seal the other end of the cylinder barrel, and the gland has a center hole. The gland is provided with an upper oil passage connected from the outer end surface to the center hole;

[0012] External pipeline, used for connecting the upper oil channel with the lower oil channel;

[0013] A push rod having a first portion and a second portion bounded by a spring seat, wherein the spring seat and the first portion are located within the cylinder, and the second portion cooperates with the central hole and extends out of the cylinder; and

[0014] The disc spring assembly is supported between the spring seat and the base, and the first part is used as a spring guide column;

[0015] Among them, the cylinder is filled with oil.

[0016] Optionally, the spring seat is a collar formed on the push rod;

[0017] The gland is formed with a countersunk hole corresponding to the shaft collar;

[0018] The upper oil passage is connected to the counterbore.

[0019] Optionally, an annular groove is formed on the end surface of the base located inside the cylinder;

[0020] The lower oil passage is communicated with the annular groove.

[0021] Optionally, there are two seals between the push rod and the center hole;

[0022] Both seals are located in the center hole excluding the counterbore.

[0023] Optionally, the external pipe is a rigid pipe.

[0024] Optionally, the rigid tube includes an upper tube and a lower tube;

[0025] The upper tube and the lower tube are connected in a plug-in manner, and at least one seal is provided on the interface of the plug-in connection.

[0026] Optionally, the push rod includes a sleeve-shaped spring seat nut and a connecting screw matched with the spring seat nut;

[0027] The spring seat nut is guided in the central hole, and the cooperation between the connecting screw and the spring seat nut is used to adjust the length of the push rod.

[0028] Optionally, a side hole is formed in the portion of the spring seat nut located in the cylinder.

[0029] Optionally, the lower pin sleeve of the cylinder seat and the upper pin sleeve of the push rod are both provided with bushings.

[0030] According to a second aspect of an embodiment of the utility model, a roller tank ear is provided, comprising the self-compensating buffer described in the first aspect of an embodiment of the utility model.

[0031] In the embodiment of the utility model, the self-compensation of the provided self-compensating buffer comes from the compensation of the liquid in the cylinder barrel. Specifically, an upper oil channel is opened on the cylinder head of the self-compensating buffer, and a lower oil channel is opened on the base of the self-compensating buffer, and then an oil pipe is used to connect the upper oil channel and the lower oil channel. When the push rod moves downward, the volume of the cylinder cavity formed by the gland, the base and the cylinder barrel becomes smaller, and the fluid in the cylinder cavity has a tendency to backwash. Although there is a seal between the push rod and the center hole of the cylinder head, a small amount of gas may still be discharged. When the push rod moves upward, the volume of the cylinder cavity increases. If it increases to a point where negative pressure is generated in the cylinder cavity, external gas will tend to enter the cylinder cavity. Due to the presence of a dynamic seal, it does not necessarily cause gas to enter the cylinder cavity. The negative pressure needs to be low enough, and the interface between the push rod and the center hole sucks in external elements such as air, dust or water. At this time, since the upper oil channel is connected to the center hole, the suction power first acts on the upper oil channel, and some oil may be sucked into the connecting pipeline. If the connecting pipeline is full, some oil may enter the center hole. On the one hand, it can provide lubrication. On the other hand, when there is liquid on the matching interface of the dynamic seal, its sealing ability is often improved. In addition, the self-compensation of the oil can effectively reduce or avoid the entry of external moisture or dust, and effectively protect the components in the cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of the main cross-sectional structure of a self-compensating buffer in one embodiment.

[0033] Figure 2 Schematic diagram of the left side structure of a self-compensating buffer in one embodiment.

[0034] In the figure: 1. lower pin sleeve, 2. lower bushing, 3. base, 4. ring groove, 5. cylinder barrel, 6. connecting hole, 7. disc spring, 8. pressure cover, 9. outer skeleton rubber dustproof oil seal, 10. Y-type oil seal for sealing groove, 11. spring seat nut, 12. connecting screw, 13. upper pin sleeve, 14. upper bushing, 15. upper tube, 16. sealing ring, 17. upper oil passage, 18. shaft collar, 19. lower tube, 20. cylinder chamber, 21. lower oil passage, 22. retaining ring, 23. set screw, 24. retaining ring. DETAILED DESCRIPTION

[0035] It should be known that when the roller tank ear is in operation, the buffer it is equipped with works in real time, and the time for the buffer to expand or contract is often very short. At the same time, since the dynamic seal between the push rod equipped with the buffer and the center hole opened by the gland 8 has a certain sealing ability, the existence of positive or negative pressure in the buffer does not necessarily cause the gas in the cylinder 5 to leak, nor does it necessarily cause external gas, dust or moisture to enter the cylinder 5. In other words, the positive or negative pressure in the buffer needs to reach a certain degree before leakage occurs. In general, the situation that requires self-compensation does not appear in real time, unless the roller tank ear and the tank channel do not cooperate well, causing the buffer to expand and contract violently.

[0036] If leakage occurs, suction will be generated at the inner end of the center hole (negative pressure condition in the cylinder 5) or the outer end (positive pressure condition in the cylinder 5). Since the inside of the cylinder 5 can be simply understood as a balanced pressure condition, if suction is generated at, for example, the inner end of the center hole and the balanced pressure condition is broken, the liquid in the lower part of the cylinder 5 may be sucked to the upper part of the cylinder 5 through the external pipe.

[0037] The self-compensating buffer according to the basic concept of the present invention is described in detail below, and the conventional configuration thereof is only briefly described.

[0038] As a type of buffer, the self-compensating buffer also includes a cylinder barrel 5, a base 3 and a pressure cover 8. These three components are assembled into a cylinder body. The inner cavity of the cylinder body is the cylinder cavity 20 shown in the figure, which is used to accommodate and protect, for example, a disc spring 7 and a part of the push rod located in the cylinder cavity 20.

[0039] The cylinder 20 is generally a cylinder, and the material is generally 45# steel or Q235, and aluminum alloy can also be used in some implementations.

[0040] One end of the cylinder 20 has an internal thread, and the gland 8 has an external thread matching the internal thread. The gland 8 as a whole forms a screw plug and seals the cylinder 20 from the upper end.

[0041] The lower end of the cylinder 20 is generally sealed by a base 3, which is also called a cylinder seat. The cylinder 20 and the base 3 are generally connected by welding.

[0042] Base 3 Figure 1 and 2 As shown, there is generally a lower pin sleeve 1, which is used for hinged connection with the seat body of the roller tank ear through a pin shaft.

[0043] The sleeve hole of the lower pin sleeve 1 is generally inlaid with a copper sleeve, so as to form a Figure 1 The lower bushing 2 shown in FIG. 1 is the same as for the upper pin sleeve 13 and will not be repeated.

[0044] Figure 1 In the embodiment, the part where the base 3 and the cylinder 5 are combined is generally a disc-shaped part. Figure 1 In the illustrated structure, the base 3 has a lower oil passage 21, which includes a first radial oil passage opened from the side of the disc-shaped member and a first axial oil passage opened from the end face of the disc-shaped member on the side where the cylinder 5 is located, and the first axial oil passage is connected to the first radial oil passage.

[0045] Looking at the gland 8, the gland 8 has a center hole to guide the push rod of the buffer, and the center hole is used for the push rod to intervene in the cylinder 5. The gland 8 is provided with an upper oil passage 17 connected from the outer end surface to the center hole. Figure 1 As can be seen in the figure, one end face of the gland 8 is exposed to the outside, which is recorded as the outer end face, and the other end face constitutes the cavity wall of the cylinder cavity 20, which is called the inner end face. The upper oil passage 17 first opens a second axial oil passage from the outer end face, and then opens a second radial oil passage, which is connected to the second axial oil passage, wherein the second radial oil passage is connected to the center hole.

[0046] Furthermore, an external pipeline is configured to connect the upper oil channel 17 with the lower oil channel 21; when a relatively large suction force is generated at the center hole, it will affect the circulation of the liquid in the external pipeline, and may suck part of the liquid into the center hole, thereby reducing or blocking the absorption of moisture or dirt from the outside at the center hole and the push rod.

[0047] In addition, the oil used may be lubricating oil. At this time, if a portion of the oil enters the center hole, the push rod and the center hole will fit more smoothly.

[0048] At the same time, it should be known that if there is liquid at the mating interface, it is easier to form a relatively reliable seal.

[0049] The extended end of the push rod has an upper pin sleeve 13, which is common knowledge in the art and will not be described in detail here. Figure 1It can be seen that there is a collar 18 in the middle of the spring seat nut 11 which constitutes a part of the push rod. The diameter of the collar 18 is larger than the diameter of the center hole and is used to form a spring seat. The push rod is divided into two parts with the spring seat as the boundary, which are marked as the first part and the second part. The spring seat and the first part are located in the cylinder 5, and the second part cooperates with the center hole and extends out of the cylinder 5.

[0050] A buffering element is then provided, namely a disc spring assembly, which is supported between the spring seat and the base 3, and the first part is used as a spring guide column.

[0051] Furthermore, the cylinder 5 is filled with oil, and the oil is preferably lubricating oil, and the filling amount is preferably not more than half of the cylinder cavity 20.

[0052] Figure 1 In the embodiment of the utility model, a countersunk hole is formed on the inner end surface of the gland 8. As a mechanical common sense, the countersunk hole is generally used in conjunction with, for example, a bolt hole to accommodate, for example, a bolt head. In the embodiment of the utility model, the countersunk hole is used in conjunction with the center hole and maintains good coaxiality with the center hole to accommodate the collar 18. The upper oil passage 17 is connected to the countersunk hole, and the oil sucked into the countersunk hole quickly spreads here, making it easier for the oil to enter the center hole.

[0053] Figure 1 In the embodiment, an annular groove 4 is formed on the end surface of the base 3 located in the cylinder 5 , and correspondingly, the lower oil passage 21 is connected to the annular groove 4 .

[0054] Figure 1 There are two seals between the push rod and the center hole, such as Figure 1 The outer skeleton rubber dustproof oil seal 9 shown in the figure constitutes a seal and the sealing groove is formed by a Y-type oil seal 10.

[0055] Correspondingly, the central hole of the gland 8 is provided with corresponding grooves for installing corresponding sealing elements.

[0056] Both seals are located in the center hole except the countersunk hole. In other words, they are located outside the countersunk hole, which is conducive to better oil intervention.

[0057] Figure 1 In the embodiment, the external pipe is a rigid pipe, and includes an upper pipe 15 and a lower pipe 19, which are connected by a plug-in method to adapt to the change of the buffer assembly size. At the same time, at least one seal is provided on the joint surface of the upper pipe 15 and the lower pipe 19, such as Figure 1 The two seals shown in FIG. 1 are formed by the sealing rings 16 .

[0058] In order to facilitate the adjustment of the buffer, the push rod includes a sleeve-shaped spring seat nut 11 and a connecting screw 12 matched with the spring seat nut 11, and the axial adjustment of the two can be adapted to the pre-adjustment of the overall length of the buffer by the roller ear.

[0059] The spring seat nut 11 is guided in the central hole, and the connecting screw 12 cooperates with the spring seat nut 11 to adjust the length of the push rod.

[0060] exist Figure 1 In the illustrated structure, the portion of the spring seat nut 12 located in the cylinder 5 is provided with a side hole, such as Figure 1 The connecting hole 6 shown in the figure is conducive to the flow of oil in the cylinder cavity 20. It should be known that the disc spring 7 is disc-shaped and has a certain axial shielding effect, while the spring seat nut 12 is a tubular member, and the side hole is conducive to the relatively smooth flow of oil in the cylinder cavity 20.

Claims

1. A self-compensating buffer, which is a buffer for roller tank ears, characterized in that: The self-compensating buffer comprises: Cylinder, which is a cylinder; A base is used to seal one end of the cylinder barrel, and the base is provided with a lower oil passage connected to the cylinder barrel from one side; A gland is used to seal the other end of the cylinder barrel, and the gland has a center hole. The gland is provided with an upper oil passage connected from the outer end surface to the center hole; External pipeline, used for connecting the upper oil channel with the lower oil channel; A push rod having a first portion and a second portion bounded by a spring seat, wherein the spring seat and the first portion are located within the cylinder, and the second portion cooperates with the central hole and extends out of the cylinder; and The disc spring assembly is supported between the spring seat and the base, and the first part serves as a spring guide column; Among them, the cylinder is filled with oil.

2. The self-compensating buffer according to claim 1, characterized in that The spring seat is a collar formed on the push rod; The gland is formed with a countersunk hole corresponding to the shaft collar; The upper oil passage is connected to the counterbore.

3. The self-compensating buffer according to claim 1, characterized in that The end surface of the base located inside the cylinder is provided with an annular groove; The lower oil passage is communicated with the annular groove.

4. The self-compensating buffer according to claim 2, characterized in that There are two seals between the push rod and the center hole; Both seals are located in the center hole excluding the counterbore.

5. The self-compensating buffer according to any one of claims 1 to 4, characterized in that: The external pipe is a rigid pipe.

6. The self-compensating buffer according to claim 5, characterized in that The rigid tube includes an upper tube and a lower tube; The upper tube and the lower tube are connected in a plug-in manner, and at least one seal is provided on the interface of the plug-in connection.

7. The self-compensating buffer according to claim 1, characterized in that The push rod comprises a sleeve-shaped spring seat nut and a connecting screw matched with the spring seat nut; The spring seat nut is guided in the central hole, and the cooperation between the connecting screw and the spring seat nut is used to adjust the length of the push rod.

8. The self-compensating buffer according to claim 7, characterized in that The portion of the spring seat nut located in the cylinder barrel is provided with a side hole.

9. The self-compensating buffer according to claim 1, characterized in that The lower pin sleeve of the cylinder seat and the upper pin sleeve of the push rod are both provided with bushings.

10. A roller can ear, characterized in that: A self-compensating buffer comprising any one of claims 1 to 9.

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