A nested double-plunger structure and a cylindrical hydraulic tappet

Abstract

The utility model relates to a kind of sleeve type double-piston structure and cylindrical hydraulic jack, including mutually sleeve setting upper plunger and lower plunger, the lower plunger is provided with upper oil cavity, lower oil cavity and the valve hole being communicated with the upper oil cavity and the lower oil cavity, the inside of the upper plunger is provided with upper plunger inner chamber, bottom is provided with bottom opening, the upper plunger is set in the upper oil cavity one side of the lower plunger outside, the position of the upper end opening of the upper oil cavity is higher than the bottom opening. Compared with prior art, the utility model has the advantages that: using the structure of upper plunger and lower plunger sleeve, not only facilitate the discharge of waste when plunger punching processing, but also can improve the oil storage volume of low pressure chamber.

Description

Technical Field

[0001] This utility model relates to the field of engine parts manufacturing technology, specifically to a fitting double plunger structure and a columnar hydraulic tappet. Background Technology

[0002] When the engine valves are closed, the clearance between the valve and the transmission components is called valve clearance. The valve system needs to properly control valve clearance to ensure normal valve train function. Hydraulic tappets compensate for valve clearance, reducing impact and noise in the valve train, wear on the working surfaces of the valve train, and improving engine emissions and combustion efficiency. The plunger, as the core component of the hydraulic tappet, mainly adopts a nearly closed single-plunger structure. However, during the plunger punching process, there is a problem with waste material removal. Simultaneously, the plunger's inner cavity is often designed as a low-pressure chamber. The oil storage volume of the low-pressure chamber is limited by the height of the plunger's oil hole. Considering the strength of the plunger's top and the need for exhaust during oil intake, the plunger's oil hole position cannot be too high. However, if the external oil supply system is not timely in supplying oil, the oil storage capacity of the low-pressure chamber will be insufficient.

[0003] To address the aforementioned problems, existing technologies, such as Chinese patent document CN222823297U, disclose a dual-channel hydraulic tappet comprising a housing, an upper plunger, a lower plunger, a gasket, and a one-way valve ball. The gasket is located between the upper and lower plungers. The lower end of the upper plunger has an opening, which is sealed by the gasket. The lower plunger has a return oil groove and a return oil hole. A low-pressure chamber is formed between the lower plunger and the gasket. The return oil hole connects the high-pressure chamber and the low-pressure chamber through the gap between the lower plunger and the housing. This solution solves the problem of difficult waste removal during the plunger punching process by dividing a single plunger into an upper and lower plunger dual-plunger structure. The plunger oil hole of the lower plunger is designated as a return oil hole, and the return oil circulation method solves the problem of insufficient oil in the low-pressure chamber due to untimely oil supply. However, the return oil cycle requires sufficient oil volume to support subsequent cycles at the beginning. In this scheme, the oil storage volume of the low-pressure chamber is still limited by the height of the plunger oil hole, which cannot guarantee that the low-pressure chamber has sufficient oil volume at the beginning of the return oil cycle.

[0004] In summary, the problem of difficult discharge of waste material from plunger punching can be solved by using a dual-plunger structure. However, in existing dual-plunger structures, the oil storage volume of the low-pressure chamber is still limited. If the oil volume in the low-pressure chamber is lost due to special operating conditions and the external oil supply system does not supply oil in time, it will result in insufficient oil in the low-pressure chamber to replenish the high-pressure chamber, causing the valve clearance to be unable to be eliminated. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide a fitting double plunger structure and a columnar hydraulic tappet, which not only facilitates the discharge of waste material during plunger punching, but also increases the oil storage volume of the low-pressure chamber.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a nested double plunger structure, comprising an upper plunger and a lower plunger nested together, the lower plunger having an upper oil cavity, a lower oil cavity, and a valve hole connecting the upper oil cavity and the lower oil cavity, the upper plunger having an inner cavity inside and a bottom opening at the bottom, the upper plunger being sleeved on the outside of the upper oil cavity side of the lower plunger, the upper opening of the upper oil cavity being higher than the bottom opening.

[0007] The advantages of this solution are as follows: Compared to the hydraulic tappets with a single-plunger structure in existing technologies, the upper and lower plungers make it easier to remove processing waste during manufacturing, improving production efficiency and yield, thereby reducing costs. Furthermore, the upper and lower plungers adopt a nested structure, allowing the upper oil chamber side of the lower plunger to fit into the bottom opening of the upper plunger. The top of the outer wall of the upper oil chamber side of the lower plunger can extend upwards, which helps to expand the oil storage volume of the low-pressure chamber, ensuring sufficient oil in the low-pressure chamber. This prevents insufficient oil supply from the external oil supply system, thus avoiding the problem of valve clearance not being eliminated due to insufficient oil replenishment from the low-pressure chamber to the high-pressure chamber.

[0008] Furthermore, the top of the lower plunger converges inward.

[0009] This utility model also provides a columnar hydraulic tappet, comprising: The housing has a plunger cavity and an oil inlet hole extending into the plunger cavity; In the aforementioned nested double plunger structure, the nested double plunger structure is installed in the plunger cavity, the lower plunger is installed at the bottom of the plunger cavity, and the lower oil cavity side of the lower plunger forms a high-pressure oil storage cavity with the inner wall of the plunger cavity.

[0010] Furthermore, it also includes: A one-way valve mechanism is disposed between the lower plunger and the bottom of the plunger cavity, and is used to control the opening and closing of the valve orifice; A return spring is provided between the lower plunger and the bottom of the plunger cavity.

[0011] Furthermore, the lower end of the upper plunger is provided with a first oil inlet channel communicating with the oil inlet hole, and a second oil inlet channel communicating with the first oil inlet channel and the upper oil chamber is provided between the upper plunger and the lower plunger.

[0012] Furthermore, the first oil inlet channel is an oil groove on the end face of the upper plunger.

[0013] The advantages of this scheme are: the first oil inlet channel is the oil groove on the end face of the bottom of the upper plunger, which can be directly formed by cold forging, thus improving production efficiency.

[0014] Furthermore, the first oil inlet channel is a side oil hole that extends from the side wall of the upper plunger into the inner cavity of the upper plunger.

[0015] Furthermore, the second oil inlet channel is an inner oil groove provided on the inner wall of the upper plunger.

[0016] Furthermore, the second oil inlet channel is an outer oil groove provided on the outer wall of the lower plunger.

[0017] Furthermore, the second oil inlet channel is the gap between the upper plunger and the lower plunger. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a fitting double plunger structure in this embodiment.

[0019] Figure 2 This is a schematic diagram of a columnar hydraulic tappet in this embodiment.

[0020] Figure 3 This is a frontal schematic diagram of the internal structure of the upper plunger in this embodiment.

[0021] Figure 4 This is a side view of the internal structure of the upper plunger in this embodiment.

[0022] Figure 5 This is a schematic diagram of the internal structure of the lower plunger in this embodiment.

[0023] Figure 6 This is a schematic diagram of the internal structure of another type of lower plunger in this embodiment.

[0024] Figure 7 This is a schematic diagram of the highest oil storage level of the low-pressure chamber of an existing cylindrical hydraulic tappet.

[0025] Figure 8 This is a schematic diagram of the highest oil storage level in the low-pressure chamber in this embodiment.

[0026] Figures 1-8 middle: 1. Shell; 10. Plunger cavity; 101. High-pressure oil reservoir; 102. Drain ring; 11. Oil inlet; 2. Upper plunger; 20. Upper plunger inner cavity; 21. Bottom opening; 22. First oil inlet channel; 23. Second oil inlet channel; 24. External annular groove; 25. Top opening; 3. Lower plunger; 301. Upper oil chamber; 302. Lower oil chamber; 31. Valve hole; 32. Upper opening; 33. Top; 4. Check valve mechanism; 41. Check valve ball; 42. Check valve spring; 43. Check valve spring seat; 5. Return spring; 6. Snap ring; 7. Highest oil storage level; 8. Plunger oil hole. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0028] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an integral connection, or a detachable connection; they can refer to the internal connection of two components; they can refer to a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0030] like Figure 1 As shown, this embodiment of a nested double plunger structure includes an upper plunger 2 and a lower plunger 3. In this embodiment, the structure of the upper plunger 2 is as follows: Figure 3-4 As shown, the upper plunger 2 is provided with a top opening 25, which allows oil to be output upwards for lubrication of the engine's ball joints and rollers. Preferably, in this embodiment, the lower plunger 3 of the first implementation is as follows... Figure 5 As shown, the top 33 of the lower plunger 3 converges inward. In this embodiment, the lower plunger 3 of the second implementation is as follows: Figure 6 As shown, the top 33 of the lower plunger 3 does not converge inward.

[0031] As a special feature of this embodiment, the structure of the upper plunger 2 is as follows: Figure 3-4As shown, the upper plunger 2 has an inner cavity 20 and a bottom opening 21. In this embodiment, the lower plunger 3 has the following structure: Figure 5-6 As shown, the lower plunger 3 is provided with an upper oil chamber 301, a lower oil chamber 302, and a valve hole 31 connecting the upper oil chamber 301 and the lower oil chamber 302. One side of the upper oil chamber 301 of the lower plunger 3 enters the inner cavity 20 of the upper plunger through the bottom opening 21, so that the upper plunger 2 is sleeved outside the upper oil chamber 301 side of the lower plunger 3, and the upper opening 32 of the upper oil chamber 301 is higher than the bottom opening 21.

[0032] The advantage of this design is that, compared to the hydraulic tappets with a single plunger structure in the prior art, this embodiment replaces the single plunger structure with a double plunger structure of upper plunger 2 and lower plunger 3, which makes it easier to remove processing waste during the manufacturing process, improves production efficiency and yield, and thus reduces costs.

[0033] Another advantage of this design is that the upper plunger 2 and the lower plunger 3 adopt a fitting structure, so that the upper oil chamber 301 side of the lower plunger 3 is fitted and connected to the bottom opening 21 of the upper plunger 2. The top of the outer wall of the upper oil chamber 301 side of the lower plunger 3 can continue to extend upward, which is conducive to expanding the oil storage volume of the low-pressure chamber and ensuring that the low-pressure chamber has enough oil. This avoids the problem that the valve clearance cannot be eliminated because the external oil supply system does not supply oil in time, resulting in insufficient oil in the low-pressure chamber to replenish the high-pressure chamber.

[0034] like Figure 2 As shown, a cylindrical hydraulic tappet of this embodiment includes a housing 1, the aforementioned fitted double-plunger structure, a one-way valve mechanism 4, a return spring 5, and a retaining ring 6. The housing 1 has a plunger cavity 10 and an oil inlet 11 extending into the plunger cavity 10. The fitted double-plunger structure is disposed within the plunger cavity 10, and the lower plunger 3 is installed at the bottom of the plunger cavity 10. One side of the lower oil chamber 302 of the lower plunger 3 forms a high-pressure oil reservoir 101 with the inner wall of the plunger cavity 10. In this embodiment, the structure of the upper plunger 2 is as follows... Figure 3-4 As shown. The upper plunger 2 is provided with an outer annular groove 24, and the retaining ring 6 is disposed in the outer annular groove 24.

[0035] Preferably, in this embodiment, the upper plunger 2 has the following structure: Figure 3-4 As shown. The upper plunger 2 is provided with a first oil inlet channel 22 that connects the oil inlet hole 11 and the inner cavity 20 of the upper plunger, and a second oil inlet channel 23 that connects the first oil inlet channel 22 and the upper oil cavity 301 is provided between the upper plunger 2 and the lower plunger 3.

[0036] To more intuitively illustrate the oil storage volume of the low-pressure chamber in this embodiment, when the external oil supply system fails to supply oil to the oil inlet 11 of the hydraulic tappet housing 1 in a timely manner, the highest oil storage levels of the existing cylindrical hydraulic tappet and the low-pressure chamber of this embodiment are respectively as follows: Figure 7 and Figure 8 As shown. In existing cylindrical hydraulic tappets, the highest oil level 7 in the low-pressure chamber does not exceed the plunger oil hole 8. However, in this embodiment, the highest oil level 7 in the low-pressure chamber is the upper end face where the upper opening 32 of the upper oil chamber 301 is located. It should be noted that in this embodiment, the position of the first oil inlet channel 22 corresponds to the position of the plunger oil hole 8 in existing cylindrical hydraulic tappets. Therefore, when the upper end face where the upper opening 32 of the upper oil chamber 301 is located is higher than the first oil inlet channel 22, the highest oil level 7 in this embodiment is higher than that of existing cylindrical hydraulic tappets.

[0037] Preferably, in this embodiment, the one-way valve mechanism 4 is disposed between the lower plunger 3 and the bottom of the plunger cavity 10. The one-way valve mechanism 4 includes a one-way valve ball 41, a one-way valve spring 42, and a one-way valve spring seat 43. The one-way valve ball 41 is disposed at the valve hole 31 of the lower plunger 3, so that the one-way valve mechanism 4 is used to control the opening and closing of the valve hole 31. The one-way valve spring seat 43 is connected to the one-way valve ball 41 through the one-way valve spring 42.

[0038] Preferably, in this embodiment, the return spring 5 is disposed between the bottom of the lower plunger 3 and the plunger cavity 10. At this time, one side of the lower oil cavity 302 of the lower plunger 3 and the inner wall of the plunger cavity 10 form a high-pressure oil storage cavity 101, and an oil drain ring 102 connecting the high-pressure oil storage cavity 101 and the oil inlet 11 is formed between the side wall of the lower plunger 3 and the inner wall of the plunger cavity 10.

[0039] like Figure 3-4 As shown, preferably, in this embodiment, the first oil inlet channel 22 is an oil groove on the end face of the bottom of the upper plunger 2. The advantage of this arrangement is that the first oil inlet channel 22 is an oil groove on the end face of the bottom of the upper plunger 2, which can be directly formed by cold heading, thereby improving production efficiency.

[0040] It should be noted that in this embodiment, the first oil inlet channel 22 being an end face oil groove located at the bottom of the upper plunger 2 is merely a preferred embodiment. Those skilled in the art should understand that the first oil inlet channel 22 can also be a side oil hole extending from the side wall of the upper plunger 2 into the inner cavity 20 of the upper plunger.

[0041] Preferably, in this embodiment, the second oil inlet channel 23 is an inner oil groove provided on the inner wall of the upper plunger 2. External oil enters the inner cavity 20 of the upper plunger 2 sequentially through the oil inlet hole 11 of the housing 1 and the first oil inlet channel 22 of the upper plunger 2, and then rises along the second oil inlet channel 23 and quickly enters the upper oil cavity 301 of the lower plunger 3.

[0042] It should be noted that in this embodiment, the second oil inlet channel 23 being an inner oil groove on the inner wall of the upper plunger 2 is merely a preferred embodiment. Those skilled in the art should understand that the second oil inlet channel 23 can also be an outer oil groove on the outer wall of the lower plunger 3, or the gap between the upper plunger 2 and the lower plunger 3.

[0043] In summary, the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A nested double plunger structure, characterized in that, The device includes an upper plunger (2) and a lower plunger (3) that are fitted together. The lower plunger (3) is provided with an upper oil chamber (301), a lower oil chamber (302), and a valve hole (31) connecting the upper oil chamber (301) and the lower oil chamber (302). The upper plunger (2) is provided with an upper plunger inner cavity (20) and a bottom opening (21) at the bottom. The upper plunger (2) is fitted outside the upper oil chamber (301) of the lower plunger (3). The upper opening (32) of the upper oil chamber (301) is higher than the bottom opening (21).

2. The fitting double plunger structure according to claim 1, characterized in that, The top (33) of the lower plunger (3) converges inward.

3. A cylindrical hydraulic tappet, characterized in that, include: The housing (1) is provided with a plunger cavity (10) and an oil inlet (11) extending through the plunger cavity (10). The fitting double plunger structure according to any one of claims 1-2, wherein the fitting double plunger structure is installed in the plunger cavity (10), the lower plunger (3) is installed at the bottom of the plunger cavity (10), and the lower oil cavity (302) side of the lower plunger (3) forms a high-pressure oil storage cavity (101) with the inner wall of the plunger cavity (10).

4. The cylindrical hydraulic tappet according to claim 3, characterized in that, Also includes: One-way valve mechanism (4), the one-way valve mechanism (4) is disposed between the bottom of the lower plunger (3) and the plunger cavity (10), and is used to control the opening and closing of the valve hole (31); A return spring (5) is provided between the lower plunger (3) and the bottom of the plunger cavity (10).

5. The cylindrical hydraulic tappet according to claim 3, characterized in that, The lower end of the upper plunger (2) is provided with a first oil inlet channel (22) communicating with the oil inlet hole (11), and a second oil inlet channel (23) communicating with the first oil inlet channel (22) and the upper oil chamber (301) is provided between the upper plunger (2) and the lower plunger (3).

6. The cylindrical hydraulic tappet according to claim 5, characterized in that, The first oil inlet channel (22) is an oil groove on the end face of the bottom of the upper plunger (2).

7. The cylindrical hydraulic tappet according to claim 5, characterized in that, The first oil inlet channel (22) is a side oil hole that extends from the side wall of the upper plunger (2) to the inner cavity (20) of the upper plunger.

8. The cylindrical hydraulic tappet according to claim 5, characterized in that, The second oil inlet channel (23) is an inner oil groove provided on the inner wall of the upper plunger (2).

9. The cylindrical hydraulic tappet according to claim 5, characterized in that, The second oil inlet channel (23) is an outer oil groove provided on the outer wall of the lower plunger (3).

10. The cylindrical hydraulic tappet according to claim 5, characterized in that, The second oil inlet channel (23) is the gap between the upper plunger (2) and the lower plunger (3).

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