Shell structure of hydraulic tensioner and hydraulic tensioner

Abstract

The utility model relates to a shell structure of a hydraulic tensioner and the hydraulic tensioner, and relates to the technical field of tensioners. The shell structure of the hydraulic tensioner comprises a shell body, and a mounting hole used for mounting a plunger is formed in the shell body; a high-pressure cavity is formed at the end part of the mounting hole in the shell main body; bolt holes for inserting bolts and fixedly mounting the shell main body are formed in the shell main body; a first fixing hole for mounting a first pressure sensor and a second fixing hole for mounting a displacement sensor are respectively formed in the shell main body; the first fixing hole is communicated with the high-pressure cavity; the second fixing hole is located in one side of the mounting hole and extends towards the hole opening of the mounting hole. The utility model further discloses the tensioner comprising the shell structure. According to the hydraulic tensioner and the shell structure, the numerical relationship among the tensioning force of the tensioning guide plate, the displacement of the plunger of the tensioner and the pressure of each hydraulic chamber of the tensioner in a timing chain system can be conveniently and accurately analyzed.

Description

Technical Field

[0001] The present application relates to the technical field of tensioners, and in particular to a housing structure of a hydraulic tensioner and a hydraulic tensioner. Background Art

[0002] Tensioners are commonly used as retaining devices in belt and chain drive systems. Their characteristic is to maintain proper tension on the belt and chain during transmission, thereby preventing belt slippage, preventing the synchronous belt from jumping or stripping teeth, and preventing the chain from loosening or falling off, thereby reducing wear on the sprocket and chain. Tensioners have various structures and, in terms of function, are generally classified into two categories: fixed and adjustable. Hydraulic tensioners are an adjustable type, utilizing hydraulic drive and spring rebound to automatically adjust the tension.

[0003] Hydraulic tensioners are widely used in automotive timing chain systems, providing tension to the tensioning guide. Maintaining pressure in the piston cavity within the tensioner generates thrust on the piston, effectively tensioning the timing chain. This approach not only effectively improves engine reliability but also significantly enhances engine efficiency. In practical applications, hydraulic tensioners are complex and precise mechanical devices, and their performance directly impacts the overall operating state of the engine. Therefore, researchers are closely focused on optimizing tensioner performance and measuring and analyzing related parameters.

[0004] Existing hydraulic tensioner designs generally focus on the tensioner's basic function: ensuring the proper function of the plunger through a set internal pressure. To ensure the tensioner's proper function, a complex oil circuit and one-way valve assembly are deployed to ensure the flow and pressure distribution of the hydraulic oil. The basic principle is as follows: the hydraulic oil first passes through a large, low-pressure reservoir, then through a narrow channel to the high-pressure chamber entrance. Finally, it enters the high-pressure chamber through the one-way valve assembly, maintaining a high pressure state within the enclosed space formed by the plunger and cylinder body. The piston's thrust supports the tensioning guide, thereby adjusting the tension of the timing chain. The hydraulic oil within the tensioner can also flow back to the high-pressure chamber entrance through the outer edge of the one-way valve assembly, or be discharged into the timing chain case through the oil outlet at the top of the plunger, where it is used to lubricate the contact area between the plunger and the tensioning guide.

[0005] During use, the above-mentioned traditional hydraulic tensioner is often unable to achieve accurate pressure sampling at a close distance from the tensioner's high-pressure chamber and its entrance due to the very limited internal space of the timing chain case. As a result, the accuracy of obtaining pressure data from the tensioner's internal chamber is limited. In addition, when measuring the plunger displacement, if the traditional external measurement method is used, it may affect the normal movement of the piston in its cylinder, and thus affect the functional performance of the tensioner. These two problems directly affect the further improvement of tensioner usage data analysis and quality monitoring. Utility Model Content

[0006] In order to facilitate and accurately measure the internal chamber pressure and piston displacement of a hydraulic tensioner, the present application provides a housing structure of a hydraulic tensioner and a hydraulic tensioner.

[0007] In a first aspect, the present application provides a hydraulic tensioner housing structure that adopts the following technical solution:

[0008] A housing structure for a hydraulic tensioner includes a housing body, wherein a mounting hole for mounting a plunger is defined within the housing body, wherein one end of the mounting hole has an opening located on a side surface of the housing body, and the other end of the mounting hole is located within the housing body and communicates with an oil injection passage; a high-pressure chamber is formed at the end of the mounting hole located within the housing body; and a bolt hole is defined in the housing body for inserting a bolt and securing the housing body.

[0009] The housing body is provided with a first fixing hole for mounting the first pressure sensor and a second fixing hole for mounting the displacement sensor;

[0010] The first fixing hole is communicated with the high-pressure chamber; the second fixing hole is located on one side of the mounting hole and extends toward the opening of the mounting hole.

[0011] By adopting the above technical solution, the hole wall and peripheral components of the mounting hole on the shell body form a hydraulic cylinder structure, and a plunger that can move back and forth is installed in the mounting hole. After hydraulic oil is injected into the high-pressure chamber of the mounting hole through the oil injection channel, the pressure of the hydraulic oil can push the plunger to move axially in the mounting hole, thereby pushing the tensioning guide plate to adjust the tension of the timing chain.

[0012] In this application, a first fixing hole and a second fixing hole are provided, and a first pressure sensor is installed in the first fixing hole. The probe of the first pressure sensor can extend into the high-pressure chamber through the first fixing hole, thereby accurately detecting the pressure in the high-pressure chamber and further analyzing the relationship between the tensioning force of the tensioning guide plate in the timing chain system and the pressure value of the hydraulic chamber in the tensioner. A displacement sensor is installed in the second fixing hole, and the probe of the displacement sensor can be connected to the plunger, thereby accurately measuring the displacement of the plunger during reciprocating movement and further analyzing the relationship between the tensioning force of the tensioning guide plate in the timing chain system and the displacement of the plunger in the tensioner. The housing structure of this application ensures the ease of installation and measurement accuracy of both the pressure sensor and the displacement sensor.

[0013] Optionally, a low-pressure oil storage chamber is provided on the back side of the shell body, and the oil injection channel connects the high-pressure chamber and the low-pressure oil storage chamber; a third fixing hole for installing a second pressure sensor is also provided on the shell body; the third fixing hole is connected to the oil injection channel.

[0014] By adopting the above technical solution, a second pressure sensor is installed in the third fixing hole, and the probe of the second pressure sensor can be extended into the oil filling channel through the third fixing hole, so as to accurately detect the pressure at the oil filling channel, and further analyze the relationship between the tensioning force of the tensioning guide plate in the timing chain system and the pressure values ​​of other hydraulic chambers in the tensioner.

[0015] Optionally, the shell body has a first lug and a second lug on both sides of the mounting hole, and the bolt hole is formed on both the first lug and the second lug.

[0016] By adopting the above technical solution, the bolt holes on the first lug and the second lug can be inserted with bolts for installing and fixing the shell body, thereby fixing the tensioner. The above structure ensures that the tensioner is installed with uniform force and a stable connection; and ensures the compactness of the entire shell structure.

[0017] Optionally, a reinforcing rib is fixedly provided between the first lug and the side of the shell body.

[0018] By adopting the above technical solution, the first lug is effectively prevented from breaking, the stability and reliability of the first lug are ensured, and the stability and reliability of the tensioner installation are further ensured.

[0019] Optionally, the front side of the shell body has a protrusion, and the second fixing hole is opened in the protrusion and passes through both sides of the protrusion.

[0020] By adopting the above technical solution, the arrangement of the second fixing hole and the stability of the installation of the displacement sensor are facilitated.

[0021] Optionally, a fastening hole for installing a fastening screw is opened on the protrusion, and the fastening hole is connected to the second fixing hole.

[0022] By adopting the above technical solution, after installing the fastening screw in the fastening hole, it is used to lock the displacement sensor installed in the second fixing hole, which can effectively fix the displacement sensor, ensure its stable operation, and avoid measurement errors caused by loosening.

[0023] Optionally, a notch is provided on the shell body at the opening of the mounting hole and on one side facing the mounting hole.

[0024] By adopting the above technical solution, the notch is utilized to facilitate the connection between the displacement sensor and the plunger in the tensioner, thereby enabling the displacement sensor to accurately measure the displacement of the plunger.

[0025] In a second aspect, the present application provides a hydraulic tensioner that adopts the following technical solution:

[0026] A hydraulic tensioner includes the above-mentioned housing structure; a one-way valve group and a reciprocating plunger are installed in the mounting hole of the housing structure; a first pressure sensor for measuring the hydraulic pressure in the high-pressure chamber is installed in the first fixing hole; a displacement sensor for detecting the displacement of the plunger is installed in the second fixing hole; and a second pressure sensor for measuring the hydraulic pressure in the oil injection channel is installed in the third fixing hole.

[0027] By adopting the above technical solution, it is possible to accurately measure the pressure at the entrance of the high-pressure chamber and the high-pressure chamber inside the tensioner, thereby effectively analyzing the relationship between the tensioning force of the tensioning guide and the pressure of the hydraulic chamber. At the same time, it is also possible to accurately measure the displacement data of the plunger, thereby further analyzing the relationship between the tensioning force of the tensioning guide and the plunger displacement.

[0028] In summary, this application includes at least one of the following beneficial technical effects:

[0029] 1. In the present application, a first fixing hole is provided and a first pressure sensor is installed in the first fixing hole. The probe of the first pressure sensor can be extended into the high-pressure chamber through the first fixing hole, thereby accurately detecting the pressure in the high-pressure chamber and analyzing the relationship between the tensioning force of the tensioning guide plate in the timing chain system and the pressure value of the hydraulic chamber in the tensioner.

[0030] 2. In this application, a displacement sensor is installed in the second fixing hole, and the probe of the displacement sensor can be connected to the plunger, so as to accurately measure the displacement of the plunger during reciprocating movement, and analyze the relationship between the tensioning force of the tensioning guide plate in the timing chain system and the displacement of the plunger in the tensioner.

[0031] 3. In this application, by setting a third fixing hole and installing a second pressure sensor in the third fixing hole, it is possible to accurately measure the pressure at the inlet of the high-pressure chamber inside the tensioner, and analyze the relationship between the tensioning force of the tensioning guide plate in the timing chain system and the pressure value at the inlet of the hydraulic chamber in the tensioner.

[0032] 4. The housing structure in this application facilitates the installation of pressure sensors and displacement sensors, and ensures the compactness of the structure and the accuracy of data measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a first three-dimensional structural schematic diagram of the shell structure in this application.

[0034] Figure 2 It is a second three-dimensional structural schematic diagram of the shell structure in this application.

[0035] Figure 3 This is the first cross-sectional structural schematic diagram of the shell structure in this application.

[0036] Figure 4This is a third three-dimensional structural diagram of the shell structure in this application.

[0037] Figure 5 This is a second cross-sectional structural diagram of the shell structure in this application.

[0038] In the picture:

[0039] 100. Shell body; 11. Mounting hole; 12. Orifice; 13. Oil injection channel; 14. High-pressure chamber; 15. Bolt hole; 16. First fixing hole; 17. Second fixing hole; 18. Third fixing hole; 19. Low-pressure oil storage chamber; 20. First lug; 21. Second lug; 22. Reinforcing rib; 23. Bump; 24. Fastening hole; 25. Notch. DETAILED DESCRIPTION

[0040] The following will be combined with the Figure 1 -Attached Figure 5 The technical solutions in the embodiments of the present invention are clearly and completely described. The described embodiments are only possible technical implementations of the present invention and do not represent all possible implementations. Those skilled in the art can fully combine the embodiments of the present invention to derive other embodiments without inventive work, and these embodiments are also within the scope of protection of the present invention.

[0041] Reference Figure 1 and Figure 2 As shown, a hydraulic tensioner provided in an embodiment of the present application includes a housing structure, a one-way valve group arranged in the housing structure, and a plunger capable of reciprocating movement. The housing structure includes an integrally formed shell body 100; Figure 3 As shown, a mounting hole 11 is opened in the shell body 100, and one end of the mounting hole 11 has an orifice 12 and the orifice 12 is located on one side of the shell body 100, and the other end of the mounting hole 11 is located inside the shell body 100; the one-way valve group and the plunger are installed in the mounting hole 11, and the plunger can reciprocate in the mounting hole 11. The one-way valve group is installed at one end of the mounting hole 11 that penetrates into the shell body 100; the shell body 100 has a first lug 20 and a second lug 21 on both sides of the mounting hole 11, and the first lug 20 is connected to the shell body. A reinforcing rib 22 is fixed to the side of 100, which is used to prevent the first lug 20 from breaking, ensure the stability and reliability of the first lug 20, and further ensure the stability and reliability of the tensioner installation; bolt holes 15 are provided on the first lug 20 and the second lug 21; the bolt holes 15 on the first lug 20 and the second lug 21 can be inserted with bolts for installing and fixing the shell body 100, thereby fixing the tensioner. The above-mentioned left and right fixing structures make the tensioner installation evenly stressed and the connection stable; and ensure the compactness of the entire shell structure.

[0042] Reference Figure 4 and Figure 5 As shown, at the end of the mounting hole 11 inside the shell body 100, a high-pressure chamber 14 is formed by the one-way valve group, the plunger and the hole wall of the mounting hole 11; a low-pressure oil storage chamber 19 is opened on the back side of the shell body 100, and an oil injection channel 13 is opened in the shell body 100, and the two ends of the oil injection channel 13 are respectively connected to the inner end of the mounting hole 11 and the low-pressure oil storage chamber 19; the hydraulic oil in the low-pressure oil storage chamber 19 can flow into the inner end of the mounting hole 11 through the oil injection channel 13, and then enter the high-pressure chamber 14 through the one-way valve group.

[0043] Reference Figure 2 、 Figure 3 and Figure 5 As shown, the housing body 100 is provided with a first fixing hole 16 for mounting a first pressure sensor, a second fixing hole 17 for mounting a displacement sensor, and a third fixing hole 18 for mounting a second pressure sensor. The first fixing hole 16 is connected to the high-pressure chamber 14; the second fixing hole 17 is located on one side of the mounting hole 11 and extends toward the orifice 12 of the mounting hole 11; and the third fixing hole 18 is connected to the oil injection passage 13. A first pressure sensor for measuring the hydraulic pressure within the high-pressure chamber 14 is mounted in the first fixing hole 16; a displacement sensor for detecting the displacement of the plunger is mounted in the second fixing hole 17; and a second pressure sensor for measuring the hydraulic pressure within the oil injection passage 13 is mounted in the third fixing hole 18.

[0044] Further, refer to Figure 1 and Figure 2 As shown, the front side of the housing body 100 has a protrusion 23. The second fixing hole 17 is defined within the protrusion 23 and extends through both sides of the protrusion 23, facilitating the arrangement of the second fixing hole 17 and ensuring the stability of the displacement sensor installation. A small fastening hole 24 is defined in the protrusion 23 for installing a fastening screw. The axial direction of the fastening hole 24 is perpendicular to the axial direction of the second fixing hole 17 and the fastening hole 24 is connected to the second fixing hole 17. After the fastening screw is installed in the fastening hole 24, it is used to lock the displacement sensor installed in the second fixing hole 17, effectively securing the displacement sensor, ensuring its stable operation and avoiding measurement errors caused by loosening. A notch 25 is defined in the housing body 100, located at the opening 12 of the mounting hole 11 and facing the mounting hole 11. This notch 25 facilitates the connection between the displacement sensor and the plunger in the tensioner, thereby enabling the displacement sensor to accurately measure the plunger's displacement.

[0045] In the present application, the first fixing hole 16 and the third fixing hole 18 are arranged in axial parallel intervals, and there is an appropriate center distance between the first fixing hole 16 and the third fixing hole 18; the specific adapted center distance is designed according to the size of the mounting hole 11, and avoids mutual interference between the two pressure sensors to maintain measurement accuracy.

[0046] The implementation principle of this embodiment is as follows: the hole wall and peripheral components of the mounting hole 11 on the housing body 100 form a hydraulic cylinder structure, a reciprocating plunger is installed in the mounting hole 11, and after hydraulic oil is injected into the high-pressure chamber 14 of the mounting hole 11 through the oil injection channel 13, the pressure of the hydraulic oil can push the plunger to move axially in the mounting hole 11, thereby pushing the tensioning guide plate to adjust the tension of the timing chain. In the present application, a first fixing hole 16 and a second fixing hole 17 are provided, and a first pressure sensor is installed in the first fixing hole 16. The probe of the first pressure sensor can be extended into the high-pressure chamber 14 through the first fixing hole 16, thereby accurately detecting the pressure in the high-pressure chamber 14 and further analyzing the relationship between the tensioning force of the tensioning guide in the timing chain system and the pressure value of the hydraulic chamber in the tensioner. A displacement sensor is installed in the second fixing hole 17. The probe of the displacement sensor can be connected to the plunger, thereby accurately measuring the displacement of the plunger during reciprocating movement and further analyzing the relationship between the tensioning force of the tensioning guide in the timing chain system and the displacement of the plunger in the tensioner. A second pressure sensor is installed in the third fixing hole 18. The probe of the second pressure sensor can be extended into the oil injection channel 13 through the third fixing hole 18, thereby accurately detecting the pressure in the oil injection channel 13 and further analyzing the relationship between the tensioning force of the tensioning guide in the timing chain system and the pressure values ​​of other hydraulic chambers in the tensioner. The housing structure of the present application simultaneously ensures the convenience of installation and measurement accuracy of the pressure sensor and the displacement sensor.

[0047] The examples of this specific embodiment are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, any equivalent changes made based on the structure, shape, and principle of this application should be included in the scope of protection of this application.

Claims

1. A housing structure of a hydraulic tensioner, comprising a housing body (100), wherein a mounting hole (11) for mounting a plunger is provided in the housing body (100), wherein one end of the mounting hole (11) has an orifice (12) and the orifice (12) is located on a side surface of the housing body (100), and the other end of the mounting hole (11) is located inside the housing body (100) and is connected to an oil injection channel (13); a high-pressure chamber (14) is formed at the end of the mounting hole (11) located inside the housing body (100); and a bolt hole (15) is provided on the housing body (100) for inserting a bolt and fixing the housing body (100); It is characterized in that The housing body (100) is provided with a first fixing hole (16) for installing a first pressure sensor and a second fixing hole (17) for installing a displacement sensor. The first fixing hole (16) is in communication with the high-pressure chamber (14); the second fixing hole (17) is located on one side of the mounting hole (11) and extends toward the orifice (12) of the mounting hole (11).

2. The housing structure of the hydraulic tensioner according to claim 1, characterized in that: A low-pressure oil storage chamber (19) is provided on the back side of the housing body (100), and the oil injection channel (13) communicates with the high-pressure chamber (14) and the low-pressure oil storage chamber (19); a third fixing hole (18) for mounting a second pressure sensor is also provided on the housing body (100); the third fixing hole (18) is communicated with the oil injection channel (13).

3. The housing structure of the hydraulic tensioner according to claim 1 or 2, characterized in that: The housing body (100) is provided with a first lug (20) and a second lug (21) on both sides of the mounting hole (11), and the first lug (20) and the second lug (21) are both provided with the bolt hole (15).

4. The housing structure of the hydraulic tensioner according to claim 3, characterized in that: A reinforcing rib (22) is fixedly provided between the first lug (20) and the side of the shell body (100).

5. The housing structure of the hydraulic tensioner according to claim 1, characterized in that: The front side of the shell body (100) has a protrusion (23), and the second fixing hole (17) is opened in the protrusion (23) and passes through both sides of the protrusion (23).

6. The housing structure of the hydraulic tensioner according to claim 5, characterized in that: The protrusion (23) is provided with a small fastening hole (24) for installing a fastening screw, and the small fastening hole (24) is connected to the second fixing hole (17).

7. The housing structure of the hydraulic tensioner according to claim 5, characterized in that: A notch (25) is provided on the housing body (100) at the opening (12) of the mounting hole (11) and on one side thereof facing the mounting hole (11).

8. A hydraulic tensioner, characterized in that: The hydraulic tensioner includes the housing structure of claim 2; a one-way valve group and a reciprocating plunger are installed in the mounting hole (11) of the housing structure, a first pressure sensor for measuring the hydraulic pressure in the high-pressure chamber (14) is installed in the first fixing hole (16), a displacement sensor for detecting the displacement of the plunger is installed in the second fixing hole (17), and a second pressure sensor for measuring the hydraulic pressure in the oil injection channel (13) is installed in the third fixing hole (18).

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