HST hydraulic continuously variable transmission

Abstract

The utility model provides an HST hydraulic continuously variable transmission which comprises a transmission body, a piston mechanism and an operating mechanism are further installed on the left portion of the front side face of the transmission body, and the right side of the piston mechanism is connected with the operating mechanism. The operating mechanism comprises an operating connecting rod, a feedback rod, an operating valve element, an operating valve body and a sealing ring, the operating valve element is further sleeved with the sealing ring, the head of the feedback rod makes contact with the circumferential face of the sealing ring, and the operating connecting rod is fixedly connected with the front end of the operating valve element. The piston mechanism comprises a sealing cylinder, a limiting rod, a large piston, a large spring and a sealing cover, the limiting rod and the large piston are arranged in the sealing cylinder, the limiting rod is slidably sleeved with the large piston, the limiting rod is further sleeved with the large spring, and the tail end of the feedback rod is arranged on the side edge of the large piston. The large spring is combined with the oil pressure to push the variable, the reaction is more sensitive, the load is lower, and the service life of the HST is effectively guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of agricultural machinery technology, and in particular to an HST hydraulic continuously variable transmission. Background Technology

[0002] In agricultural machinery, HST hydraulic transmission has been widely used in many small and medium-sized machines, such as tracked harvesters, wheeled harvesters, and tracked corn harvesters; HST hydraulic continuously variable transmission is a closed-loop system formed by a variable pump, a fixed displacement motor, and a replenishing pump;

[0003] With the diversification of HST agricultural machinery market applications and the variability of machinery operating environments, such as Figure 7-9 As shown, the existing displacement HST can no longer meet the usage requirements of some complete machines. Matching with complete machines with a low safety factor will only reduce the service life of the HST. Therefore, a new structure of large displacement HST has been redesigned to meet the market demand for large displacement and high power. Utility Model Content

[0004] The present invention aims to provide an HST hydraulic continuously variable transmission that overcomes or at least partially solves the above-mentioned problems.

[0005] To achieve the above objectives, the technical solution of this utility model is specifically implemented as follows:

[0006] This utility model provides an HST hydraulic continuously variable transmission, including a transmission body, on which an input shaft and an output shaft are respectively mounted. The transmission body also includes a rocker support, a needle roller bearing, and a rocker. The rocker support is fixedly installed on the inner side wall of the transmission body. The needle roller bearing is mounted on the rocker support and is tightly connected to the rocker on the other side of the needle roller bearing. A piston mechanism and an operating mechanism are also installed on the left side of the front side of the transmission body. The rocker is connected to the piston mechanism. The operating mechanism is connected to the right side of the piston mechanism. The other side of the rocker is connected to the piston mechanism.

[0007] The operating mechanism includes an operating connecting rod, a feedback rod, an operating valve core, an operating valve body, and a sealing ring. The operating valve core is installed inside the operating valve body, and a sealing ring is also fitted on the operating valve core. The oil flow and oil cut-off are achieved by rotating the sealing ring. The feedback rod is installed on the left side of the operating valve body and is rotatably connected to the operating valve body through the connecting rod. The operating connecting rod is installed on the front side of the operating valve body. The head of the feedback rod contacts the circumferential surface of the sealing ring. The operating connecting rod is fixedly connected to the front end of the operating valve core.

[0008] The piston mechanism includes a sealing cylinder, a limiting rod, a large piston, a large spring, and a sealing cover. The sealing cylinder is equipped with a limiting rod and a large piston. The large piston is slidably sleeved on the limiting rod. The limiting rod is also sleeved with a large spring, which is positioned between the limiting rod and the large piston. The top end of the limiting rod is fixedly connected to the sealing cover, which is installed at the top end of the sealing cylinder. The tail end of the feedback rod passes through the sealing cylinder and is positioned to the side of the large piston.

[0009] As a further embodiment of this invention, a notch is provided on the annular side of the large piston, and the tail end of the feedback rod is disposed within the notch.

[0010] As a further embodiment of this utility model, grooves are provided in both the upper and lower parts of the large piston, and the large spring is disposed in the grooves.

[0011] As a further embodiment of this utility model, two sets of spring seats are also sleeved and fixed on the limiting rod, and the two sets of spring seats are respectively arranged on the upper and lower sides of the two large springs.

[0012] As a further embodiment of this utility model, an adjusting shim is also fitted on the limiting rod, and the adjusting shim is disposed between the two spring seats.

[0013] This utility model provides an HST hydraulic continuously variable transmission, which has the following advantages: the frictional resistance is smaller and more stable due to the needle roller bearing structure, and the large spring combined with oil pressure drives the variable, resulting in a more sensitive response, lower load, and effectively ensuring the service life of the HST. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 This is a cross-sectional view of the present invention.

[0017] Figure 3 This is a schematic diagram of the connection structure between the operating mechanism and the piston mechanism in this utility model.

[0018] Figure 4 This is a schematic diagram of the operating mechanism in this utility model.

[0019] Figure 5This is a schematic diagram of the piston mechanism in this utility model.

[0020] Figure 6 This is a diagram of the oil circuit system of this utility model.

[0021] Figure 7 This is a schematic diagram of the structure of an existing displacement HST hydraulic continuously variable transmission.

[0022] Figure 8 This is a cross-sectional view of an existing displacement HST hydraulic continuously variable transmission.

[0023] Figure 9 This is a system diagram of an existing displacement HST hydraulic continuously variable transmission.

[0024] In the diagram: 1. Operating mechanism; 2. Piston mechanism; 3. Gearbox body; 4. Swing support; 5. Needle roller bearing; 6. Swing; 11. Operating connecting rod; 12. Feedback rod; 13. Operating valve core; 14. Operating valve body; 15. Sealing ring; 21. Sealing cylinder; 22. Limiting rod; 23. Large piston; 24. Large spring; 25. Sealing cover; 31. Input shaft; 32. Output shaft. Detailed Implementation

[0025] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0026] See Figure 1-6 This utility model provides an HST hydraulic continuously variable transmission, including a transmission body 3. An input shaft 31 and an output shaft 32 are respectively installed on the transmission body 3. The transmission body 3 is also provided with a rocker support 4, a needle roller bearing 5 and a rocker 6. The rocker support 4 is fixedly installed on the inner side wall of the transmission body 3. The needle roller bearing 4 is installed on the rocker support 4 and the rocker 6 is tightly connected to the other side of the needle roller bearing 5. A piston mechanism 2 and an operating mechanism 1 are also installed on the left side of the front side of the transmission body 3. The rocker 6 is connected to the piston mechanism 2. The operating mechanism 1 is connected to the right side of the piston mechanism 2 and the other side of the rocker 6 is connected to the piston mechanism 2.

[0027] The operating mechanism 1 includes an operating connecting rod 11, a feedback rod 12, an operating valve core 13, an operating valve body 14, and a sealing ring 15. The operating valve core 13 is installed inside the operating valve body 14, and the sealing ring 15 is also fitted on the operating valve core 13. The oil supply and oil cut-off are achieved by rotating the sealing ring 15. The feedback rod 12 is installed on the left side of the operating valve body 14 and is rotatably connected to the operating valve body 14 through the connecting rod. The operating connecting rod 11 is installed on the front side of the operating valve body 14. The head of the feedback rod 12 contacts the circumferential surface of the sealing ring 15. The operating connecting rod 11 is fixedly connected to the front end of the operating valve core 13.

[0028] The piston mechanism 2 includes a sealing cylinder 21, a limiting rod 22, a large piston 23, a large spring 24, and a sealing cover 25. The sealing cylinder 21 is equipped with a limiting rod 22 and a large piston 23. The large piston 23 is slidably sleeved on the limiting rod 22. The large spring 24 is also sleeved on the limiting rod 22 and is located between the limiting rod 22 and the large piston 23. The top end of the limiting rod 22 is fixedly connected to the sealing cover 25, which is installed at the top end of the sealing cylinder 21. The tail end of the feedback rod 12 passes through the sealing cylinder 21 and is positioned on the side of the large piston 23. By changing the original small piston to a large piston 23 and increasing the spring 24, the thrust can be increased, the response time and sensitivity can be enhanced, and the safety life can be improved.

[0029] The large piston 23 has a notch on its annular side, and the tail end of the feedback rod 12 is placed in the notch. The large piston 23 has grooves in both its upper and lower parts, and the large spring 24 is placed in the grooves to facilitate the matching connection between the feedback rod 12 and the large piston 23, thereby improving the sensitivity of the feedback.

[0030] Two sets of spring seats are also fixedly fitted on the limit rod 22, and the two sets of spring seats are respectively set on the upper and lower sides of the two large springs 24. An adjusting shim is also fitted on the limit rod 22, and the adjusting shim is set between the two spring seats. By setting the adjusting shim, the discharge volume is limited. It can be used for various machine models and facilitates production organization.

[0031] In use, the engine is connected to the gearbox, and the gearbox is connected to the input shaft 31 of the gearbox body 3. The input shaft 31 rotates without output. Then, the small piston of the gearbox body 3 controls the large piston 23, and the large piston 23 controls the pump piston. One moves forward and the other moves backward. The two options correspond to the left and right of the large piston 23. The forward or backward movement of the pump end corresponds to the forward and backward movement of the output shaft 32.

[0032] Manually moving the operating connecting rod 11 left or right rotates the operating valve core 13, opening the oil passage to the large piston 23 and starting to supply oil to it. The oil enters the large piston 23, flowing to its left and right sides, causing the piston 23 to move left or right along the limit rod 22, determined by the direction of the operating connecting rod 11. The large piston 23 then moves left or right along the limit rod 22, compressing the large spring 24 and generating a rebound force. After the large piston 23 begins to move, the feedback rod 12 is activated, causing the sealing ring 15 to rotate slowly, thus cutting off the oil supply. The angle of the operating connecting rod 11 corresponds to the oil flow rate of the large piston 23, while the feedback rod 12 activates the sealing ring to stop the oil flow. The large spring 24 returns to its original shape, and the resulting elastic force resets the large piston 23. This method features low load and high sensitivity.

[0033] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. An HST hydraulic continuously variable transmission, comprising a transmission body (3), characterized in that, The transmission body (3) is equipped with an input shaft (31) and an output shaft (32). The transmission body (3) is also equipped with a rocker support (4), a needle roller bearing (5) and a rocker (6). The rocker support (4) is fixedly installed on the inner side wall of the transmission body (3). The needle roller bearing (5) is installed on the rocker support (4) and the rocker (6) is tightly connected to the other side of the needle roller bearing (5). The left side of the front side of the transmission body (3) is also equipped with a piston mechanism (2) and an operating mechanism (1). The rocker (6) is connected to the piston mechanism (2). The operating mechanism (1) is connected to the right side of the piston mechanism (2). The other side of the rocker (6) is connected to the piston mechanism (2). The operating mechanism (1) includes an operating connecting rod (11), a feedback rod (12), an operating valve core (13), an operating valve body (14), and a sealing ring (15). The operating valve core (13) is installed inside the operating valve body (14), and a sealing ring (15) is also fitted on the operating valve core (13). The oil flow and oil cut-off are achieved by rotating the sealing ring (15). The feedback rod (12) is installed on the left side of the operating valve body (14) and is rotatably connected to the operating valve body (14) through the connecting rod. The operating connecting rod (11) is installed on the front side of the operating valve body (14). The head of the feedback rod (12) contacts the circumferential surface of the sealing ring (15). The operating connecting rod (11) is fixedly connected to the front end of the operating valve core (13). The piston mechanism (2) includes a sealing cylinder (21), a limiting rod (22), a large piston (23), a large spring (24), and a sealing cover (25). The sealing cylinder (21) is provided with a limiting rod (22) and a large piston (23). The large piston (23) is slidably sleeved on the limiting rod (22). The limiting rod (22) is also sleeved with a large spring (24), and the large spring (24) is located between the limiting rod (22) and the large piston (23). The top end of the limiting rod (22) is fixedly connected to the sealing cover (25). The sealing cover (25) is installed at the top end of the sealing cylinder (21). The tail end of the feedback rod (12) passes through the sealing cylinder (21) and is placed on the side of the large piston (23).

2. The HST hydraulic continuously variable transmission according to claim 1, characterized in that, The large piston (23) has a notch on its annular side, and the tail end of the feedback rod (12) is located in the notch.

3. The HST hydraulic continuously variable transmission according to claim 2, characterized in that, The large piston (23) has grooves in both its upper and lower parts, and the large spring (24) is disposed in the grooves.

4. The HST hydraulic continuously variable transmission according to claim 1, characterized in that, Two sets of spring seats are also sleeved and fixed on the limiting rod (22), and the two sets of spring seats are respectively set on the upper and lower sides of the two large springs (24).

5. An HST hydraulic continuously variable transmission according to claim 4, characterized in that, An adjusting shim is also fitted on the limiting rod (22), and the adjusting shim is positioned between the two spring seats.

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