Variable displacement hydraulic motor swash plate support structure

Abstract

This invention relates to a swashplate support structure for a variable displacement hydraulic motor, belonging to the field of hydraulic motor technology. This invention abandons traditional arc-surface supports and bearing bush-type supports, employing a combination of upper and lower bearing seats, tapered roller bearings, rocker arms, and a rotating shaft to support the swashplate. The cooperation between the tapered roller bearings and the rotating shaft significantly reduces friction. Simultaneously, adjusting nuts allow for the adjustment of the positions of the two tapered roller bearings, aligning the swashplate with the flange's central axis, eliminating gaps, improving mechanical efficiency, and extending service life. A reinforcement mechanism is also included, with reinforcement rods engaging the adjustment grooves of the lower bearing seat to reinforce the rocker arm and lower bearing seat, enhancing swashplate stability. Damping sleeves delay the reinforcing rods' return time, preventing them from directly engaging the adjustment grooves during movement. Furthermore, when the adjusting nut releases the pressure plate's limit, the reinforcement rods can be directly removed from the adjustment grooves, facilitating disassembly.

Description

Technical Field

[0001] This invention relates to the field of hydraulic motor technology, and in particular to a swashplate support structure for a variable displacement hydraulic motor. Background Technology

[0002] Variable displacement hydraulic motors achieve variable displacement by changing the swashplate angle, which requires adding a swashplate support structure inside the hydraulic motor to support the swashplate. The traditional swashplate support uses an arc surface support.

[0003] However, the aforementioned existing technologies have the following technical defects:

[0004] The high friction between the swashplate and the flange results in low mechanical efficiency. This can be addressed by using bearing bushes for support in variable hydraulic motors. However, in practical applications, there is a gap between the bearing bushes and the swashplate and flange, causing wear on the bearing bushes and reducing the service life of the hydraulic motor.

[0005] In summary, there is still room for improvement in the existing technology to extend the service life of hydraulic motors. Therefore, those skilled in the art have proposed a swashplate support device that can improve the service life of hydraulic motors. Summary of the Invention

[0006] To address the aforementioned problems, this application provides a variable hydraulic motor swashplate support structure, employing the following technical solution:

[0007] The system includes a support mechanism. Two lower bearing seats are symmetrically installed on the upper side of the support mechanism. The lower bearing seats are provided with matching upper bearing seats and have tapered tooth holes formed on their sides. Adjusting nuts are provided in the tapered tooth holes and are threadedly connected to them. A tapered roller bearing is provided on one side of the adjusting nut. A matching rotating shaft is provided in the tapered roller bearing. A rocker arm is installed at the end of the rotating shaft.

[0008] The side of the lower bearing housing is provided with a semi-circular arc groove around the tapered roller bearing, and the inner side of the arc groove is provided with several evenly distributed adjustment grooves.

[0009] It also includes a reinforcement mechanism, which includes a lower cavity inside the rocker arm. A cylinder with one end open is installed in the lower cavity. A damping pad is installed on the inner wall of the cylinder. A telescopic rod is installed at the center of the other inner wall of the cylinder. A compression plate with its side tightly attached to the damping pad is installed at the end of the telescopic rod. A reinforcement rod with a spherical end that is inserted into an adjustment groove is installed at the center of the side of the compression plate. A main spring is installed inside the cylinder on one side of the compression plate.

[0010] Preferably, a swashplate is mounted on the lower ends of both rocker arms.

[0011] Preferably, the rotating shaft has a cavity inside, a limit plate is slidably installed inside the cavity, and a secondary spring is installed inside the cavity on one side of the limit plate.

[0012] Preferably, the end of the rotating shaft is provided with a storage groove, and one end of the limiting plate extends into the storage groove and is rotatably mounted with a pressure plate that is compatible with it.

[0013] Preferably, the inner wall of the rotating shaft cavity is equipped with a connecting groove that communicates with the lower cavity, and hydraulic oil is provided in the cavity.

[0014] Preferably, a return spring is connected between the cylinder and the inner wall of the lower cavity.

[0015] Preferably, the side of the adjusting nut has several evenly distributed fixing holes, and a fixing mechanism is installed on the upper side of the upper bearing seat.

[0016] Preferably, the fixing mechanism includes a stop plate, and an adjusting plate is rotatably mounted on the side of the stop plate.

[0017] Preferably, the side of the adjusting plate is provided with a threaded hole, and a screw adapted to it is provided in the threaded hole. The end of the screw is rotatably installed with an insertion hole that is engaged in a fixing hole.

[0018] Preferably, a limiting rod is installed on the side of the socket, which is slidably connected to the adjusting plate, and a hexagonal nut is installed on the other end of the screw.

[0019] In summary, this application includes at least one of the following beneficial technical effects:

[0020] I. This invention abandons the traditional arc surface support and bearing bush support, and adopts a combination of upper and lower bearing seats, tapered roller bearings, rocker arms and rotating shafts to support the swashplate. The cooperation of tapered roller bearings and rotating shafts can significantly reduce friction. At the same time, the position of the two tapered roller bearings can be adjusted by using adjusting nuts to make the swashplate coincide with the center axis of the flange, eliminating gaps, improving the mechanical efficiency of the product and extending its service life.

[0021] Second, the present invention also includes a reinforcement mechanism, which works in conjunction with the support mechanism to allow the reinforcement rod to be inserted into the adjustment groove of the lower bearing seat, thereby reinforcing the rocker arm and the lower bearing seat and enhancing the stability of the swashplate. At the same time, the damping sleeve delays the recovery time of the reinforcement rod, so that the reinforcement rod will not be directly stuck in the adjustment grooves during the movement. Also, when the adjusting nut releases the limit on the pressure plate, the reinforcement rod can be moved directly out of the adjustment groove, making it convenient to disassemble the device. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Figure 1 This is a schematic diagram of the structure of the present invention.

[0024] Figure 2 This is a schematic diagram of the support mechanism structure of the present invention.

[0025] Figure 3 This is a schematic diagram of the disassembled support mechanism of the present invention.

[0026] Figure 4 This is a cross-sectional view of the present invention.

[0027] Figure 5 This is a schematic diagram of the fixing mechanism of the present invention.

[0028] Figure 6 This is a schematic diagram of the reinforcement mechanism structure of the present invention.

[0029] Figure 7 This is a schematic diagram of the lower bearing housing structure of the present invention.

[0030] In the diagram: 1. Support mechanism; 101. Flange; 102. Lower bearing seat; 103. Upper bearing seat; 104. Adjusting nut; 105. Rocker arm; 106. Shaft; 107. Tapered roller bearing; 108. Arc groove; 109. Adjusting groove; 110. Fixing hole; 2. Reinforcing mechanism; 201. Lower cavity; 202. Return spring; 203. Cylinder; 204. Telescopic rod; 205. Compression plate; 206. Reinforcing rod; 207. Main spring; 208. Damping pad; 209. Limiting plate; 210. Secondary spring; 211. Storage groove; 212. Pressure plate; 213. Connecting groove; 3. Fixing mechanism; 301. Stop plate; 302. Adjusting plate; 303. Screw; 304. Insertion hole; 305. Limiting rod; 306. Hexagonal nut; 4. Swashplate. Detailed Implementation

[0031] The following combination Figure 1 - Figure 7 The embodiments of the present invention will be described in detail below.

[0032] This application discloses a variable hydraulic motor swashplate support structure, which abandons the traditional arc surface support and bearing bush support. Instead, it uses an upper and lower bearing housing, tapered roller bearings, rocker arms, and a rotating shaft combination to support the swashplate. The tapered roller bearings and rotating shaft work together to significantly reduce friction. At the same time, the position of the two tapered roller bearings can be adjusted by using an adjusting nut to make the swashplate coincide with the center axis of the flange, eliminating gaps, improving the mechanical efficiency of the product, and extending its service life.

[0033] Example 1:

[0034] like Figures 1-2As shown, the support mechanism includes a support mechanism 1. Two lower bearing seats 102 are symmetrically installed on the upper side of the support mechanism 1. An upper bearing seat 103 adapted to the lower bearing seat 102 is provided on the lower bearing seat 102 and a conical tooth hole is formed on the side. An adjusting nut 104 threadedly connected to the conical tooth hole is provided in the conical tooth hole. The lower bearing seat 102 and the upper bearing seat 103 are fixed by bolts. At the same time, the adjusting nut 104 is threadedly connected to the inner wall of the conical tooth hole. The position of the adjusting nut 104 in the bearing hole can be adjusted by rotating the adjusting nut 104.

[0035] like Figures 2-4 As shown, a tapered roller bearing 107 is provided on one side of the adjusting nut 104. A rotating shaft 106 adapted to the tapered roller bearing 107 is provided inside the tapered roller bearing 107. A rocker arm 105 is installed at the end of the rotating shaft 106. A swashplate 4 is installed at the lower end of the two rocker arms 105. When the swashplate 4 is tilted, the rotating shaft 106 is deflected in the tapered roller bearing 107 by the rocker arms 105, thus achieving tilting.

[0036] like Figure 1 , Figure 3 and Figure 5 As shown, the side of the adjusting nut 104 has several evenly distributed fixing holes 110. The upper bearing seat 103 is equipped with a fixing mechanism 3. The fixing mechanism 3 includes a stop plate 301. An adjusting plate 302 is rotatably mounted on the side of the stop plate 301. The side of the adjusting plate 302 is provided with an insertion hole 304 that can be inserted into a fixing hole 110. After the adjusting nut 104 has rotated, the insertion hole 304 of the fixing mechanism 3 is pulled into one of the fixing holes 110 on the same side of the adjusting nut 104 to prevent the adjusting nut 104 from rotating on its own.

[0037] In summary, during installation, after placing the two rotating shafts 106 inside the two tapered roller bearings 107, screw the two adjusting nuts 104 into the bearing holes respectively, adjust the clearance using the two adjusting nuts 104, adjust the position of the two tapered roller bearings 107 in the bearing holes, so that the central axis of the swashplate 4 coincides with the central axis of the flange 101, and then insert the insertion hole 304 of the fixing mechanism 3 into one of the fixing holes 110 of the adjusting nut 104 on the same side to fix it and prevent it from rotating.

[0038] like Figure 1 and Figure 6 As shown, it also includes a reinforcement mechanism 2, which includes a lower cavity 201 opened inside the rocker arm 105. A cylinder 203 with one end open is provided in the lower cavity 201. A damping pad 208 is installed on the inner wall of the cylinder 203. The damping pad 208 is used to dampen objects that are in close contact with it and are moving.

[0039] like Figure 6As shown, a telescopic rod 204 is installed at the center of the other inner wall of the cylinder 203. A compression plate 205 with its side tightly attached to the damping pad 208 is installed at the end of the telescopic rod 204. A main spring 207 is provided inside the cylinder 203 on one side of the compression plate 205. When the compression plate 205 moves, it will compress the telescopic rod 204 and the main spring 207. Afterwards, the main spring 207 will rebound, causing the telescopic rod 204 to extend and the compression plate 205 to return to its original position.

[0040] like Figure 7 As shown, a semi-circular arc groove 108 is formed on the side of the lower bearing housing 102 around the tapered roller bearing 107. Several evenly distributed adjustment grooves 109 are formed on the inner side of the arc groove 108. A reinforcing rod 206 with a spherical end is installed at the center of the side of the compression plate 205 and is inserted into the adjustment groove 109. The reinforcing rod 206 is inserted into the adjustment groove 109 to enhance the stability between the rocker arm 105 and the lower bearing housing 102. At the same time, the spherical end of the reinforcing rod 206 will be squeezed out of the adjustment groove 109 by the inner wall of the adjustment groove 109 when the rocker arm 105 rotates.

[0041] In summary, the reinforcing rod 206 is engaged in the adjusting groove 109, which enhances the stability between the rocker arm 105 and the lower bearing seat 102. When the swashplate 4 tilts, the rocker arm 105 rotates, and the ball head of the compression plate 205 is squeezed by the inner wall of the adjusting groove 109, causing the reinforcing rod 206 to move towards the lower cavity 201. The compression plate 205 compresses the telescopic rod 204 and the main spring 207. During the deflection process, the main spring 207 will give the compression plate 205 a rebound force. Due to the damping of the damping pad 208, the compression plate 205 moves slowly until the predetermined tilt angle is reached. After that, the compression plate 205 moves slowly and drives the reinforcing rod 206 to re-engage in the aligned adjusting groove 109.

[0042] like Figure 6 As shown, a chamber is provided inside the rotating shaft 106, and a limiting plate 209 is slidably arranged inside the chamber. A secondary spring 210 is provided on one side of the limiting plate 209 inside the chamber. The limiting plate 209 will compress the secondary spring 210 as it moves toward the secondary spring 210. Afterward, the secondary spring 210 will rebound and drive the limiting plate 209 to return to its original position.

[0043] like Figure 6 As shown, a storage groove 211 is provided at the end of the rotating shaft 106. One end of the limiting plate 209 extends into the storage groove 211 and is rotatably installed with a pressure plate 212 that is compatible with it. When the adjusting nut 104 is screwed into the bearing hole, it will squeeze the pressure plate 212, and the limiting plate 209 will move through the pressure plate 212.

[0044] like Figure 6As shown, the inner wall of the inner cavity of the rotating shaft 106 is equipped with a connecting groove 213 that communicates with the lower cavity 201. Hydraulic oil is provided in the cavity. A return spring 202 is connected between the cylinder 203 and the inner wall of the lower cavity 201. The moving limit plate 209 will press the hydraulic oil in the cavity into the lower cavity 201 through the connecting groove 213, push the cylinder 203 to move, and at the same time stretch the return spring 202. Then, when the return spring 202 shortens, it will pull the cylinder 203 to press the hydraulic oil in the lower cavity 201 back into the cavity.

[0045] In summary, when the adjusting nut 104 is screwed into the bearing hole, it presses the pressure plate 212 into the receiving groove 211. At the same time, the limiting plate 209 compresses the secondary spring 210, and the hydraulic oil in the chamber is pressed into the lower chamber 201 through the connecting groove 213. This pushes the cylinder 203 to move and lengthens the return spring 202, while the reinforcing rod 206 is inserted into the aligned adjusting groove 109. When the adjusting nut 104 is disassembled, the pressure plate 212 is no longer compressed, and the secondary spring 210 rebounds, causing the limiting plate 209 and the pressure plate 212 to return to their original positions. At the same time, the return spring 202 shortens, causing the cylinder 203 to move and press the hydraulic oil in the lower chamber 201 back into the chamber, while the reinforcing rod 206 moves out of the inserted adjusting groove 109.

[0046] Example 2:

[0047] Based on Example 1, such as Figure 5 As shown, the adjusting plate 302 has a threaded hole on its side, and a screw 303 that is compatible with it is provided in the threaded hole. The end of the screw 303 is rotatably connected to the insertion hole 304. Rotating the screw 303 to move it can drive the insertion hole 304 to move, thereby adjusting the lateral position of the insertion hole 304. Even if the adjusting nut 104 is in various positions in the bearing hole, the insertion hole 304 can still be inserted into the fixing hole 110.

[0048] like Figure 5 As shown, a limiting rod 305 is installed on the side of the socket 304, passing through the adjusting plate 302 and slidably connected thereto. A hexagonal nut 306 is installed on the other end of the screw 303. The limiting rod 305 limits the socket 304, preventing the socket 304 from rotating when the screw 303 rotates. At the same time, the hexagonal nut 306 allows the user to rotate the screw 303 with a wrench.

[0049] This application also discloses a method for using a variable hydraulic motor swashplate support structure, the steps of which are as follows:

[0050] S1. Structural Installation: The swashplate 4 is aligned with the central axis of the flange 101 via the support mechanism 1. Specifically, after placing the two shafts 106 inside the two tapered roller bearings 107, the two tapered roller bearings 107 are placed on the two lower bearing seats 102 respectively. Then, the two upper bearing seats 103 are installed. At this time, the two tapered roller bearings 107 are respectively in the two bearing holes. The two adjusting nuts 104 are screwed into the bearing holes respectively. The clearance is adjusted using the two adjusting nuts 104 to adjust the position of the two tapered roller bearings 107 in the bearing holes, so that the central axis of the swashplate 4 is aligned with the central axis of the flange 101. The installation is then complete.

[0051] S2. Structural reinforcement: The adjusting nut 104 and rocker arm 105 are reinforced by the reinforcement mechanism 2 and the fixing mechanism 3 respectively. Specifically, two stop plates 301 are installed on the two upper bearing seats 103 respectively, and the corresponding insertion holes 304 are inserted into the fixing holes 110 of the adjusting nut 104 on the same side to prevent the adjusting nut 104 from rotating. At the same time, when the adjusting nut 104 is screwed into the bearing hole, the pressure plate 212 will be pressed into the receiving groove 211. At the same time, the hydraulic oil in the chamber is pressed into the lower chamber 201 through the connecting groove 213 while the limiting plate 209 compresses the secondary spring 210. This pushes the cylinder 203 to move and stretch the return spring 202, while the reinforcement rod 206 is inserted into the aligned adjustment groove 109, thus reinforcing the rocker arm 105 and the lower bearing seat 102 and enhancing the stability of the swashplate 4.

[0052] S3. Tilt Protection: After the swashplate 4 tilts, the reinforcing rod 206 can still reinforce the swashplate 4 within the other adjustment slots 109. Specifically, when the swashplate 4 tilts, the rocker arm 105 rotates, and the ball head of the compression plate 205 is squeezed by the inner wall of the adjustment slot 109, causing the reinforcing rod 206 to move towards the lower cavity 201. The compression plate 205 compresses the telescopic rod 204 and the main spring 207. During the deflection process, the main spring 207 will give the compression plate 205 a rebound force. Due to the damping of the damping pad 208, the compression plate 205 moves slowly until the predetermined tilt angle is reached. After that, the compression plate 205 moves slowly, causing the reinforcing rod 206 to re-engage in the aligned adjustment slot 109.

[0053] S4. Structural disassembly: During the disassembly of the adjusting nut 104, the reinforcing rod 206 is moved out of the adjusting groove 109 for easy disassembly. Specifically, when the adjusting nut 104 is disassembled, the pressure plate 212 is no longer compressed, and the secondary spring 210 rebounds to restore the positions of the limiting plate 209 and the pressure plate 212. At the same time, the reset spring 202 shortens and moves the cylinder 203 to press the hydraulic oil in the lower cavity 201 back into the cavity, while the reinforcing rod 206 is moved out of the adjusting groove 109.

[0054] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and not restrictive.

[0055] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A variable displacement hydraulic motor swashplate support structure, characterized in that: The support mechanism (1) includes two lower bearing seats (102) symmetrically installed on the upper side of the support mechanism (1). The lower bearing seats (102) are provided with upper bearing seats (103) that are adapted to them, and tapered tooth holes are formed on the sides of the lower bearing seats (102) and the upper bearing seats (103). An adjusting nut (104) that is threadedly connected to the tapered tooth hole is provided in the tapered tooth hole. A tapered roller bearing (107) is provided on one side of the adjusting nut (104). A rotating shaft (106) that is adapted to the tapered roller bearing (107) is provided in the tapered roller bearing (107). A rocker arm (105) is installed at the end of the rotating shaft (106). The side of the lower bearing housing (102) is provided with a semi-circular arc groove (108) around the tapered roller bearing (107), and the inner side of the arc groove (108) is provided with a number of evenly distributed adjustment grooves (109). It also includes a reinforcement mechanism (2), which includes a lower cavity (201) inside the rocker arm (105). A cylinder (203) with one end open is provided in the lower cavity (201). A damping pad (208) is installed on the inner wall of the cylinder (203). A telescopic rod (204) is installed at the center of the other inner wall of the cylinder (203). A compression plate (205) with its side tightly attached to the damping pad (208) is installed at the end of the telescopic rod (204). A reinforcement rod (206) with a spherical end that is inserted into the adjustment groove (109) is installed at the center of the side of the compression plate (205). A main spring (207) is provided inside the cylinder (203) on one side of the compression plate (205). The lower ends of the two rocker arms (105) are jointly equipped with a swashplate (4); The rotating shaft (106) has a cavity inside, a limit plate (209) is slidably installed inside the cavity, and a secondary spring (210) is installed on one side of the limit plate (209) inside the cavity. The end of the rotating shaft (106) is provided with a storage groove (211), and one end of the limiting plate (209) extends into the storage groove (211) and is rotatably installed with a pressure plate (212) that is compatible with it. The inner wall of the inner cavity of the rotating shaft (106) is equipped with a connecting groove (213) that communicates with the lower cavity (201), and hydraulic oil is provided in the cavity.

2. A swash plate support structure for a variable displacement hydraulic motor according to claim 1, characterized by: A return spring (202) is connected between the cylinder (203) and the inner wall of the lower cavity (201).

3. A swash plate support structure for a variable displacement hydraulic motor according to claim 2, characterized by: The side of the adjusting nut (104) has several evenly distributed fixing holes (110), and the upper bearing seat (103) is equipped with a fixing mechanism (3).

4. A swash plate support structure for a variable displacement hydraulic motor according to claim 3, characterized by: The fixing mechanism (3) includes a stop plate (301), and an adjusting plate (302) is rotatably mounted on the side of the stop plate (301).

5. A swash plate support structure for a variable displacement hydraulic motor according to claim 4, characterized by: The side of the adjusting plate (302) is provided with a threaded hole, and a screw (303) adapted to it is provided in the threaded hole. The end of the screw (303) is rotatably installed with an insertion hole (304) that is inserted into a fixing hole (110).

6. A swash plate support structure for a variable displacement hydraulic motor according to claim 5, characterized by: A limiting rod (305) is installed on the side of the socket (304) and is slidably connected to the adjusting plate (302), and a hexagonal nut (306) is installed on the other end of the screw (303).

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