Saddle lifting system for a towing vehicle and method of operation thereof

Abstract

The present application belongs to the technical field of trackless land vehicles, in particular to a tractor, and more particularly to a saddle lifting system for the tractor and a working method thereof. The saddle lifting system for the tractor is provided with a hydraulic rod of an oil cylinder assembly, which drives a lifting frame to be raised upward when the hydraulic rod is lifted, so that the height of the saddle is lifted, and a clamping ring is sleeved on the hydraulic rod and moves according to the lifting distance of the hydraulic rod, so as to reduce the lateral load of the hydraulic rod and avoid stress deformation damage of the hydraulic rod.

Description

Technical Field

[0001] This invention belongs to the field of trackless land vehicle technology, specifically relating to tractor vehicles, and more particularly to a saddle lifting system for tractor vehicles and its working method. Background Technology

[0002] As an important piece of equipment in port transportation, the tractor unit is equipped with a saddle to connect with the trailer. To improve the compatibility of the trailer connection, related technologies often equip the saddle with a hydraulic system for lifting. The height of the saddle is adjusted by extending and retracting the hydraulic rod. However, the above-mentioned setup still has some problems. Since the trailer and the tractor unit are connected through the saddle and the towing hook, they cannot be completely fixed together, and there will be a certain amount of play. This will cause the trailer to have a certain lag when braking and starting, resulting in instantaneous impact and causing lateral load on the extended hydraulic rod. Over time, this will lead to stress deformation and damage to the hydraulic rod.

[0003] Therefore, due to the technical problem that the hydraulic rod will be subjected to greater lateral loads after its extension length increases, leading to stress deformation damage, it is necessary to design a saddle lifting system for tractor vehicles and its working method.

[0004] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Summary of the Invention

[0005] This disclosure provides at least one saddle lifting system for a tractor and its operating method.

[0006] In a first aspect, embodiments of this disclosure provide a saddle lifting system for a tractor unit, comprising: A drive mechanism and a saddle mechanism connected to the drive mechanism, the drive mechanism being configured to drive the saddle mechanism to rise and fall so that the height of the saddle within the saddle mechanism is adapted to the traction hook; The drive mechanism includes: at least one pair of hydraulic cylinder assemblies; The top of the hydraulic rod of the cylinder assembly is hinged to the lifting frame inside the saddle mechanism; The lifting frame is rotatably connected to the vehicle frame; The saddle is connected to the lifting frame; When the hydraulic rod of the cylinder assembly rises, it causes the lifting frame to tilt upwards, thereby increasing the height of the saddle. The clamping ring on the outer sleeve of the hydraulic rod moves according to the distance the hydraulic rod rises, so as to reduce the lateral load on the hydraulic rod.

[0007] In one alternative embodiment, the cylinder assembly includes: an outer sleeve; The hydraulic rod is inserted inside the outer sleeve, the bottom surface of the outer sleeve is sealed, the top surface of the outer sleeve is open, and the top end of the hydraulic rod extends out from the opening on the top surface of the outer sleeve; The outer wall of the hydraulic rod is provided with a ring, and the top surface of the ring is provided with an annular lifting plate; The outer wall of the ring is in contact with the inner wall of the outer sleeve, and the outer wall of the lifting plate is in contact with the inner wall of the outer sleeve.

[0008] In one optional embodiment, the clamping ring is disposed at the top of the outer sleeve, and the top surface of the outer sleeve is provided with an annular guide groove; The top surface of the clamping ring is provided with an extension block, and the bottom surface of the extension block is provided with a guide ring adapted to the guide groove, and the guide ring is inserted into the guide groove; The outer wall of the clamping ring is in close contact with the inner wall of the outer sleeve; The inner wall of the clamping ring is inclined, and the part of the clamping ring that extends into the outer sleeve becomes thinner; The thickest part of the clamping ring is always in close contact with the outer wall of the hydraulic rod.

[0009] In one optional embodiment, the inner wall of the outer sleeve is provided with an annular notch, the annular notch is covered by a clamping ring, a block is provided on the outer wall of the outer sleeve, an oil storage tank is provided in the block, the oil storage tank communicates with the annular notch, and the annular notch and the oil storage tank are filled with oil. The outer wall of the clamping ring is provided with a stepped surface, which is located above the annular notch.

[0010] In one alternative embodiment, as the hydraulic rod moves upward, increasing the length of the hydraulic rod extending beyond the outer sleeve, the lifting plate contacts the bottom of the clamping plate. As the extension length of the hydraulic rod continues to increase, the lifting plate inserts between the clamping ring and the inner wall of the outer sleeve, causing the bottom of the clamping ring to move closer to and adhere tightly to the hydraulic rod, thereby increasing the length of the clamping ring adhering to the hydraulic rod and reducing the lateral load on the hydraulic rod.

[0011] In one alternative embodiment, after the lifting plate is inserted between the clamping ring and the inner wall of the outer sleeve, as the hydraulic rod continues to rise, the lifting plate rises accordingly and contacts the step surface. Then, as the lifting plate continues to rise, it lifts the clamping ring, so that while the clamping ring is holding the hydraulic rod, it moves out of the outer sleeve with the hydraulic rod, thereby reducing the lateral load on the hydraulic rod.

[0012] In one alternative embodiment, as the lifting plate is inserted between the clamping ring and the inner wall of the outer sleeve and moves toward the stepped surface, the lifting plate squeezes the space of the annular notch, forcing the oil into the gap between the clamping ring and the inner sleeve above the stepped surface.

[0013] In one optional embodiment, an oil cavity exists between the bottom of the hydraulic rod and the inner bottom surface of the outer sleeve, and an oil port is provided on the outer wall of the outer sleeve, the oil port communicating with the oil cavity; When hydraulic oil is introduced into the oil chamber through the oil port, the hydraulic rod moves upward.

[0014] In one alternative implementation, the bottom of the outer sleeve is connected to the vehicle frame.

[0015] Secondly, this disclosure also provides a method for operating the saddle lifting system for a tractor described above, comprising: When the hydraulic rod of the cylinder assembly rises, it causes the lifting frame to tilt upwards, thereby increasing the height of the saddle. The clamping ring on the outer sleeve of the hydraulic rod moves according to the distance the hydraulic rod rises, so as to reduce the lateral load on the hydraulic rod.

[0016] The beneficial effect of this invention is that the saddle lifting system for tractor vehicles uses the hydraulic rod of the cylinder assembly to drive the lifting frame to tilt upwards during the lifting process, thereby increasing the height of the saddle. Furthermore, the clamping ring fitted around the hydraulic rod moves according to the distance the hydraulic rod rises, thereby reducing the lateral load on the hydraulic rod and preventing stress deformation damage to the hydraulic rod.

[0017] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained through the structures particularly pointed out in the description and the drawings.

[0018] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 A schematic diagram of a saddle lifting system for a tractor provided in an embodiment of this disclosure; Figure 2 This is a schematic diagram of the structure of a hydraulic cylinder assembly provided in an embodiment of the present disclosure; Figure 3 This is a cross-sectional view of a hydraulic cylinder assembly provided in an embodiment of this disclosure.

[0021] In the picture: Drive mechanism 1, cylinder assembly 11, outer sleeve 111, guide groove 112, annular notch 113, hydraulic rod 121, ring body 122, lifting plate 123, pressure plate 124, clamping ring 131, extension block 132, guide ring 133, stepped surface 134, block body 141, oil reservoir 142, oil cavity 151, oil port 161; 2. Saddle mechanism; 21. Lifting frame; 22. Saddle. Frame 3. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0024] As an important piece of equipment in port transportation, the tractor unit is equipped with a saddle to connect with the trailer. To improve the compatibility of the trailer connection, related technologies often equip the saddle with a hydraulic system for lifting. The height of the saddle is adjusted by extending and retracting the hydraulic rod. However, the above-mentioned setup still has some problems. Since the trailer and the tractor unit are connected through the saddle and the towing hook, they cannot be completely fixed together, and there will be a certain amount of play. This will cause the trailer to have a certain lag when braking and starting, resulting in instantaneous impact and causing lateral load on the extended hydraulic rod. Over time, this will lead to stress deformation and damage to the hydraulic rod.

[0025] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0026] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0027] like Figure 1 and Figure 2 As shown, at least one disclosed embodiment provides a saddle lifting system for a tractor unit, including: a drive mechanism 1, and a saddle mechanism 2 connected to the drive mechanism 1. The drive mechanism 1 is configured to drive the saddle mechanism 2 to rise and fall, so that the height of the saddle 22 within the saddle mechanism 2 is adapted to the towing hook. The drive mechanism 1 includes: at least one pair of hydraulic cylinder assemblies 11; the top end of the hydraulic rod 121 of the hydraulic cylinder assembly 11 is hinged to a lifting frame 21 within the saddle mechanism 2; the lifting frame 21 is rotatably connected to the vehicle frame 3; the saddle 22 is connected to the lifting frame 21; when the hydraulic rod 121 of the hydraulic cylinder assembly 11 rises, it causes the lifting frame 21 to tilt upward, thereby increasing the height of the saddle 22, and a clamping ring 131 sleeved on the hydraulic rod 121 moves according to the distance the hydraulic rod 121 rises, so as to reduce the lateral load on the hydraulic rod 121 and avoid stress deformation damage to the hydraulic rod 121.

[0028] In this embodiment, when the hydraulic rod 121 moves upward, the contact area between the clamping ring 131 and the hydraulic rod 121 increases, allowing the clamping ring 131 to better grip the hydraulic rod 121 and reduce the lateral load on the hydraulic rod 121. When the extension length of the hydraulic rod 121 increases, the clamping ring 131 can move with the hydraulic rod 121 to avoid an increase in lateral load when the hydraulic rod 121 extends too far.

[0029] In this embodiment, when there are multiple hydraulic cylinder assemblies 11, the hydraulic rods 121 of the multiple hydraulic cylinder assemblies 11 work synchronously, so that the saddle mechanism 2 can be raised or lowered stably.

[0030] In this embodiment, the saddle mechanism 2 includes: a lifting frame 21; the lifting frame 21 is connected to the frame 3 via a through shaft; the top end of the hydraulic rod 121 is hinged to the lifting frame 21 via a pin; and the bottom of the outer sleeve 111 is connected to the frame 3 via another pin.

[0031] like Figure 2 and Figure 3As shown, in one optional embodiment, the cylinder assembly 11 includes: an outer sleeve 111; a hydraulic rod 121 passing through the outer sleeve 111, the bottom surface of the outer sleeve 111 being sealed, the top surface of the outer sleeve 111 being open, and the top end of the hydraulic rod 121 extending from the open end of the top surface of the outer sleeve 111; an annular body 122 being provided on the outer wall of the hydraulic rod 121, and an annular lifting plate 123 being provided on the top surface of the annular body 122; the outer wall of the annular body 122 contacting the inner wall of the outer sleeve 111, and the outer wall of the lifting plate 123 contacting the inner wall of the outer sleeve 111.

[0032] In this embodiment, when the hydraulic rod 121 moves, it causes the ring body 122 and the lifting plate 123 to move together.

[0033] In this embodiment, the clamping ring 131 is made of an elastic material.

[0034] like Figure 3 As shown, in one optional embodiment, the clamping ring 131 is disposed at the top of the outer sleeve 111, and the top surface of the outer sleeve 111 is provided with an annular guide groove 112; the top surface of the clamping ring 131 is provided with an extension block 132, and the bottom surface of the extension block 132 is provided with a guide ring 133 adapted to the guide groove 112, the guide ring 133 being inserted into the guide groove 112; the outer wall of the clamping ring 131 is in close contact with the inner wall of the outer sleeve 111; the inner wall of the clamping ring 131 is inclined, and the portion of the clamping ring 131 that extends into the outer sleeve 111 becomes thinner; the thickest part of the clamping ring 131 is always in close contact with the outer wall of the hydraulic rod 121.

[0035] In this embodiment, when the clamping ring 131 needs to move, the clamping ring 131 can move stably through the cooperation of the guide groove 112 and the guide ring 133.

[0036] In this embodiment, in the initial state, the hydraulic rod 121 is at its shortest length extending out of the outer sleeve 111. The thicker inner wall of the clamping ring 131 contacts the outer wall of the hydraulic rod 121 to stably hold the hydraulic rod 121. At this time, the clamping ring 131 is squeezed by the hydraulic rod 121, so that the outer wall of the clamping ring 131 can be tightly attached to the inner wall of the outer sleeve 111, so that the clamping ring 131 can seal and block the annular notch 113 to prevent oil leakage.

[0037] like Figure 3As shown, in one optional embodiment, the inner wall of the outer sleeve 111 is provided with an annular notch 113, which is covered by a clamping ring 131. A block 141 is provided on the outer wall of the outer sleeve 111, and an oil storage groove 142 is formed inside the block 141. The oil storage groove 142 communicates with the annular notch 113, and the annular notch 113 and the oil storage groove 142 are filled with oil. The outer wall of the clamping ring 131 is provided with a stepped surface 134, which is located above the annular notch 113.

[0038] In this embodiment, a through hole may be provided on the side wall of the outer sleeve 111 so that the oil storage tank 142 is connected to the annular notch 113.

[0039] In this embodiment, when hydraulic oil is injected into the oil chamber 151 through the oil port 161, the hydraulic rod 121 drives the ring body 122 to move synchronously. The hydraulic rod 121 begins to rise. When the lifting plate 123 is inserted between the clamping ring 131 and the inner wall of the outer sleeve 111, the part of the clamping ring 131 that was not in contact with the hydraulic rod 121 because the inner wall of the clamping ring 131 is inclined, comes into contact with the hydraulic rod 121 due to the compression of the lifting plate 123. As the length of the hydraulic rod 121 extending out of the outer sleeve 111 increases, the length and area of ​​contact between the clamping ring 131 and the hydraulic rod 121 also increase. The clamping ring 131 can better hold the hydraulic rod 121, reducing the lateral load on the hydraulic rod 121.

[0040] In one alternative embodiment, as the hydraulic rod 121 moves upward, increasing the length of the hydraulic rod 121 extending beyond the outer sleeve 111, the lifting plate 123 contacts the bottom of the clamping plate. As the extension length of the hydraulic rod 121 continues to increase, the lifting plate 123 inserts between the clamping ring 131 and the inner wall of the outer sleeve 111, causing the bottom of the clamping ring 131 to approach and adhere tightly to the hydraulic rod 121, thereby increasing the length of the clamping ring 131 adhering to the hydraulic rod 121 and reducing the lateral load on the hydraulic rod 121.

[0041] In one alternative embodiment, after the lifting plate 123 is inserted between the clamping ring 131 and the inner wall of the outer sleeve 111, as the hydraulic rod 121 continues to rise, the lifting plate 123 rises accordingly and contacts the step surface 134. Then, as the lifting plate 123 continues to rise, it lifts the clamping ring 131, so that while clamping the hydraulic rod 121, the clamping ring 131 moves out of the outer sleeve 111 with the hydraulic rod 121, thereby reducing the lateral load on the hydraulic rod 121.

[0042] In one alternative embodiment, when the lifting plate 123 is inserted between the clamping ring 131 and the inner wall of the outer sleeve 111 and moves toward the stepped surface 134, the lifting plate 123 squeezes the space of the annular notch 113, squeezing the oil into the gap between the clamping ring 131 and the inner sleeve above the stepped surface 134.

[0043] In this embodiment, as the length of the hydraulic rod 121 extending out of the outer sleeve 111 continues to increase, the lifting plate 123 inserts between the clamping ring 131 and the inner wall of the outer sleeve 111 and continues to rise, contacting the step surface 134. At this time, as the hydraulic rod 121 continues to rise, the lifting plate 123 passes through the step surface 134, causing the entire clamping ring 131 to begin to rise, thus preventing the length of the hydraulic rod 121 extending out of the clamping ring 131 from continuing to increase and reducing the lateral load on the hydraulic rod 121.

[0044] In this embodiment, when the lifting plate 123 is inserted between the clamping ring 131 and the inner wall of the outer sleeve 111, the outer wall of the lifting plate 123 contacts the inner wall of the outer sleeve 111, and the inner wall of the lifting plate 123 contacts the outer wall of the clamping ring 131. This keeps the annular notch 113 covered and sealed, preventing oil leakage. Furthermore, since the lifting plate 123 is inserted into the annular notch 113, the space of the annular notch 113 is reduced. After being squeezed, the oil enters upward into the gap between the clamping ring 131 and the inner sleeve above the step surface 134. This allows the oil to fill the gap after the clamping ring 131 moves, assisting the clamping ring 131 in holding the hydraulic rod 121.

[0045] In one optional embodiment, an oil cavity 151 exists between the bottom of the hydraulic rod 121 and the inner bottom surface of the outer sleeve 111. An oil port 161 is provided on the outer wall of the outer sleeve 111, and the oil port 161 communicates with the oil cavity 151. When hydraulic oil is introduced into the oil cavity 151 through the oil port 161, the hydraulic rod 121 moves upward.

[0046] In one alternative embodiment, the bottom of the outer sleeve 111 is connected to the frame 3.

[0047] In this embodiment, hydraulic oil can be injected into the oil chamber 151 through the oil port 161, or the hydraulic oil in the oil chamber 151 can be discharged through the oil port 161. After the hydraulic oil in the oil chamber 151 is discharged, the hydraulic rod 121 is reset.

[0048] In this embodiment, the outer wall of the guide ring 133 is in close contact with the inner wall of the guide groove 112, and the friction between the guide ring 133 and the guide groove 112 is greater than the friction between the clamping ring 131 and the hydraulic rod 121, so that the hydraulic rod 121 will not drive the clamping ring 131 to move when it extends.

[0049] In this embodiment, a plurality of pressure plates 124 are provided on the outer wall of the hydraulic rod 121 near the top end. The pressure plates 124 are always located above the top surface of the outer sleeve 111 so that the clamping ring 131 can be pressed down and reset when the hydraulic rod 121 is reset.

[0050] At least one other disclosed embodiment also provides a method of operation using the above-described saddle lifting system for a tractor, comprising: the hydraulic rod 121 of the cylinder assembly 11 lifting the lifting frame 21 upward during lifting, thereby increasing the height of the saddle 22, and a clamping ring 131 fitted over the hydraulic rod 121 moving according to the distance the hydraulic rod 121 rises, so as to reduce the lateral load on the hydraulic rod 121.

[0051] In summary, the saddle lifting system for the tractor unit uses the hydraulic rod 121 of the cylinder assembly 11 to lift the lifting frame 21 upwards during the lifting process, thereby increasing the height of the saddle 22. Furthermore, the clamping ring 131 surrounding the hydraulic rod 121 moves according to the distance the hydraulic rod 121 rises, thereby reducing the lateral load on the hydraulic rod 121 and preventing stress deformation damage to the hydraulic rod 121.

[0052] In the description of the embodiments of the present invention, 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, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0053] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention 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, and therefore should not be construed as a limitation of the invention. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as a second element, component, region, layer, or segment.

[0054] Spatially relative terms, such as “inside,” “outside,” “below,” “below,” “down,” “above,” “up,” etc., may be used herein to describe the relationship between one element or feature illustrated in the figures and another element or feature. In addition to the orientations depicted in the figures, spatially relative terms may be intended to cover different orientations of the device in use or operation. For example, if the device in the figure is flipped, an element described as “below” or “below” other elements or features would be oriented as “above” other elements or features. Thus, the example term “below” can cover both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.

[0055] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A saddle lifting system for a tractor unit, characterized in that, include: A drive mechanism (1) and a saddle mechanism (2) connected to the drive mechanism (1), the drive mechanism (1) being configured to drive the saddle mechanism (2) to rise and fall so that the height of the saddle (22) inside the saddle mechanism (2) is adapted to the traction hook; The drive mechanism (1) includes: at least one pair of hydraulic cylinder assemblies (11); The top end of the hydraulic rod (121) of the cylinder assembly (11) is hinged to the lifting frame (21) inside the saddle mechanism (2); The lifting frame (21) is rotatably connected to the vehicle frame (3); The saddle (22) is connected to the lifting frame (21); When the hydraulic rod (121) of the cylinder assembly (11) rises, it causes the lifting frame (21) to tilt upward, thereby increasing the height of the saddle (22). The clamping ring (131) on the outer sleeve of the hydraulic rod (121) moves according to the distance the hydraulic rod (121) rises, so as to reduce the lateral load on the hydraulic rod (121).

2. The saddle lifting system for a tractor as described in claim 1, characterized in that: The cylinder assembly (11) includes: an outer sleeve (111); The hydraulic rod (121) is inserted inside the outer sleeve (111). The bottom surface of the outer sleeve (111) is sealed, and the top surface of the outer sleeve (111) is open. The top end of the hydraulic rod (121) extends out from the open surface of the top surface of the outer sleeve (111). The outer wall of the hydraulic rod (121) is provided with a ring (122), and the top surface of the ring (122) is provided with an annular lifting plate (123). The outer wall of the ring (122) is in contact with the inner wall of the outer sleeve (111), and the outer wall of the lifting plate (123) is in contact with the inner wall of the outer sleeve (111).

3. The saddle lifting system for a tractor as described in claim 2, characterized in that: The clamping ring (131) is disposed on the top of the outer sleeve (111), and the top surface of the outer sleeve (111) is provided with an annular guide groove (112). The top surface of the clamping ring (131) is provided with an extension block (132), and the bottom surface of the extension block (132) is provided with a guide ring (133) adapted to the guide groove (112). The guide ring (133) is inserted into the guide groove (112). The outer wall of the clamping ring (131) is in close contact with the inner wall of the outer sleeve (111); The inner wall of the clamping ring (131) is inclined, and the part of the clamping ring (131) that extends into the outer sleeve (111) becomes thinner; The thickest part of the clamping ring (131) is always in close contact with the outer wall of the hydraulic rod (121).

4. The saddle lifting system for a tractor as described in claim 3, characterized in that: The inner wall of the outer sleeve (111) is provided with an annular notch (113), the annular notch (113) is covered by a clamping ring (131), and a block (141) is provided on the outer wall of the outer sleeve (111). An oil storage tank (142) is provided in the block (141), the oil storage tank (142) is connected to the annular notch (113), and the annular notch (113) and the oil storage tank (142) are filled with oil. The outer wall of the clamping ring (131) is provided with a stepped surface (134), which is located above the annular notch (113).

5. The saddle lifting system for a tractor as described in claim 4, characterized in that: As the hydraulic rod (121) moves upward, increasing the length of the hydraulic rod (121) extending beyond the outer sleeve (111), the lifting plate (123) contacts the bottom of the clamping plate. As the extension length of the hydraulic rod (121) continues to increase, the lifting plate (123) inserts between the clamping ring (131) and the inner wall of the outer sleeve (111), causing the bottom of the clamping ring (131) to move closer to and adhere tightly to the hydraulic rod (121), thereby increasing the length of the clamping ring (131) adhering to the hydraulic rod (121) and reducing the lateral load on the hydraulic rod (121).

6. The saddle lifting system for a tractor as described in claim 5, characterized in that: After the lifting plate (123) is inserted between the clamping ring (131) and the inner wall of the outer sleeve (111), as the hydraulic rod (121) continues to rise, the lifting plate (123) rises accordingly and contacts the step surface (134). Then, as the lifting plate (123) continues to rise, it lifts up the clamping ring (131), so that while the clamping ring (131) is holding the hydraulic rod (121), it moves out of the outer sleeve (111) with the hydraulic rod (121), reducing the lateral load on the hydraulic rod (121).

7. The saddle lifting system for a tractor as described in claim 6, characterized in that: When the lifting plate (123) is inserted between the clamping ring (131) and the inner wall of the outer sleeve (111) and moves toward the step surface (134), the lifting plate (123) squeezes the space of the annular notch (113) and squeezes the oil into the gap between the clamping ring (131) and the inner sleeve above the step surface (134).

8. The saddle lifting system for a tractor as described in claim 2, characterized in that: There is an oil cavity (151) between the bottom of the hydraulic rod (121) and the inner bottom surface of the outer sleeve (111). An oil port (161) is provided on the outer wall of the outer sleeve (111), and the oil port (161) is connected to the oil cavity (151). When hydraulic oil is introduced into the oil chamber (151) through the oil port (161), the hydraulic rod (121) moves upward.

9. The saddle lifting system for a tractor as described in claim 8, characterized in that: The bottom of the outer sleeve (111) is connected to the frame (3).

10. A method of operating the saddle lifting system for a tractor as described in claim 1, characterized in that, include: When the hydraulic rod (121) of the cylinder assembly (11) rises, it causes the lifting frame (21) to tilt upward, thereby increasing the height of the saddle (22). The clamping ring (131) on the outer sleeve of the hydraulic rod (121) moves according to the distance the hydraulic rod (121) rises, so as to reduce the lateral load on the hydraulic rod (121).

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