Saddle adjustment system and semitrailer

Abstract

The utility model relates to the technical field of vehicle, specifically disclose saddle adjusting system and semitrailer tractor, this saddle adjusting system includes saddle subassembly, drive subassembly and locking subassembly, saddle subassembly includes base and along the saddle of sliding fit of first horizontal direction with base, base is fixed with the frame of tractor, and saddle connects semitrailer, drive subassembly includes first two -way air cylinder, and the first fixed department of first two -way air cylinder is fixedly connected with base, and the first telescopic part of first two -way air cylinder is fixedly connected with saddle, and the telescopic direction of first telescopic part sets up along first horizontal direction, and the gas supply of tractor supplies gas to first two -way air cylinder, locking subassembly has first state and second state, in first state, the relative fixation of saddle and base, in second state, saddle and base sliding fit. The gas supply of tractor supplies gas to first two -way air cylinder, and then make first two -way air cylinder drive saddle move to the direction of far away or far away tractor, to realize the interval adjustment between tractor and semitrailer.

Description

Technical Field

[0001] This utility model relates to the field of vehicle technology, and in particular to a saddle adjustment system and a semi-trailer tractor. Background Technology

[0002] Semi-trailer tractors, as the mainstay of modern road freight, occupy an irreplaceable position in the global logistics system. Through the articulated design of "tractor + semi-trailer," the effective load can reach 30-50 tons (Chinese regulations limit 49 tons), and the volume utilization rate is 20%-30% higher than that of rigid trucks. Supporting swap-and-hook transport modes, the tractor can quickly switch to semi-trailers with different functions (such as refrigerated / container / flatbed trailers), significantly reducing loading and unloading waiting time.

[0003] Currently, the distance between the tractor and the semi-trailer is usually a fixed value. This distance significantly impacts the performance of the semi-trailer during operation. While a large distance facilitates turning, it reduces wind resistance, leading to increased fuel consumption. Conversely, a small distance effectively reduces wind resistance but hinders steering.

[0004] Therefore, a saddle adjustment system is urgently needed to solve the above problems. Utility Model Content

[0005] The purpose of this utility model is to provide a saddle adjustment system and a semi-trailer tractor to solve the problem that the distance between the tractor and the semi-trailer cannot be actively adjusted in related technologies.

[0006] On the one hand, this utility model provides a saddle adjustment system, which includes:

[0007] A saddle assembly includes a base and a saddle that slides in a first horizontal direction with the base, the base being used to fix to the frame of a tractor unit, and the saddle being used to connect to a semi-trailer.

[0008] The drive assembly includes a first bidirectional cylinder, a first fixed part of the first bidirectional cylinder is fixedly connected to the base, a first telescopic part of the first bidirectional cylinder is fixedly connected to the saddle, the telescopic direction of the first telescopic part is set along the first horizontal direction, and the air source of the tractor is used to supply air to the first bidirectional cylinder.

[0009] The locking assembly has a first state and a second state. In the first state, the saddle and the base are relatively fixed, and in the second state, the saddle and the base are slidably engaged.

[0010] As a preferred technical solution for the saddle adjustment system, the first bidirectional cylinder includes a first piston chamber and a second piston chamber. Air enters the first piston chamber to cause the first telescopic part to extend out of the first fixed part, and air enters the second piston chamber to cause the first telescopic part to retract into the first fixed part.

[0011] The drive assembly further includes a first switching valve and a second switching valve. The first switching valve is used to control the air source of the tractor to communicate with the first piston chamber, or to control the first piston chamber to communicate with the atmosphere.

[0012] The second switching valve is used to control the air source of the tractor to communicate with the second piston chamber, or to control the second piston chamber to communicate with the atmosphere.

[0013] As a preferred technical solution for the saddle adjustment system, the base is provided with a sliding hole, which extends along the first horizontal direction;

[0014] The first bidirectional cylinder and the saddle are respectively disposed on both sides of the base, and the first fixing part is fixedly connected to the base;

[0015] The drive assembly further includes a lever, which is inserted into the sliding hole and slides within the sliding hole along the first horizontal direction. One end of the lever is fixedly connected to the saddle, and the other end of the lever is fixedly connected to the first telescopic part.

[0016] As a preferred technical solution for the saddle adjustment system, the saddle assembly further includes a slide rail, which is fixed to the base and extends along the first horizontal direction. The saddle is provided with a slide groove, and the slide rail is slidably disposed within the slide groove.

[0017] As a preferred technical solution for the saddle adjustment system, the slide rail is a T-shaped slide rail and the slide groove is a T-shaped slide groove.

[0018] As a preferred technical solution for the saddle adjustment system, at least two slide rails are provided, and the at least two slide rails are spaced apart along the second horizontal direction. At least two slide grooves are provided, and the at least two slide grooves correspond one-to-one with the at least two slide rails. The first horizontal direction is perpendicular to the second horizontal direction.

[0019] As a preferred technical solution for the saddle adjustment system, the saddle includes a body and two support frames. The two support frames are arranged on both sides of the body along a second horizontal direction, and the two support frames are slidably engaged with the base along a first horizontal direction.

[0020] The locking assembly includes a limiting strip and a second bidirectional cylinder. The limiting strip is disposed between the two support frames along the second horizontal direction and extends along the first horizontal direction. The surface of the limiting strip opposite to the body is recessed with a plurality of limiting pin holes at intervals along the first horizontal direction. The second fixing part of the second bidirectional cylinder is fixed to the body so that the second telescopic part of the second bidirectional cylinder is located above the sliding trajectory of the plurality of limiting pin holes. In the first state, the second telescopic part is inserted into the corresponding limiting pin hole. In the second state, the second telescopic part is spaced apart from the limiting strip.

[0021] As a preferred technical solution for the saddle adjustment system, the locking assembly further includes a limiting sleeve, which is located between the body and the limiting strip. The limiting sleeve is sleeved on the second telescopic part and slides with the second telescopic part, and the limiting sleeve is fixedly connected to the body.

[0022] As a preferred technical solution for the saddle adjustment system, a rangefinder is also included, which is used to monitor the distance between the tractor and the semi-trailer.

[0023] On the other hand, the present invention provides a semi-trailer tractor, including the tractor, the semi-trailer, and a saddle adjustment system as described in any of the above embodiments, wherein the base is fixed to the frame of the tractor, and the saddle is used to connect the semi-trailer.

[0024] The beneficial effects of this utility model are as follows:

[0025] This utility model provides a saddle adjustment system and a semi-trailer tractor. The saddle adjustment system includes a saddle assembly, a drive assembly, and a locking assembly. The saddle assembly includes a base and a saddle that slides along a first horizontal direction with the base. The base is used to fix the tractor's frame, and the saddle is used to connect the semi-trailer. The drive assembly includes a first bidirectional cylinder. The first fixed part of the first bidirectional cylinder is fixedly connected to the base, and the first telescopic part of the first bidirectional cylinder is fixedly connected to the saddle. The telescopic direction of the first telescopic part is set along the first horizontal direction, and the air source of the tractor is used to supply air to the first bidirectional cylinder. The locking assembly has a first state and a second state. In the first state, the saddle and the base are relatively fixed, and in the second state, the saddle and the base slide together. When a semi-trailer tractor equipped with the saddle adjustment system needs to turn, the locking assembly is in the second state, and the air source of the tractor supplies air to the first double-acting cylinder, which in turn drives the saddle to move away from the tractor, thereby increasing the distance between the tractor and the semi-trailer, which is beneficial for the semi-trailer to turn at a large angle. After adjusting the distance between the tractor and the semi-trailer, the locking assembly is adjusted to the first state, and the semi-trailer can then turn.

[0026] When the vehicle is traveling at high speed and does not require large-angle steering, the locking assembly is in its second state. The tractor's air supply then supplies air to the first dual-acting cylinder, causing it to drive the saddle closer to the tractor. This reduces the distance between the tractor and the semi-trailer, thus reducing wind resistance and fuel consumption. After adjusting the distance between the tractor and the semi-trailer, the locking assembly is switched to its first state, allowing the semi-trailer to travel at high speed. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the tractor semi-trailer in the embodiments of this utility model;

[0028] Figure 2 This is a schematic diagram of the saddle adjustment system in an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the structure of the second bidirectional cylinder and the limiting sleeve in the embodiment of this utility model.

[0030] In the picture:

[0031] X, first horizontal direction; Y, second horizontal direction;

[0032] 100. Tractor; 200. Semi-trailer;

[0033] 1. Saddle assembly; 11. Base; 111. Sliding hole; 12. Saddle; 121. Body; 122. Support frame; 1221. Slide groove; 13. Slide rail;

[0034] 21. First bidirectional cylinder; 211. First fixed part; 212. First telescopic part; 22. First switching valve; 23. Second switching valve; 24. Lever;

[0035] 31. Limiting strip; 311. Limiting pin hole; 32. Second bidirectional cylinder; 321. Second telescopic part; 322. Second fixing part; 33. Limiting sleeve;

[0036] 4. Rangefinder. Detailed Implementation

[0037] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0038] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Moreover, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0039] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 this utility model based on the specific circumstances.

[0040] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0041] like Figures 1-3As shown, this embodiment provides a saddle adjustment system, which includes a saddle assembly 1, a drive assembly, and a locking assembly. The saddle assembly 1 includes a base 11 and a saddle 12 that slides with the base 11 along a first horizontal direction X. The base 11 is used to fix the tractor 100 to the frame, and the saddle 12 is used to connect the semi-trailer 200. The drive assembly includes a first bidirectional cylinder 21. The first fixed part 211 of the first bidirectional cylinder 21 is fixedly connected to the base 11, and the first telescopic part 212 of the first bidirectional cylinder 21 is fixedly connected to the saddle 12. The telescopic direction of the first telescopic part 212 is set along the first horizontal direction X. The air source of the tractor 100 is used to supply air to the first bidirectional cylinder 21. The locking assembly has a first state and a second state. In the first state, the saddle 12 and the base 11 are relatively fixed, and in the second state, the saddle 12 and the base 11 slide with each other. When the semi-trailer tractor 100 equipped with the saddle adjustment system needs to turn, the locking assembly is in the second state, and the air source of the tractor 100 supplies air to the first bidirectional cylinder 21, thereby causing the first bidirectional cylinder 21 to drive the saddle 12 to move away from the tractor 100, so as to increase the distance between the tractor 100 and the semi-trailer 200, which is conducive to the large-angle turning of the semi-trailer tractor 100. After adjusting the distance between the tractor 100 and the semi-trailer 200, the locking assembly is adjusted to the first state, and the semi-trailer 200 can then turn.

[0042] When the vehicle is traveling at high speed and does not require large-angle steering, the locking assembly is in the second state. The air supply from the tractor 100 supplies air to the first dual-acting cylinder 21, which in turn drives the saddle 12 to move closer to the tractor 100. This reduces the distance between the tractor 100 and the semi-trailer 200, thereby reducing the wind resistance of the semi-trailer tractor 100 and reducing fuel consumption. After adjusting the distance between the tractor 100 and the semi-trailer 200, the locking assembly is adjusted to the first state, allowing the semi-trailer 200 to travel at high speed.

[0043] Optionally, the first bidirectional cylinder 21 includes a first piston chamber and a second piston chamber. Air enters the first piston chamber to extend the first telescopic part 212 out of the first fixed part 211, and air enters the second piston chamber to retract the first telescopic part 212 back into the first fixed part 211. The drive assembly also includes a first switching valve 22 and a second switching valve 23. The first switching valve 22 is used to control the air source of the tractor 100 to connect with the first piston chamber, or to control the first piston chamber to connect with the atmosphere. The second switching valve 23 is used to control the air source of the tractor 100 to connect with the second piston chamber, or to control the second piston chamber to connect with the atmosphere. In this embodiment, the first switching valve 22 is a two-position three-way solenoid valve. When the first switching valve 22 is in the first position, the first switching valve 22 connects the first piston chamber and the air source of the tractor 100. When the first switching valve 22 is in the second position, the first switching valve 22 connects the first piston chamber to the atmosphere. At this time, the air source of the tractor 100 connected to the first switching valve 22 is closed. The second switching valve 23 is a two-position three-way solenoid valve. When the second switching valve 23 is in the first position, it connects the second piston chamber to the air source of the tractor 100. When the second switching valve 23 is in the second position, it connects the second piston chamber to the atmosphere. At this time, the air source of the tractor 100 connected to the second switching valve 23 is closed.

[0044] Optionally, the base 11 is provided with a sliding hole 111, which extends along the first horizontal direction X; the first bidirectional cylinder 21 and the saddle 12 are respectively disposed on both sides of the base 11, and the first fixing part 211 is fixedly connected to the base 11; the drive assembly also includes a lever 24, which is inserted into the sliding hole 111 and slides within the sliding hole 111 along the first horizontal direction X. One end of the lever 24 is fixedly connected to the saddle 12, and the other end of the lever 24 is fixedly connected to the first telescopic part 212. In this embodiment, the first bidirectional cylinder 21 and the saddle 12 are respectively disposed on both sides of the base 11, thereby preventing the semi-trailer 200 from bumping into the first bidirectional cylinder 21. The extension and retraction of the first telescopic part 212 of the first bidirectional cylinder 21 drives the lever 24 to move relative to the base 11 along the first horizontal direction X within the sliding hole 111, thereby driving the saddle 12 to slide relative to the base 11 along the first horizontal direction X.

[0045] Optionally, the saddle assembly 1 further includes a slide rail 13, which is fixed to the base 11 and extends along the first horizontal direction X. The saddle 12 is provided with a groove 1221, and the slide rail 13 is slidably disposed within the groove 1221. In this embodiment, the slide rail 13 is slidably disposed within the groove 1221 so that the saddle 12 can only slide along the extending direction of the slide rail 13.

[0046] Optionally, the slide rail 13 is a T-shaped slide rail 13, and the slide groove 1221 is a T-shaped slide groove 1221. In this embodiment, this arrangement ensures that the saddle 12 can only slide along the extension direction of the slide rail 13.

[0047] Optionally, at least two slide rails 13 are provided, and the at least two slide rails 13 are spaced apart along the second horizontal direction Y. At least two slide grooves 1221 are provided, and the at least two slide grooves 1221 correspond one-to-one with the at least two slide rails 13. The first horizontal direction X and the second horizontal direction Y are perpendicular. In this embodiment, this arrangement can improve the stability of the saddle 12 sliding relative to the base 11 and prevent jamming between the saddle 12 and the base 11 when the saddle 12 slides relative to the base 11.

[0048] Specifically, there are two slide rails 13 and two slide grooves 1221.

[0049] Optionally, there are two first bidirectional hydraulic cylinders 21 and two levers 24, with one-to-one correspondence between the two first bidirectional hydraulic cylinders 21 and the two levers 24. The first bidirectional hydraulic cylinders 21 are spaced apart along the second horizontal direction Y. The first switching valve 22 is used to control the air source of the tractor 100 to be synchronously connected to the first piston chamber of the two first bidirectional hydraulic cylinders 21, or to synchronously control the first piston chamber of the two first bidirectional hydraulic cylinders 21 to be connected to the atmosphere. The second switching valve 23 is used to control the air source of the tractor 100 to be synchronously connected to the second piston chamber of the two first bidirectional hydraulic cylinders 21, or to synchronously control the second piston chamber of the two first bidirectional hydraulic cylinders 21 to be connected to the atmosphere.

[0050] Optionally, the saddle 12 includes a body 121 and two support frames 122. The two support frames 122 are disposed on both sides of the body 121 along the second horizontal direction Y. The two support frames 122 and the base 11 are slidably engaged along the first horizontal direction X. The locking assembly includes a limiting strip 31 and a second bidirectional cylinder 32. The limiting strip 31 is disposed between the two support frames 122 along the second horizontal direction Y and extends along the first horizontal direction X. The surface of the limiting strip 31 opposite to the body 121 is recessed with a plurality of limiting pin holes 311 at intervals along the first horizontal direction X. The second fixing part 322 of the second bidirectional cylinder 32 is fixed to the body 121 so that the second telescopic part 321 of the second bidirectional cylinder 32 is located above the sliding trajectory of the plurality of limiting pin holes 311. In the first state, the second telescopic part 321 is inserted into the corresponding limiting pin hole 311. In the second state, the second telescopic part 321 and the limiting strip 31 are spaced apart. In this embodiment, two sliding grooves 1221 are respectively set on two support frames 122. When the first telescopic part 212 drives the saddle 12 to move relative to the base 11, the second telescopic part 321 slides through multiple limiting pin holes 311 in sequence. After the distance between the tractor 100 and the semi-trailer 200 is determined, the second telescopic part 321 is inserted into the corresponding limiting pin hole 311 to achieve relative fixation of the saddle 12 and the base 11.

[0051] Specifically, the air source for the tractor 100 is the second bidirectional cylinder 32.

[0052] When the semi-trailer tractor 100 starts, there is a significant impact force between the second telescopic part 321 and the limiting strip 31, which can damage the second fixing part 322 and affect the service life of the second double-acting cylinder 32. To solve this problem, the locking assembly may optionally include a limiting sleeve 33. The limiting sleeve 33 is located between the body 121 and the limiting strip 31. The limiting sleeve 33 is sleeved on the second telescopic part 321 and slides with it. The limiting sleeve 33 is fixedly connected to the body 121. In this embodiment, the limiting sleeve 33 is fixed on the body 121. When the semi-trailer tractor 100 starts, the second telescopic part 321 directly impacts the limiting sleeve 33 and the limiting strip 31. The limiting sleeve 33 bears part of the impact force for the second fixing part 322, thereby improving the service life of the second double-acting cylinder 32.

[0053] Optionally, the saddle adjustment system also includes a rangefinder 4, which is used to monitor the distance between the tractor 100 and the semi-trailer 200. In this embodiment, this setup can measure the distance between the tractor 100 and the semi-trailer 200 in real time, thereby providing a basis for the driver to control the saddle adjustment system. Specifically, the rangefinder 4 is a ranging radar.

[0054] This embodiment also provides a semi-trailer tractor 100, including a tractor 100, a semi-trailer 200 and the saddle adjustment system in the above scheme. The base 11 is fixed to the frame of the tractor 100, and the saddle 12 is used to connect the semi-trailer 200.

[0055] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A saddle adjustment system, characterized in that, include: The saddle assembly (1) includes a base (11) and a saddle (12) that slides with the base (11) along a first horizontal direction (X), the base (11) being used to fix to the frame of the tractor (100) and the saddle (12) being used to connect to the semi-trailer (200). The drive assembly includes a first bidirectional cylinder (21), a first fixed part (211) of the first bidirectional cylinder (21) is fixedly connected to the base (11), a first telescopic part (212) of the first bidirectional cylinder (21) is fixedly connected to the saddle (12), the telescopic direction of the first telescopic part (212) is set along the first horizontal direction (X), and the air source of the tractor (100) is used to supply air to the first bidirectional cylinder (21); The locking assembly has a first state and a second state. In the first state, the saddle (12) and the base (11) are fixed relative to each other. In the second state, the saddle (12) and the base (11) are slidably engaged.

2. The saddle adjustment system according to claim 1, characterized in that, The first bidirectional cylinder (21) includes a first piston chamber and a second piston chamber. Air enters the first piston chamber to make the first telescopic part (212) extend out of the first fixed part (211), and air enters the second piston chamber to make the first telescopic part (212) retract into the first fixed part (211). The drive assembly also includes a first switching valve (22) and a second switching valve (23). The first switching valve (22) is used to control the air source of the tractor (100) to communicate with the first piston chamber, or to control the first piston chamber to communicate with the atmosphere. The second switching valve (23) is used to control the air source of the tractor (100) to communicate with the second piston chamber, or to control the second piston chamber to communicate with the atmosphere.

3. The saddle adjustment system according to claim 1, characterized in that, The base (11) is provided with a sliding hole (111) that extends along the first horizontal direction (X); The first bidirectional cylinder (21) and the saddle (12) are respectively disposed on both sides of the base (11), and the first fixing part (211) is fixedly connected to the base (11); The drive assembly also includes a lever (24), which is inserted into the sliding hole (111) and slides in the sliding hole (111) along the first horizontal direction (X). One end of the lever (24) is fixedly connected to the saddle (12), and the other end of the lever (24) is fixedly connected to the first telescopic part (212).

4. The saddle adjustment system according to claim 1, characterized in that, The saddle assembly (1) further includes a slide rail (13), which is fixed to the base (11) and extends along the first horizontal direction (X). The saddle (12) is provided with a groove (1221), and the slide rail (13) is slidably disposed in the groove (1221).

5. The saddle adjustment system according to claim 4, characterized in that, The slide rail (13) is a T-shaped slide rail (13), and the slide groove (1221) is a T-shaped slide groove (1221).

6. The saddle adjustment system according to claim 4, characterized in that, At least two slide rails (13) are provided, and the at least two slide rails (13) are spaced apart along the second horizontal direction (Y). At least two slide grooves (1221) are provided, and the at least two slide grooves (1221) and the at least two slide rails (13) correspond one-to-one. The first horizontal direction (X) and the second horizontal direction (Y) are perpendicular.

7. The saddle adjustment system according to claim 1, characterized in that, The saddle (12) includes a body (121) and two support frames (122). The two support frames (122) are arranged on both sides of the body (121) along the second horizontal direction (Y). The two support frames (122) and the base (11) slide in cooperation along the first horizontal direction (X). The locking assembly includes a limiting strip (31) and a second bidirectional cylinder (32). The limiting strip (31) is disposed between the two support frames (122) along the second horizontal direction (Y) and extends along the first horizontal direction (X). The surface of the limiting strip (31) opposite to the body (121) is recessed with a plurality of limiting pin holes (311) at intervals along the first horizontal direction (X). The second fixing part (322) of the second bidirectional cylinder (32) is fixed to the body (121) so that the second telescopic part (321) of the second bidirectional cylinder (32) is located above the sliding trajectory of the plurality of limiting pin holes (311). In the first state, the second telescopic part (321) is inserted into the corresponding limiting pin hole (311). In the second state, the second telescopic part (321) is spaced apart from the limiting strip (31).

8. The saddle adjustment system according to claim 7, characterized in that, The locking assembly further includes a limiting sleeve (33), which is located between the body (121) and the limiting strip (31). The limiting sleeve (33) is sleeved on the second telescopic part (321) and slides with the second telescopic part (321). The limiting sleeve (33) is fixedly connected to the body (121).

9. The saddle adjustment system according to any one of claims 1-8, characterized in that, It also includes a rangefinder (4) for monitoring the distance between the tractor (100) and the semi-trailer (200).

10. A semi-trailer tractor (100), characterized in that, Includes the tractor (100), the semi-trailer (200) and the saddle adjustment system according to any one of claims 1-9, wherein the base (11) is fixed to the frame of the tractor (100) and the saddle (12) is used to connect the semi-trailer (200).

Images