Low-floor tram bogie with single-beam bolster structure

Abstract

The application relates to the rail transit technical field and discloses a one-letter-shaped bolster structure of a low-floor tram bogie, which comprises a bolster body, the bolster body is arranged in a one-letter-shaped mode, a core shaft insertion hole is located at the middle position of the bolster body, spring connected with the bogie is symmetrically arranged at the bottom end of the bolster body, a damping adjusting device is arranged at the top end of the bolster body and surrounds the core shaft insertion hole, the damping adjusting device is arranged on the core shaft, the damping adjusting device adjusts the rotating resistance of the core shaft to adapt to different track curvatures. The one-letter-shaped bolster structure of the low-floor tram bogie is provided, the bolster body is arranged in a one-letter-shaped mode, the train floor height is reduced, and the full low-floor setting in the carriage is realized. The barrier-free passing capacity and the aisle width are improved. The damping adjusting device aims at dynamically adjusting the damping force of the core shaft rotation, and ensures that the bolster body realizes stable and accurate small-angle rotation under different vehicle speeds, track curvatures and load conditions.

Description

Technical Field

[0001] This invention relates to the field of rail transit technology, and more specifically, to a single-line bolster structure for a low-floor tram bogie. Background Technology

[0002] Chinese patent document CN209700669U discloses a bolster and a bolster bogie. The bolster includes a bolster body, secondary vertical stop seats located at both ends of the bolster, and a vertical plane of the bolster; a center pin mounting seat is provided in the middle of the bolster body; a transverse shock absorber mounting seat is provided at the bottom of the bolster body; and an annular mounting seat is provided at the top of the secondary vertical stop seats. This technology has the following shortcomings:

[0003] The bolster is a key component of the bogie, located between the car body and the bogie. However, existing bolster bodies are mostly recessed in the middle, with a height usually exceeding 350mm, making it difficult to achieve a 100% low floor. This results in limited aisle width (<700mm), affecting passenger passage efficiency and accessibility design. Summary of the Invention

[0004] To achieve the above objectives, this invention discloses a linear bolster structure for a low-floor tram bogie, comprising: a bolster body, the bolster body being arranged in a linear shape, a spindle insertion hole located in the middle of the bolster body, springs symmetrically installed at the bottom end of the bolster body and connected to the bogie, and a damping adjustment device installed around the spindle insertion hole at the top end of the bolster body, the damping adjustment device being sleeved on the spindle, the damping adjustment device adjusting the rotational resistance of the spindle to adapt to different track curvatures.

[0005] Preferably, the top of the bolster body is less than 310mm above the ground.

[0006] Preferably, the damping adjustment device includes:

[0007] The lower fixing ring seat is installed on the top of the bolster body, and the inner ring end of the lower fixing ring seat is directly opposite the spindle insertion hole.

[0008] The upper rotating ring seat is rotatably mounted on the top of the lower fixed ring seat. The bottom end of the upper rotating ring seat is integrally formed with a rotating part, which is inserted into the inner ring end of the lower fixed ring seat. The upper rotating ring seat is sleeved on the mandrel.

[0009] The magnetorheological fluid chamber is formed between the lower fixed ring seat and the upper rotating ring seat;

[0010] An electromagnetic coil is mounted on the outer wall of the upper rotating ring seat.

[0011] Adjustment plates, multiple adjustment plates are circumferentially distributed on the inner wall of the upper rotating ring seat.

[0012] Preferably, the top of the lower fixed ring seat and the bottom of the upper rotating ring seat are both open, and when they are fitted together, they form a closed magnetorheological fluid chamber, in which the magnetorheological fluid is stored.

[0013] Preferably, one end of the adjusting plate is rotatably mounted on the inner wall of the upper rotating ring seat, and the other end of the adjusting plate is not directed towards the center end of the upper rotating ring seat. A strip-shaped hole is opened at the top of the upper rotating ring seat, and the strip-shaped hole is connected to the magnetorheological fluid chamber. A rotating plate is sleeved on the top of the upper rotating ring seat, and the rotating plate covers the strip-shaped hole. An adjusting groove is installed at the top of the adjusting plate. One end of the guide slide rod is slidably connected in the adjusting groove, and the other end of the guide slide rod passes through the strip-shaped hole and is slidably connected in the adjusting inclined groove. The adjusting inclined groove is opened at the bottom end of the rotating plate.

[0014] Preferably, the top of the upper rotating ring seat has three sets of electrically telescopic rods arranged in a circular array, and the output end of the electrically telescopic rod is rotatably mounted with a side connecting arm, which is connected to the rotating plate.

[0015] Preferably, there are symmetrically distributed oil replenishing chambers near the bottom of the lower fixed ring seat. The oil replenishing chambers are connected to the inner ring end of the lower fixed ring seat. Two sets of oil replenishing rods are symmetrically distributed in the oil replenishing chambers. The oil is located between the two sets of oil replenishing rods. One end of the oil replenishing rod is fixedly installed on the rotating part, and the other end of the oil replenishing rod abuts against the inner side wall of the oil replenishing chamber.

[0016] Preferably, the oil replenishing rod includes a fixed rod and an adjusting rod. The fixed rod is fixedly installed on the rotating part. One end of the adjusting rod is inserted into the end of the fixed rod away from the rotating part, and the other end of the adjusting rod abuts against the inner wall of the oil replenishing chamber. The return spring is located inside the fixed rod and abuts against the adjusting rod. The inner wall of the oil replenishing chamber includes a smoothing section and an extrusion section. The smoothing section is located between two sets of extrusion sections, and the distance between the smoothing section and the rotating part is greater than the distance between the extrusion section and the rotating part.

[0017] Preferably, the side liquid inlet is located at one end of the two sets of fixed rods close to each other, the side liquid outlet is located on the adjusting rod and communicates with the side liquid inlet, the liquid outlet is located on the rotating part and communicates with the fixed rod, one end of the filter cloth extends into the adjusting rod and is connected to the inner side wall of the adjusting rod near the side liquid inlet end, and the other end of the filter cloth extends into the fixed rod and is connected to the inner side wall of the fixed rod near the side liquid inlet end.

[0018] Preferably, guide plate one and guide plate two are installed inside the fixed rod and the adjusting rod respectively, and guide plate one and guide plate two are slidably connected to each other.

[0019] Compared with the prior art, the present invention has at least the following beneficial effects:

[0020] 1. This invention provides a linear bolster structure for a low-floor tram bogie. The bolster body is arranged in a linear shape, reducing the train floor height and achieving a fully low-floor configuration within the carriage. This improves accessibility and aisle width. The damping adjustment device aims to ensure smooth and precise small-angle rotation of the bolster body under different vehicle speeds, track curvatures, and load conditions by dynamically adjusting the damping force of the spindle rotation. The linear bolster body reduces the train floor height, achieving an aisle width ≥700mm. The damping adjustment device allows for dynamic adjustment of the spindle rotation resistance.

[0021] 2. This invention provides a single-line bolster structure for a low-floor tram bogie. When the spindle rotates, it drives the upper rotating ring seat to rotate on the lower fixed ring seat. An adjusting plate connected to the upper rotating ring seat rotates within the magnetorheological fluid chamber formed between the lower fixed ring seat and the upper rotating ring seat, generating shear resistance. When the electromagnetic coil is energized, it generates a magnetic field, changing the viscosity of the magnetorheological fluid within the chamber and producing a flexible damping force. This controls the rotational resistance of the spindle, improving its smoothness and stability. Furthermore, the tilt adjustment of the rotating plate optimizes the shear area, enhancing the stability and smoothness of the spindle rotation under different operating conditions, particularly during sharp turns or slopes, significantly improving passenger comfort.

[0022] 3. The present invention provides a single-line bolster structure for a low-floor tram bogie. When the spindle rotates, it drives the upper rotating ring seat to rotate on the lower fixed ring seat. The rotating part connected to the upper rotating ring seat rotates at the inner ring end of the lower fixed ring seat, thereby driving the oil replenishing rod connected to the rotating part to rotate in the oil replenishing chamber. Each oil replenishing chamber is provided with two sets of oil replenishing rods. When the spindle rotates (whether it rotates left or right), the oil replenishing rod closer to the rotation direction moves and slides from the smooth section into the extrusion section. Because the distance between the smooth section and the rotating part is greater than the distance between the extrusion section and the rotating part, the extrusion section applies reverse force to the adjusting rod, and the adjusting rod is pressed into the fixed rod. The return spring contracts, and at this time, the volume of the chamber between the two sets of oil replenishing rods becomes smaller, and a positive pressure is formed in the chamber. The oil in the chamber is successively replenished into the fixed rod through the side inlet hole and the side inlet port, and the oil is sprayed onto the surface of the spindle from the outlet port to lubricate the spindle, reduce frictional resistance, and thus improve the smoothness of the spindle's small-angle rotation. Attached Figure Description

[0023] 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.

[0024] Figure 1 This is a schematic diagram of the structure of the present invention;

[0025] Figure 2 This is a top view of the rocker body of the present invention;

[0026] Figure 3 This is a schematic diagram of the damping adjustment device of the present invention;

[0027] Figure 4 This is a schematic diagram of the rotating plate of the present invention;

[0028] Figure 5 for Figure 3 Sectional view at point AA;

[0029] Figure 6 This is a schematic diagram of the oil replenishment chamber structure of the present invention;

[0030] Figure 7 for Figure 6 Enlarged view of section B (Chinese character symbol B).

[0031] In the diagram: 10. Pillar body; 11. Mandrel insertion hole; 12. Bogie; 13. Spring; 14. Damping adjustment device; 15. Lower fixed ring seat; 16. Upper rotating ring seat; 17. Rotating part; 18. Magnetorheological fluid chamber; 19. Electromagnetic coil; 20. Adjusting plate; 21. Strip hole; 22. Rotating plate; 23. Adjusting groove; 24. Guide slide rod; 25. Adjusting inclined groove; 26. Electric telescopic rod; 27. Side connecting arm; 28. Oil replenishing chamber; 29. ​​Oil replenishing rod; 30. Fixed rod; 31. Adjusting rod; 32. Smooth section; 33. Extrusion section; 34. Return spring; 35. Side liquid inlet; 36. Side liquid inlet; 37. Liquid outlet; 38. Filter cloth; 39. Guide plate one; 40. Guide plate two. Detailed Implementation

[0032] The technical solution of the present invention 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 the present invention. 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.

[0033] Please refer to the following: Figures 1 to 7This embodiment provides a linear bolster structure for a low-floor tram bogie, comprising: a bolster body 10, which is arranged in a linear shape; a spindle insertion hole 11 located in the middle of the bolster body 10; springs 13 connected to the bogie 12 symmetrically installed at the bottom end of the bolster body 10; and a damping adjustment device 14 installed around the spindle insertion hole 11 at the top end of the bolster body 10. The damping adjustment device 14 is sleeved on the spindle and adjusts the rotational resistance of the spindle to adapt to different track curvatures.

[0034] The working principle and beneficial effects of the above technical solution are as follows:

[0035] This invention discloses a straight-line bolster structure for a low-floor tram bogie. The bolster body 10 is arranged in a straight line, reducing the train floor height and achieving an aisle width of ≥700mm. The damping adjustment device 14 dynamically adjusts the rotational resistance of the spindle. This invention provides a straight-line bolster structure for a low-floor tram bogie, with the bolster body 10 arranged in a straight line, reducing the train floor height and achieving a fully low-floor interior. This improves barrier-free accessibility and aisle width. The damping adjustment device 14 aims to ensure smooth and precise small-angle rotation of the bolster body 10 under different vehicle speeds, track curvatures, and load conditions by dynamically adjusting the damping force of the spindle rotation.

[0036] In this embodiment, the top of the bolster body 10 is less than 310mm above the ground.

[0037] In this embodiment, the damping adjustment device 14 includes:

[0038] The lower fixing ring seat 15 is installed on the top of the rocker body 10, and the inner ring end of the lower fixing ring seat 15 is directly opposite the spindle insertion hole 11.

[0039] The upper rotating ring seat 16 is rotatably mounted on the top of the lower fixed ring seat 15. The bottom end of the upper rotating ring seat 16 is integrally formed with a rotating part 17, which is inserted into the inner ring end of the lower fixed ring seat 15. The upper rotating ring seat 16 is sleeved on the mandrel.

[0040] The magnetorheological fluid chamber 18 is formed between the lower fixed ring seat 15 and the upper rotating ring seat 16;

[0041] Electromagnetic coil 19 is mounted on the outer wall of the upper rotating ring seat 16;

[0042] Adjustment plates 20, multiple adjustment plates 20 are circumferentially distributed on the inner sidewall of the upper rotating ring seat 16.

[0043] The working principle and beneficial effects of the above technical solution are as follows:

[0044] The damping adjustment device 14 consists of a lower fixed ring seat 15 and an upper rotating ring seat 16, featuring a compact structure suitable for low-floor designs. When the mandrel rotates, it drives the upper rotating ring seat 16 to rotate on the lower fixed ring seat 15. Meanwhile, the adjustment plate 20, connected to the upper rotating ring seat 16, rotates within the magnetorheological fluid chamber 18 formed between the lower fixed ring seat 15 and the upper rotating ring seat 16, generating shear resistance. When the electromagnetic coil 19 is energized, it generates a magnetic field, changing the viscosity of the magnetorheological fluid within the magnetorheological fluid chamber 18 and producing a flexible damping force. This allows for control of the mandrel's rotational resistance, improving the smoothness and stability of the mandrel's rotation.

[0045] In this embodiment, the top end of the lower fixed ring seat 15 and the bottom end of the upper rotating ring seat 16 are both open. When the two are fitted together, they form a closed magnetorheological fluid chamber 18, in which the magnetorheological fluid is stored.

[0046] In this embodiment, one end of the adjusting plate 20 is rotatably mounted on the inner wall of the upper rotating ring seat 16, and the other end of the adjusting plate 20 is not positioned towards the center end of the upper rotating ring seat 16. The top end of the upper rotating ring seat 16 is provided with a strip hole 21, which is connected to the magnetorheological fluid chamber 18. The top end of the upper rotating ring seat 16 is fitted with a rotating plate 22, which covers the strip hole 21. The top end of the adjusting plate 20 is provided with an adjusting groove 23. One end of the guide slide rod 24 is slidably connected to the adjusting groove 23, and the other end of the guide slide rod 24 passes through the strip hole 21 and is slidably connected to the adjusting inclined groove 25. The adjusting inclined groove 25 is opened at the bottom end of the rotating plate 22.

[0047] The working principle and beneficial effects of the above technical solution are as follows:

[0048] The rotating plate 22 covers the strip hole 21 to improve the airtightness of the magnetorheological fluid chamber 18. The rotating plate 22, located at the top of the upper rotating ring seat 16, rotates, thereby driving the guide slide rod 24 to slide in the strip hole 21 through the adjusting groove 25 located at the bottom of the rotating plate 22. When the guide slide rod 24 slides along the strip hole 21, it drives the adjusting plate 20 to rotate on the inner side wall of the upper rotating ring seat 16 through the cooperation with the adjusting groove 23, thereby realizing the tilt adjustment of the rotating plate 22, optimizing the shear area, and enhancing the stability and smoothness of the spindle rotation under different working conditions. Especially when making sharp turns or on slopes, it significantly improves the comfort of the ride.

[0049] In this embodiment, three sets of electrically telescopic rods 26 are distributed in a circular array at the top of the upper rotating ring seat 16. A side connecting arm 27 is rotatably installed at the output end of the electrically telescopic rod 26, and the side connecting arm 27 is connected to the rotating plate 22.

[0050] The working principle and beneficial effects of the above technical solution are as follows:

[0051] The three sets of electrically telescopic rods 26 mounted on the top of the upper rotating ring seat 16 work synchronously, thereby driving the side connecting arm 27 connected to the electrically telescopic rod 26 and the rotating plate 22 connected to the side connecting arm 27 to rotate on the top of the upper rotating ring seat 16. The three sets of electrically telescopic rods 26 respond promptly, improving the stability of the rotating plate 22 on the upper rotating ring seat 16.

[0052] In this embodiment, oil replenishment chambers 28 are symmetrically distributed near the bottom of the lower fixed ring seat 15. The oil replenishment chambers 28 are connected to the inner ring end of the lower fixed ring seat 15. Two sets of oil replenishment rods 29 are symmetrically distributed in the oil replenishment chambers 28. The oil is located between the two sets of oil replenishment rods 29. One end of the oil replenishment rod 29 is fixedly installed on the rotating part 17, and the other end of the oil replenishment rod 29 abuts against the inner sidewall of the oil replenishment chamber 28.

[0053] The working principle and beneficial effects of the above technical solution are as follows:

[0054] When the spindle rotates, it drives the upper rotating ring seat 16 to rotate on the lower fixed ring seat 15. The rotating part 17 connected to the upper rotating ring seat 16 rotates at the inner ring end of the lower fixed ring seat 15, which in turn drives the oil replenishing rod 29 connected to the rotating part 17 to rotate in the oil replenishing chamber 28. Each oil replenishing chamber 28 is provided with two sets of oil replenishing rods 29. When the spindle rotates (whether it rotates to the left or right), the oil in the oil replenishing chamber 28 and located between the two sets of oil replenishing rods 29 is replenished into the oil replenishing rods 29 and sprayed onto the surface of the spindle to lubricate the spindle, thereby reducing frictional resistance and improving the smoothness of the spindle's small-angle rotation.

[0055] In this embodiment, the oil replenishing rod 29 includes a fixed rod 30 and an adjusting rod 31. The fixed rod 30 is fixedly installed on the rotating part 17. One end of the adjusting rod 31 is inserted into the end of the fixed rod 30 away from the rotating part 17, and the other end of the adjusting rod 31 abuts against the inner wall of the oil replenishing chamber 28. The return spring 34 is located inside the fixed rod 30 and abuts against the adjusting rod 31. The inner wall of the oil replenishing chamber 28 includes a smooth section 32 and a pressing section 33. The smooth section 32 is located between two sets of pressing sections 33. The distance between the smooth section 32 and the rotating part 17 is greater than the distance between the pressing section 33 and the rotating part 17.

[0056] The working principle and beneficial effects of the above technical solution are as follows:

[0057] When the mandrel rotates (whether left or right), the oil replenishing rod 29 closest to the direction of rotation moves and slides from the smooth section 32 into the extrusion section 33. Because the distance between the smooth section 32 and the rotating part 17 is greater than the distance between the extrusion section 33 and the rotating part 17, the extrusion section 33 applies reverse force to the adjusting rod 31, and the adjusting rod 31 is pressed into the fixed rod 30. The return spring 34 contracts, and at this time the volume of the chamber between the two sets of oil replenishing rods 29 becomes smaller, and a positive pressure is formed in the chamber. The oil inside is replenished into the oil replenishing rod 29 and sprayed onto the surface of the mandrel.

[0058] In this embodiment, the side liquid inlet 35 is located at one end of the two sets of fixed rods 30 close to each other, the side liquid inlet 36 is located on the adjusting rod 31 and communicates with the side liquid inlet 35, the liquid outlet 37 is located on the rotating part 17 and communicates with the fixed rod 30, one end of the filter cloth 38 extends into the adjusting rod 31 and is connected to the inner side wall of the adjusting rod 31 near the side liquid inlet 36, and the other end of the filter cloth 38 extends into the fixed rod 30 and is connected to the inner side wall of the fixed rod 30 near the side liquid inlet 35.

[0059] The working principle and beneficial effects of the above technical solution are as follows:

[0060] The volume of the chamber between the two sets of oil replenishing rods 29 decreases, and positive pressure is formed in the chamber. The oil inside is successively replenished into the fixed rod 30 through the side inlet hole 35 and the side inlet port 36, and the oil is sprayed onto the surface of the mandrel from the outlet port 37.

[0061] In this embodiment, guide plate 39 and guide plate 40 are respectively installed inside the fixed rod 30 and the adjusting rod 31, and guide plate 39 and guide plate 40 are slidably connected to each other.

[0062] The working principle and beneficial effects of the above technical solution are as follows:

[0063] When the adjusting rod 31 is pressed into the fixed rod 30, the guide plate 40 connected to the adjusting rod 31 slides on the guide plate 39, thereby improving the smoothness of the adjusting rod 31 sliding within the fixed rod 30.

[0064] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A single-line bolster structure for a low-floor tram bogie, characterized in that, include: The bolster body (10) is arranged in a straight line. The spindle insertion hole (11) is located in the middle of the bolster body (10). Springs (13) connected to the bogie (12) are symmetrically installed at the bottom end of the bolster body (10). A damping adjustment device (14) is installed around the spindle insertion hole (11) at the top end of the bolster body (10). The damping adjustment device (14) is sleeved on the spindle. The damping adjustment device (14) adjusts the rotational resistance of the spindle to adapt to different track curvatures. The damping adjustment device (14) includes: a lower fixed ring seat (15) and an upper rotating ring seat (16). The lower fixed ring seat (15) is installed on the top of the bolster body (10), and the upper rotating ring seat (16) is rotatably installed on the top of the lower fixed ring seat (15). The bottom end of the upper rotating ring seat (16) is integrally formed with a rotating part (17), which is inserted into the inner ring end of the lower fixed ring seat (15). The upper rotating ring seat (16) is sleeved on the mandrel. The magnetorheological fluid chamber (18) is formed between the lower fixed ring seat (15) and the upper rotating ring seat (16). The electromagnetic coil (19) is installed on the outer side wall of the upper rotating ring seat (16). Multiple adjustment plates (20) are circumferentially distributed on the inner side wall of the upper rotating ring seat (16). One end of the adjusting plate (20) is rotatably mounted on the inner wall of the upper rotating ring seat (16), and the other end of the adjusting plate (20) is not directed towards the center end of the upper rotating ring seat (16). The top end of the upper rotating ring seat (16) is provided with a strip hole (21), which is connected to the magnetorheological fluid chamber (18). The top end of the upper rotating ring seat (16) is fitted with a rotating plate (22), which covers the strip hole (21). The top end of the adjusting plate (20) is provided with an adjusting groove (23). One end of the guide slide rod (24) is slidably connected to the adjusting groove (23), and the other end of the guide slide rod (24) passes through the strip hole (21) and is slidably connected to the adjusting inclined groove (25). The adjusting inclined groove (25) is located at the bottom end of the rotating plate (22).

2. The linear bolster structure of a low-floor tram bogie according to claim 1, characterized in that, The top of the bolster body (10) is less than 310 mm above the ground.

3. The linear bolster structure of a low-floor tram bogie according to claim 1, characterized in that, The top of the lower fixed ring seat (15) and the bottom of the upper rotating ring seat (16) are both open. When the two are fitted together, they form a closed magnetorheological fluid chamber (18), in which the magnetorheological fluid is stored.

4. The linear bolster structure of a low-floor tram bogie according to claim 1, characterized in that, The top of the upper rotating ring seat (16) has three sets of electric telescopic rods (26) arranged in a circular array. The output end of the electric telescopic rod (26) is rotatably mounted with a side connecting arm (27), which is connected to the rotating plate (22).

5. The linear bolster structure of a low-floor tram bogie according to claim 1, characterized in that, There are symmetrically distributed oil replenishing chambers (28) near the bottom of the lower fixed ring seat (15). The oil replenishing chambers (28) are connected to the inner ring end of the lower fixed ring seat (15). There are two sets of oil replenishing rods (29) symmetrically distributed in the oil replenishing chambers (28). The oil is located between the two sets of oil replenishing rods (29). One end of the oil replenishing rod (29) is fixedly installed on the rotating part (17), and the other end of the oil replenishing rod (29) abuts against the inner side wall of the oil replenishing chamber (28).

6. The linear bolster structure of a low-floor tram bogie according to claim 5, characterized in that, The oil replenishing rod (29) includes a fixed rod (30) and an adjusting rod (31). The fixed rod (30) is fixedly installed on the rotating part (17). One end of the adjusting rod (31) is inserted into the end of the fixed rod (30) away from the rotating part (17). The other end of the adjusting rod (31) abuts against the inner wall of the oil replenishing chamber (28). The return spring (34) is located inside the fixed rod (30) and abuts against the adjusting rod (31). The inner wall of the oil replenishing chamber (28) includes a smooth section (32) and an extrusion section (33). The smooth section (32) is located between the two sets of extrusion sections (33). The distance between the smooth section (32) and the rotating part (17) is greater than the distance between the extrusion section (33) and the rotating part (17).

7. The linear bolster structure of a low-floor tram bogie according to claim 6, characterized in that, The side inlet (35) is located at one end of the two sets of fixed rods (30) close to each other. The side inlet (36) is located on the adjusting rod (31) and communicates with the side inlet (35). The outlet (37) is located on the rotating part (17) and communicates with the fixed rod (30). One end of the filter cloth (38) extends into the adjusting rod (31) and is connected to the inner wall of the adjusting rod (31) near the side inlet (36). The other end of the filter cloth (38) extends into the fixed rod (30) and is connected to the inner wall of the fixed rod (30) near the side inlet (35).

8. The single-line bolster structure of a low-floor tram bogie according to claim 6, characterized in that, Guide plate one (39) and guide plate two (40) are respectively installed inside the fixed rod (30) and the adjusting rod (31), and guide plate one (39) and guide plate two (40) are slidably connected to each other.

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