An assembly mechanism for anti-roll bar torsion arms and connecting rods and a method of assembly thereof

Abstract

The application discloses an assembling mechanism between anti-roll torsion arms and connecting rods and an assembling method thereof. The assembling mechanism comprises a cylindrical connecting pin and a cylindrical pin sleeve. In application, the inner section of the connecting pin is fixed at the end of the torsion arm, the pin sleeve is sleeved on the outer section of the connecting pin in interference fit, and the pin sleeve is sleeved in the pipe hole of the cylindrical core pipe of the rubber spherical hinge and can rotate in the pipe hole of the core pipe. A baffle with a through bolt hole and a limiting bolt are further included. The outer end of the connecting pin is provided with an axial threaded hole. The baffle is pressed against the outer end of the core pipe of the rubber spherical hinge, the limiting bolt is screwed into the threaded hole of the connecting pin through the through bolt hole of the baffle, and the baffle is pressed tightly by the bolt shank of the limiting bolt.

Description

Technical Field

[0001] This invention relates to an assembly mechanism and assembly method between an anti-roll torsion bar torsion arm and a connecting rod, belonging to the field of anti-roll technology for rail vehicles. Background Technology

[0002] Roll bars are a type of roll bar system used to suppress the roll of rail vehicles during cornering, crosswinds, and other adverse weather conditions. The main components of a roll bar system include a torsion-bearing spring steel roll bar, a torsion arm, and a vertical linkage assembly.

[0003] As vehicle operating speeds and ride comfort requirements increase, higher demands are being placed on the installation and disassembly of the anti-roll torsion bar torsion arm and connecting rod.

[0004] Traditional connecting rods and anti-roll torsion bars use a tapered fit for the torsion arm connection. This primarily involves a tapered hole at the end of the torsion arm and a tapered pin at the lower node of the connecting rod assembly. The end of the torsion arm requires upsetting to machine the tapered hole, and an additional tapered pin is needed at the lower node of the connecting rod assembly. Unlike cylindrical shaft components with the same diameter and round holes with the same diameter, the tapered pin and tapered hole fit requires a precise fit across any cross-section. The machining accuracy of the tapered hole and tapered surface is extremely high, making machining very difficult. Even slight differences can result in a loose fit between the tapered hole and tapered surface, leading to large localized stress differences, reduced service life, and inaccurate positioning during use. If these issues occur, the entire torsion bar or torsion arm must be scrapped, resulting in significant scrapping costs. Furthermore, tapered fits are always interference fits, making disassembly very difficult. Summary of the Invention

[0005] The technical problem to be solved by this invention is: how to solve the problem of high processing difficulty and high assembly and disassembly difficulty in the torsion arm conical surface fit connection of traditional connecting rod and anti-roll torsion bar.

[0006] To address the above problems, the technical solution proposed by this invention is as follows:

[0007] An assembly mechanism between an anti-roll torsion bar torsion arm and a connecting rod includes a cylindrical connecting pin and a cylindrical pin sleeve. In application, the inner section of the connecting pin is fixed to the end of the torsion arm, and the pin sleeve is fitted onto the outer section of the connecting pin with an interference fit. The pin sleeve, together with the outer section of the connecting pin, is fitted into the bore of a cylindrical core tube of a rubber ball joint and can rotate within the bore of the core tube.

[0008] Furthermore, it also includes a baffle with a central bolt hole and a limiting bolt. The outer end of the connecting pin has an axially arranged threaded hole. The baffle presses against the outer end of the core tube of the rubber ball joint. The limiting bolt passes through the bolt hole of the baffle and is screwed into the threaded hole of the connecting pin. The bolt shank of the limiting bolt presses the baffle tight.

[0009] Furthermore, it also includes an inner wear plate and an outer wear plate with a through hole in the center, the inner wear plate and the outer wear plate being respectively pressed against the inner end face and the outer end face of the core tube of the rubber ball joint.

[0010] Furthermore, the outer diameter of the pin sleeve is smaller than the inner diameter of the core tube, and there is a gap between the outer periphery of the pin sleeve and the inner wall of the core tube. Within the gap between the pin sleeve and the core tube, there is an oil film layer formed by grease for lubrication and noise reduction.

[0011] Furthermore, it also includes an inner sealing ring and an outer sealing ring, which are respectively fitted onto both ends of the pin sleeve to seal the oil film layer and maintain expansion pressure on the oil film layer.

[0012] Furthermore, the pin sleeve has an inner boss and an outer boss extending axially at both ends, the outer diameter of the inner boss and the outer boss being smaller than the outer diameter of the pin sleeve. An annular inner sealing position and an outer sealing position with an L-shaped longitudinal cross-section are formed on the outer periphery of both ends of the pin sleeve for installing the inner sealing ring and the outer sealing ring. In application, the inner sealing position and the outer sealing position are both within the tube hole space of the core tube.

[0013] Furthermore, the axial widths of the inner boss and the outer boss are smaller than the axial widths of the inner sealing ring and the outer sealing ring, respectively. The inner wear plate and the outer wear plate pressed against both ends of the core tube can apply and maintain pressure on the inner sealing ring and the outer sealing ring respectively by tightening the limiting bolts.

[0014] Furthermore, the outer sealing ring is composed of an inner half-ring and an outer half-ring; the cross-section of the inner half-ring is D-shaped, its inner surface is an arc-shaped expansion surface, and its outer surface is a flat contact surface one. A through-hole for grease overflow is provided between the expansion surface of the inner half-ring and the flat contact surface one, and the opening of the grease overflow hole on the expansion surface is connected to the gap; the inner side of the outer half-ring has a flat contact surface two for sealing the grease overflow hole, which can fit with the flat contact surface one of the inner half-ring. In application, the flat contact surface one and the flat contact surface two are bonded together with adhesive.

[0015] Furthermore, the outer periphery of the pin sleeve has multiple axial grease reservoirs of equal arc length for storing grease, and multiple circumferential pressure grooves for axial grease pressure.

[0016] An assembly method for the assembly mechanism between the anti-roll torsion bar torsion arm and the connecting rod as described above includes the following steps:

[0017] Step 1: Perform the following steps in sequence:

[0018] 1) Fit the inner wear plate onto the connecting pin close to the torsion arm;

[0019] 2) Install the inner sealing ring in the inner sealing position;

[0020] 3) Fit the pin sleeve onto the outer section of the connecting pin with an interference fit;

[0021] The second step is to apply grease to the inner wall of the core tube and the outer circumference of the pin sleeve, as well as its grease reservoir and pressure groove.

[0022] Step 3: Insert the pin sleeve from the inside end of the core tube until the pin sleeve is completely installed inside the core tube;

[0023] Step 4: Press the inner half of the outer sealing ring into the outer sealing position with force, so that the excess grease in the core tube overflows outward from the grease overflow hole;

[0024] Step 5: Perform the following steps in sequence:

[0025] 4) Remove all excess grease from the inner half of the flat surface;

[0026] 5) Apply adhesive to the inner half-circle flat surface one and / or the outer half-circle flat surface two;

[0027] 6) Attach the outer half of the flat adhesive surface two to the inner half of the flat adhesive surface one to seal the grease hole;

[0028] Step 6: Install the outer wear plate and baffle and tighten the limit bolts. Beneficial effects

[0029] 1. Cylindrical connecting pins and cylindrical pin sleeves are easier to machine than tapered parts;

[0030] 2. The pin sleeve is fitted into the tube hole of the core tube and can rotate. The diameter of the pin sleeve is at least no larger than the diameter of the tube hole of the core tube, so that the rubber ball joint fixed at the lower end of the connecting rod can be easily assembled onto the connecting pin to achieve quick assembly with the torsion arm of the anti-roll torsion bar, and can also be easily disassembled from the torsion arm of the anti-roll torsion bar, thus facilitating the replacement of the assembly parts.

[0031] 3. The pin sleeve can rotate inside the core tube, which can reduce the torsion of the rubber layer of the rubber ball during use and significantly improve the service life of the rubber ball hinge;

[0032] 4. The assembly parts of the assembly mechanism are not easily worn;

[0033] 5. It can achieve vibration reduction and noise reduction. Attached Figure Description

[0034] Figure 1 This is a three-dimensional schematic diagram of the assembly mechanism described in Embodiment 1 after assembly.

[0035] Figure 2 for Figure 1 Disassembly diagram of the assembly mechanism;

[0036] Figure 3This is a three-dimensional schematic diagram of the pin sleeve and other components described in Embodiment 2;

[0037] Figure 4 This is a cross-sectional view of the assembly mechanism described in Embodiment 2 after assembly;

[0038] Figure 5 for Figure 4 A magnified view of a portion of the image;

[0039] Figure 6 for Figure 5 A schematic diagram showing the state of the area after grease has been filled.

[0040] In the diagram: 1. Connecting pin; 101. Threaded hole; 2. Pin sleeve; 201. Inner boss; 202. Outer boss; 203. Inner sealing pressure position; 204. Outer sealing pressure position; 205. Grease reservoir; 206. Pressure groove; 3. Baffle; 301. Through bolt hole; 4. Limiting bolt; 401. Bolt shank; 5. Inner sealing pressure ring; 6. Outer sealing pressure ring; 601. Inner half ring; 6011. Flat contact surface one; 6012. Expansion pressure surface; 6013. Grease overflow hole; 602. Outer half ring; 6021. Flat contact surface two; 7. Inner wear plate; 8. Outer wear plate; 9. Clearance; 10. Grease; 11. Oil film layer; 12. Expansion pressure space; 100. Connecting rod; 200. Rubber ball joint; 210. Rubber layer; 220. Core tube; 300. Torsion arm. Detailed Implementation

[0041] like Figure 1 , 2 As shown, this application relates to a rubber ball joint 200 installed at the lower end of a connecting rod 100. The rubber ball joint 200 has an outer sleeve, a rubber layer 210, and a core tube 220 from the outside in. The rubber layer 210 is capable of twisting and deflecting, and the core tube 220 is used to mount the torsion arm 300 of the anti-roll torsion bar. The assembly mechanism between the anti-roll torsion bar torsion arm and the connecting rod described in this application is actually the assembly mechanism between the torsion arm 300 and the core tube 220 of the rubber ball joint 200.

[0042] The present invention will be further described below with reference to embodiments and accompanying drawings: Example 1

[0043] like Figure 1 , 2As shown, an assembly mechanism between an anti-roll torsion bar torsion arm and a connecting rod includes a cylindrical connecting pin 1 and a cylindrical pin sleeve 2. In application, the inner section of the connecting pin 1 is fixed to the end of the torsion arm 300, and the pin sleeve 2 is fitted onto the outer section of the connecting pin 1 with an interference fit. The pin sleeve 2, together with the outer section of the connecting pin 1, is fitted into the bore of the cylindrical core tube 220 of the rubber ball joint 200 and can rotate within the bore of the core tube 220. In this way, machining the cylindrical connecting pin 1 and the cylindrical pin sleeve 2 is much easier than machining the tapered part. Simultaneously, since the pin sleeve 2, fixed to the connecting pin 1 with an interference fit, is fitted into the bore of the core tube 220 and can rotate, the diameter of the pin sleeve 2 must not exceed the diameter of the bore of the core tube 220. This makes it easy for the rubber ball joint 200 fixed to the lower end of the connecting rod 100 to be assembled onto the connecting pin 1, achieving quick assembly with the torsion arm of the anti-roll torsion bar, and also easy to disassemble from the torsion arm 300 of the anti-roll torsion bar, thus facilitating the replacement of the assembly parts. Furthermore, since the pin sleeve 2 can rotate within the core tube 220, the torsion of the rubber layer 210 of the rubber ball joint 200 can be reduced during use, greatly improving the service life of the rubber ball joint 200.

[0044] The aforementioned assembly mechanism also includes a baffle 3 with a central through-hole 301 and a limiting bolt 4. The outer end of the connecting pin 1 has an axially arranged threaded hole 101. The baffle 3 presses against the outer end of the core tube of the rubber ball joint 200. The limiting bolt 4 passes through the through-hole of the baffle 3 and is screwed into the threaded hole of the connecting pin 1. The baffle is pressed tightly by the bolt shank 401 of the limiting bolt 4. Furthermore, to avoid torsional wear between the baffle 3 and the two ends of the core tube 220, an inner wear plate 7 and an outer wear plate 8 with central through holes are also provided at both ends of the core tube 220. The inner wear plate 7 and the outer wear plate 8 are respectively pressed against the inner end face and the outer end face of the core tube 220 of the rubber ball joint 200. The inner wear plate 7 and the outer wear plate 8 are made of a wear-resistant material with low frictional resistance.

[0045] To reduce wear between the core tube 220 and the pin sleeve 2, the pin sleeve 2 is made of wear-resistant polymer materials such as engineering plastic PET. Example 2

[0046] like Figure 3 As shown in Figure 6, this embodiment is a further improvement of Embodiment 1. The improvement is that the outer diameter of the pin sleeve 2 is smaller than the inner diameter of the core tube 220, and there is a gap 9 between the outer periphery of the pin sleeve 2 and the inner wall of the core tube 220. There is an oil film layer 11 filled with grease 10 in the gap 9 between the pin sleeve 2 and the core tube 220 for lubrication and noise reduction. The presence of the oil film layer 11 can not only greatly extend the service life of the pin sleeve 2, but also completely eliminate the noise caused by the impact between the pin sleeve 2 and the core tube 220.

[0047] It also includes an inner sealing ring 5 and an outer sealing ring 6, which are respectively fitted onto both ends of the pin sleeve to seal the oil film layer 11 and maintain expansion pressure on the oil film layer 11. The expansion pressure maintained on the oil film layer 11 mentioned here means that the inner sealing ring 5 and the outer sealing ring 6 are pre-compressed (a certain amount of pre-compression is necessary to achieve a seal). The pre-compressed inner sealing ring 5 and the outer sealing ring 6 form an expansion pressure on the grease in the oil film layer 11, ensuring that the entire area of ​​the gap 9 between the pin sleeve 2 and the core tube 220 is covered with grease 10.

[0048] Furthermore, the pin sleeve 2 has an inner boss 201 and an outer boss 202 extending axially at both ends, respectively. The outer diameter of the inner boss 201 and the outer boss 202 is smaller than the outer diameter of the pin sleeve 2. An annular inner sealing position 203 and an outer sealing position 204 with an L-shaped longitudinal cross-section are formed on the outer periphery of both ends of the pin sleeve 2 for installing the inner sealing ring 5 and the outer sealing ring 6. In application, the inner sealing position 203 and the outer sealing position 204 are both within the tube hole space of the core tube 220. The axial width of the inner boss 201 and the outer boss 202 is smaller than the axial width of the inner sealing ring 5 and the outer sealing ring 6, respectively. The inner wear plate 7 and the outer wear plate 8 pressed against both ends of the core tube 220 can apply and maintain pressure on the inner sealing ring 5 and the outer sealing ring 6 by tightening the limiting bolt 4, respectively.

[0049] Furthermore: the outer sealing ring 6 is composed of an inner half-ring 601 and an outer half-ring 602; the cross-section of the inner half-ring 601 is D-shaped, its inner side is an arc-shaped expansion surface 6012, and its outer side is a flat contact surface 6011. A through grease overflow hole 6013 is provided between the expansion surface 6012 and the flat contact surface 6011 of the inner half-ring 601. The opening of the grease overflow hole 6013 on the expansion surface 6012 communicates with the gap 9; the inner side of the outer half-ring 602 has a flat contact surface 6021 for sealing the grease overflow hole 6013, which can fit with the flat contact surface 6011 of the inner half-ring 601. In application, the flat contact surface 6011 and the flat contact surface 6021 are bonded together with adhesive. The inner half-ring 601 has a D-shaped cross-section, with its inner surface being an arc-shaped expansion surface 6012 and its outer surface being a flat contact surface 6011. At least a triangular cross-section annular expansion space 12 communicating with the gap 9 is formed between the outer periphery of the arc-shaped expansion surface 6012 and the inner wall of the core tube 220. This allows the grease 10 to fill the annular expansion space 12, thereby maintaining pressure on the grease 10 within the annular expansion space 12 through the pre-compressed outer sealing ring 6. This achieves the aforementioned maintenance of expansion pressure on the oil film layer 11. The aforementioned grease overflow hole 6013 is used to discharge excess grease 10 from the core tube 220 during the assembly of the outer sealing ring 6. The specific functions of the grease overflow hole 6013 and the outer half-ring 602 are described in the assembly method below.

[0050] The outer periphery of the pin sleeve 2 has multiple axial grease reservoirs 205 with equal arc lengths for storing grease 10, and multiple circumferential pressure grooves 206 for axial pressure of grease 10. This allows the grease 10 in the space inside the core tube 220 to communicate with each other. When pressure is applied in one direction, it can flow to other directions to form a damping effect, thereby achieving vibration reduction and noise reduction.

[0051] The assembly method for the above assembly mechanism includes the following steps:

[0052] Step 1: Perform the following steps in sequence:

[0053] 1) Install the inner wear plate 7 onto the connecting pin 1 near the torsion arm;

[0054] 2) Install the inner sealing ring 5 into the inner sealing position 203;

[0055] 3) Fit pin 2 onto the outer section of connecting pin 1 with an interference fit;

[0056] Step 2: Apply grease 10 to the inner wall of the core tube 220 and the outer circumferential surface of the pin sleeve 2, as well as its grease reservoir 205 and pressure groove 206.

[0057] Third step: Insert the pin sleeve 2 from the inner end of the core tube 220 until the pin sleeve 2 is completely installed in the core tube 220, so as to avoid the formation of air bubbles in the grease 10 in the core tube 220;

[0058] Step 4: Press the inner half ring 601 of the outer sealing ring 6 into the outer sealing position 204 with force, so that the excess grease 10 in the core tube 220 overflows outward from the grease overflow hole 6013. It is necessary to ensure that no air bubbles are formed in the grease 10 and to successfully complete the pressing of the outer sealing ring 6.

[0059] Step 5: Perform the following steps in sequence:

[0060] 4) Remove all excess grease from the inner half of the 601 flat-face 6011 surface;

[0061] 5) Apply adhesive to the flat surface 6011 of the inner half-circle 601 and / or the flat surface 6021 of the outer half-circle 602.

[0062] 6) Attach the second flat surface 6021 of the outer half-circle 602 to the first flat surface 6011 of the inner half-circle 601 to seal the grease hole 6013;

[0063] Step 6: Install the outer wear plate 8 and the baffle 3 and tighten the limit bolts 4.

[0064] The above embodiments are only used to describe the present invention more clearly, and should not be regarded as limiting the scope of protection covered by the present invention. Any equivalent modifications should be regarded as falling within the scope of protection covered by the present invention.

Claims

1. An assembly mechanism between an anti-roll torsion bar torsion arm and a connecting rod, characterized in that: The device includes a cylindrical connecting pin (1) and a cylindrical pin sleeve (2). In application, the inner section of the connecting pin (1) is fixed to the end of the torsion arm (300), and the pin sleeve (2) is fitted onto the outer section of the connecting pin (1) with an interference fit. The pin sleeve (2) together with the outer section of the connecting pin (1) is fitted into the tube hole of the cylindrical core tube (220) of the rubber ball joint (200) and can rotate within the tube hole of the core tube (220). The device also includes a limiting bolt (4). The outer end of the connecting pin (1) has an axially arranged threaded hole (101). The limiting bolt (4) is connected to the threaded hole of the connecting pin (1). The bolt shank (401) is pressed against the outer end of the core tube of the rubber ball joint (200); the outer diameter of the pin sleeve (2) is smaller than the inner diameter of the core tube (220), and there is a gap (9) between the outer periphery of the pin sleeve (2) and the inner wall of the core tube (220). There is an oil film layer (11) filled with grease (10) in the gap (9) between the pin sleeve (2) and the core tube (220) for lubrication and noise reduction; it also includes an inner sealing ring (5) and an outer sealing ring (6) respectively fitted on both ends of the pin sleeve to seal the oil film layer (11) and maintain the elasticity of the oil film layer (11) under expansion pressure. The outer sealing ring (6) is composed of an inner half ring (601) and an outer half ring (602); the cross section of the inner half ring (601) is D-shaped, its inner side is an arc-shaped expansion surface (6012), and its outer side is a flat surface (6011). A through grease hole (6013) is provided between the expansion surface (6012) and the flat surface (6011) of the inner half ring (601), and the opening of the grease hole (6013) on the expansion surface (6012) communicates with the gap (9); the inner side of the outer half ring (602) has a flat surface (6021) that can fit with the flat surface (6011) of the inner half ring (601) for sealing the grease hole (6013). When in use, the flat surface (6011) and the flat surface (6021) are glued together.

2. The anti-roll bar torsion arm to link mounting mechanism of claim 1, wherein: It also includes a baffle (3) with a bolt hole (301) in the center. The baffle (3) presses against the outer end of the core tube of the rubber ball joint (200). The limiting bolt (4) passes through the bolt hole of the baffle (3) and is screwed into the threaded hole of the connecting pin (1). The baffle is pressed by the bolt shank (401) of the limiting bolt (4).

3. The anti-roll bar torsion arm to link mounting mechanism of claim 2, wherein: It also includes an inner wear plate (7) and an outer wear plate (8) with a through hole in the center, wherein the inner wear plate (7) and the outer wear plate (8) are respectively pressed against the inner end face and the outer end face of the core tube (220) of the rubber ball joint (200).

4. The assembly mechanism between the anti-roll torsion bar torsion arm and the connecting rod according to claim 3, characterized in that: The pin sleeve (2) has an inner boss (201) and an outer boss (202) extending axially at both ends. The outer diameter of the inner boss (201) and the outer boss (202) is smaller than the outer diameter of the pin sleeve (2). An annular inner sealing position (203) and an outer sealing position (204) with an L-shaped longitudinal section are formed on the outer periphery of both ends of the pin sleeve (2) for installing the inner sealing ring (5) and the outer sealing ring (6). When in use, the inner sealing position (203) and the outer sealing position (204) are both in the tube hole space of the core tube (220).

5. The anti-roll bar torsion arm to link mounting mechanism of claim 4, wherein: The axial widths of the inner boss (201) and the outer boss (202) are smaller than the axial widths of the inner sealing ring (5) and the outer sealing ring (6), respectively. The inner wear plate (7) and the outer wear plate (8) pressed against both ends of the core tube (220) can apply and maintain pressure on the inner sealing ring (5) and the outer sealing ring (6) respectively by tightening the limiting bolt (4).

6. The anti-roll bar torsion arm to link mounting mechanism of claim 5, wherein: The outer periphery of the pin sleeve (2) has multiple axial grease reservoirs (205) of equal arc length for storing grease (10), and multiple circumferential pressure grooves (206) for axial grease (10) pressure.

7. A method of assembling the anti-roll bar torsion arm to link assembly of claim 6, wherein: Includes the following steps: Step 1: Perform the following steps in sequence: 1) Fit the inner wear plate (7) onto the connecting pin (1) close to the torsion arm; 2) Install the inner sealing ring (5) in the inner sealing position (203); 3) Fit the pin sleeve (2) onto the outer section of the connecting pin (1) with an interference fit; Step 2: Apply grease (10) to the inner wall of the core tube (220) and the outer circumferential surface of the pin sleeve (2) and its grease reservoir (205) and pressure groove (206); Step 3: Insert the pin sleeve (2) from the inner end of the core tube (220) until the pin sleeve (2) is completely installed inside the core tube (220); Step 4: Press the inner half ring (601) of the outer sealing ring (6) into the outer sealing position (204) with force, so that the excess grease (10) in the core tube (220) overflows outward from the grease overflow hole (6013); Step 5: Perform the following steps in sequence: 4) Remove all excess grease from the inner half-circle (601) and the flat surface (6011); 5) Apply adhesive to the flat surface one (6011) of the inner half-circle (601) and / or the flat surface two (6021) of the outer half-circle (602); 6) Attach the second flat surface (6021) of the outer half ring (602) to the first flat surface (6011) of the inner half ring (601) to seal the grease hole (6013); Step 6: Install the outer wear plate (8) and baffle (3) and tighten the limit bolts (4).

Images