Connecting structure of bogie drive device with built-in axle box and assembling method thereof

Abstract

The application provides a connecting structure of a built-in axle box bogie driving device and an assembling method thereof. The connecting structure comprises a first hanging seat and a second hanging seat which are connected to the two sides of the bogie, a traction motor and a gear box which are arranged on the inner side of the bogie; one end of the traction motor is provided with an adjustable connecting piece which is vertically connected with the first hanging seat; the power input end of the gear box is drivingly connected with the power output end of the traction motor through a shaft coupling, one end of the gear box is provided with a hanging rod which is vertically connected with the second hanging seat, and the end parts of the gear box and the traction motor which are close to each other are transversely connected through a rubber joint; wherein the adjustable connecting piece and the first hanging seat have a transverse pre-adjustment amount and a vertical pre-adjustment amount. The connecting structure of the built-in axle box bogie driving device and the assembling method thereof can avoid the situation that the displacement ability of the shaft coupling is lost due to the assembling error, and improve the assembling precision of the built-in axle box bogie driving device.

Description

Technical Field

[0001] This invention belongs to the field of rail vehicle technology, specifically relating to a connection structure and assembly method of a built-in axle box bogie drive device. Background Technology

[0002] The development of rail vehicles is increasingly trending towards lightweight, low energy consumption, low wheel-rail interaction, low wear, and low noise. As a result, axle box-integrated bogies have emerged, which can shorten the axle and reduce the frame size, thereby improving the compactness of the bogie structure and reducing the unsprung mass. This helps to reduce wheel-rail wear and reduce the radius of curvature, and has good track adaptability and low energy consumption characteristics.

[0003] Currently, most bogies use a drive system where the traction motor is connected to the gearbox via a coupling, and simultaneously elastically connected via rubber joints. However, compared to traditional external axle box bogies, bogies with built-in axle box bogies have a much more compact internal structure when the track gauge remains constant. The space available for the drive unit is significantly smaller in built-in axle box bogies. Consequently, the coupling's displacement capability is relatively smaller, and assembly errors can cause the coupling to lose some displacement capability after being connected under hydrostatic pressure, further reducing its displacement capability and potentially affecting the normal operation of the bogie. Therefore, the built-in axle box structure requires extremely high assembly precision for the connection between the traction motor and the gearbox, making assembly extremely difficult and a major challenge that has long plagued the industry and urgently needs a solution. Summary of the Invention

[0004] This invention provides a connection structure for a built-in axle box bogie drive device, which aims to avoid the loss of coupling displacement capability due to assembly errors and improve assembly accuracy.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: Firstly, a connection structure for a built-in axle box bogie drive device is provided, comprising:

[0006] The first hanger is fixedly connected to the first side of the bogie;

[0007] The second hanger is fixedly connected to the second side of the bogie that is laterally opposite to the first side.

[0008] The traction motor is located on the inner side of the bogie, with its power output end facing the second side. The end of the traction motor facing the first side is provided with an adjustable connector, which is vertically connected to the first hanger.

[0009] The gearbox is located inside the bogie. The power input end of the gearbox faces the first side and is connected to the power output end of the traction motor through a coupling. The end of the gearbox facing the second side is provided with a hanger rod, which is vertically connected to the second hanger. The ends of the gearbox and the traction motor that are close to each other are laterally connected through rubber joints.

[0010] The adjustable connector has a lateral pre-adjustment amount and a vertical pre-adjustment amount with respect to the first hanging bracket.

[0011] In conjunction with the first aspect, in one possible implementation, the end of the traction motor facing the first side is provided with a connecting seat, the connecting seat is provided with a transverse elongated hole, and an adjustable connector passes through the transverse elongated hole and connects to the connecting seat.

[0012] The lateral pre-adjustment amount is the lateral movement allowance of the adjustable connector within the lateral elongated hole.

[0013] In some embodiments, the top wall of the connector is provided with a first positioning groove, and a transverse elongated hole is provided on the bottom wall of the first positioning groove. The adjustable connector has a positioning part that engages with the first positioning groove.

[0014] For example, the adjustable connector includes:

[0015] The bolt has its head pressing down against the first hanger, and its shank passes down through the first hanger and the transverse elongated hole in sequence. The threaded end of the bolt passing through the transverse elongated hole is connected to a nut.

[0016] A bushing is fitted onto a bolt, with its top end pressing against the head of the bolt and its bottom end having a positioning part.

[0017] The positioning part has two positioning surfaces arranged laterally opposite each other, and the two positioning surfaces respectively abut against the two opposite side walls of the first positioning groove.

[0018] For example, the adjustable connector also includes two sets of washers, both of which are fitted onto the bolt and are located on the upper and lower sides of the first hanger, respectively.

[0019] Among them, the set of gaskets located above the first hanging seat includes m+x gaskets stacked vertically, and the other set of gaskets includes n-x gaskets stacked vertically; where m+n is a fixed value, x is a variable, and the vertical pre-adjustment amount is the sum of the stacking thicknesses of x gaskets.

[0020] In one possible implementation, the adjustable connector also includes:

[0021] The first annular node is fitted onto the bushing and presses downward against the first hanger;

[0022] The second annular node is sleeved on the bushing and is positioned opposite to the first annular node. The second annular node presses upward against the first hanger, and the lower end of the second annular node is nested in the positioning part.

[0023] A compression sleeve is fitted onto the bolt, with its lower end embedded in the first annular node and abutting against the top of the bushing, and the head of the bolt pressing downward against the top wall of the compression sleeve.

[0024] Among them, a set of gaskets located above the first hanger is placed between the first annular node and the pressure sleeve, and another set of gaskets is placed between the second annular node and the connecting seat.

[0025] In some embodiments, a second positioning groove is provided on the top wall of the first hanging seat, and the second positioning groove is engaged with the lower end of the first annular node. A third positioning groove is provided on the bottom wall of the first hanging seat, and the third positioning groove is engaged with the upper end of the second annular node.

[0026] For example, the bottom end of the pressure sleeve is provided with a limiting rib, and the top end of the bushing is provided with a limiting groove, with the limiting rib and the limiting groove being engaged.

[0027] For example, the traction motor and the gearbox are connected by at least two rubber joints that are longitudinally spaced apart.

[0028] The beneficial effects of the connection structure of the built-in axle box bogie drive device provided by the present invention are as follows: Compared with the prior art, the connection structure of the built-in axle box bogie drive device of the present invention, based on the lateral connection of the traction motor and the gearbox through rubber joints, the end of the gearbox away from the traction motor is vertically connected to the second hanger through a hanger rod, and the end of the traction motor away from the gearbox is vertically connected to the first hanger through an adjustable connector. This enables a stable connection between the drive device composed of the traction motor and the gearbox and the bogie. Since the adjustable connector and the first hanger have lateral and vertical pre-adjustment amounts, the lateral and vertical positions of the traction motor can be adaptively adjusted during assembly, thereby improving assembly accuracy and avoiding the loss of coupling displacement capability due to assembly errors after assembly.

[0029] Secondly, embodiments of the present invention also provide an assembly method for a built-in axle box bogie drive device, which is assembled based on the connection structure of the built-in axle box bogie drive device, including:

[0030] Preparation: Assemble the gearbox onto the axle and connect the traction motor to the gearbox via rubber joints; mark the groove wall facing the first side of the first positioning groove on the connecting seat as the first mating surface, and the groove wall facing the second side as the second mating surface, with a distance D1 between the first and second mating surfaces; mark the surface to be machined facing the first side of the pre-installed bushing as the first surface to be machined, and the surface to be machined facing the second side as the second surface to be machined, with a distance D2 between the first and second surfaces to be machined, and D2 > D1; then place the pre-installed bushing on the connecting seat and align the pre-installed bushing with the transverse elongated hole on the connecting seat vertically;

[0031] Bogie pre-assembly: During the pre-assembly process, adjust the lateral position of the pre-assembly bushing on the connecting seat so that the pre-assembly bushing passes upward through the first hanger; assemble the first annular node on the first hanger to ensure that the lower end of the first annular node is embedded in the second positioning groove on the top wall of the first hanger;

[0032] Lateral adjustment: Measure the distance L1 between the first surface to be machined and the first mating surface and / or the distance L2 between the second surface to be machined and the second mating surface; after raising the bogie, remove the pre-installed bushing to be machined, and grind the first surface to be machined and the second surface to be machined to obtain two positioning surfaces, wherein the grinding amount of the first surface to be machined is L1 or D2-D1-L2, and the grinding amount of the second surface to be machined is L2 or D2-D1-L1; then assemble the machined bushing onto the connecting seat, ensuring that the positioning part with two positioning surfaces is embedded in the first positioning groove;

[0033] Bogie assembly: Assemble a set of shims and the second annular node on the bushing in sequence; lower the bogie again so that the bushing passes upward through the first hanger until the top of the second annular node is embedded in the third positioning groove on the bottom wall of the first hanger; assemble the second annular node, another set of shims, and the pressure sleeve in sequence, and then insert bolts and pre-tighten the bolts with the nuts on the connecting seat.

[0034] Vertical adjustment: Measure the distance between the bottom measuring surface of the traction motor and the rail surface to obtain the vertical dimension value that needs to be adjusted; based on the vertical dimension value, remove one or more of the shims in the group below the first hanger and stack them on the group of shims above, or remove one or more of the shims in the group above the first hanger and stack them on the group of shims below.

[0035] The assembly method of the built-in axle box bogie drive device provided by the present invention, compared with the prior art, adopts the connection structure of the built-in axle box bogie drive device. Only one pre-assembly process is needed to determine the grinding amount of the two surfaces to be processed of the bushing. The positioning surface formed after the grinding of the two surfaces to be processed is used to cooperate with the first positioning groove opened on the connecting seat to achieve precise lateral positioning. At the same time, the vertical positioning can also be accurately achieved by changing the number of shims between the two sets of shims. This improves the relative position accuracy of the traction motor and the gearbox, avoids the loss of displacement capability of the coupling used for the transmission connection between the traction motor and the gearbox due to assembly errors, and greatly reduces the difficulty of assembly operation, which helps to improve assembly quality and efficiency. Attached Figure Description

[0036] Figure 1 A three-dimensional structural diagram of the connection structure of the built-in axle box bogie drive device provided in an embodiment of the present invention;

[0037] Figure 2 This is a schematic diagram of the connection structure of the adjustable connector used in an embodiment of the present invention;

[0038] Figure 3 This is a three-dimensional structural diagram of the bushing (after secondary processing) used in an embodiment of the present invention;

[0039] Figure 4 This is a schematic diagram of the positioning part of the pre-installed bushing (before secondary processing and adjustment) used in an embodiment of the present invention;

[0040] Figure 5 This is a schematic diagram illustrating the measurement of the lateral adjustment amount during lateral adjustment in an embodiment of the present invention.

[0041] In the diagram: 10, First hanger; 11, Second positioning groove; 12, Third positioning groove; 20, Second hanger; 30, Traction motor; 31, Connecting seat; 311, Horizontal elongated hole; 312, First positioning groove; 3121, First mating surface; 3122, Second mating surface; 313, Receiving groove; 40, Gearbox; 41, Hanger rod; 50, Adjustable connector; 51, Bolt; 52, Nut; 53, Bushing; 531, Positioning part; 5311, Positioning surface; 5312, Limiting groove; 5313, First surface to be machined; 5314, Second surface to be machined; 54, Gasket; 55, First annular node; 56, Second annular node; 57, Pressure sleeve; 58, Anti-loosening washer; 60, Coupling; 70, Rubber node; 80, Bogie; 81, First side; 82, Second side. Detailed Implementation

[0042] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0043] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or indirectly on the other element. It should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "top," "bottom," "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, not indicating or implying 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. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the invention, "a plurality of" or "several" means two or more, unless otherwise explicitly specified. The term "lateral" refers to the width direction of the rail vehicle, i.e., the axle axis; "longitudinal" refers to the length direction of the rail vehicle; and "vertical" refers to the height direction of the rail vehicle, or can be understood as the vertical direction perpendicular to the rail surface.

[0044] Please refer to the following: Figures 1 to 5 The connection structure of the built-in axle box bogie drive device provided by the present invention will now be described. The connection structure of the built-in axle box bogie drive device includes a first hanger 10, a second hanger 20, a traction motor 30, and a gearbox 40; the first hanger 10 is fixedly connected to a first side 81 of the bogie 80; the second hanger 20 is fixedly connected to a second side 82 of the bogie 80 that is laterally opposite to the first side 81; the traction motor 30 is located inside the bogie 80, with its power output end facing the second side 82; the end of the traction motor 30 facing the first side 81 is provided with an adjustable connector 50, which is connected to the first side 81. The hanger 10 is vertically connected; the gearbox 40 is located inside the bogie 80, the power input end of the gearbox 40 faces the first side 81 and is connected to the power output end of the traction motor 30 through a coupling 60, the end of the gearbox 40 facing the second side 82 is provided with a hanger 41, the hanger 41 is vertically connected to the second hanger 20, and the ends of the gearbox 40 and the traction motor 30 that are close to each other are laterally connected through a rubber node 70; wherein, the adjustable connector 50 has a lateral pre-adjustment amount and a vertical pre-adjustment amount between it and the first hanger 10.

[0045] It should be noted that for the bogie with built-in axle box 80, its drive unit is usually arranged along the axle direction. The traction motor 30 transmits power to the gearbox 40 through the coupling 60. The axle passes through the gearbox 40 and connects with the output gear inside the gearbox 40 to obtain power. Therefore, the relative position of the gearbox 40 and the axle is usually fixed. In this case, the fixed position accuracy of the traction motor 30 is particularly critical because the traction motor 30 and the gearbox 40 are connected by a rubber joint 70. This connection cannot form a completely fixed connection between the two. Therefore, the connection between the traction motor 30 and the bogie 80 is the main factor determining the relative position accuracy between the traction motor 30 and the gearbox 40. Since the fit between the gearbox 40 and the axle ensures the positional accuracy in the longitudinal direction of the vehicle, it is only necessary to consider that the lateral and vertical relative positions between the traction motor 30 and the gearbox meet the requirements to ensure that the power output end of the traction motor 30 is completely aligned with the power input end of the gearbox 40, thereby avoiding the loss of displacement capability of the coupling 60.

[0046] It should be understood that the lateral and vertical pre-adjustment amounts between the adjustable connector 50 and the first hanger 10 in this embodiment are based on the adaptive adjustment of the relative fixed position of the traction motor 30 and the first hanger 10 during the assembly process. Therefore, they are called pre-adjustment amounts. After the assembly is completed, the adjustable connector 50 and the first hanger 10 directly form a stable fixed relationship. At this time, it can be considered that it no longer has the ability to adjust. The purpose is to improve the connection reliability of the traction motor 30, avoid the impact on the normal operation of the vehicle due to misalignment of the connection position during vehicle operation, and ensure operational safety.

[0047] Compared with the prior art, the connection structure of the built-in axle box bogie drive device provided in this embodiment, based on the lateral connection between the traction motor 30 and the gearbox 40 through the rubber joint 70, the end of the gearbox 40 away from the traction motor 30 is vertically connected to the second hanger 20 through the hanger 41, and the end of the traction motor 30 away from the gearbox 40 is vertically connected to the first hanger 10 through the adjustable connector 50. This enables a stable connection between the drive device composed of the traction motor 30 and the gearbox 40 and the bogie 80. Since the adjustable connector 50 and the first hanger 10 have lateral and vertical pre-adjustment amounts, the lateral and vertical positions of the traction motor 30 can be adaptively adjusted during assembly, thereby improving assembly accuracy and avoiding the loss of the coupling 60's displacement capability due to assembly errors after assembly.

[0048] In some embodiments, see Figure 1 and Figure 2The end of the traction motor 30 facing the first side 81 is provided with a connecting seat 31. The connecting seat 31 is provided with a transverse elongated hole 311. The adjustable connector 50 passes through the transverse elongated hole 311 and is connected to the connecting seat 31. The transverse pre-adjustment amount is the transverse movement allowance of the adjustable connector 50 in the transverse elongated hole 311.

[0049] Here, the traction motor 30 adopts a structure in which the transverse elongated hole 311 on the connecting seat 31 cooperates with the adjustable connecting piece 50. The length of the transverse elongated hole 311 can be used to give the adjustable connecting piece 50 a lateral adjustment margin. The lateral relative position accuracy between the traction motor 30 and the gearbox 40 is ensured through adjustment during the assembly process.

[0050] To ensure the connection stability between the adjustable connector 50 and the transverse elongated hole 311, and to prevent the adjustable connector 50 from misaligning within the transverse elongated hole 311 during vehicle operation, in this embodiment, combined with... Figure 2 and Figure 3 It is understood that the top wall of the connecting seat 31 is provided with a first positioning groove 312, and a transverse elongated hole 311 is provided on the bottom wall of the first positioning groove 312. The adjustable connecting member 50 has a positioning part 531 that engages with the first positioning groove 312.

[0051] The specific assembly method of the positioning part 531 and the first positioning groove 312 can be that after the relative position of the adjustable connector 50 and the first positioning groove 312 is determined by a pre-assembly, the adjustable connector 50 is processed a second time to form the positioning part 531 that matches it. Then, during formal assembly, the positioning part 531 is embedded in the first positioning groove 312. This not only ensures the lateral relative position accuracy between the traction motor 30 and the gearbox 40, but also uses the interlocking and positioning of the positioning part 531 and the first positioning groove 312 to avoid lateral misalignment of the adjustable connector 50. This not only improves the connection stability of the adjustable connector 50, but also prevents the bolt 51 from shaking and loosening.

[0052] As one specific embodiment of the adjustable connector 50 described above, please refer to Figure 2 The adjustable connector 50 includes a bolt 51 and a bushing 53. The head of the bolt 51 presses downward against the first hanger 10, and the shank of the bolt 51 passes downward through the first hanger 10 and the transverse elongated hole 311 in sequence. The threaded end of the bolt 51 passing through the transverse elongated hole 311 is connected to a nut 52. The bushing 53 is sleeved on the bolt 51, with its top end pressing upward against the head of the bolt 51 and its bottom end having a positioning part 531. The positioning part 531 has two positioning surfaces 5311 arranged laterally opposite to each other, and the two positioning surfaces 5311 respectively abut against the two opposite sides of the first positioning groove 312.

[0053] The first hanger 10 and the connecting seat 31 are fixedly connected by bolt 51 through the transverse elongated hole 311 and screwed with fastening nut 52. On this basis, the bushing 53 sleeved on the bolt 51 can be positioned by the positioning part 531 at its bottom end engaging with the first positioning groove 312. In addition, when pre-assembling to determine the transverse position, the bushing 53 only needs to be placed on the connecting seat 31 for adaptive adjustment. After the transverse position is determined, the bushing 53 can be removed for secondary processing to form two positioning surfaces 5311. The transverse adjustment process is simple and convenient, which can reduce the assembly difficulty.

[0054] Specifically, in this embodiment, the nut 52 can preferably be a trapezoidal nut 52. On the one hand, it improves the reliability of the screw connection and has a good loosening effect. On the other hand, during assembly, the trapezoidal nut 52 is directly aligned with the screw and placed below the connecting seat 31, and fixed by rotating the bolt 51, thereby avoiding the problem of insufficient operating space below the connecting seat 31.

[0055] It should be understood that the initial size of the positioning part 531 of the bushing 53, specifically the distance between the two positioning surfaces 5311, should be greater than the lateral dimension of the first positioning groove 312. When the bushing 53 is moved during the pre-assembly process to ensure that it can be inserted into the first hanger 10 with the bushing 53 aligned with the transverse elongated hole 311, the distance between the two positioning surfaces 5311 and the two opposite sides of the first positioning groove 312 can be measured. Then, the two positioning surfaces 5311 are subjected to secondary processing, such as grinding, to remove the dimensions that match the measured distance, so that the positioning part 531 can be fitted into the first positioning groove 312. Of course, after secondary processing, the inner hole of the bushing 53 may pass through the center of the positioning part 531 or may be laterally misaligned with the center of the positioning part 531. The misalignment distance depends on the lateral adjustment amount.

[0056] Specifically, such as Figure 4 As shown, the positioning part 531 can be a regular polygon with an even number of sides, such as a square or a regular hexagon, or it can be a circle with two arcs cut off to form two positioning surfaces 5311. Among them, the positioning part 531 with a regular polygon structure is more flexible and can arbitrarily select two opposite surfaces as positioning surfaces 5311. However, the selected positioning surfaces 5311 should be marked during pre-assembly to avoid errors in secondary processing.

[0057] It should be noted that, in this embodiment, see Figure 2The adjustable connector 50 also includes two sets of gaskets 54, both sets of gaskets 54 are sleeved on the bolts 51 and are located on the upper and lower sides of the first hanger 10 respectively; wherein, the set of gaskets 54 located above the first hanger 10 includes m+x gaskets 54 stacked vertically, and the other set of gaskets 54 includes n-x gaskets 54 stacked vertically; wherein, m+n is a fixed value, x is a variable, and the vertical pre-adjustment amount is the sum of the stacking thickness of x gaskets 54.

[0058] By replacing and adjusting the number of the upper and lower sets of shims 54, the vertical distance between the first hanger 10 and the connecting seat 31 can be adjusted while keeping the total number of shims 54 constant. This allows for adjustment of the vertical connection position of the traction motor 30. The adjustment method is simple and easy to operate. Moreover, since the total number of shims 54 remains unchanged, the preload of the bolt 51 can be prevented from changing due to vertical adjustment, thus ensuring the fastening stability of the bolt 51 and effectively preventing the bolt 51 from loosening.

[0059] Specifically, based on the actual assembly vertical accuracy requirements, each of the two sets of shims 54 can be 1mm thick, with two or more shims stacked in each set. When making vertical adjustments, if the measurement determines that the traction motor 30 needs to be raised (e.g., by 1mm), one shim 54 can be removed from the top of the first hanger 10 and inserted into the lower set of shims 54. If the measurement determines that the traction motor 30 needs to be lowered (e.g., by 2mm), two shims 54 can be removed from the bottom of the first hanger 10 and inserted into the upper set of shims 54. The adjustment method is simple and reliable. After the adjustment is completed, since the total number of shims 54 remains unchanged, the preload of the bolt 51 will not change. This not only makes the adjustment simple and convenient but also avoids the problem of loose connection caused by changes in the preload of the bolt 51.

[0060] Further, see Figure 2 The adjustable connector 50 further includes a first annular node 55 and a second annular node 56 sleeved on the bushing 53, and a pressure sleeve 57 sleeved on the bolt 51; the first annular node 55 presses downward against the first hanger 10; the second annular node 56 is disposed opposite to the first annular node 55, and the second annular node 56 presses upward against the first hanger 10, with the lower end of the second annular node 56 nested on the positioning part 531; the lower end of the pressure sleeve 57 is embedded in the first annular node 55 and abuts against the top of the bushing 53, and the head of the bolt 51 presses downward against the top wall of the pressure sleeve 57; wherein, a set of gaskets 54 located above the first hanger 10 is disposed between the first annular node 55 and the pressure sleeve 57, and another set of gaskets 54 is disposed between the second annular node 56 and the connecting seat 31.

[0061] It should be understood that in this embodiment, the first annular node 55 and the second annular node 56 are a pair arranged opposite each other. Both are elastic rubber annular nodes. After the bolt 51 and nut 52 are tightened, the two annular nodes generate a certain amount of compression. Since they are located on the upper and lower sides of the first hanger 10 respectively, they can enable the traction motor 30 and the first hanger 10 to have a certain amount of vertical distance change, so as to meet the radial displacement requirements of the coupling 60, and at the same time, they can also play a role in vibration reduction.

[0062] By setting the pressure sleeve 57 to engage with the first annular node 55 above and press against the top of the bushing 53, the head of the bolt 51 can directly press against the pressure sleeve 57 to form a pressure against the first annular node 55. This avoids the situation where the head of the bolt 51 directly presses against the first annular node 55, which is prone to uneven force on the first annular node 55 due to the small pressure area. At the same time, the engagement relationship between the lower end of the pressure sleeve 57 and the first annular node 55 can not only form radial positioning of the bolt 51, thereby improving the connection stability, but the pressure sleeve 57 can also form circumferential contact and upper and lower end face contact with the first annular node 55 (this end face contact is indirect contact because a set of gaskets 54 are sandwiched between the two). This greatly improves the balance and stability of the circumferential pressure on the first annular node 55, thereby improving the connection reliability.

[0063] To prevent bolt 51 from loosening, an anti-loosening washer can be installed on the top wall of the pressure sleeve 57. The head of bolt 51 presses against the anti-loosening washer 58, transmitting the pressure to the pressure sleeve 57 and improving the reliability of the connection.

[0064] Specifically, such as Figure 2 As shown, in this embodiment, the top wall of the first hanging base 10 is provided with a second positioning groove 11, which is engaged with the lower end of the first annular node 55. The bottom wall of the first hanging base 10 is provided with a third positioning groove 12, which is engaged with the upper end of the second annular node 56.

[0065] The first annular node 55 and the second annular node 56 can be radially positioned by the second positioning groove 11 and the third positioning groove 12 respectively. With the engagement and positioning of the positioning part 531 and the first positioning groove 312, the adjustable connector 50, the first hanger 10 and the connecting seat 31 can simultaneously form a stable relative position relationship, thereby improving the connection position accuracy of the traction motor 30 and avoiding the loss of the coupling 60 displacement capability due to the misalignment of the transition connector during vehicle operation.

[0066] To improve the contact stability between the pressure sleeve 57 and the bushing 53, and to prevent the pressure sleeve 57 from twisting and deforming as the bolt 51 rotates during tightening, thus avoiding stress imbalance in the first annular node 55 due to frictional torque between the pressure sleeve 57 and the first annular node 55, please refer to some embodiments. Figure 2 and Figure 3 The bottom end of the pressure sleeve 57 is provided with a limiting rib, and the top end of the bushing 53 is provided with a limiting groove 5312. The limiting rib and the limiting groove 5312 are engaged. Since the positioning part 531 at the bottom end of the bushing 53 is engaged with the first positioning groove 312, the bushing 53 is fixed. On this basis, the pressure sleeve 57 is circumferentially locked by the engagement of the limiting rib and the limiting groove 5312, thereby preventing the pressure sleeve 57 from rotating with the screw, thus improving the assembly quality and connection stability.

[0067] It is important to understand that, see Figure 1 In this embodiment, the traction motor 30 and the gearbox 40 are connected by at least two longitudinally spaced rubber nodes 70. Considering the installation space, the traction motor 30 and the gearbox 40 are preferably connected laterally by four rubber nodes 70. The four rubber nodes 70 and the first hanger 10 form a total of five connection points, making the traction motor 30 a four-sided pyramidal connection structure. Since the power output end of the gearbox 40 is matched with the axle, the gearbox 40 itself can form a relatively stable connection relationship with the bogie 80. On this basis, the four-sided pyramidal connection structure of the traction motor 30 can ensure its connection stability. At the same time, the laterally connected rubber nodes 70 also ensure the axial displacement capability of the coupling 60.

[0068] Based on the same inventive concept, see also Figures 1 to 5 This application also provides an assembly method for a built-in axle box bogie drive device, which is assembled based on the connection structure of the built-in axle box bogie drive device, and specifically includes the following assembly steps:

[0069] Step S100, Preparation, including:

[0070] Step S101: Assemble the gearbox 40 on the axle and connect the traction motor 30 to the gearbox 40 via the rubber joint 70.

[0071] In step S102, the groove wall of the first positioning groove 312 on the connecting seat 31 facing the first side 81 is marked as the first mating surface 3121, and the groove wall facing the second side 82 is marked as the second mating surface 3122. The distance between the first mating surface 3121 and the second mating surface 3122 is D1.

[0072] In step S103, the surface of the pre-installed bushing facing the first side 81 is marked as the first surface to be processed 5313, and the surface to be processed facing the second side 82 is marked as the second surface to be processed 5314. The distance between the first surface to be processed 5313 and the second surface to be processed 5314 is D2, and D2 > D1.

[0073] Step S104: Place the pre-installed bushing on the connector 31 and align the pre-installed bushing with the transverse elongated hole 311 on the connector 31.

[0074] It should be noted that the pre-installed bushing 53 retains a first surface 5313 and a second surface 5314 to be processed before secondary processing. The remaining surfaces may have been finely processed or may not have been finely processed. They will be finely processed together with the two surfaces to be processed during secondary processing. However, the part of the pre-installed bushing that interlocks with the first hanger 10 needs to be finely processed in the preparation process.

[0075] Step S200, pre-installation of bogie 80, includes:

[0076] Step S201: During the pre-assembly process, adjust the lateral position of the pre-assembly bushing on the connecting seat 31 so that the pre-assembly bushing passes upward through the first hanger 10;

[0077] Step S202: Assemble the first annular node 55 on the first hanger 10, ensuring that the lower end of the first annular node 55 is embedded in the second positioning groove 11 on the top wall of the first hanger 10.

[0078] The pre-assembly process of bogie 80 is actually a wheel-dropping process. During the wheel-dropping process, lateral positioning is completed through at least one annular node. Of course, for ease of operation, the first annular node 55 located above the first hanger 10 is selected for pre-assembly positioning. The lateral relative position between the pre-assembly bushing and the connecting seat 31 after the pre-assembly bushing is inserted into the first hanger 10 is the actual assembly position.

[0079] Step 300, lateral adjustment, including:

[0080] Step 301: Measure the distance L1 between the first surface to be processed 5313 and the first mating surface 3121 and / or the distance L2 between the second surface to be processed 5314 and the second mating surface 3122;

[0081] Step 302: After raising the bogie 80, remove the pre-installed bushing, and grind the first surface to be machined 5313 and the second surface to be machined 5314 to obtain two positioning surfaces 5311. The grinding amount of the first surface to be machined 5313 is L1 or D2-D1-L2, and the grinding amount of the second surface to be machined 5314 is L2 or D2-D1-L1.

[0082] Step 303: Assemble the processed bushing 53 onto the connecting seat 31, ensuring that the positioning part 531 with two positioning surfaces 5311 is embedded in the first positioning groove 312.

[0083] It should be understood that, since the pre-installed bushings were adjusted laterally during the pre-assembly of the bogie 80, taking the maximum adjustable amount as half the length of the transverse elongated hole 311 as an example, in order to ensure that the two surfaces to be machined have sufficient machining allowance, D2-D1 should be greater than half the length of the transverse elongated hole 311 when the center of the inner hole of the bushing 53 coincides with the center of the positioning part 531.

[0084] In actual assembly, due to the limited space near the first side 81 of the traction motor 30, it is difficult to measure the distance between the first surface to be machined 5313 and the first mating surface 3121. Moreover, the measurement accuracy is difficult to guarantee due to the limited operating space. Therefore, when determining the grinding amount of the surface to be machined, only the distance L2 between the second surface to be machined 5314 and the second mating surface 3122, which has relatively sufficient operating space, can be measured. Thus, the grinding amount of the first surface to be machined 5313 is determined to be D2-D1-L2, and the grinding amount of the second surface to be machined 5314 is determined to be L2. This is not only convenient to operate, but also ensures the relative position and dimensional accuracy of the two positioning surfaces 5311 obtained in the end, thereby improving the final assembly accuracy.

[0085] Step S400, bogie 80 assembly, includes:

[0086] Step S401: Assemble a set of gaskets 54 and a second annular node 56 on the bushing 53 in sequence;

[0087] Step S402: Lower the bogie 80 again so that the bushing 53 passes upward through the first hanger 10 until the top of the second annular node 56 is embedded in the third positioning groove 12 on the bottom wall of the first hanger 10.

[0088] In step S403, after assembling the second annular node 56, another set of gaskets 54, and pressure sleeve 57 in sequence, bolts 51 are inserted and pre-tightened by screwing the bolts 51 to the nuts 52 on the connecting seat 31.

[0089] It should be noted that during the pre-assembly of the bogie 80 in step S200, the bolt 51 does not need to be screwed onto the nut 52, and it can even be completed without the bolt 51 being inserted. Of course, to improve the accuracy of lateral adjustment, it is best to insert the bolt 51 into the transverse elongated hole 311. However, during the assembly of the bogie 80 in step S400, the bolt 51 and nut 52 need to be tightened. Specifically, a receiving groove 313 for accommodating the nut 52 is formed between the connecting seat 31 and the main body of the traction motor 30. During assembly, the nut 52 can be inserted into the receiving groove 313 first, and then the assembly can be completed according to the distribution in step S400. The nut 52 can preferably be a trapezoidal nut 52. When tightening, the head of the bolt 51 is engaged with a wrench to tighten it. The nut 52 is constrained by the space of the receiving groove 313, so it does not need to be engaged with a wrench and will not rotate. On the one hand, this reduces the difficulty of operation, and on the other hand, since the nut 52 cannot rotate in the receiving groove 313, it has an anti-loosening function, thereby preventing the connection from becoming loose and improving the reliability of the connection.

[0090] Step S500, vertical adjustment, including:

[0091] Step S501: Measure the distance between the bottom measuring surface of the traction motor 30 and the rail surface to obtain the vertical dimension value that needs to be adjusted;

[0092] In step S502, based on the vertical dimension value that needs to be adjusted, one or more of the pads 54 located below the first hanger 10 are removed and superimposed on the upper set of pads 54, or one or more of the pads 54 located above the first hanger 10 are removed and superimposed on the lower set of pads 54.

[0093] By adjusting the vertical height of the traction motor 30 by adding or removing shims 54 while keeping the total number constant, it is possible to avoid changes in the thickness of the shims 54, which would lead to changes in the compression of the first annular node 55 and the second annular node 56, thereby causing a decrease in the preload of the bolt 51 and resulting in loosening of the connection or affecting the radial and especially vertical displacement capacity of the coupling 60.

[0094] Compared with the prior art, the assembly method of the built-in axle box bogie drive device provided in this embodiment adopts the connection structure of the built-in axle box bogie drive device. Only one pre-assembly process is needed to determine the grinding amount of the two surfaces to be processed of the bushing 53. The positioning surface 5311 formed after the two surfaces to be processed are used to cooperate with the first positioning groove 312 opened on the connecting seat 31 to achieve precise lateral positioning. At the same time, the vertical positioning can also be accurately positioned by changing the number of shims 54 between the two sets of shims 54. This improves the relative position accuracy of the traction motor 30 and the gearbox, avoids the loss of displacement capability of the coupling 60 used for the transmission connection between the traction motor 30 and the gearbox due to assembly errors, and greatly reduces the difficulty of assembly operation, which helps to improve assembly quality and efficiency.

[0095] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A connection structure for a built-in axle box bogie drive unit, characterized in that, include: The first hanger is fixedly connected to the first side of the bogie; The second hanger is fixedly connected to the second side of the bogie that is laterally opposite to the first side. A traction motor is located on the inner side of the bogie, with its power output end facing the second side. The end of the traction motor facing the first side is provided with an adjustable connector, which is vertically connected to the first hanger. A gearbox is located inside the bogie. The power input end of the gearbox faces the first side and is connected to the power output end of the traction motor via a coupling. A suspension rod is provided at the end of the gearbox facing the second side. The suspension rod is vertically connected to the second suspension seat, and the ends of the gearbox and the traction motor that are close to each other are laterally connected by a rubber joint. The adjustable connector has a lateral pre-adjustment amount and a vertical pre-adjustment amount with the first hanging seat; the end of the traction motor facing the first side is provided with a connecting seat, the connecting seat is provided with a horizontal elongated hole, the adjustable connector passes through the horizontal elongated hole and is connected to the connecting seat; wherein, the lateral pre-adjustment amount is the lateral movement allowance of the adjustable connector within the horizontal elongated hole. The top wall of the connector is provided with a first positioning groove, the transverse elongated hole is provided on the bottom wall of the first positioning groove, and the adjustable connector has a positioning part that engages with the first positioning groove. The adjustable connector includes: A bolt, the head of which presses downward against the first hanger, the shank of which passes downward through the first hanger and the transverse elongated hole, and the threaded end of the bolt passing through the transverse elongated hole is connected to a nut; A bushing is fitted onto the bolt, with its top end pressing against the head of the bolt and its bottom end having the positioning part. The positioning part has two positioning surfaces arranged laterally opposite each other, and the two positioning surfaces respectively abut against the two opposite side walls of the first positioning groove. The adjustable connector further includes two sets of gaskets, both sets of gaskets being fitted onto the bolt and located on the upper and lower sides of the first hanger, respectively; wherein, one set of gaskets located above the first hanger includes m+x gaskets stacked vertically, and the other set of gaskets includes n-x gaskets stacked vertically; wherein, m+n is a fixed value, x is a variable, and the vertical pre-adjustment amount is the sum of the stacked thicknesses of x gaskets.

2. The connection structure of the built-in axle box bogie drive device as described in claim 1, characterized in that, The adjustable connector also includes: The first annular node is sleeved on the bushing and presses downward against the first hanger; The second annular node is sleeved on the bushing and is positioned opposite to the first annular node. The second annular node presses upward against the first hanger, and the lower end of the second annular node is nested on the positioning part. A pressure sleeve is fitted onto the bolt, with its lower end embedded in the first annular node and abutting against the top of the bushing, and the head of the bolt pressing downward against the top wall of the pressure sleeve; Among them, one set of the gaskets located above the first hanging seat is disposed between the first annular node and the pressure sleeve, and another set of the gaskets is disposed between the second annular node and the connecting seat.

3. The connection structure of the built-in axle box bogie drive device as described in claim 2, characterized in that, The first hanging base has a second positioning groove on its top wall, which is engaged with the lower end of the first annular node. The first hanging base has a third positioning groove on its bottom wall, which is engaged with the upper end of the second annular node.

4. The connection structure of the built-in axle box bogie drive device as described in claim 2, characterized in that, The bottom end of the pressure sleeve is provided with a limiting rib, and the top end of the bushing is provided with a limiting groove. The limiting rib and the limiting groove are engaged.

5. The connection structure of the built-in axle box bogie drive device as described in claim 2, characterized in that, The traction motor is connected to the gearbox via at least two rubber nodes that are longitudinally spaced apart.

6. An assembly method for a built-in axle box bogie drive unit, characterized in that, Assembly based on the connection structure of the built-in axle box bogie drive unit as described in any one of claims 1-5 includes: Preparation: Assemble the gearbox onto the axle and connect the traction motor to the gearbox via the rubber joint; mark the groove wall of the first positioning groove on the connecting seat facing the first side as the first mating surface, and the groove wall facing the second side as the second mating surface, with a distance D1 between the first mating surface and the second mating surface; mark the surface of the pre-installed bushing facing the first side as the first surface to be processed, and the surface to be processed facing the second side as the second surface to be processed, with a distance D2 between the first surface to be processed and the second surface to be processed, and D2 > D1; then place the pre-installed bushing on the connecting seat, aligning the pre-installed bushing vertically with the transverse elongated hole on the connecting seat; Bogie pre-assembly: During the pre-assembly process, adjust the lateral position of the pre-assembly bushing on the connecting seat so that the pre-assembly bushing passes upward through the first hanger; assemble the first annular node on the first hanger, ensuring that the lower end of the first annular node is embedded in the second positioning groove on the top wall of the first hanger; Lateral adjustment: Measure the distance L1 between the first surface to be machined and the first mating surface and / or the distance L2 between the second surface to be machined and the second mating surface; after raising the bogie, remove the pre-installed bushing, and grind the first surface to be machined and the second surface to be machined to obtain two positioning surfaces, wherein the grinding amount of the first surface to be machined is L1 or D2-D1-L2, and the grinding amount of the second surface to be machined is L2 or D2-D1-L1; then assemble the machined bushing on the connecting seat to ensure that the positioning part with two positioning surfaces is embedded in the first positioning groove; Bogie assembly: Assemble a set of shims and a second annular node on the bushing in sequence; lower the bogie again so that the bushing passes upward through the first hanger until the top of the second annular node is embedded in the third positioning groove on the bottom wall of the first hanger; assemble the second annular node, another set of shims, and a pressure sleeve in sequence, then insert bolts and pre-tighten the bolts with the nuts on the connecting seat; Vertical adjustment: Measure the distance between the bottom measuring surface of the traction motor and the rail surface to obtain the vertical dimension value that needs to be adjusted; based on the vertical dimension value, remove one or more of the shims from the group below the first hanger and stack them on the group above the first hanger, or remove one or more of the shims from the group above the first hanger and stack them on the group below the first hanger.

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