Train gear box capable of bearing high rotating speed

Abstract

The invention relates to the technical field of gearboxes, and discloses a train gearbox capable of bearing high rotating speed, which comprises a box body, an input shaft, a primary transmission shaft, a secondary transmission shaft, an output shaft, a first bearing system, a second bearing system, a third bearing system and a fourth bearing system. The self-aligning roller bearing has the following advantages and effects that the clearance of the first self-aligning roller bearing, the second self-aligning roller bearing and the third self-aligning roller bearing can be adjusted when the gear box is assembled, and the clearance can be adjusted according to needs in the service process of the gear box, so that the clearance is within a normal error range; and the reliability and the service life of the gearbox are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of gear boxes, and in particular to a train gear box capable of bearing high rotation speed. Background Art

[0002] The train gearbox includes a gear transmission system and bearings, which are used to transmit power, drive the train forward or brake the train. During the service of the gearbox, when the train, especially the high-speed train, is running at high speed, the gear transmission and bearings are subjected to the excitation from the wheel-rail interface and the load of the train system. Their reliability directly affects the dynamic characteristics of the train and the safe operation of the train. As one of the key components that affect the reliability and service life of the gearbox, the bearing clearance needs to be controlled after installation and during operation so that the clearance is within the error range, thereby ensuring the reliability and service life of the gearbox. In the prior art, the bearing clearance in the train gearbox is mainly adjusted by the staff during assembly, and the clearance cannot be adjusted during the service of the gearbox. When the bearing clearance exceeds the error range during the service of the gearbox, the performance and reliability of the gearbox will deteriorate sharply, and the service life will be greatly reduced. For example, during the service of the gearbox, the power loss in the gear tooth meshing process is mainly converted into heat, and the heat will cause the bearing clearance to decrease through heat conduction, convection heat transfer, etc., resulting in thermal shaft failure. Summary of the invention

[0003] The purpose of the present invention is to provide a train gearbox capable of withstanding high rotation speeds and having the effect of conveniently adjusting the bearing clearance.

[0004] The above technical objectives of the present invention are achieved through the following technical solutions: A train gearbox capable of withstanding high rotation speeds, comprising a housing, an input shaft, a primary transmission shaft, a secondary transmission shaft, and an output shaft, wherein at least two first bearing systems are installed between the input shaft and the housing, the first bearing system comprising two first spherical roller bearings, a first mounting seat, and a first adjusting bolt, a first mounting channel is formed in the housing, the first mounting seat is embedded in the first mounting channel, the inner ring of the first spherical roller bearing is fixed to the input shaft, the outer ring of the first spherical roller bearing is fixed to the first mounting seat, a rotating seal is formed between the first adjusting bolt and the housing, and the first adjusting bolt is threadedly connected to the first mounting seat.

[0005] By adopting the above technical solution, the input shaft is installed on the box body through two first bearing systems, and the position of the first mounting seat can be adjusted by rotating the first adjusting bolt, thereby adjusting the position of the outer ring of the first spherical roller bearing. By adjusting the position of the outer ring of the first spherical roller bearing in the two first bearing systems, the two outer rings are moved closer to or farther from each other, thereby achieving the effect of adjusting the clearance of the first spherical roller bearing.

[0006] The present invention is further configured as follows: the first installation channel has a rectangular cross section, the first installation seat also has a rectangular cross section, the first installation seat side surface fits against the inner wall of the first installation channel, and the first installation seat can move along the length direction of the first installation seat.

[0007] By adopting the above technical solution, the first mounting seat can move in the first mounting channel, but cannot rotate relative to the first mounting channel.

[0008] The present invention is further configured as follows: at least one of the first bearing systems further includes a first roller bearing, an inner ring of the first roller bearing is fixed on the input shaft, and an outer ring of the first roller bearing is fixed on the first mounting seat.

[0009] By adopting the above technical solution, since the input shaft rotates at a high speed, the first roller bearing is configured in the first bearing system, so that the input shaft can withstand high speed. The specific type of the first roller bearing can be selected as needed, such as a cylindrical roller bearing.

[0010] Since the first roller bearing and the first spherical roller bearing are located close to each other, the clearance changes of the two are consistent in most cases during the service of the gearbox. Therefore, the present invention fixes the outer ring of the first roller bearing on the first mounting seat, and when the position of the first mounting seat is moved, not only the clearance of the first spherical roller bearing can be adjusted, but also the clearance of the first roller bearing can be adjusted at the same time.

[0011] Since there are at least two first bearing systems, generally, the first roller bearing only needs to be arranged in one of the first bearing systems, and the first roller bearings do not need to be arranged in the remaining first bearing systems.

[0012] The present invention is further configured as follows: a second bearing system is installed between the two ends of the first-level transmission shaft and the housing, the second bearing system includes a second spherical roller bearing, a second mounting seat, and a second adjusting bolt, a second mounting channel is formed in the housing, the second mounting seat is embedded in the second mounting channel, the inner ring of the second spherical roller bearing is fixed to the first-level transmission shaft, the outer ring of the second spherical roller bearing is fixed to the second mounting seat, a rotary seal is formed between the second adjusting bolt and the housing, and the second adjusting bolt is threadedly connected to the second mounting seat.

[0013] By adopting the above technical solution, the second mounting seat position can be adjusted by rotating the second adjusting bolt, thereby adjusting the position of the outer ring of the second spherical roller bearing. By adjusting the positions of the outer rings of the second spherical roller bearings in the two second bearing systems, the two outer rings are moved closer to or farther from each other, thereby achieving the effect of adjusting the clearance of the second spherical roller bearing.

[0014] The present invention is further configured as follows: the second mounting channel has a rectangular cross section, the second mounting seat also has a rectangular cross section, the second mounting seat side surface fits against the inner wall of the second mounting channel, and the second mounting seat can move along the length direction of the second mounting seat.

[0015] By adopting the above technical solution, the second mounting seat can move in the second mounting channel, but cannot rotate relative to the second mounting channel.

[0016] The present invention is further configured as follows: at least one of the second bearing systems further includes a second roller bearing, the inner ring of the second roller bearing is fixed on the primary transmission shaft, and the outer ring of the second roller bearing is fixed on the second mounting seat.

[0017] By adopting the above technical solution, the primary transmission shaft has a high rotation speed, and the second roller bearing is configured in the second bearing system, so that the primary transmission shaft can withstand high rotation speed. The specific type of the second roller bearing can be selected as needed, such as a cylindrical roller bearing.

[0018] Since the second roller bearing and the second spherical roller bearing are located close to each other, the clearance changes of the two are consistent in most cases during the service of the gearbox. Therefore, the present invention fixes the outer ring of the second roller bearing on the second mounting seat, and when the position of the second mounting seat is moved, not only the clearance of the second spherical roller bearing can be adjusted, but also the clearance of the second roller bearing can be adjusted at the same time.

[0019] Since the number of the second bearing systems is at least two, generally, the second roller bearing only needs to be arranged in one of the second bearing systems, and the second roller bearings do not need to be arranged in the remaining second bearing systems.

[0020] The present invention is further configured as follows: a third bearing system is installed between both ends of the secondary transmission shaft and the housing, the third bearing system includes a third spherical roller bearing, the inner ring of the third spherical roller bearing is fixed on the secondary transmission shaft, a first bearing mounting seat is fixed in the housing, and the outer ring of the third spherical roller bearing is fixed on the first bearing mounting seat.

[0021] The present invention is further configured as follows: the secondary transmission shaft includes a central shaft and two adjusting shafts located at both ends of the central shaft, square holes with rectangular cross-sections are provided at both ends of the central shaft, the adjusting shafts have rectangular cross-sections and are inserted into the square holes, each of the adjusting shafts is provided with a countersunk threaded hole, a third adjusting bolt is threadedly connected to the countersunk threaded hole, the third adjusting bolt screw is provided with a first thread segment and a second thread segment, the thread direction of the first thread segment is opposite to the thread direction of the second thread segment, the first thread segment is threadedly connected to the adjusting shaft, the second thread segment is threadedly connected to the central shaft, the head of the third adjusting bolt is located in the countersunk threaded hole, and the opening of the countersunk threaded hole is filled with a sealing plugging piece.

[0022] By adopting the above technical solution, when it is necessary to adjust the clearance of the third spherical roller bearing, remove the sealing plug, rotate the third adjusting bolt to adjust the position of the adjusting shaft on the central axis, and by moving the two adjusting shafts closer to or farther away from each other, the inner rings of the two third spherical roller bearings are driven closer to or farther away from each other, thereby adjusting the clearance of the two third spherical roller bearings.

[0023] In order to reduce and avoid the lubricating oil in the gear box from contacting the third adjusting bolt, the present invention arranges the third adjusting bolt in the countersunk threaded hole, and seals the countersunk threaded hole with a sealing plug.

[0024] The present invention is further configured as follows: two fourth bearing systems are provided between the output shaft and the housing, the fourth bearing system includes a fourth spherical roller bearing, a second bearing mounting seat is fixed in the housing, the inner ring of the fourth spherical roller bearing is fixed on the output shaft, and the outer ring of the fourth spherical roller bearing is fixed on the second bearing mounting seat.

[0025] By adopting the above technical solution, the output shaft has a lower rotation speed than the input shaft, the primary transmission shaft and the secondary transmission shaft, so only the fourth spherical roller bearing is configured, and the clearance adjustment function is not set.

[0026] The present invention is further configured as follows: the input shaft is fixed with a first gear, the first-level transmission shaft is fixed with a second gear and a third gear, the second-level transmission shaft is fixed with a fourth gear, the output shaft is fixed with a fifth gear, the first gear is meshed with the second gear, the third gear is meshed with the fourth gear, and the fourth gear is meshed with the fifth gear.

[0027] By adopting the above technical solution, the input shaft drives the primary transmission shaft to rotate, the primary transmission shaft drives the secondary transmission shaft to rotate, and the secondary transmission shaft drives the output shaft to rotate.

[0028] The beneficial effects of the present invention are:

[0029] 1. In the first bearing system, the position of the outer ring of the first spherical roller bearing is adjusted by the first adjusting bolt and the first mounting seat to adjust the clearance of the first spherical roller bearing. In the second bearing system, the position of the outer ring of the second spherical roller bearing is adjusted by the second adjusting bolt and the second mounting seat to adjust the clearance of the second spherical roller bearing. In the third bearing system, the positions of the two adjusting shafts and the inner ring of the third spherical roller bearing are adjusted by the third adjusting bolt to adjust the clearance of the third spherical roller bearing. The present invention can not only adjust the clearance of the first spherical roller bearing, the second spherical roller bearing and the third spherical roller bearing when the gearbox is assembled, but also adjust them as needed during the service of the gearbox so that the clearance is within the normal error range, thereby ensuring the reliability and service life of the gearbox.

[0030] 2. When the gearbox is in service, due to the high speed of the input shaft and the first-stage transmission shaft, a first roller bearing is configured in one of the first bearing systems of the input shaft, and a second roller bearing is configured in one of the second bearing systems of the first-stage transmission shaft, so that the input shaft and the first-stage transmission shaft can withstand high speeds. The speeds of the second-stage transmission shaft and the output shaft are reduced, so no additional roller bearings are configured in the third bearing system of the second-stage transmission shaft and the fourth bearing system of the output shaft, saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 It is a structural schematic diagram of the present invention.

[0033] Figure 2 yes Figure 1 Enlarged view of point A.

[0034] Figure 3 yes Figure 1 Enlarged view of point B.

[0035] Figure 4 It is a schematic diagram of the structural relationship between the central axis and the adjustment axis of the present invention.

[0036] In the figure, 1, housing; 2, input shaft; 11, first gear; 3, first bearing system; 31, first spherical roller bearing; 32, first mounting seat; 33, first adjusting bolt; 34, first roller bearing; 4, primary transmission shaft; 41, second gear; 42, third gear; 5, second bearing system; 51, second spherical roller bearing; 52, second mounting seat; 53, second adjusting bolt; 54, second roller bearing; 6, secondary transmission shaft; 61, fourth gear; 62, middle shaft; 621, square hole; 63, adjusting shaft; 631, countersunk threaded hole; 64, third adjusting bolt; 65, sealing plug; 7, third bearing system; 71, third spherical roller bearing; 8, output shaft; 81, fifth gear; 9, fourth bearing system; 94, fourth spherical roller bearing. DETAILED DESCRIPTION

[0037] The technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] A train gearbox capable of withstanding high speeds, such as Figure 1 As shown, it includes a housing 1, an input shaft 2, a primary transmission gear, a secondary transmission gear, and an output shaft 8. The input shaft 2 is fixed with a first gear 11, the primary transmission shaft 4 is fixed with a second gear 41 and a third gear 42, the secondary transmission shaft 6 is fixed with a fourth gear 61, and the output shaft 8 is fixed with a fifth gear 81. The first gear 11 is meshed with the second gear 41, the third gear 42 is meshed with the fourth gear 61, and the fourth gear 61 is meshed with the fifth gear 81.

[0039] like Figure 1 , Figure 2 As shown, two first bearing systems 3 are installed between the input shaft 2 and the housing 1, and the first bearing system 3 includes two first spherical roller bearings 31, a first mounting seat 32, and a first adjusting bolt 33. A first mounting channel is formed in the housing 1, and the first mounting seat 32 is embedded in the first mounting channel. The inner ring of the first spherical roller bearing 31 is fixed to the input shaft 2, and the outer ring of the first spherical roller bearing 31 is fixed on the first mounting seat 32. There is a rotary seal between the first adjusting bolt 33 and the housing 1, and the first adjusting bolt 33 is threadedly connected to the first mounting seat 32.

[0040] The cross section of the first installation channel is rectangular, the cross section of the first installation seat 32 is also rectangular, the side of the first installation seat 32 is in contact with the inner wall of the first installation channel, and the first installation seat 32 can move along the length direction of the first installation seat 32. One of the first bearing systems 3 also includes a first roller bearing 34, the inner ring of the first roller bearing 34 is fixed on the input shaft 2, and the outer ring of the first roller bearing 34 is fixed on the first installation seat 32.

[0041] When the clearance of the first spherical roller bearing 31 needs to be adjusted, the first adjusting bolt 33 can be rotated to adjust the position of the first mounting seat 32, thereby adjusting the position of the outer ring of the first spherical roller bearing 31. By adjusting the positions of the outer rings of the first spherical roller bearings 31 in the two first bearing systems 3, the two outer rings are moved closer to or farther from each other, thereby adjusting the clearance of the first spherical roller bearing 31.

[0042] like Figure 1 , Figure 3 As shown, a second bearing system 5 is installed between both ends of the first-stage transmission shaft 4 and the housing 1, and the second bearing system 5 includes a second spherical roller bearing 51, a second mounting seat 52, and a second adjusting bolt 53. A second mounting channel is formed in the housing 1, and the second mounting seat 52 is embedded in the second mounting channel. The inner ring of the second spherical roller bearing 51 is fixed to the first-stage transmission shaft 4, and the outer ring of the second spherical roller bearing 51 is fixed on the second mounting seat 52. A rotary seal is formed between the second adjusting bolt 53 and the housing 1, and the second adjusting bolt 53 is threadedly connected to the second mounting seat 52.

[0043] The second installation channel has a rectangular cross section, the second installation seat 52 also has a rectangular cross section, the side of the second installation seat 52 is in contact with the inner wall of the second installation channel, and the second installation seat 52 can move along the length direction of the second installation seat 52. One of the second bearing systems 5 further includes a second roller bearing 54, the inner ring of the second roller bearing 54 is fixed on the primary transmission shaft 4, and the outer ring of the second roller bearing 54 is fixed on the second installation seat 52.

[0044] When the clearance of the second spherical roller bearing 51 needs to be adjusted, the second adjusting bolt 53 can be rotated to adjust the position of the second mounting seat 52, thereby adjusting the position of the outer ring of the second spherical roller bearing 51. By adjusting the positions of the outer rings of the second spherical roller bearings 51 in the two second bearing systems 5, the two outer rings are moved closer to or farther from each other, thereby adjusting the clearance of the second spherical roller bearing 51.

[0045] like Figure 1 , Figure 4As shown, a third bearing system 7 is installed between both ends of the secondary transmission shaft 6 and the housing 1, and the third bearing system 7 includes a third spherical roller bearing 71, and the inner ring of the third spherical roller bearing 71 is fixed on the secondary transmission shaft 6. A first bearing mounting seat is fixed in the housing 1, and the outer ring of the third spherical roller bearing 71 is fixed on the first bearing mounting seat. The secondary transmission shaft 6 includes a central axis 62 and two adjusting shafts 63 located at both ends of the central axis 62. Square holes 621 with rectangular cross-sections are provided at both ends of the central axis 62. The adjusting shafts 63 have rectangular cross-sections and are inserted into the square holes 621. A countersunk threaded hole 631 is provided on each adjusting shaft 63. A third adjusting bolt 64 is threadedly connected to the countersunk threaded hole 631. The third adjusting bolt 64 screw is provided with a first thread segment and a second thread segment. The thread direction of the first thread segment is opposite to that of the second thread segment. The first thread segment is threadedly connected to the adjusting shaft 63, and the second thread segment is threadedly connected to the central axis 62. The head of the third adjusting bolt 64 is located in the countersunk threaded hole 631, and the opening of the countersunk threaded hole 631 is filled with a sealing plugging member.

[0046] When it is necessary to adjust the clearance of the third spherical roller bearing 71, remove the sealing plug 65, rotate the third adjusting bolt 64 to adjust the position of the adjusting shaft 63 on the central shaft 62, and by moving the two adjusting shafts 63 closer to or farther away from each other, the inner rings of the two third spherical roller bearings 71 are driven closer to or farther away from each other, thereby adjusting the clearance of the two third spherical roller bearings 71.

[0047] Two fourth bearing systems 9 are provided between the output shaft 8 and the housing 1, and the fourth bearing system 9 includes a fourth spherical roller bearing 94. A second bearing mounting seat is fixed in the housing 1, and the inner ring of the fourth spherical roller bearing 94 is fixed on the output shaft 8, and the outer ring of the fourth spherical roller bearing 94 is fixed on the second bearing mounting seat.

Claims

1. A train gearbox capable of withstanding high speeds, Features: The invention comprises a housing (1), an input shaft (2), a primary transmission shaft (4), a secondary transmission shaft (6), and an output shaft (8); at least two first bearing systems (3) are installed between the input shaft (2) and the housing (1); the first bearing system (3) comprises two first spherical roller bearings (31), a first mounting seat (32), and a first adjusting bolt (33); a first mounting channel is formed in the housing (1); the first mounting seat (32) is embedded in the first mounting channel; the inner ring of the first spherical roller bearing (31) is fixed to the input shaft (2); the outer ring of the first spherical roller bearing (31) is fixed to the first mounting seat (32); a rotary seal is formed between the first adjusting bolt (33) and the housing (1); and the first adjusting bolt (33) is threadedly connected to the first mounting seat (32).

2. A train gearbox capable of withstanding high rotation speed according to claim 1, Features: The first installation channel has a rectangular cross-section, the first installation seat (32) also has a rectangular cross-section, the side surface of the first installation seat (32) fits the inner wall of the first installation channel, and the first installation seat (32) can move along the length direction of the first installation seat (32).

3. A train gearbox capable of withstanding high rotation speed according to claim 1, Features: At least one of the first bearing systems (3) further comprises a first roller bearing (34), wherein the inner ring of the first roller bearing (34) is fixed on the input shaft (2), and the outer ring of the first roller bearing (34) is fixed on the first mounting seat (32).

4. A train gearbox capable of withstanding high rotation speed according to claim 1, Features: A second bearing system (5) is installed between the two ends of the primary transmission shaft (4) and the housing (1), the second bearing system (5) comprising a second spherical roller bearing (51), a second mounting seat (52), and a second adjusting bolt (53); a second mounting channel is formed in the housing (1), the second mounting seat (52) is embedded in the second mounting channel, the inner ring of the second spherical roller bearing (51) is fixed to the primary transmission shaft (4), the outer ring of the second spherical roller bearing (51) is fixed to the second mounting seat (52), a rotary seal is formed between the second adjusting bolt (53) and the housing (1), and the second adjusting bolt (53) is threadedly connected to the second mounting seat (52).

5. A train gearbox capable of withstanding high rotation speed according to claim 4, Features: The second mounting channel has a rectangular cross section, the second mounting seat (52) also has a rectangular cross section, the side surface of the second mounting seat (52) is in contact with the inner wall of the second mounting channel, and the second mounting seat (52) can move along the length direction of the second mounting seat (52).

6. A train gearbox capable of withstanding high rotation speed according to claim 4, Features: At least one of the second bearing systems (5) further comprises a second roller bearing (54), wherein the inner ring of the second roller bearing (54) is fixed on the primary transmission shaft (4), and the outer ring of the second roller bearing (54) is fixed on the second mounting seat (52).

7. A train gearbox capable of withstanding high rotation speed according to claim 1, Features: A third bearing system (7) is installed between both ends of the secondary transmission shaft (6) and the housing (1), the third bearing system (7) comprising a third spherical roller bearing (71), the inner ring of the third spherical roller bearing (71) being fixed on the secondary transmission shaft (6), a first bearing mounting seat being fixed in the housing (1), and an outer ring of the third spherical roller bearing (71) being fixed on the first bearing mounting seat.

8. A train gearbox capable of withstanding high rotation speed according to claim 7, Features: The secondary transmission shaft (6) comprises a central shaft (62) and two adjustment shafts (63) located at both ends of the central shaft (62). Both ends of the central shaft (62) are provided with square holes (621) with rectangular cross-sections. The adjustment shafts (63) have rectangular cross-sections and are inserted into the square holes (621). Each of the adjustment shafts (63) is provided with a countersunk threaded hole (631). A third adjustment bolt (64) is threadedly connected to the countersunk threaded hole (631). The screw of the third adjustment bolt (64) is provided with a first threaded section and a second threaded section. The thread direction of the first threaded section is opposite to that of the second threaded section. The first threaded section is threadedly connected to the adjustment shaft (63), and the second threaded section is threadedly connected to the central shaft (62). The head of the third adjustment bolt (64) is located in the countersunk threaded hole (631), and the opening of the countersunk threaded hole (631) is filled with a sealing plug.

9. A train gearbox capable of withstanding high rotation speed according to claim 1, Features: Two fourth bearing systems (9) are provided between the output shaft (8) and the housing (1), the fourth bearing system (9) comprising a fourth spherical roller bearing (94), a second bearing mounting seat being fixed in the housing (1), an inner ring of the fourth spherical roller bearing (94) being fixed on the output shaft (8), and an outer ring of the fourth spherical roller bearing (94) being fixed on the second bearing mounting seat.

10. A train gearbox capable of withstanding high rotation speed according to claim 1, Features: The input shaft (2) is fixed with a first gear (11), the primary transmission shaft (4) is fixed with a second gear (41) and a third gear (42), the secondary transmission shaft (6) is fixed with a fourth gear (61), the output shaft (8) is fixed with a fifth gear (81), the first gear (11) is meshed with the second gear (41), the third gear (42) is meshed with the fourth gear (61), and the fourth gear (61) is meshed with the fifth gear (81).

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