Low-floor gearbox output shaft and connecting mechanism

Abstract

The utility model discloses a low-floor gear box output shaft and a connecting mechanism. The low-floor gear box output shaft comprises a hollow output shaft body, a brake disc installation position is arranged at the end of the output shaft body, a driven gear installation position of a gear box is arranged on the outer circumferential face of the output shaft body, and a wheel installation position is arranged on the outer circumferential face of the other end of the output shaft body. A shaft body of the output shaft is provided with a through cavity, and the axle bridge is installed in the cavity. The cavity of the shaft body of the output shaft is fully utilized, the internal space is directly connected with the axle bridge, a plurality of structure installation positions are arranged on the shaft body of the output shaft, use of couplings is omitted, shaft system parts are greatly simplified, the structure is compact, and the occupied space is reduced; and the problems of short maintenance period and the like caused by rubber of a coupling can be avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to gear box output shaft technical field more specifically, relate to a low floor gear box output shaft and connecting mechanism. BACKGROUND

[0002] In prior art, low floor gear box is connected through the end tooth of output shaft and flexible coupling, flexible coupling is connected with wheel web, wheel hub and axle bridge are connected, so that the rotation of traction motor is transmitted to wheel, and vehicle is driven to advance. The shafting connection scheme of the output shaft is complex in structure, occupies large space, and is difficult to be applied to the narrow installation space of low floor vehicle. Therefore, it is necessary to reduce the volume of the structure and reduce the occupied space. In addition, the flexible element of the flexible coupling is mainly composed of rubber and metal framework. Since the rubber has aging phenomenon, the service life and maintenance cycle of the flexible coupling are short, and there are problems such as high failure rate.

[0003] In CN106763262B, a 100% low floor vehicle gear box output coupling and its transmission method are disclosed. The output coupling includes a transmission hollow shaft and a gear box transmission part. The transmission hollow shaft includes a hollow shaft and a wheel transmission disc arranged on one end of the hollow shaft. The gear box transmission part is connected with the other end of the hollow shaft. The gear box output shaft is connected with the gear box transmission part. The hollow shaft is a hollow conical frustum. The wheel transmission disc is arranged on the side of the large end of the hollow shaft. The wheel is connected with the wheel transmission disc. When the wheel is connected with the wheel transmission disc, the protruding part of the outer side of the wheel is located in the cavity of the large end of the hollow shaft. The hollow shaft is designed as a hollow conical frustum. The space of the large end is used as the accommodation cavity of the protruding part of the outer side of the wheel. When the wheel is connected with the wheel transmission disc, the protruding part of the outer side of the wheel is accommodated in the space of the large end of the hollow shaft. The transmission part of the protruding part of the outer side of the wheel is avoided. The axial dimension of the transmission hollow shaft is reduced. The dimension of the entire gear box output coupling is also reduced. The patent reduces the installation space requirement of the entire gear box output coupling. In addition, the intermediate link during torque transmission is reduced. The failure rate is reduced. The transmission effect is ensured. However, the utilization rate of the transmission hollow shaft in the coupling scheme of the gear box and the wheel provided by the patent is not enough. The space is not optimized. The connection of the axle bridge also needs to be considered. Therefore, the occupied space of the structure is still large. It is difficult to meet the installation requirement of smaller space. In addition, the patent needs to increase the output coupling part between the gear box and the wheel. The service life and maintenance cycle of the coupling are the weakest link of the entire transmission system. The aging of the coupling rubber affects the maintenance cycle and service life of the entire transmission system. The maintenance and repair cycle of the transmission part is reduced. The maintenance cost is increased. SUMMARY

[0004] The technical problem to be solved by this utility model is to address the shortcomings of existing gearbox output structures, such as insufficient space optimization and short maintenance cycles, by providing a low-floor gearbox output shaft and connecting mechanism.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A low-floor gearbox output shaft includes a hollow output shaft body. The output shaft body includes a connected straight cylindrical section one and a straight cylindrical section two. The end of the straight cylindrical section one is provided with a brake disc mounting position. Multiple bearing mounting positions are provided on the outer circumference of the straight cylindrical section one. A wheel mounting web is provided on the outer circumference of the straight cylindrical section two. The wheel mounting web is provided with wheel mounting holes. The output shaft body has a cavity structure, and the cavity is provided with a shaft bridge mounting surface and a shaft bridge bearing mounting surface.

[0007] Furthermore, the bearing mounting position includes a gearbox bearing mounting position and a driven gear mounting position.

[0008] Furthermore, the shoulder height of the bearing mounting position is lower than the inner ring height of the tapered roller bearing.

[0009] Furthermore, an oil injection hole and an arc-shaped groove are provided on the outer circumferential surface of the straight cylindrical section. The oil injection hole and the arc-shaped groove are connected to facilitate the oiling and disassembly of the driven gear.

[0010] Furthermore, the cavity of the output shaft body includes a trumpet-shaped shaft bridge mounting slope, and shaft bridge bearing mounting surfaces are provided on both sides of the shaft bridge mounting slope. The smaller opening of the trumpet-shaped shaft bridge mounting slope is located in the first straight section, and the larger opening of the trumpet-shaped structure is located in the second straight section.

[0011] Furthermore, the inner wall bearing mounting surface of the second straight section has a groove on the shoulder to ensure the strength of the output shaft and facilitate disassembly.

[0012] Furthermore, a water-throwing ring is provided on the straight cylindrical section two of the output shaft body, which can effectively throw away water droplets splashed from the bottom of the vehicle by the centrifugal force of the output shaft rotation, preventing external water droplets from entering the gearbox and causing phenomena such as lubricating oil emulsification.

[0013] Furthermore, the diameter of the outer circumferential surface of the first straight cylinder section is smaller than the diameter of the outer circumferential surface of the second straight cylinder section.

[0014] A low-floor gearbox output shaft connection mechanism includes a gearbox, an output shaft body, a driven gear, and a shaft bridge. One end of the output shaft body is connected to a brake disc, and the other end is connected to a wheel. The gearbox is mounted on the outer circumferential surface of the output shaft body via a supporting tapered roller bearing. The driven gear is mounted on the outer circumferential surface of the output shaft body via an interference fit. The shaft bridge is mounted in the cavity of the output shaft body via a shaft bridge bearing.

[0015] Further, gear box labyrinth seal structure is arranged on both sides of the gear box, so that lubricating oil of the lubricating bearing cannot leak to the outside of the gear box.

[0016] Further, the cavity of the output shaft body is provided with a shaft bridge labyrinth seal structure, so that lubricating oil of the lubricating bearing cannot leak to the outside of the shaft bridge.

[0017] Compared with the prior art, the beneficial effects are:

[0018] The hollow output shaft body is in a straight cylindrical shape, the driving device and the wheel are connected through the mounting position at the end, the rotary motion is directly transmitted to the wheel, the output coupling part is reduced, the connection structure of the gear box output end to the wheel is simplified, the intermediate link of torque transmission is reduced, and the failure rate of the transmission system is reduced. At the same time, the connection structure of the output shaft directly connected with the wheel has larger torque of transmission. Meanwhile, the cavity of the output shaft body is fully utilized, the shaft bridge is directly connected by using the internal space, and a plurality of bearing mounting positions are arranged on the output shaft body, so that the use of the shaft coupling is omitted. The shaft system parts are greatly simplified, the structure is compact, the occupied space is reduced, and the problems of short maintenance period caused by the use of rubber in the shaft coupling are avoided. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a low-floor gear box output shaft three-dimensional structure schematic diagram;

[0020] Figure 2 It is a low-floor gear box output shaft cross-sectional structure schematic diagram;

[0021] Figure 3 It is a low-floor gear box output shaft connection mechanism cross-sectional structure schematic diagram.

[0022] Wherein, 1 is a straight cylinder section, 2 is a straight cylinder section, 3 is a first gear box labyrinth seal structure mounting shaft section, 4 is a gear box supporting conical roller bearing one mounting shaft section, 5 is a driven gear mounting shaft section, 6 is a gear box supporting conical roller bearing two mounting shaft section, 7 is a second gear box labyrinth seal structure mounting shaft section, 8 is a wheel mounting web, 9 is a water throwing ring, 10 is a brake disc mounting hole, 11 is an oil injection hole, 12 is an arc-shaped groove, 13 is a wheel mounting hole, 14 is a first shaft bridge labyrinth seal structure mounting shaft section, 15 is a shaft bridge conical roller bearing one mounting shaft section, 16 is a shaft bridge mounting shaft section, 17 is a shaft bridge conical roller bearing two mounting shaft section, 18 is a wheel, 19 is a driven gear, 20 is a gear box supporting conical roller bearing one, 21 is a gear box supporting conical roller bearing two, 22 is a shaft bridge conical roller bearing one, 23 is a shaft bridge conical roller bearing two, and 24 is a shaft bridge. DETAILED DESCRIPTION

[0023] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative efforts fall within the scope of the present application.

[0024] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back), the directional indications are only used to explain the relative positional relationship, movement condition and the like between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications also change accordingly. If the embodiments of the present application involve descriptions of "first", "second" and the like, the descriptions of "first", "second" and the like are only for description purposes, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features with "first" and "second" can explicitly or implicitly include at least one of the features.

[0025] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "connection" and the like should be understood in a broad sense, for example, "connection" can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0026] In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the scope of protection required by the present application.

[0027] Embodiment 1

[0028] The embodiment provides a low-floor gearbox output shaft, which comprises a hollow output shaft body, the output shaft body comprises connected straight cylinder section one 1 and straight cylinder section two 2, the diameter of the outer circumferential surface of the straight cylinder section one 1 is smaller than the diameter of the outer circumferential surface of the straight cylinder section two 2. The output shaft body is internally provided with a cavity penetrating through, the cavity is internally provided with a shaft bridge labyrinth seal structure and a shaft bridge tapered roller bearing. The cavity comprises a shaft bridge installation inclined surface of a horn structure, the small opening of the horn structure in the cavity is located at the straight cylinder section one 1, the large opening of the horn structure is located at the straight cylinder section two 2, the inner wall of the straight cylinder section one 1 to the straight cylinder section two 2 comprises a first shaft bridge labyrinth seal structure installation shaft section 14, a shaft bridge tapered roller bearing one installation shaft section 15, a shaft bridge installation shaft section 16 and a shaft bridge tapered roller bearing two installation shaft section 17.

[0029] The shaft shoulder is arranged between the shaft bridge tapered roller bearing one installation shaft section 15 and the shaft bridge installation shaft section 16, the size of the shaft shoulder is higher than the bearing outer height of the shaft bridge tapered roller bearing, and the shaft shoulder facilitates disassembly.

[0030] The end of the straight cylinder section one 1 is provided with a brake disc installation hole 10, the straight cylinder section one 1 is provided with a gearbox labyrinth seal structure, a gearbox and a driven gear 19, and the outer circumferential surface of the straight cylinder section one 1 comprises, in sequence, a first gearbox labyrinth seal structure installation shaft section 3, a gearbox support tapered roller bearing one installation shaft section 4, a driven gear installation shaft section 5, a gearbox support tapered roller bearing two installation shaft section 6 and a second gearbox labyrinth seal structure installation shaft section 7.

[0031] The driven gear 19 installation shaft section is provided with an oil injection hole 11 and an arc-shaped groove 12, the oil injection hole 11 and the arc-shaped groove 12 are communicated, oil injection and disassembly of the driven gear 19 are facilitated.

[0032] The shaft shoulder is arranged between the gearbox support tapered roller bearing one installation shaft section 4, the driven gear installation shaft section 5, the gearbox support tapered roller bearing two installation shaft section 6 and the second gearbox labyrinth seal structure installation shaft section 7, and the height of the shaft shoulder is lower than the inner ring height of the tapered roller bearing at the shaft section, and the shaft shoulder facilitates disassembly.

[0033] The outer circumferential surface of the straight cylinder section two 2 is provided with a wheel installation web plate 8, the wheel installation web plate 8 is provided with a wheel installation hole 13, the side edge of the straight cylinder section two 2 is provided with a water throwing circular ring 9, water drops splashed from the bottom of a vehicle by centrifugal force generated by rotation of the output shaft can be effectively thrown away, external water drops can be prevented from entering the inside of the gearbox through the labyrinth gap, and phenomena such as emulsification of lubricating oil are caused. The end of the straight cylinder section two 2 is provided with a first shaft bridge 24 labyrinth seal structure.

[0034] Embodiment 2

[0035] The embodiment provides a low-floor gearbox output shaft, which comprises a hollow output shaft body. The output shaft body is provided with a through cavity, and the cavity is provided with a shaft bridge labyrinth seal structure and a shaft bridge tapered roller bearing. The inner wall of the cavity comprises a first shaft bridge labyrinth seal structure mounting shaft section 14, a shaft bridge tapered roller bearing mounting shaft section and a shaft bridge mounting shaft section 16.

[0036] The end of the output shaft body is provided with a brake disc mounting hole 10. The output shaft body is provided with a gearbox labyrinth seal structure, a gearbox and a driven gear 19. The outer circumferential surface of the output shaft body comprises a first gearbox labyrinth seal structure mounting shaft section 3, a gearbox supporting tapered roller bearing one mounting shaft section 4, a driven gear mounting shaft section 5, a gearbox supporting tapered roller bearing two mounting shaft section 6, a second gearbox labyrinth seal structure mounting shaft section 7 and a wheel mounting web 8 in sequence.

[0037] The driven gear 19 positioning tapered roller bearing mounting shaft section is provided with an oil injection hole 11 and an arc-shaped groove 12, and the oil injection hole 11 and the arc-shaped groove 12 are communicated, which facilitates the oil injection and disassembly of the driven gear 19.

[0038] The shaft shoulder is arranged between the gearbox supporting tapered roller bearing one mounting shaft section 4, the driven gear mounting shaft section 5, the gearbox supporting tapered roller bearing two mounting shaft section 6 and the second gearbox labyrinth seal structure mounting shaft section 7, and the height of the shaft shoulder is lower than the inner ring height of the tapered roller bearing at the shaft section, which facilitates the disassembly.

[0039] The wheel mounting web 8 is provided with a wheel mounting hole 13, and the side edge of the straight cylinder section two 2 is provided with a water throwing ring 9, which can effectively throw away the water droplets splashed from the bottom of the vehicle by the centrifugal force generated by the rotation of the output shaft, prevent the external water droplets from entering the gearbox through the labyrinth gap, and cause the phenomenon of emulsification of lubricating oil. The end of the straight cylinder section two 2 is provided with a first shaft bridge 24 labyrinth seal structure.

[0040] Embodiment 3

[0041] The embodiment provides a low-floor gearbox output shaft connecting mechanism, which comprises a gearbox, the output shaft body in the above embodiment, a driven gear 19 and a shaft bridge 24. The brake disc is connected with the brake disc mounting hole 10 of the output shaft body and fixed at the end. The other end is connected with a wheel 18. The gearbox is mounted on the outer circumferential surface of the output shaft body through supporting tapered roller bearings. The driven gear 19 is mounted on the outer circumferential surface of the output shaft body. The shaft bridge 24 is mounted in the cavity of the output shaft body through the shaft bridge 24 bearing. Specifically, the driven gear 19 is mounted on the driven gear mounting shaft section 5 of the output shaft body through interference coupling. The gearbox is mounted on the gearbox supporting tapered roller bearing one mounting shaft section 4 and the gearbox supporting tapered roller bearing two mounting shaft section 6 of the output shaft body through two supporting tapered roller bearings.

[0042] The shaft bridge 24 is provided with a slope, the end of the shaft bridge 24 is small in diameter, the shaft bridge 24 is installed in the cavity of the output shaft body, the internal first shaft bridge labyrinth sealing structure of the end of the output shaft body is provided with the shaft bridge 24 labyrinth sealing structure, the end of the shaft bridge 24 is installed in the shaft bridge tapered roller bearing one installation shaft section 15 through the shaft bridge tapered roller bearing one 22, the shaft bridge 24 is installed in the shaft bridge tapered roller bearing two installation shaft section 17 through the shaft bridge tapered roller bearing two 23, the end of the end of the output shaft body is provided with the first shaft bridge 24 labyrinth sealing structure, and the lubricating chamber of the shaft bridge 24 tapered roller bearing is formed, and the lubrication of the shaft bridge 24 tapered roller bearing is guaranteed.

[0043] The gear box is provided with a gear box labyrinth sealing structure on both sides, the gear box labyrinth sealing structure and the shaft bridge 24 labyrinth sealing structure both include a labyrinth ring and a labyrinth cover, the labyrinth ring of the gear box is connected with the outer circumferential surface of the output shaft body in an interference fit, the labyrinth ring and the labyrinth cover jointly constitute the sealing structure of the gear box output shaft body, and the lubricating oil of the lubricating bearing is prevented from leaking to the outside of the gear box. Similarly, the internal cavity of the output shaft body is provided with corresponding structure labyrinth ring and labyrinth cover for installing the shaft bridge 24 labyrinth sealing structure, and the lubricating oil of the lubricating bearing is prevented from leaking to the outside of the shaft bridge 24.

[0044] Obviously, the above embodiments of the utility model are only examples for clearly illustrating the utility model, and are not the limitation of the embodiments of the utility model. For ordinary skilled in the art, on the basis of the above description, other different forms of changes or changes can be made. Here, all the embodiments are not enumerated. Any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A low floor gear box output shaft characterized by, The hollow output shaft body comprises a connected straight cylinder section one and a straight cylinder section two, the straight cylinder section one is provided with a brake disc mounting position at the end, the outer circumferential surface of the straight cylinder section one is provided with a plurality of bearing mounting positions, the outer circumferential surface of the straight cylinder section two is provided with a wheel mounting web, and the wheel mounting web is provided with a wheel mounting hole; the output shaft body is a cavity structure, and the cavity is provided with a shaft bridge mounting surface and a shaft bridge bearing mounting surface.

2. The low floor gear box output shaft of claim 1, wherein, The bearing mounting positions comprise a gearbox bearing mounting position and a driven gear mounting position.

3. The low floor gear box output shaft of claim 1, wherein, The shaft shoulder height of the bearing mounting position is lower than the inner ring height of the tapered roller bearing.

4. The low floor gear box output shaft of claim 1, wherein, The outer circumferential surface of the straight cylinder section one is provided with an oil injection hole and an arc-shaped groove, and the oil injection hole and the arc-shaped groove are communicated.

5. The low floor gear box output shaft of claim 1, wherein, The cavity of the output shaft body comprises a horn-shaped shaft bridge mounting slope, and the shaft bridge mounting slope is provided with a shaft bridge bearing mounting surface on both sides.

6. The low floor gear box output shaft of claim 1, wherein, The shaft shoulder of the inner wall bearing mounting surface of the straight cylinder section two is provided with a notch.

7. The low floor gear box output shaft of claim 1, wherein, The straight cylinder section two of the output shaft body is provided with a water throwing ring.

8. The low floor gear box output shaft of claim 1, wherein, The diameter of the outer circumferential surface of the straight cylinder section one is smaller than the diameter of the outer circumferential surface of the straight cylinder section two.

9. A low floor gearbox output shaft connection mechanism characterized by, The low-floor gearbox output shaft comprises a gearbox, a driven gear and a shaft bridge, one end of the output shaft body is connected with a brake disc, the other end is connected with a wheel, the gearbox is installed on the outer circumferential surface of the output shaft body through a supporting tapered roller bearing, the driven gear is installed on the outer circumferential surface of the output shaft body through interference connection, and the shaft bridge is installed in the cavity of the output shaft body through a shaft bridge bearing.

10. The low floor gearbox output shaft connection mechanism of claim 9, wherein, The gearbox is provided with a gearbox labyrinth seal structure on both sides, and the cavity of the output shaft body is provided with a shaft bridge labyrinth seal structure.

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