CN109185406B - Single rear wheel direct drive transmission - Google Patents

Single rear wheel direct drive transmission Download PDF

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Publication number
CN109185406B
CN109185406B CN201811351999.9A CN201811351999A CN109185406B CN 109185406 B CN109185406 B CN 109185406B CN 201811351999 A CN201811351999 A CN 201811351999A CN 109185406 B CN109185406 B CN 109185406B
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China
Prior art keywords
bearing
hub
pawl
ring
abutted against
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CN201811351999.9A
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Chinese (zh)
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CN109185406A (en
Inventor
黄英可
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Zhangjiagang Chuansuo Vehicle Industry Co Ltd
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Zhangjiagang Chuansuo Vehicle Industry Co Ltd
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Priority to CN201811351999.9A priority Critical patent/CN109185406B/en
Publication of CN109185406A publication Critical patent/CN109185406A/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H3/00—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion
    • F16H3/44—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion using gears having orbital motion
    • F16H3/70—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion using gears having orbital motion in which the central axis of the gearing lies inside the periphery of an orbital gear
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/021—Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/023—Mounting or installation of gears or shafts in the gearboxes, e.g. methods or means for assembly
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/08—General details of gearing of gearings with members having orbital motion
    • F16H57/082—Planet carriers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
    • F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
    • F16H63/30—Constructional features of the final output mechanisms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/08—General details of gearing of gearings with members having orbital motion
    • F16H2057/085—Bearings for orbital gears

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structure Of Transmissions (AREA)
  • Retarders (AREA)

Abstract

The invention discloses a single rear wheel direct drive transmission, which comprises: the novel planetary transmission comprises a central shaft, a power input part, a hub, a gear shifting mechanism and at least one planetary transmission, wherein each planetary transmission comprises a planet carrier, a central wheel, a planet wheel and a gear ring, one end of each hub is provided with a first hub cover, the other end of each hub is provided with a second hub cover, each first hub cover and each second hub cover are fixedly connected with the hub, a first bearing is arranged between each first hub cover and the central shaft, at least one second bearing is arranged between each central shaft and each gear ring or between each planet carrier, a third bearing is arranged between each second hub cover and each gear ring or between each planet carrier, rated load of each first bearing is larger than that of each second bearing, and two sides of an inner ring and an outer ring of each first bearing are abutted against adjacent parts, so that the service life of each bearing is greatly prolonged.

Description

Single rear wheel direct drive transmission
[ field of technology ]
The invention relates to the technical field of bicycles, in particular to a single rear wheel direct-drive transmission.
[ background Art ]
Single rear wheel direct drive transmissions generally include: the power input part is fixedly connected with a gear ring or a planet carrier of the planetary transmission, power is input by the power input part and then is finally transmitted to the hub through the transmission of the planetary transmission, and the power is output by the hub.
In the prior art, the first bearing, the second bearing and the third bearing of the single rear wheel direct drive transmission have the same size, and the two sides of the inner ring and the outer ring of the first bearing, the second bearing and the third bearing are abutted against adjacent parts, so that the structure has the defects that: 1. when the transmission works, the first bearing, the second bearing and the third bearing are subjected to axial force at the same time, and the first bearing, the second bearing and the third bearing are easy to damage, so that the service life is influenced; 2. the overall size of the transmission is large and the structure is not compact enough.
Accordingly, there is a need to provide a single rear wheel direct drive transmission that solves the above-mentioned problems.
[ invention ]
In order to solve the technical problems, the invention aims to provide a single rear wheel direct-drive transmission capable of prolonging the service life of a bearing.
The technical scheme adopted by the invention is as follows: a single rear wheel direct drive transmission comprising: the novel planetary transmission comprises a central shaft, a power input piece, a hub, a gear shifting mechanism and at least one planetary transmission, wherein the gear shifting mechanism and the at least one planetary transmission are arranged between the central shaft and the hub, each planetary transmission comprises a planet carrier, a central wheel, a planet wheel and a gear ring, a first hub cover is arranged at one end of the hub, a second hub cover is arranged at the other end of the hub, the first hub cover and the second hub cover are fixedly connected with the hub or are integrally formed with the hub, one of the first hub cover and the second hub cover is fixedly connected with the hub, a first bearing is arranged between the first hub cover and the central shaft, at least one second bearing is arranged between the central shaft and the gear ring or the planet carrier, a deep groove ball bearing is arranged between the second hub cover and the gear ring or the planet carrier, rated load of the first bearing is larger than that of the second bearing, and both sides of the inner ring and the outer ring of the first bearing are abutted against adjacent parts.
Preferably, a single rear wheel direct drive transmission in the present invention is further provided with: in the two bearings, a gap is arranged between two sides of an inner ring of at least one bearing and adjacent parts, or a gap is arranged between two sides of an outer ring of at least one bearing and adjacent parts, or a gap is arranged between the inner ring and the outer ring of one side of at least one bearing and adjacent parts, or a gap is arranged between the left side of the inner ring of the second bearing and the right side of the inner ring of the third bearing and adjacent parts, or a gap is arranged between the left side of the outer ring of the second bearing and the right side of the outer ring of the third bearing and adjacent parts.
Preferably, a single rear wheel direct drive transmission in the present invention is further provided with: the one end of center pin is equipped with first screw thread section, the other end of center pin is equipped with the second screw thread section, the both ends of center pin are equipped with respectively with first screw thread section matched with first nut and with second screw thread section matched with second nut.
Preferably, a single rear wheel direct drive transmission in the present invention is further provided with: the number of the planetary transmissions is one, and the power input member is connected with a ring gear or a planet carrier of the planetary transmission.
Preferably, a single rear wheel direct drive transmission in the present invention is further provided with: the gear shift mechanism includes: the centrifugal pawl is arranged in the hub and is integrally formed or fixedly connected with the hub, the centrifugal pawl is arranged on the pawl frame through a pin, the ratchet wheel is arranged on the outer circumferential surface of the gear ring, an overrunning clutch is arranged between the planet carrier and the hub, the overrunning clutch comprises an overrunning clutch pawl and an overrunning clutch ratchet wheel, the overrunning clutch pawl is elastically arranged on the planet carrier, the overrunning clutch ratchet wheel is arranged in the hub and is integrally formed or fixedly connected with the hub, one side of an inner ring of the first bearing is abutted against a first nut, the other side of the inner ring of the first bearing is abutted against a step portion of the central shaft, the other side of the outer ring of the first bearing is abutted against the overrunning clutch ratchet wheel, one side of the inner ring of the second bearing is abutted against a step portion of the central shaft, the other side of the inner ring of the second bearing is abutted against a second nut, a gap is arranged between the side of the second bearing and the end face of the gear ring, one side of the first bearing is abutted against the inner ring of the second bearing, and a gap is arranged between the inner ring of the second bearing and the end face of the second bearing.
Preferably, a single rear wheel direct drive transmission in the present invention is further provided with: the gear shift mechanism includes: the novel planetary gear set comprises a pawl carrier, a pawl, a first ratchet wheel, a second ratchet wheel and an elastic piece for controlling the initial position of the pawl, wherein the pawl carrier is arranged between a hub and a planetary transmission, a radial positioning axial movable connection is formed between the pawl carrier and the hub, the pawl is arranged on the pawl carrier through a pin, the first ratchet wheel is arranged on the outer circumferential surface of a gear ring, the second ratchet wheel is arranged on the outer circumferential surface of the planetary carrier, one side of an inner ring of a first bearing is abutted against a first nut, the other side of the inner ring of the first bearing is abutted against a step part of a central shaft, one side of an outer ring of the first bearing is abutted against a first hub cover, one side of an inner ring of the second bearing is abutted against a step part of the central shaft, the other side of the inner ring of the second bearing is abutted against a second nut, and one side of an inner ring of the third bearing is abutted against the gear ring.
Preferably, a single rear wheel direct drive transmission in the present invention is further provided with: the number of the planetary transmissions is two, the planetary transmissions comprise a first planetary transmission and a second planetary transmission, and the first planetary transmission comprises: the first planetary transmission comprises a first planet carrier, a first central wheel, first planet gears and a first gear ring, wherein the second planetary transmission comprises: the first planet carrier and the second gear ring form an assembly, and one of the first gear ring, the second gear ring, the first planet carrier and the second planet carrier is connected with the power input piece.
Preferably, a single rear wheel direct drive transmission in the present invention is further provided with: the gear shift mechanism includes: the novel centrifugal ratchet comprises a pawl rack, a first centrifugal pawl, a second centrifugal pawl, a first ratchet wheel, a second ratchet wheel and a plurality of elastic pieces used for controlling the initial positions of the first centrifugal pawl and the second centrifugal pawl, wherein the pawl rack is arranged in a hub and is integrally or fixedly connected with the hub, the first centrifugal pawl and the second centrifugal pawl are all arranged on the pawl rack through pins, the first ratchet wheel is arranged on the outer circumferential surface of a first gear ring, the second ratchet wheel is arranged on an assembly, an overrunning clutch is arranged between the second planet carrier and the hub, the overrunning clutch comprises an overrunning clutch pawl and an overrunning clutch ratchet wheel, the overrunning clutch pawl is arranged on the second planet carrier, the overrunning clutch ratchet wheel is fixedly connected with the hub or is integrally formed, one side of an inner ring of the first bearing is abutted against a first nut, the other side of the inner ring of the first bearing is abutted against the step portion of an outer ring of the central shaft, the other side of the first bearing is abutted against the step portion of the first wheel cover, the other side of the first bearing is abutted against the step portion of the central shaft, the overrunning clutch pawl is abutted against one side of the inner ring of the second bearing, and the first side of the overrunning clutch is abutted against the inner ring of the first bearing.
Preferably, a single rear wheel direct drive transmission in the present invention is further provided with: the number of the second bearings is two, the two second bearings are arranged side by side, and a spacer bush is arranged between the two second bearings.
Compared with the prior art, the invention has the following beneficial effects: according to the invention, the rated load of the first bearing is larger than that of the second bearing, and the two sides of the inner ring and the outer ring of the first bearing are abutted against adjacent parts, so that most of the axial force is borne by the first bearing with larger rated load and the small part or not borne by the second bearing and the third bearing with smaller rated load when the transmission works, and the advantages of the arrangement are that: 1. the rated load of the second bearing and the third bearing is small, so that the size of the second bearing and the third bearing is also small, and the structural compactness of the transmission is ensured; 2. the service lives of the second bearing and the third bearing are prolonged.
[ description of the drawings ]
Fig. 1 is a schematic structural view of a single rear wheel direct drive transmission in embodiment 1 of the present invention.
Fig. 2 is a schematic cross-sectional structure of a single rear wheel direct drive transmission in embodiment 1 of the present invention.
Fig. 3 is an exploded view of the single rear wheel direct drive transmission in embodiment 1 of the present invention.
Fig. 4 is a schematic cross-sectional structure of a single rear wheel direct drive transmission in embodiment 2 of the present invention.
Fig. 5 is a schematic cross-sectional structure of a single rear wheel direct drive transmission in embodiment 3 of the present invention.
In the figure: 1. the center shaft, 10, the first thread segments, 11, the second thread segments, 14, the first bearing, 15, the second bearing, 16, the spacer, 17, the third bearing, 2, the power input, 3, the hub, 30, the first hub cap, 31, the second hub cap, 4, the shift mechanism, 40, the pawl carrier, 41, the first centrifugal pawl, 42, the second centrifugal pawl, 43, the first ratchet, 44, the second ratchet, 45, the elastic member, 46, the centrifugal pawl, 47, the ratchet, 48, the pawl, 5, the first planetary transmission, 50, the first carrier, 51, the first center wheel, 52, the first planetary gear, 53, the first ring gear, 6, the second planetary transmission, 60, the second carrier, 61, the second center wheel, 62, the second planetary gear, 63, the second ring gear, 7, the assembly, 8, the overrunning clutch, 80, the overrunning clutch pawl, 81, the overrunning clutch ratchet, 9, the planetary transmission, 90, the center wheel, 91, the planetary carrier, 92, 93, the planetary gear ring gear.
[ detailed description ] of the invention
A single rear wheel direct drive transmission according to the present invention will be described in further detail by way of specific embodiments.
Example 1
Referring to fig. 1 to 3, a single rear wheel direct drive transmission includes: the power transmission device comprises a central shaft 1, a power input member 2, a hub 3, a gear shifting mechanism 4 arranged between the central shaft 1 and the hub 3, a first planetary transmission 5 and a second planetary transmission 6, wherein the central shaft 1 is fixed with a frame.
The first planetary transmission 5 includes: the second planetary transmission 6 includes: the first planet carrier 50 and the second ring gear 63 form an assembly 7, a second planet carrier 60, a second sun gear 61, second planet gears 62 and a second ring gear 63.
The shift mechanism 4 includes: the novel centrifugal pawl device comprises a pawl holder 40, a first centrifugal pawl 41, a second centrifugal pawl 42, a first ratchet wheel 43, a second ratchet wheel 44 and a plurality of elastic pieces 45 for controlling initial positions of the first centrifugal pawl 41 and the second centrifugal pawl 42, wherein the pawl holder 40 is arranged in a hub 3 and is integrally formed with the hub 3, the first centrifugal pawl 41 and the second centrifugal pawl 42 are all arranged on the pawl holder 40 through pins, the first ratchet wheel 43 is arranged on the outer circumferential surface of a first gear ring 53, the second ratchet wheel 44 is arranged on the outer circumferential surface of the combined part 7, an overrunning clutch 8 is arranged between the second planet carrier 60 and the hub 3, the overrunning clutch 8 comprises an overrunning clutch pawl 80 and an overrunning clutch ratchet 81, the overrunning clutch pawl 80 is arranged on the second planet carrier 60, and the overrunning clutch ratchet 81 is fixedly connected with the hub 3.
One end of the central shaft 1 is provided with a first threaded section 10, the other end of the central shaft 1 is provided with a second threaded section 11, and both ends of the central shaft 1 are respectively provided with a first nut (not shown) matched with the first threaded section 10 and a second nut (not shown) matched with the second threaded section 11. One end of the hub 3 is provided with a first hub cover 30, the other end of the hub 3 is provided with a second hub cover 31, the first hub cover 30 and the second hub cover 31 are fixedly connected with the hub 3, a first bearing 14 is arranged between the first hub cover 30 and the central shaft 1, two side-by-side second bearings 15 are arranged between the central shaft 1 and the first gear ring 53, and a spacer 16 is arranged between the two second bearings 15. The second hub cap 31 and the first gear ring 53 are provided with a third bearing 17 therebetween, the first bearing 14, the second bearing 15 and the third bearing 17 are deep groove ball bearings, the rated load of the first bearing 14 is larger than the rated load of the second bearing 15, one side of the inner ring of the first bearing 14 is abutted against the first nut, the other side of the inner ring of the first bearing 14 is abutted against the step portion of the central shaft 1, one side of the outer ring of the first bearing 14 is abutted against the step portion of the first hub cap 30, the other side of the outer ring of the first bearing 14 is abutted against the overrunning clutch ratchet 81, one side of the inner ring of the second bearing 15 at the left side is abutted against the step portion of the central shaft, the other side of the inner ring of the second bearing 15 at the right side is abutted against the spacer 16, one side of the inner ring of the second bearing 15 at the left side is abutted against the second nut, a gap is provided between the outer ring side of the second bearing 15 at the left side and the third bearing 50, a gap is provided between the outer ring of the second bearing 15 at the right side of the second bearing 15 and the third bearing 17, the second bearing 17 is provided with a smaller axial force than the first axial force is borne by the first bearing cap 17, the other side of the inner ring cap is provided with a smaller axial force than the second bearing 31, the gap is provided between the inner side of the second bearing 17 is provided with a smaller axial force is borne by the second bearing end face of the second bearing cap, the second bearing 31, the gap is provided between the inner side of the second bearing 31 is provided with the second bearing 31, and the inner bearing 31 is provided with the axial force is larger force is borne, and the bearing 31 is borne by the bearing 31, thereby protecting the second bearing 15 and the third bearing 17 and prolonging the service lives of the second bearing 15 and the third bearing 17.
In the present embodiment, the power input member 2 is connected to the first ring gear 53, so that the second bearing is disposed between the first ring gear 53 and the center shaft 1, and the third bearing is disposed between the first ring gear 53 and the second hub cap 31, however, in other embodiments, the power input member 2 may be connected to the second ring gear 63 or the first carrier 50 or the second carrier 60, the second bearing may be disposed between the second ring gear 63 and the center shaft 1, or between the first carrier 50 and the center shaft 1, or between the second carrier 60 and the center shaft 1, and the third bearing 17 may be disposed between the second ring gear 63 and the first hub cap 30, or between the first carrier 50 and the second hub cap 31, or between the second carrier 60 and the first hub cap 30, and the present invention may be implemented.
The working principle of the single rear wheel direct drive transmission in the embodiment is as follows: in the low gear, the first centrifugal pawl 41, the second centrifugal pawl 42, the first ratchet wheel 43 and the second ratchet wheel 44 are all in a disengaged state, power is input by the power input part 2, the power input part 2 is connected with the first gear ring 53, so that the first gear ring 53 is driven to rotate, the first gear ring 53 drives the first planet carrier 50 to rotate through the transmission of the first planet gears 52, the first planet carrier 50 and the second gear ring 63 are integrally formed to form the assembly 7, so that the second gear ring 63 rotates, and then the second planet carrier 60 is driven to rotate through the transmission of the second planet gears 62, and the overrunning clutch 8 arranged between the second planet carrier 60 and the hub 3 is always in an engaged state, so that the hub 3 is driven to rotate and the hub 3 is driven to output power; in the middle speed gear, the first centrifugal pawl 41 is in a disengaged state with the first ratchet wheel 43, the second centrifugal pawl 42 is in an engaged state with the second ratchet wheel 44, power is input by the power input part 2, the power input part 2 is connected with the first gear ring 53, the first gear ring 53 is driven to rotate, the first gear ring 53 drives the first planet carrier 50 to rotate through the transmission of the first planet gears 52, the first planet carrier 50 and the second gear ring 63 are integrally formed to form the assembly 7, the second gear ring 63 rotates, the second ratchet wheel 44 arranged on the second gear ring 63 is meshed with the second centrifugal pawl 42 arranged on the pawl carrier 40, the pawl carrier 40 is integrally formed with the hub 3, the hub 3 is driven to rotate and power is output by the hub 3, and in the middle speed gear, the second planet carrier 60 is in a follow-up state. In the high gear, the first centrifugal pawl 41 is engaged with the first ratchet wheel 43, the second centrifugal pawl 42 is engaged with the second ratchet wheel 44, power is input by the power input member 2, the power input member 2 is connected with the first gear ring 53, the first gear ring 53 rotates, the first ratchet wheel 43 arranged on the first gear ring 53 is engaged with the first centrifugal pawl 41 arranged on the pawl rest 40, the pawl rest 40 is integrally formed with the hub 3, the hub 3 is driven to rotate, power is output by the hub 3, and in the high gear, the first planet carrier 50 and the second planet carrier 60 are in the following state.
Example 2
Referring to fig. 4, a single rear wheel direct drive transmission includes: the central shaft 1, the power input piece 2, the hub 3, a gear shifting mechanism 4 and a planetary transmission 9, wherein the gear shifting mechanism 4 and the planetary transmission 9 are arranged between the central shaft 1 and the hub 3, the central shaft 1 is fixed with a frame, and the planetary transmission 9 comprises a planet carrier 90, a central wheel 91, planet gears 92 and a gear ring 93.
The shift mechanism 4 includes: the centrifugal pawl 46 is arranged in the hub 3 and is integrally formed with the hub 3, the centrifugal pawl 46 is arranged on the pawl holder 40 through a pin, the ratchet 47 is arranged on the outer circumferential surface of the gear ring 93, an overrunning clutch 8 is arranged between the planet carrier 90 and the hub 3, the overrunning clutch 8 comprises an overrunning clutch pawl 80 and an overrunning clutch ratchet 81, the overrunning clutch pawl 80 is elastically arranged on the planet carrier 90, and the overrunning clutch ratchet 81 is arranged in the hub 3 and is fixedly connected with the hub 3.
One end of the central shaft 1 is provided with a first threaded section 10, the other end of the central shaft 1 is provided with a second threaded section 11, and both ends of the central shaft 1 are respectively provided with a first nut (not shown) matched with the first threaded section 10 and a second nut (not shown) matched with the second threaded section 11.
The first hub cover 30 is arranged at one end of the hub 3, the second hub cover 31 is arranged at the other end of the hub 3, the first hub cover 30 and the second hub cover 31 are fixedly connected with the hub 3, a first bearing 14 is arranged between the first hub cover 30 and the central shaft 1, two side by side second bearings 15 are arranged between the central shaft 1 and the gear ring 93, a spacer bush 16 is arranged between the two second bearings 15, a third bearing 17 is arranged between the second hub cover 31 and the gear ring 93, the first bearing 14, the second bearing 15 and the third bearing 17 are deep groove ball bearings, the rated load of the first bearing 14 is larger than the rated load of the second bearing 15, one side of the inner ring of the first bearing 14 is abutted against the first nut, the other side of the inner ring of the first bearing 14 is abutted against the step part of the central shaft 1, the outer ring side of the first bearing 14 is abutted against the step part in the hub 3, the other side of the outer ring of the first bearing 14 is abutted against the overrunning clutch ratchet 81, the inner ring side of the second bearing 15 positioned at the left side is abutted against the step part of the central shaft 1, the other side of the inner ring of the second bearing 15 positioned at the left side is abutted against the spacer 16, the inner ring side of the second bearing 15 positioned at the right side is abutted against the spacer 16, the other side of the inner ring of the second bearing 15 positioned at the right side is abutted against the second nut, a gap is arranged between the outer ring side of the second bearing 15 positioned at the left side and the planet carrier 90, a gap is arranged between the outer ring side of the second bearing 15 positioned at the right side and the end face of the gear ring 93, one side of the inner ring of the third bearing 17 is abutted against the gear ring 93, a gap is arranged between the other side of the inner ring of the third bearing 17 and the end face of the second hub cover 31, one side of the outer ring of the third bearing 17 is a cavity, and a gap is provided between the other side of the outer ring of the third bearing 17 and the end face of the second hub cap 31.
In the present embodiment, the power input member 2 is connected to the ring gear 93, so that the second bearing 15 is disposed between the ring gear 93 and the center shaft 1, and the third bearing 17 is disposed between the ring gear 93 and the second hub cap 31, however, in other embodiments, the power input member 2 may be connected to the carrier 90, the second bearing 15 may be disposed between the carrier 90 and the center shaft 1, and the third bearing 17 may be disposed between the carrier 90 and the second hub cap 31, as well as the present invention may be implemented.
The working principle of the single rear wheel direct drive transmission in the embodiment is as follows: in the low gear, the centrifugal pawl 46 and the ratchet 47 are in a disengaged state, power is input by the power input member 2, the power input member 2 is connected with the gear ring 93, so that the gear ring 93 rotates, the planet carrier 90 is driven to rotate through the transmission of the planet gears 92, and the overrunning clutch ratchet 81 arranged on the planet carrier 90 is meshed with the overrunning clutch pawl 80 arranged in the hub 3, so that the hub 3 is driven to rotate and the power is output by the hub 3; in the high gear, the centrifugal pawl 46 is engaged with the ratchet wheel 47, power is input from the power input member 2, the power input member 2 is connected with the gear ring 93, the gear ring 93 rotates, and the ratchet wheel 47 provided on the gear ring 93 and the centrifugal pawl 46 provided in the hub 3 are engaged with each other, so that the hub 3 is driven to rotate, and in the high gear, the carrier 90 is in the following state.
Example 3
Referring to fig. 5, a single rear wheel direct drive transmission includes: the central shaft 1, the power input piece 2, the hub 3, a gear shifting mechanism 4 and a planetary transmission 9, wherein the gear shifting mechanism 4 and the planetary transmission 9 are arranged between the central shaft 1 and the hub 3, the central shaft 1 is fixed with a frame, and the planetary transmission 9 comprises a planet carrier 90, a central wheel 91, planet gears 92 and a gear ring 93.
The shift mechanism 4 includes: the pawl holder 40, the pawl 48, the first ratchet wheel 43 and the second ratchet wheel 44 and an elastic member (not shown) for controlling the initial position of the pawl 48, the pawl holder 40 being arranged between the hub 3 and the planetary transmission 9, the pawl holder 40 and the hub 3 forming a radially positioned axially movable connection, the pawl 48 being pin-mounted on the pawl holder 40, the first ratchet wheel 43 being arranged on the outer circumferential surface of the ring gear 93 and the second ratchet wheel 44 being arranged on the outer circumferential surface of the planet carrier 90.
One end of the central shaft 1 is provided with a first threaded section 10, the other end of the central shaft 1 is provided with a second threaded section 11, and both ends of the central shaft 1 are respectively provided with a first nut (not shown) matched with the first threaded section 10 and a second nut (not shown) matched with the second threaded section 11.
The first hub cover 30 is arranged at one end of the hub 3, the second hub cover 31 is arranged at the other end of the hub 3, the first hub cover 30 and the second hub cover 31 are fixedly connected with the hub 3, a first bearing 14 is arranged between the first hub cover 30 and the central shaft 1, two side by side second bearings 15 are arranged between the central shaft 1 and the gear ring 93, a spacer bush 16 is arranged between the two second bearings 15, a third bearing 17 is arranged between the second hub cover 31 and the gear ring 93, the first bearing 14, the second bearing 15 and the third bearing 17 are deep groove ball bearings, the rated load of the first bearing 14 is larger than the rated load of the second bearing 15, one side of the inner ring of the first bearing 14 is abutted against the first nut, the other side of the inner ring of the first bearing 14 is abutted against the step part of the central shaft 1, the outer ring side of the first bearing 14 is abutted against the first hub cap 30, the other side of the outer ring of the first bearing 14 is abutted against the end face in the hub 3, the inner ring side of the second bearing 15 positioned at the left side is abutted against the step portion of the central shaft 1, the other side of the inner ring of the second bearing 15 positioned at the left side is abutted against the spacer, the inner ring side of the second bearing 15 positioned at the right side is abutted against the spacer 16, the other side of the inner ring of the second bearing 15 positioned at the right side is abutted against the second nut, a gap is provided between the outer ring side of the second bearing 15 positioned at the left side and the planet carrier 90, a gap is provided between the outer ring side of the second bearing 15 positioned at the right side and the end face of the ring gear 93, one side of the inner ring of the third bearing 17 is abutted against the ring gear 93, a gap is provided between the other side of the inner ring of the third bearing 17 and the end face of the second hub cap 31, one side of the outer ring of the third bearing 17 is a cavity, and a gap is provided between the other side of the outer ring of the third bearing 17 and the end face of the second hub cap 31.
In the present embodiment, the power input member 2 is connected to the ring gear 93, so that the second bearing 15 is disposed between the ring gear 93 and the center shaft 1, and the third bearing 17 is disposed between the ring gear 93 and the second hub cap 31, however, in other embodiments, the power input member 2 may be connected to the carrier 90, the second bearing 15 may be disposed between the carrier 90 and the center shaft 1, and the third bearing 17 may be disposed between the carrier 90 and the second hub cap 31, as well as the present invention may be implemented.
The working principle of the single rear wheel direct drive transmission in the embodiment is as follows: in the low gear, the pawl 48 is disengaged from the first ratchet wheel 43 and engaged with the second ratchet wheel 44, power is input from the power input member 2, the power input member 2 is connected with the gear ring 93, the gear ring 93 rotates, the planet carrier 90 is driven to rotate by the transmission of the planet gears 92, the second ratchet wheel 44 arranged on the outer circumferential surface of the planet carrier 90 is engaged with the pawl, the pawl carrier 40 is positioned radially with the hub 3, the hub 3 is driven to rotate and output power by the hub 3, in the high gear, the pawl carrier 40 is moved axially, the pawl 48 on the pawl carrier 40 is disengaged from the second ratchet wheel 44 and engaged with the first ratchet wheel 43, power is input from the power input member 2, the power input member 2 is connected with the gear ring 93, the gear ring 93 rotates, and the first ratchet wheel 43 arranged on the outer circumferential surface of the gear ring 93 is engaged with the pawl 48, the pawl carrier 40 is positioned radially with the hub 3, and the hub 3 is driven to rotate and output power by the hub 3.
In summary, according to the present invention, since the rated load of the first bearing 14 is greater than the rated load of the second bearing 15, both sides of the inner ring and the outer ring of the first bearing 14 are abutted against adjacent components, so that most of the axial force is borne by the first bearing 14 with a larger rated load when the transmission works, and little or no load is borne by the second bearing 15 and the third bearing 17 with a smaller rated load, so that the service lives of the second bearing 15 and the third bearing 17 are prolonged while the compactness of the transmission is ensured.
The above-described embodiments are merely illustrative of the principles and functions of the present invention, and some of the practical examples, not intended to limit the invention; it should be noted that modifications and improvements can be made by those skilled in the art without departing from the inventive concept, and these are all within the scope of the present invention.

Claims (9)

1. A single rear wheel direct drive transmission comprising: the novel bicycle comprises a central shaft, a power input piece, a hub, a gear shifting mechanism and at least one planetary transmission, wherein the gear shifting mechanism and the at least one planetary transmission are arranged between the central shaft and the hub, the central shaft is fixed with a bicycle frame, each planetary transmission comprises a planet carrier, a central wheel, a planet wheel and a gear ring, a first hub cover is arranged at one end of the hub, a second hub cover is arranged at the other end of the hub, the first hub cover and the second hub cover are fixedly connected with the hub or are integrally formed with the first hub cover and the second hub cover, one of the first hub cover and the second hub cover is fixedly connected with the hub, a first bearing is arranged between the first hub cover and the central shaft, at least one second bearing is arranged between the central shaft and the gear ring or the planet carrier, and a third bearing is arranged between the second hub cover and the gear ring or the planet carrier, and the novel bicycle is characterized in that: the first bearing, the second bearing and the third bearing are deep groove ball bearings, the rated load of the first bearing is larger than that of the second bearing, and two sides of the inner ring and the outer ring of the first bearing are abutted against adjacent parts.
2. A single rear wheel direct drive transmission as defined in claim 1 wherein: in the two bearings, a gap is arranged between two sides of an inner ring of at least one bearing and adjacent parts, or a gap is arranged between two sides of an outer ring of at least one bearing and adjacent parts, or a gap is arranged between the inner ring and the outer ring of one side of at least one bearing and adjacent parts, or a gap is arranged between the left side of the inner ring of the second bearing and the right side of the inner ring of the third bearing and adjacent parts, or a gap is arranged between the left side of the outer ring of the second bearing and the right side of the outer ring of the third bearing and adjacent parts.
3. A single rear wheel direct drive transmission as defined in claim 1 wherein: the one end of center pin is equipped with first screw thread section, the other end of center pin is equipped with the second screw thread section, the both ends of center pin are equipped with respectively with first screw thread section matched with first nut and with second screw thread section matched with second nut.
4. A single rear wheel direct drive transmission as defined in claim 3 wherein: the number of the planetary transmissions is one, and the power input member is connected with a ring gear or a planet carrier of the planetary transmission.
5. A single rear wheel direct drive transmission as defined in claim 4 wherein: the gear shift mechanism includes: the centrifugal pawl is arranged in the hub and is integrally formed or fixedly connected with the hub, the centrifugal pawl is arranged on the pawl frame through a pin, the ratchet wheel is arranged on the outer circumferential surface of the gear ring, an overrunning clutch is arranged between the planet carrier and the hub, the overrunning clutch comprises an overrunning clutch pawl and an overrunning clutch ratchet wheel, the overrunning clutch pawl is elastically arranged on the planet carrier, the overrunning clutch ratchet wheel is arranged in the hub and is integrally formed or fixedly connected with the hub, one side of an inner ring of the first bearing is abutted against a first nut, the other side of the inner ring of the first bearing is abutted against a step portion of the central shaft, the other side of the outer ring of the first bearing is abutted against the overrunning clutch ratchet wheel, one side of the inner ring of the second bearing is abutted against a step portion of the central shaft, the other side of the inner ring of the second bearing is abutted against a second nut, a gap is arranged between the side of the second bearing and the end face of the gear ring, one side of the first bearing is abutted against the inner ring of the second bearing, and a gap is arranged between the inner ring of the second bearing and the end face of the second bearing.
6. A single rear wheel direct drive transmission as defined in claim 4 wherein: the gear shift mechanism includes: the novel planetary gear set comprises a pawl carrier, a pawl, a first ratchet wheel, a second ratchet wheel and an elastic piece for controlling the initial position of the pawl, wherein the pawl carrier is arranged between a hub and a planetary transmission, a radial positioning axial movable connection is formed between the pawl carrier and the hub, the pawl is arranged on the pawl carrier through a pin, the first ratchet wheel is arranged on the outer circumferential surface of a gear ring, the second ratchet wheel is arranged on the outer circumferential surface of the planetary carrier, one side of an inner ring of a first bearing is abutted against a first nut, the other side of the inner ring of the first bearing is abutted against a step part of a central shaft, one side of an outer ring of the first bearing is abutted against a first hub cover, one side of an inner ring of the second bearing is abutted against a step part of the central shaft, the other side of the inner ring of the second bearing is abutted against a second nut, and one side of an inner ring of the third bearing is abutted against the gear ring.
7. A single rear wheel direct drive transmission as defined in claim 3 wherein: the number of the planetary transmissions is two, the planetary transmissions comprise a first planetary transmission and a second planetary transmission, and the first planetary transmission comprises: the first planetary transmission comprises a first planet carrier, a first central wheel, first planet gears and a first gear ring, wherein the second planetary transmission comprises: the first planet carrier and the second gear ring form an assembly, and one of the first gear ring, the second gear ring, the first planet carrier and the second planet carrier is connected with the power input piece.
8. A single rear wheel direct drive transmission as defined in claim 7 wherein: the gear shift mechanism includes: the novel centrifugal ratchet comprises a pawl rack, a first centrifugal pawl, a second centrifugal pawl, a first ratchet wheel, a second ratchet wheel and a plurality of elastic pieces used for controlling the initial positions of the first centrifugal pawl and the second centrifugal pawl, wherein the pawl rack is arranged in a hub and is integrally or fixedly connected with the hub, the first centrifugal pawl and the second centrifugal pawl are all arranged on the pawl rack through pins, the first ratchet wheel is arranged on the outer circumferential surface of a first gear ring, the second ratchet wheel is arranged on an assembly, an overrunning clutch is arranged between the second planet carrier and the hub, the overrunning clutch comprises an overrunning clutch pawl and an overrunning clutch ratchet wheel, the overrunning clutch pawl is arranged on the second planet carrier, the overrunning clutch ratchet wheel is fixedly connected with the hub or is integrally formed, one side of an inner ring of the first bearing is abutted against a first nut, the other side of the inner ring of the first bearing is abutted against the step portion of an outer ring of the central shaft, the other side of the first bearing is abutted against the step portion of the first wheel cover, the other side of the first bearing is abutted against the step portion of the central shaft, the overrunning clutch pawl is abutted against one side of the inner ring of the second bearing, and the first side of the overrunning clutch is abutted against the inner ring of the first bearing.
9. A single rear wheel direct drive transmission as defined in claim 1 wherein: the number of the second bearings is two, the two second bearings are arranged side by side, and a spacer bush is arranged between the two second bearings.
CN201811351999.9A 2018-11-14 2018-11-14 Single rear wheel direct drive transmission Active CN109185406B (en)

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Application Number Priority Date Filing Date Title
CN201811351999.9A CN109185406B (en) 2018-11-14 2018-11-14 Single rear wheel direct drive transmission

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Application Number Priority Date Filing Date Title
CN201811351999.9A CN109185406B (en) 2018-11-14 2018-11-14 Single rear wheel direct drive transmission

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Publication Number Publication Date
CN109185406A CN109185406A (en) 2019-01-11
CN109185406B true CN109185406B (en) 2023-09-22

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB326660A (en) * 1929-03-07 1930-03-20 Coom Kittilsen Improvements relating to variable speed planetary gearing
US4706982A (en) * 1986-04-21 1987-11-17 Hartmann Dirck T Dual range planetary transmission for pedal powered vehicles
KR101089683B1 (en) * 2011-09-19 2011-12-05 주식회사 솔텍 The bicycle an accelerator
CN106494563A (en) * 2016-12-21 2017-03-15 张家港川梭车业有限公司 A kind of gear ring center wheel is fixed single-wheel and directly drives many gear fully-automatic gearboxs
CN106741562A (en) * 2017-01-20 2017-05-31 张家港川梭车业有限公司 A kind of straight line tramples single-wheel and directly drives gear ring center wheel fixed transmission
CN209012347U (en) * 2018-11-14 2019-06-21 张家港川梭车业有限公司 A kind of single rear wheel directly drives speed changer

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB326660A (en) * 1929-03-07 1930-03-20 Coom Kittilsen Improvements relating to variable speed planetary gearing
US4706982A (en) * 1986-04-21 1987-11-17 Hartmann Dirck T Dual range planetary transmission for pedal powered vehicles
KR101089683B1 (en) * 2011-09-19 2011-12-05 주식회사 솔텍 The bicycle an accelerator
CN106494563A (en) * 2016-12-21 2017-03-15 张家港川梭车业有限公司 A kind of gear ring center wheel is fixed single-wheel and directly drives many gear fully-automatic gearboxs
CN106741562A (en) * 2017-01-20 2017-05-31 张家港川梭车业有限公司 A kind of straight line tramples single-wheel and directly drives gear ring center wheel fixed transmission
CN209012347U (en) * 2018-11-14 2019-06-21 张家港川梭车业有限公司 A kind of single rear wheel directly drives speed changer

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