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CN-117212355-B - Planetary auxiliary box synchronizer structure

CN117212355BCN 117212355 BCN117212355 BCN 117212355BCN-117212355-B

Abstract

The application relates to a planetary auxiliary box synchronizer structure, which belongs to the technical field of vehicle transmission speed change and comprises a planetary gear train, a high-gear conical ring and a low-gear conical ring, wherein the planetary gear train comprises a planet carrier, a planet wheel arranged on the planet carrier, and a planet gear ring which is meshed with the planet wheel and can axially slide along the planet wheel, the high-gear conical ring is positioned at one end of the planet wheel and is connected with the planet carrier, and the low-gear conical ring is positioned at the other end of the planet wheel and is used for being connected with a shell. Therefore, the planetary gear ring has the function of the synchronizer sliding sleeve, reduces the parts such as the synchronizer gear sleeve, the supporting plate and the like, provides conditions for reducing the size of the planetary auxiliary box, can effectively reduce the assembly difficulty and cost, shortens the distance from the planetary gear ring to the low-gear conical ring and the shell fixed by the low-gear conical ring, shortens the length of a torque arm of force acted on the shell by the planetary gear ring when resisting, greatly reduces the reverse torque applied by the planetary gear ring to the shell with indirect connection relation, and achieves the aim of effectively avoiding the cracking of the shell.

Inventors

  • MIN YUNDONG
  • LI JIANPING
  • ZHONG DAWEI
  • HU TIANYU

Assignees

  • 东风商用车有限公司

Dates

Publication Date
20260512
Application Date
20230814

Claims (8)

  1. 1. A planetary auxiliary box synchronizer structure, comprising: The planetary gear train comprises a planet carrier (9), a planet wheel (8) arranged on the planet carrier (9) and a planet gear ring (7) which is meshed with the planet wheel (8) and can axially slide along the planet wheel (8); the high-gear cone ring (11) is positioned at one end of the planet wheel (8) and is connected with the planet carrier (9), and when the high-gear cone ring is in a high gear, the planet gear ring (7) is meshed with the high-gear cone ring (11) for transmission; the low-gear conical ring (5) is positioned at the other end of the planet wheel (8) and is used for being connected with the shell, and when the planetary gear is in a low gear, the planet gear ring (7) is meshed with the low-gear conical ring (5) for transmission; The shell comprises a middle shell (3) connected with the low-gear cone ring (5) and a rear shell (12) connected with the middle shell (3) and accommodating the high-gear cone ring (11); The planetary gear train also comprises a sun gear (13) meshed with the planet gear (8) and a hollow shaft (1) fixed with the sun gear (13), and lubricating oil ways which are communicated with each other and guide the hollow shaft (1) are arranged on the middle shell (3) and the low-gear cone ring (5); the middle shell (3) is rotationally connected with the hollow shaft (1) through a bearing (10), and the low-gear conical ring (5) is provided with a positioning surface for axially positioning the bearing (10).
  2. 2. The planetary sub-tank synchronizer structure as claimed in claim 1, wherein: The planetary gear ring (7) is respectively inserted with a synchronizing ring (6) at the positions corresponding to the high-gear conical ring (11) and the low-gear conical ring (5), an elastic structure pre-synchronizing assembly is arranged between the synchronizing ring (6) and the planetary gear ring (7), and a shifting fork groove (7 a) is formed in the outer ring of the planetary gear ring (7); both sides of the planet carrier (9) are provided with annular step grooves for axially limiting the synchronizing ring (6).
  3. 3. The planetary sub-tank synchronizer structure as claimed in claim 2, wherein: The two ends of the planetary gear ring (7) are respectively provided with a presynchronization groove along the inner circumference, the synchronizing ring (6) is provided with an annular groove (6 a) along the outer circumference, the presynchronization component is an elastic snap ring (15) arranged in the annular groove, and the elastic snap ring (15) is used for being clamped into the presynchronization grooves during movement so as to generate presynchronization friction torque; The pre-synchronization groove is formed by milling end parts through inner teeth (7 c) on the planetary gear ring (7), the pre-synchronization groove comprises a slope (7 b) positioned on the inner teeth (7 c) and a sliding surface connected with the slope (7 b), and a trapezoid end part (15 a) matched with the slope (7 b) and the sliding surface is arranged on the elastic snap ring (15).
  4. 4. A planetary secondary box synchronizer structure in accordance with claim 3, wherein: the inner circumference of the synchronizing ring (6) is provided with a plurality of oil holes (6 g) communicated with the annular groove (6 a), one end, close to the planet carrier (9), of the synchronizing ring (6) is provided with a plurality of end face grooves (6 f), and the oil holes (6 g) and the end face grooves (6 f) are distributed alternately.
  5. 5. The planetary sub-tank synchronizer structure as claimed in claim 1, wherein: And joint teeth (7 f) matched with the low-gear conical ring (5) and the high-gear conical ring (11) are arranged at two ends of the inner teeth (7 c) of the planetary gear ring (7), and the joint teeth (7 f) are formed by milling end parts through the inner teeth (7 c).
  6. 6. The planetary sub-tank synchronizer structure as claimed in claim 2, wherein: At least one positioning groove (7 g) is formed in the two axial ends of the planetary gear ring (7), and at least one first locking tooth (7 e) is formed in the two axial ends of the planetary gear ring (7); The synchronous ring (6) is provided with a positioning tooth (6 d) matched with the positioning groove (7 g) and a second locking tooth (6 e) matched with the first locking tooth (7 e), and the first locking tooth (7 e) can move relative to the second locking tooth (6 e).
  7. 7. The planetary sub-tank synchronizer structure as claimed in claim 6, wherein: The first locking teeth (7 e) are formed by milling end parts through inner teeth (7 c) on the planetary gear ring (7), and form locking areas with the end surfaces of the planetary gear ring (7); The second locking tooth (6 e) can be clamped into the locking area when being matched with the first locking tooth (7 e), and the second locking tooth (6 e) can be moved in the locking area.
  8. 8. The planetary sub-tank synchronizer structure as claimed in claim 6, wherein: the positioning groove (7 g) is formed by milling off the end part of the inner teeth (7 c) on the planetary gear ring (7); The joint surfaces of the first locking teeth (7 e) and the second locking teeth (6 e) along the axial direction of the planetary gear ring (7) are inclined surfaces.

Description

Planetary auxiliary box synchronizer structure Technical Field The application relates to the technical field of vehicle transmission speed change, in particular to a planet auxiliary box synchronizer structure. Background The gearbox is a gearbox that changes the gear ratio and the direction of movement. Between the clutch and the central transmission. The main functions are that the driving force and the running speed of the vehicle are changed (gear shifting) under the condition that the rotation speed and the torque of the engine are unchanged, the vehicle can run in a reverse direction (reversing), and the engine can stop without flameout (neutral gear). The existing heavy multi-gear gearbox generally adopts a main gearbox and NGW planetary auxiliary gearbox structure to realize multiplication of speed ratio. The planetary auxiliary box is provided with two gears, namely a low gear and a high gear, and the shift is realized by the synchronizer. The gear ring is jointed with the planet carrier in high gear, the speed ratio of the planetary auxiliary box is 1, and in low gear, the gear ring is fixed, and the power is output through the sun gear, the planet gear and the planet carrier. However, in the scheme of the existing planetary auxiliary box synchronizer, the synchronizer and the oil guide device are installed in series, the axial length is large, the weight is large, the tooth sleeve-gear ring and the low-gear conical ring-support plate-shell are complex in connection, the middle of the gear sleeve-gear ring and the low-gear conical ring-support plate-shell comprise a plurality of splines, clamping rings and bolts, the assembly difficulty is high, the cost is high, meanwhile, in the low gear, the gear ring is indirectly connected with the shell through the tooth sleeve, the low-gear conical ring and the support plate of the synchronizer to be fixed and not rotated, so that the length of a torque arm of force acted on the shell by the gear ring is large, the planetary gear train can apply great reverse torque to the shell with indirect connection relation, and the shell is easy to crack. Disclosure of Invention The embodiment of the application provides a planet auxiliary box synchronizer structure, which aims to solve the problems that in the prior art, the assembly difficulty of a planet auxiliary box is high, the cost is high, and a planet gear train can apply a large reverse torque to a shell connected with a supporting plate so as to easily cause the cracking of the shell. The embodiment of the application provides a planet auxiliary box synchronizer structure, which comprises the following components: the planetary gear train comprises a planet carrier, a planet wheel arranged on the planet carrier and a planet gear ring which is meshed with the planet wheel and can axially slide along the planet wheel; the high-gear conical ring is positioned at one end of the planet wheel and connected with the planet carrier, and when the planet wheel is in a high gear, the planet gear ring and the high-gear conical ring are in meshed transmission; and the low-gear cone ring is positioned at the other end of the planet wheel and is used for being connected with the shell, and when the planetary gear ring is in a low gear, the planetary gear ring is meshed with the low-gear cone ring for transmission. In some embodiments, the positions of the planetary gear ring corresponding to the high-gear conical ring and the low-gear conical ring are respectively inserted with a synchronizing ring, a pre-synchronizing assembly with an elastic structure is arranged between the synchronizing ring and the planetary gear ring, and the outer ring of the planetary gear ring is provided with a shifting fork groove; annular step grooves for axially limiting the synchronizing ring are formed in two sides of the planet carrier. In some embodiments, two ends of the planetary gear ring are respectively provided with a pre-synchronization groove along the inner circumference thereof, the synchronization ring is provided with an annular groove along the outer circumference thereof, the pre-synchronization component is an elastic snap ring arranged in the annular groove, and the elastic snap ring is used for being clamped into the pre-synchronization groove when moving so as to generate a pre-synchronization friction moment; the pre-common cloth groove is formed by milling end parts through inner teeth on the planetary gear ring, the pre-common cloth groove comprises a slope positioned on the inner teeth and a sliding surface connected with the slope, and a trapezoid end part matched with the slope and the sliding surface is arranged on the elastic snap ring. In some embodiments, a plurality of oil holes communicated with the annular groove are formed in the inner circumference of the synchronizing ring, a plurality of end face grooves are formed in one end, close to the planet carrier, of the synchronizing ring, and the oil holes and