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CN-117028533-B - Ventilation plug and transmission

CN117028533BCN 117028533 BCN117028533 BCN 117028533BCN-117028533-B

Abstract

The invention belongs to parts of a transmission, and provides a vent plug, the transmission, and the vent plug, which comprise a plug cap and a core body, in order to solve the technical problems that the existing vent plug structure is difficult to meet the current and future transmission requirements in terms of dust prevention, water vapor prevention, oil blocking, space and the like. The plug cap is sleeved at the upper end of the core body, and the lower end of the core body is hermetically arranged in the ventilation plug hole of the transmission shell. The core body is in a hollow column shape, and the hollow structure in the core body is marked as a cavity. The side wall of the core body is provided with a first vent hole, a second vent hole and an oil return hole, the outer wall of the core body is provided with at least one first annular boss and at least one second annular boss, and the side wall of the upper end of the core body is provided with a vent channel. The first annular boss is provided with a first opening, and the second annular boss is provided with a second opening. The lower end of the cavity, the first vent hole, the first opening, the second vent hole, the upper end of the cavity, the vent channel and the second opening are sequentially communicated to form a gas passage.

Inventors

  • QUAN DONG
  • Ma Xuyao
  • LIU YI
  • FENG HAOCHENG
  • YANG XUAN
  • ZHU JIAXING
  • HE JIAYI

Assignees

  • 陕西法士特齿轮有限责任公司

Dates

Publication Date
20260512
Application Date
20230720

Claims (9)

  1. 1. A ventilation plug is characterized by comprising a plug cap (2) and a core body (1); the plug cap (2) is sleeved at the upper end of the core body (1), and the lower end of the core body (1) is hermetically arranged in the transmission shell ventilation plug hole (3); the core body (1) is in a hollow column shape, the hollow structure in the core body (1) is marked as a cavity, and the cavity is communicated with the inside of the transmission shell ventilation plug hole (3); The oil return hole (5) is positioned at the lowest part, at least one first annular boss (13) and at least one second annular boss (9) are arranged on the outer wall of the core body (1), an air ventilation channel (17) is arranged on the side wall of the upper end of the core body (1), a first opening (10) is arranged on the first annular boss (13), and a second opening (14) is arranged on the second annular boss (9); The outer wall of the core body (1) is also provided with a third annular boss (12) and a buckle (4); The third annular boss (12) is axially positioned between the first annular boss (13) and the second annular boss (9), and the buckle (4) is positioned on the lower end face of the core body (1); The lower end face of the third annular boss (12) is abutted against and sealed with the upper end face of the side wall of the transmission housing ventilation plug hole (3), and the upper end face of the buckle (4) is abutted against the lower end face of the side wall of the transmission housing ventilation plug hole (3); a gap is reserved between the lower end face of the plug cap (2) and the upper end face of the third annular boss (12), so that a channel communicated between the gas passage and the external atmosphere is formed; the lower end of the cavity, the first vent hole (6), the first opening (10), the second vent hole (11), the upper end of the cavity, the vent channel (17) and the second opening (14) are sequentially communicated to form a gas passage, and then are communicated with the outside atmosphere.
  2. 2. A vent plug according to claim 1, wherein: the buckle (4) is located at the end face of the lower end of the core body (1), and a plurality of telescopic grooves (19) are formed in the end face of the lower end of the core body (1) along the circumferential direction.
  3. 3. A vent plug according to claim 1 or 2, wherein: a first limit step (7) is arranged on the plug cap (2), and a second limit step (8) is arranged on the side wall of the cavity; The first limiting step (7) is matched with the second limiting step (8) and is used for axially limiting and radially limiting the plug cap (2) relative to the core body (1), and a gap is reserved between the first limiting step (7) and the second limiting step (8) to form a channel between the upper end of the cavity in the gas passage and the ventilation channel (17).
  4. 4. A vent plug according to claim 3, wherein the upper end surface of the core body (1) is provided with a plurality of grooves uniformly along the circumferential direction to form the vent channel (17).
  5. 5. A vent plug according to claim 4, wherein the plug cap (2) comprises a cap body (201) and a stopper body (202) connected to the inside of the cap body (201); The top surface (18) inside the cap body is propped against the upper end surface of the core body (1), and the limiting body (202) extends into the cavity; the first limiting step (7) is arranged on the outer side wall of the limiting body (202); A gap is reserved between the lower end face of the cap body (201) and the upper end face of the third annular boss (12), so that a channel communicated between the gas passage and the external atmosphere is formed.
  6. 6. A vent plug according to claim 5, wherein: The two first annular bosses (13) and the two second annular bosses (9) are respectively arranged, the first annular bosses (13) are propped against the inner wall of the ventilation plug hole (3) of the transmission shell, and the second annular bosses (9) are propped against the inner wall of the cap body (201); the first openings (10) and the second openings (14) are provided with a plurality of openings and are uniformly distributed along the circumferential direction of the corresponding annular boss; The first notches (10) on the two first annular bosses (13) are arranged in a staggered mode, and the second notches (14) on the two second annular bosses (9) are arranged in a staggered mode.
  7. 7. A vent plug according to claim 6, wherein a fourth annular boss (15) is provided on the lower end side wall of the core (1); The lower end face of the fourth annular boss (15) is propped against a mounting step (16) on the inner wall of the ventilation plug hole (3) of the transmission shell.
  8. 8. A vent plug according to claim 7, wherein the first vent hole (6) and the oil return hole (5) are both located on a fourth annular boss (15).
  9. 9. A speed changer comprises a speed changer body and a vent plug, and is characterized in that: The vent plug employing any one of claims 1 to 8.

Description

Ventilation plug and transmission Technical Field The invention belongs to parts of a transmission, and relates to a vent plug and the transmission. Background When the transmission works, the temperature in the box body can be increased continuously, and the air pressure in the box body is increased. Under continuous high pressure, sealing performance of sealing parts of the transmission, such as an oil seal and the like, is gradually reduced, so that oil seepage of the transmission occurs. To solve this problem, the transmissions are all fitted with vent plugs. The vent plug has three main functions of 1, communicating the interior of the transmission with the external atmosphere to balance the interior of the transmission with the external air pressure, 2, blocking dust or moisture in the external atmosphere from entering the transmission, and 3, blocking oil mist in the interior of the transmission from being discharged out of the transmission, reducing the loss of lubricating oil and preventing the oil mist from polluting the atmosphere. Therefore, the vent plug of the automobile transmission has the functions of dust prevention and oil leakage prevention besides the function of ventilation with the outside. Currently, the vent plugs on the market mainly have the following problems: 1. the effect of preventing external dust and water vapor from entering the interior of the transmission is poor; 2. when the transmission gear runs at a high speed, gear oil is easy to splash under stirring, so that part of oil is splashed around the vent plug, and oil seepage can occur if the vent plug is insufficient in oil blocking function; 3. the oil blocking structure is required to be matched in the transmission shell, so that the carrying space of the transmission can be affected. With the advent of the electrified era, the space requirements, the sealing performance and the like of the transmission are higher and higher for automobiles, and the current transmission vent plug structure is difficult to meet the current and future transmission requirements. Disclosure of Invention The invention provides a vent plug and a transmission, which aim to solve the technical problems that the existing vent plug structure is difficult to meet the current and future transmission requirements in the aspects of dust prevention, water vapor prevention, oil blocking, space and the like. In order to achieve the above purpose, the invention is realized by adopting the following technical scheme: a vent plug comprising a plug cap and a core; the plug cap is sleeved at the upper end of the core body, and the lower end of the core body is hermetically arranged in the ventilation plug hole of the transmission shell; the hollow structure in the core body is marked as a cavity, and the lower end of the cavity is communicated with the inside of the ventilation plug hole of the transmission shell; The side wall of the upper end of the core body is provided with a ventilation channel, a first opening is formed in the first annular boss, and a second opening is formed in the second annular boss; the lower end of the cavity, the first vent hole, the first opening, the second vent hole, the upper end of the cavity, the vent channel and the second opening are sequentially communicated to form a gas passage, and then are communicated with the outside atmosphere. Further, a third annular boss and a buckle are further arranged on the outer wall of the core body; the third annular boss is axially positioned between the first annular boss and the second annular boss, and the buckle is positioned on the lower end face of the core body; the lower end face of the third annular boss is abutted against and sealed with the upper end face of the side wall of the ventilation plug hole of the transmission shell, and the upper end face of the buckle is abutted against the lower end face of the side wall of the ventilation plug hole of the transmission shell; a gap is reserved between the lower end face of the plug cap and the upper end face of the third annular boss, so that a channel communicated between the gas passage and the external atmosphere is formed. Further, the buckle is located core lower extreme terminal surface department, has offered a plurality of expansion grooves along circumference on the core lower extreme terminal surface. Further, a first limiting step is arranged on the plug cap, and a second limiting step is arranged on the side wall of the cavity; The first limiting step is matched with the second limiting step and is used for axially limiting and radially limiting the plug cap relative to the core body, and a gap is reserved between the first limiting step and the second limiting step to form a channel between the upper end of the cavity in the gas passage and the ventilation channel. Further, a plurality of grooves are uniformly formed in the upper end face of the core body along the circumferential direction, so that the ventilation