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US-12623573-B2 - Pumping device for vehicle seat

US12623573B2US 12623573 B2US12623573 B2US 12623573B2US-12623573-B2

Abstract

A pumping device for a vehicle seat includes a cover configured to be coupled to one surface of a housing, a brake drum assembled in the housing and having a coupling protrusion provided at a center of one surface of the brake drum that is directed toward the cover, a locking plate positioned between the brake drum and the cover and having a through-hole configured to be coupled to the coupling protrusion, the locking plate being configured to implement a locking state in which the through-hole is coupled to the coupling protrusion, or the locking plate being configured to implement an unlocking state in which the through-hole is separated from the coupling protrusion.

Inventors

  • Won Kim

Assignees

  • HYUNDAI TRANSYS INC.

Dates

Publication Date
20260512
Application Date
20241126
Priority Date
20231127

Claims (9)

  1. 1 . A pumping device for a vehicle seat, the pumping device comprising: a cover configured to be coupled to one surface of a housing and having guide protrusions defined on one surface of the cover, a brake drum disposed in the housing and having a coupling protrusion defined at a center of one surface of the brake drum that is directed toward the cover; a locking plate positioned between the brake drum and the cover and having a through-hole configured to be coupled to the coupling protrusion, the locking plate further having guide holes defined around the through-hole, wherein the locking plate is configured to: implement a locking state in which a rotation of the brake drum is restricted when the through-hole is coupled to the coupling protrusion as the guide holes defined around the through-hole move in a state in which the guide holes are coupled to the guide protrusions defined on one surface of the cover, or implement an unlocking state in which the through-hole is separated from the coupling protrusion; and an elastic member disposed between the cover and the locking plate and configured to elastically support the locking plate.
  2. 2 . The pumping device of claim 1 , wherein each of an outer-diameter portion of the coupling protrusion and an inner-diameter portion of the through-hole has a concave-convex portion.
  3. 3 . The pumping device of claim 1 , wherein protruding portions are defined along an edge of one surface of the locking plate, wherein accommodation grooves are each defined between the protruding portions, wherein each of the accommodation grooves has two opposite surfaces, each of the two opposite surfaces being defined as an inclined surface, wherein protrusions are defined along an outer-diameter portion of the brake drum, and wherein extension portions defined along an outer-diameter portion of a clutch drum are each inserted between the protrusions defined along the outer-diameter portion of the brake drum.
  4. 4 . The pumping device of claim 3 , wherein when power is transmitted to the clutch drum, the clutch drum is configured to rotate, ends of the extension portions inserted into the accommodation grooves are configured to move to the protruding portions along the inclined surfaces of the accommodation grooves, the locking plate is configured to be pushed in a direction toward the cover, and the through-hole and the coupling protrusion are configured to be uncoupled, such that the unlocking state is implemented.
  5. 5 . The pumping device of claim 4 , wherein when no power is transmitted to the clutch drum, the locking plate is configured to be pushed in a direction toward the brake drum by an elastic force of the elastic member, and the through-hole is configured to be coupled to the coupling protrusion, such that the locking state is implemented.
  6. 6 . The pumping device of claim 3 , wherein the pumping device further comprises rollers, each being positioned between each of the protrusions defined along the outer-diameter portion of the brake drum and each of the extension portions.
  7. 7 . The pumping device of claim 6 , wherein the clutch drum is configured to receive power transmitted through a shaft, and the shaft penetrates the housing and is power-connected to the clutch drum disposed in the housing.
  8. 8 . The pumping device of claim 7 , wherein when the power is transmitted to the clutch drum through the shaft, the extension portions are configured to press the rollers while rotating, such that the brake drum rotates and a rotational force of the brake drum is transmitted to a pinion gear power-connected to the brake drum.
  9. 9 . The pumping device of claim 8 , wherein the pinion gear is configured to transmit the rotational force of the pinion gear to a gear of a link engaging with the pinion gear, and the link is configured to adjust a height of a seat cushion by a raising/lowering operation of the link.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to and the benefit of Korean Patent Application No. 10-2023-0167210 filed in the Korean Intellectual Property Office on Nov. 27, 2023, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD The present invention relates to a pumping device for a vehicle seat. BACKGROUND ART In general, a pumping device for a vehicle seat refers to a device configured to enable an occupant seated in a seat to adjust a height of a seat cushion to fit the occupant's body type. Power of a lever or a drive motor may be transmitted to a link mechanism by means of the pumping device for a vehicle seat, such that the link mechanism may operate. The seat cushion may be raised or lowered by an operation of the link mechanism. Therefore, a height of the seat cushion may be adjusted. However, when an external force is applied to the pumping device for a vehicle seat, a load, which is generated by unevenness, vibration, or the like while the vehicle travels, is repeatedly transmitted into a housing, which causes a slip of a brake drum. DOCUMENT OF RELATED ART Patent Document (Patent Document 1) Korean Patent No. 10-1627641 (published on Jun. 8, 2016) SUMMARY OF THE INVENTION The present invention has been made in an effort to solve the above-mentioned problem, and an object of the present invention is to provide a pumping device for a vehicle seat that is capable of applying a separate locking structure and preventing a slip caused by an external force. In order to achieve the above-mentioned object, the present invention provides a pumping device for a vehicle seat, the pumping device including: a cover configured to be coupled to one surface of a housing; a brake drum assembled in the housing and having a coupling protrusion provided at a center of one surface of the brake drum that is directed toward the cover; a locking plate positioned between the brake drum and the cover and having a through-hole configured to be coupled to the coupling protrusion, the locking plate being configured to implement a locking state in which a rotation of the brake drum is restricted when the through-hole is coupled to the coupling protrusion as guide holes provided around the through-hole move in a state in which the guide holes are coupled to guide protrusions provided on one surface of the cover, or the locking plate being configured to implement an unlocking state in which the through-hole is separated from the coupling protrusion; and an elastic member disposed between the cover and the locking plate and configured to elastically support the locking plate. In addition, an outer-diameter portion of the coupling protrusion and an inner-diameter portion of the through-hole may each be configured as a concave-convex portion. In addition, accommodation grooves may each be formed between protruding portions provided along an edge of one surface of the locking plate and each have two opposite surfaces each formed as an inclined surface, protrusions may be provided along an outer-diameter portion of the brake drum, and extension portions provided along an outer-diameter portion of a clutch drum may each be inserted between the protrusions. In addition, when power is transmitted to the clutch drum, the clutch drum may rotate, ends of the extension portions inserted into the accommodation grooves may move to the protruding portions along the inclined surfaces of the accommodation grooves, the locking plate may be pushed in a direction toward the cover, and the through-hole and the coupling protrusion may be uncoupled, such that the unlocking state may be implemented. In addition, when no power is transmitted to the clutch drum, the locking plate may be pushed in a direction toward the brake drum by an elastic force of the elastic member, and the through-hole may be coupled to the coupling protrusion, such that the locking state may be implemented. In addition, rollers may each be positioned between the protrusion and the extension portion. In addition, power may be transmitted to the clutch drum through a shaft, and the shaft may penetrate the housing and be power-connected to the clutch drum assembled in the housing. In addition, when the power is transmitted to the clutch drum through the shaft, the extension portions may press the rollers while rotating, such that the brake drum may rotate, and a rotational force of the brake drum may be transmitted to a pinion gear power-connected to the brake drum. In addition, the rotational force of the pinion gear may be transmitted to a gear of a link engaging with the pinion gear, and a height of a seat cushion may be adjusted by a raising/lowering operation of the link. In addition, power may be generated by a lever or a drive motor. According to the present invention, it is possible to apply the separate locking structure and prevent a slip caused by an external force. The foregoing summary is illustrative only a