CN202756245U

CN202756245U - Sway piston type electric vacuum pump

Info

Publication number: CN202756245U
Application number: CN 201220348032
Authority: CN
Inventors: 罗薇; 李艳辉; 欧阳旭
Original assignee: Shanghai Xu Dao Auto Parts And Components Co Ltd
Current assignee: Shanghai Xu Dao Auto Parts And Components Co Ltd
Priority date: 2012-07-18
Filing date: 2012-07-18
Publication date: 2013-02-27
Anticipated expiration: 2022-07-18

Abstract

The utility relates to a vacuum pump for a vehicle, and specifically relates to a novel sway piston type electric vacuum pump. The sway piston type electric vacuum pump comprises a motor, a pump body, a motor shaft, an eccentric gear, an eccentric shaft, a piston body, a piston ring and a bearing. The sway piston type electric vacuum pump is characterized by further comprising a rubber supporting ring. The rubber supporting ring is arranged between the piston body and the piston ring. The outer edge of the rubber supporting ring is of a spherical surface structure. The sway piston type electric vacuum pump has the advantages of being simple in structure, good in sealing performance, effective in improving the low temperature performance of the vacuum pump, and capable of meeting the requirement of the service environment of the vehicle.

Description

The swing piston type electric vacuum pump

Technical field

The utility model relates to a kind of vehicle vacuum pump, specifically a kind of Novel swing piston type electric vacuum pump.

Background technique

Automobile brake booster uses vacuum as its work energy widely, provides vacuum source by motor or vacuum pump (mechanical type or electrodynamic type) to it generally speaking, and present vehicle vacuum pump is vane pump or reciprocating pump basically.

Wave piston structure and on market, existed for many years, have compact structure, reliable performance, the advantage such as with low cost; Piston also carries out the swing of several angle when moving back and forth; Be arranged in the flexible plunger ring on the piston, when piston swings, keep the sealing of piston.

Traditional to wave between its piston of piston structure and the cylinder be Spielpassung, and the sealing height of piston depends on the flexibility of piston ring; And the flexible at low temperatures decline of the piston ring that plastics are made causes the sealability of piston undesired, thereby affects pump performance.

In the development process of Vehicular electric vacuum pump, traditional swing piston type vacuum pump is proved to be in test the Environmental Conditions that is not suitable for automobile, particularly vacuum pump and descends in low temperature environment lower seal performance, can't satisfy the usage requirement of automobile.

The model utility content

The purpose of this utility model is to provide a kind of simple and reasonable, and good seal performance can be improved the cryogenic property of vacuum pump effectively, thereby satisfies the swing piston type electric vacuum pump of the desired Environmental Conditions of automobile.

The purpose of this utility model is to realize like this, this vacuum pump comprises motor, the pump housing, motor shaft, eccentric wheel, eccentric shaft, piston only, piston ring and bearing, it is characterized in that: it also comprises the rubber ring, described rubber ring is arranged between piston only and the piston ring, and the outer rim of rubber ring is spheric structure.

The utlity model has following advantage and good effect:

1, the utility model improves traditional piston structure that waves, between the piston only of hard and piston ring, increased a rubber ring, the support ring outer rim adopts spherical (sphere) structure, form slight interference fit between piston and the cylinder, enable to adapt to better the Environmental Conditions of automobile.

2, because the rubber ring outer rim of setting up between the utility model hard piston only and the piston ring is sphere, therefore when piston swings, it is constant that the magnitude of interference of piston keeps, thereby guaranteed lower driving torque, effectively improve the cryogenic property of vacuum pump, thereby satisfied the desired Environmental Conditions of automobile.

Description of drawings

Fig. 1 is swing piston type electric vacuum pump overall structure schematic diagram.

Fig. 2 is the utility model piston only part-structure enlarged diagram.

Embodiment

Shown in accompanying drawing 1,2: this vacuum pump comprises motor 1, be arranged on the pump housing 2, motor shaft 3 below the motor 1, be arranged on the eccentric wheel 4 on the motor shaft, be arranged on the eccentric shaft 5 on the eccentric wheel 4, be sleeved on two piston onlies 6 on the eccentric shaft 5 by bearing 9, the piston ring 7 that arranges on each piston only 6, it is characterized in that it also comprises rubber ring 8, described rubber ring 8 is arranged between each piston only 6 and the piston ring 7, and the outer rim of rubber ring 8 is spheric structure.

Claims

1. swing piston type electric vacuum pump, this vacuum pump comprises motor (1), the pump housing (2), motor shaft (3), eccentric wheel (4), eccentric shaft (5), piston only (6), piston ring (7) and bearing (9), it is characterized in that: it also comprises rubber ring (8), described rubber ring (8) is arranged between piston only (6) and the piston ring (7), and the outer rim of rubber ring (8) is spheric structure.