CN202294950U

CN202294950U - Spacing structure of skeleton oil seal of steering oil pump

Info

Publication number: CN202294950U
Application number: CN2011204279684U
Authority: CN
Inventors: 张军成; 孟乃军; 陈仲尧; 南百军; 王建强
Original assignee: Zhejiang Henglong Vie Pump Co Ltd
Current assignee: ZHEJIANG VIE PUMP-MANU CO., LTD.
Priority date: 2011-11-02
Filing date: 2011-11-02
Publication date: 2012-07-04
Anticipated expiration: 2021-11-02

Abstract

The utility model discloses a spacing structure of a skeleton oil seal of a steering oil pump, which comprises a pump body and a steering shaft hole passing through the left and right sides of the pump body. A steering shaft is arranged inside the steering shaft hole. An oil duct hole arranged inside the pump body is communicated with the left side of the steering shaft hole. The steering shaft hole is provided with a bearing positioned between the right side of the pump body and the steering shaft. A skeleton oil seal is arranged between the oil duct hole and the bearing. A retaining ring is arranged between the skeleton oil seal and the bearing. According to the utility model, the spacing retaining ring arranged between the skeleton oil seal and the bearing of the steering oil pump is used for preventing the slipping of the skeleton oil seal towards the bearing. The spacing structure of the skeleton oil seal is simple and reasonable in structure. When a power-assisted steering oil pump is in operation and the pressure in the C cavity of the pump body is greater than the frictional force of the skeleton oil seal during the vacuum filling of hydraulic oil, the movement of the skeleton oil seal towards the bearing end under the pressure effect is prevented. Meanwhile, the skeleton oil seal is prevented from being in contact with the rotating inner ring of the bearing.

Description

A kind of power steerig pump outside framework oil seal position limiting structure

Technical field

The utility model relates to the constituent elements of steering pump, particularly a kind of steering pump outside framework oil seal structure.

Background technology

As shown in Figure 1, when most of steering pumps were worked, outside framework oil seal 2 produced positive pressure through the rubber in the pump housing 4 outsides and the interference fit of pump housing size; Produce friction force through pressure and friction coefficient and prevent that outside framework oil seal from moving, as shown in Figure 2, when the A of the pump housing 4 face positive pressure and friction coefficient hour; The pressure that has of the pump housing exists when the power steering fluid pump work and during vacuum filling hydraulic oil; Under the situation of pressure greater than the friction force of outside framework oil seal in C chamber, outside framework oil seal can make outside framework oil seal move to bearing 6 ends under pressure, contacts until the inner ring that makes outside framework oil seal with the rotation of bearing; The bearing inner ring of high speed revolution produces wearing and tearing to outside framework oil seal; And produce abrasive dust particulate matter clamping stagnation at outside framework oil seal lip place, and cause seal failure, more seriously cause outside framework oil seal to be scrapped and cause power steering oil pump to be scrapped.

The utility model content

The utility model technical matters to be solved just provides a kind of power steerig pump outside framework oil seal position limiting structure, improves through simple structure, makes outside framework oil seal avoid contact and produce wearing and tearing, raising leak free reliability with the inner ring of the rotation of bearing.

For solving the problems of the technologies described above; The utility model adopts following technical scheme: a kind of power steerig pump outside framework oil seal position limiting structure; The axis hole that turns to that comprises the pump housing and the perforation pump housing left and right sides; Turn to be provided with steering shaft in the axis hole, be provided with the oil hole connection in the pump housing and turn to the axis hole left side, turn to axis hole between pump housing right side and steering shaft, to be provided with bearing; Outside framework oil seal is located between oil hole and the bearing, it is characterized in that: a back-up ring is located at and is prevented between outside framework oil seal and the bearing that outside framework oil seal is to the slippage of bearing direction.

As preferably, said back-up ring is located in the annular groove between bearing and outside framework oil seal.

As preferably, the internal diameter of said back-up ring is greater than the bearing cone size and less than the outside framework oil seal outside dimension, and the external diameter of back-up ring is less than or equal to the outside race size.

As preferably, the outside framework oil seal side outer ring of said back-up ring is rounded down, and the outside framework oil seal side outer ring of said annular groove is provided with cannelure.

The utility model is provided with between the outside framework oil seal of power steerig pump and bearing and prevents the spacing back-up ring of outside framework oil seal to the slippage of bearing direction; Simple and reasonable outside framework oil seal position limiting structure is provided; The pump housing under the situation of pressure greater than the friction force of outside framework oil seal in C chamber when the power steering fluid pump work and during vacuum filling hydraulic oil; Prevent that outside framework oil seal from making outside framework oil seal move to the bearing end under pressure, stop outside framework oil seal is contacted with the inner ring of the rotation of bearing.

Description of drawings

Below in conjunction with the accompanying drawing and the specific embodiment the utility model is further described:

Fig. 1 turns to oil pump outside framework oil seal structural representation (before the oil sealing slippage) in the prior art;

Fig. 2 turns to oil pump outside framework oil seal structural representation (after the oil sealing slippage) in the prior art;

Fig. 3 improves back power steerig pump outside framework oil seal structural representation for the utility model;

Fig. 4 is the back-up ring structural representation.

The specific embodiment

Like Fig. 3 and shown in Figure 4; Be the embodiment of the utility model power steerig pump outside framework oil seal position limiting structure, comprise the axis hole that turns to of the pump housing 4 and the perforation pump housing left and right sides, turn to and be provided with steering shaft 7 in the axis hole; Be provided with oil hole 3 connections in the pump housing and turn to the axis hole left side; Turn to axis hole between pump housing right side and steering shaft, to be provided with bearing 6, outside framework oil seal 2 is located between oil hole and the bearing, and a back-up ring 1 is located at and is prevented between outside framework oil seal 2 and the bearing that outside framework oil seal is to the slippage of bearing direction.Said back-up ring 1 is located in the annular groove between bearing and outside framework oil seal.The internal diameter of said back-up ring 1 is greater than the bearing cone size and less than the outside framework oil seal outside dimension, and the external diameter of back-up ring is less than or equal to the outside race size.The outside framework oil seal side outer ring of said back-up ring is rounded down 11, and the outside framework oil seal side outer ring of said annular groove is provided with cannelure 41.

Pass through oil inlet 5 when pressure that pump housing C chamber produces when the power steering fluid pump work and oil-feed filling; Flow through the low pressure in 3 dozens of pump housing C of oil duct chamber to outside framework oil seal 2 annular groove chamber D effects; To outside framework oil seal thrust; Though when the friction force of this application force greater than outside framework oil seal, skeleton oil pump front end has the spacing of back-up ring 1, makes outside framework oil seal remain on the position of requirement.

Power steerig pump outside framework oil seal position limiting structure in the utility model is not limited to the foregoing description, for example can also be spacing draw-in groove.

Claims

1. power steerig pump outside framework oil seal position limiting structure; The axis hole that turns to that comprises the pump housing (4) and the perforation pump housing left and right sides; Turn to be provided with steering shaft (7) in the axis hole, be provided with oil hole (3) connection in the pump housing and turn to the axis hole left side, turn to axis hole between pump housing right side and steering shaft, to be provided with bearing (6); Outside framework oil seal (2) is located between oil hole and the bearing, it is characterized in that: a back-up ring (1) is located at and is prevented between outside framework oil seal (2) and the bearing that outside framework oil seal is to the slippage of bearing direction.

2. a kind of power steerig pump outside framework oil seal position limiting structure according to claim 1, it is characterized in that: said back-up ring (1) is located in the annular groove between bearing and outside framework oil seal.

3. a kind of power steerig pump outside framework oil seal position limiting structure according to claim 2, it is characterized in that: the internal diameter of said back-up ring (1) is greater than the bearing cone size and less than the outside framework oil seal outside dimension, and the external diameter of back-up ring is less than or equal to the outside race size.

4. a kind of power steerig pump outside framework oil seal position limiting structure according to claim 3 is characterized in that: the outside framework oil seal side outer ring of said back-up ring (1) is rounded down (11), and the outside framework oil seal side outer ring of said annular groove is provided with cannelure (41).