CN207033997U

CN207033997U - Dustproof sheet for ball bearing

Info

Publication number: CN207033997U
Application number: CN201720652071.9U
Authority: CN
Inventors: 苏政明; 邱政民; 黄柏融
Original assignee: Hiwin Technologies Corp
Current assignee: Hiwin Technologies Corp
Priority date: 2017-06-07
Filing date: 2017-06-07
Publication date: 2018-02-23
Anticipated expiration: 2027-06-07

Abstract

A kind of dustproof sheet for ball bearing, it is mainly disposed between an inner ring and an outer shroud, the inner peripheral of dustproof sheet has first lip and second lip, first, second lip forms one first opening and one second opening between the outer ring surface of inner ring respectively, and first, second opening meets relationship below in terms of width：1 ＜ W₁/W₂＜ 2, W therein₁For the width of the first opening, W₂For the width of the second opening, the pressure of the first opening can be so allowed to be more than the pressure of the second opening, and then ensure that external foreign matter will not enter Bearing inner when bearing operates, in addition, dustproof sheet is additionally provided with a gap for being less than 0.6mm between first, second opening, ensures that environmental liquids may not flow into Bearing inner when bearing remains static by surface tension.

Description

Dustproof sheet for ball bearing

Technical field

The utility model is relevant with ball bearing, espespecially a kind of dustproof sheet for ball bearing.

Background technology

Referring to Fig. 1, Fig. 1 is the partial sectional view that existing dustproof sheet 1 is installed on ball bearing, among prior art, The internal and external circumferential edge of dustproof sheet 1 has an inner lip 2 and an external lip 3 respectively, and dustproof sheet 1 is by inside and outside lip 2,3 to interfere The mode of cooperation is fixed between inner and outer rings 4,5, but in the case of contact type structure configuration herein, inner ring 4 is in startup The rising of temperature can be caused because of the interference relation between the inner lip 2 of dustproof sheet 1 afterwards.

For problem of temperature rise caused by solving aforementioned contact formula structure, have in addition a kind of prior art be by dustproof sheet with Touchless mode is fixed between inner and outer rings, that is, allow dustproof sheet inner lip and inner ring between possess little by little between Gap, to avoid inner ring on startup with phase mutual friction between the inner lip of dustproof sheet, but an existing non-contact type structure herein Central, the gap between dustproof sheet and inner ring generally passes through special Proportionality design not in terms of width, it is possible that can be right The dust-proof and leak preventing effect of dustproof sheet impacts.

Utility model content

Main purpose of the present utility model is to provide a kind of dustproof sheet for ball bearing, and it has good dust-proof And leak preventing effect.

In order to reach above-mentioned purpose, dustproof sheet of the present utility model is annular in shape and an inner ring located at the ball bearing with Between one outer shroud, the outer peripheral edge of the dustproof sheet is located at the inner ring surface of the outer shroud, the dustproof sheet in face of located at the inner and outer rings it Between the directions of one side towards the plurality of ball of multiple balls extend first lip, the inner peripheral of first lip with One first opening is formed between the outer ring surface of the inner ring, the inner peripheral of the dustproof sheet radially goes out towards the direction of the inner ring One the second lip, one second opening is formed between the inner peripheral of second lip and the outer ring surface of the inner ring, this first, the Two openings meet relationship below in terms of width：1 ＜ W₁/W₂＜ 2, W therein₁For the width of the first opening, W₂For this second The width of opening, the pressure of first opening can be so allowed to be more than the pressure of second opening when the ball bearing operates Power, to ensure that external foreign matter will not enter the inside of the ball bearing at this moment.In addition, the inner peripheral of second lip is interior with this Also there is one to connect second opening and the gap between first, second opening, the gap between the outer ring surface of ring Width be less than 0.6mm, ensure that environmental liquids may not flow into when the ball bearing remains static by surface tension The inside of the ball bearing.

It is preferred that also there is the dustproof sheet one to connect first opening and the gap between first, second lip The problem of backflash, lubricating oil can be flowed back, and then avoiding that grease leakage occurs.

It is preferred that the width in the gap is between 0.1mm-0.5mm.

The beneficial effects of the utility model are that have good dust-proof and leak preventing effect.

Brief description of the drawings

To further illustrate technology contents of the present utility model, with reference to embodiments and accompanying drawing is described in detail as after, its In：

Fig. 1 is the partial sectional view that existing dustproof sheet coordinates ball bearing to use.

Fig. 2 is the stereoscopic figure of dustproof sheet of the present utility model.

Fig. 3 is the stereoscopic figure of the ball bearing of application dustproof sheet of the present utility model.

Fig. 4 is the sectional view of the ball bearing of application dustproof sheet of the present utility model.

Fig. 5 is Fig. 4 partial enlarged drawing, mainly shows that the structure between dustproof sheet of the present utility model and inner and outer rings is closed System.

Embodiment

Fig. 3 and Fig. 4 is referred to, the ball bearing 10 shown in figure includes an outer shroud 12 and one is located in outer shroud 12 Inner ring 14, be provided with multiple balls 16 between outer, inner ring 12,14 so that inner ring 14 can pass through these balls 16 outer shroud 12 relatively Original place rotates.Referring to Fig. 4, dustproof sheet 20 of the present utility model be disposed on when coordinating foregoing ball bearing 10 to use it is outer, Between inner ring 12,14 and positioned at two opposing end surfaces of ball bearing 10.

Again as shown in figures 2 and 5, dustproof sheet 20 of the present utility model is annular in shape in appearance, as in configuration aspects, sheet The outer peripheral edge of the dustproof sheet 20 of utility model has a holding section 22, dustproof sheet 20 of the present utility model by holding section 22 with The mode of interference engagement is in a slot 18 of outer shroud 12, the medial surface of dustproof sheet 20 of the present utility model (that is, face To the one side of ball 16) integratedly extending first lip towards the direction of ball 16 close to the position of the inner peripheral of itself Portion 24, one first opening 26 is formed between the inner peripheral of the first lip 24 and the outer ring surface of inner ring 14.It is of the present utility model anti- The inner peripheral of dirt piece 20 is towards the direction of inner ring 14 integratedly radially outward from second lip 28, the inner peripheral of the second lip 28 One second opening 30 is formed between the outer ring surface of inner ring 14, first, second opening 30 meets relationship below in terms of width： 1 ＜ W₁/W₂＜ 2, W therein₁For the width of the first opening 26, W₂For the width of the second opening 30.

From said structure, when ball bearing 10 comes into operation, pass through the special ratio of first, second opening 26,30 Example relation, the speed for bypassing air through the first opening 26 is less than the speed for passing through the second opening 30, and then allows air to be opened first Pressure caused by mouthful 26 places is permanent to be more than in pressure caused by the second 30 places of opening, thus by Bernoulli law The utilization of (Bernoulli ' s principle), it can be ensured that external foreign matter will not be entered during ball bearing 10 operates To the inside of ball bearing 10.

In addition, dustproof sheet 20 of the present utility model goes back shape between the inner peripheral of the second lip 28 and the outer ring surface of inner ring 14 It is less than 0.6mm into an opening of connection second 30 and the clearance G between first, second opening 26,30, the width of clearance G, In the present embodiment, the optimum range of clearance G is between 0.1mm-0.5mm.Thus, surface caused by clearance G is utilized Power so that environmental liquids (such as water or cutting fluid) can not flow to ball bearing 10 when ball bearing 10 is static by clearance G It is internal.

On the other hand, dustproof sheet 20 of the present utility model also has a connection the between first, second lip 24,28 The backflash 32 of one opening 26 and clearance G, lubricating oil is set to return rolling after flowing to backflash 32 via the first opening 26 The inside of pearl bearing 10, now surface tension caused by clearance G can also stop lubricating oil by, with avoid occur grease leakage Situation.

In summary, dustproof sheet 20 of the present utility model mainly uses touchless design, to solve conventional contacts Problem of temperature rise caused by formula dustproof sheet, pass through the specific proportions relation between first, second opening 26,30 and collocation again in addition The design of clearance G so that no matter dustproof sheet of the present utility model 20 can provide well when ball bearing 10 operates or be static Dust-proof and leak preventing effect, and then the purpose of this utility model.

Claims

1. a kind of dustproof sheet for ball bearing, it is characterised in that the ball bearing includes an outer shroud, one rotationally set Inner ring in the outer shroud, and multiple balls being located between the inner and outer rings, the dustproof sheet are located between the inner and outer rings, should The outer peripheral edge of dustproof sheet is located at the inner ring surface of the outer shroud, and the dustproof sheet is in the one side in face of the respectively ball towards the side of the respectively ball To one first lip is extended, one first opening is formed between the inner peripheral of first lip and the outer ring surface of the inner ring, this is anti- The inner peripheral of dirt piece radially goes out one second lip, inner peripheral and the inner ring of second lip towards the direction of the inner ring One second opening is formed between outer ring surface, the width of first opening and the width of second opening meet relationship below：1 ＜ W₁/W₂＜ 2, W therein₁For the width of the first opening, W₂For the width of second opening, the inner peripheral of second lip is with being somebody's turn to do Also there is a connection second opening and the gap between first, second opening, the gap between the outer ring surface of inner ring Width be less than 0.6mm.

2. as claimed in claim 1 be used for ball bearing dustproof sheet, it is characterised in that wherein first, second lip it Between also there is a backflash, the backflash connects first opening and the gap.

3. as claimed in claim 1 be used for ball bearing dustproof sheet, it is characterised in that wherein the width in the gap between Between 0.1mm-0.5mm.