CN105134784B - A kind of compound rolling-element rolling hearing increasing rolling element contact cornerite - Google Patents

Abstract

The invention provides a composite rolling element rolling bearing capable of increasing the contact wrap angle of the rolling elements. The outer surface of the composite rolling body is _a surface wear-resistant material layer with an elastic modulus of E1, and the core of the rolling body is a core soft-base material layer with an elastic modulus of _E2 . The abrasive material layer is fixedly connected to the core soft-base material layer, and the thickness of the surface wear-resistant material layer is H1, which is _H2 less _than the thickness of the core soft-base material layer, so the elastic modulus is E The deformation of the wear-resistant material layer on the surface of ₁ increases, and E ₂ =E ₁ ×(40%~60%), when the load is applied, the two material layers deform at the same time, which effectively increases the distance between the rolling body and the raceway. The contact wrap angle reduces the pressure at the contact position, and improves the wear of the bearing ring and the rupture of the lubricating film in the interference state.

Description

A Composite Rolling Element Rolling Bearing That Can Increase the Contact Wrap Angle of Rolling Elements

technical field

The invention belongs to the field of bearings, and in particular relates to a composite rolling element rolling bearing capable of increasing the contact wrap angle of rolling elements.

Background technique

Rolling bearings are important basic components widely used in machines. For a long time, people have widely used materials with high elastic modulus to manufacture rolling bearings in order to achieve high hardness, high wear resistance and good bearing capacity of rolling bearings. However, a high elastic modulus will lead to small contact deformation between the rolling element and the inner and outer rings of the bearing, small contact area, strong contact pressure, and large friction per unit contact area, which increases the wear of the bearing. A strong contact pressure is also not conducive to the formation of a lubricating oil film, which reduces the anti-friction effect of the lubricant. Such problems are particularly prominent in rolling bearings used under high-speed and heavy-load conditions such as aero-engines and high-speed wheel-rail transportation. Keep the high hardness and high wear resistance of the contact surface between the rolling elements and the inner and outer ring raceways of the bearing, appropriately increase the contact deformation, increase the contact area between the rolling elements and the inner and outer ring raceways of the bearing, and reduce the contact pressure, which can be reduced to a certain extent The wear of rolling bearings improves the life of rolling bearings. Using materials with different elastic modulus to make rolling bearing components is a way to achieve the above effects, that is, the surface layer of the rolling body is a material with high elastic modulus and high hardness, and the core is easy-to-deform material with a low elastic modulus. So far, there has not been a rolling bearing that increases the wrap angle by using a rolling element composed of high and low elastic modulus materials to increase the service life.

Contents of the invention

The purpose of the present invention is to solve the deficiencies in the prior art, and provide a composite rolling element rolling bearing that can increase the contact wrap angle between the rolling element and the raceway. By increasing the contact wrap angle, the problem of bearing ring wear and lubrication can be improved. Membrane rupture problem.

The technical solution of the present invention is: a composite rolling element rolling bearing that can increase the contact wrap angle of the rolling elements, including a bearing inner ring, a bearing outer ring, and a composite rolling element evenly distributed between the bearing inner ring and the bearing outer ring. Rolling body;

The outer surface of the composite rolling element is a surface wear-resistant material layer with an elastic modulus of E ₁ , the core of the composite rolling element is a core soft base material layer with an elastic modulus of E ₂ , and the surface is wear-resistant The material layer is fixedly connected to the core soft base material layer, and E ₂ =E ₁ ×(40%-60%);

The thickness of the wear-resistant material layer on the surface is H ₁ , the diameter of the composite rolling element is d, and

The thickness of the core soft base material layer is H ₂ , and H ₁ is smaller than H ₂ .

In the above scheme, the surface wear _- resistant material layer whose elastic modulus is E1 is made of rolling bearing steel, high-speed steel, high-chromium high-carbon alloy, alumina ceramics or silicon carbide ceramics, and the elastic modulus is _E2 The soft base material layer at the core is made of α-titanium alloy or hypoeutectoid steel.

Further, E ₂ =50% E ₁ .

In the above solution, the surface wear-resistant material layer is fixed on the core soft base material layer by vacuum sputtering, spraying, sintering, embedded casting or mechanical bonding.

Further, the bearing outer diameter D<1mm, the surface wear-resistant material layer is fixed on the core soft base material layer by vacuum sputtering.

Further, the outer diameter of the bearing is 1 mm<D<1 cm, and the surface wear-resistant material layer is fixed on the core soft base material layer by spraying or sintering.

Further, the outer diameter of the bearing is D>1cm, and the surface wear-resistant material layer is fixed on the core soft-base material layer by embedded casting or mechanical bonding.

The beneficial effects of the present invention are: compared with the prior art, the composite rolling element in the present invention includes the surface wear-resistant material layer and the core soft base material layer, and the combination of composite materials changes the The amount of deformation when in contact with the inner ring of the bearing and the outer ring of the bearing effectively increases the contact wrap angle of the rolling elements, reduces the pressure at the contact position, and improves the wear problem of the bearing ring in the interference state Problems with lubricant film rupture.

Description of drawings

Fig. 1 is a schematic structural view of the present invention.

Figure 2 is a schematic diagram of the contact between common rolling elements and bearing tracks.

Fig. 3 is a schematic diagram of the contact between the compound rolling body and the bearing track in the present invention.

Fig. 4 is a structural schematic diagram of the present invention taking a ball bearing as an example.

In the figure, 1. Bearing outer ring; 2. Composite rolling body; 201. Surface wear-resistant material layer; 202. Core soft base material layer; 3. Bearing inner ring; 4. Commonly used rolling body; 5. Bearing track; 6 , Contact wrap angle ɑ; 7, contact wrap angle β.

Detailed ways

In describing the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" ” and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, with a specific configuration and operation, and therefore should not be construed as limiting the invention.

In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrally connected; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

The present invention will be described in further detail below in conjunction with the specific embodiments of the accompanying drawings, but the protection scope of the present invention is not limited thereto.

As shown in Figure 1, it is an embodiment of the composite rolling element rolling bearing that can increase the rolling element contact wrap angle according to the present invention. The composite rolling element rolling bearing that can increase the rolling element contact wrap angle includes a bearing inner ring 3, The bearing outer ring 1 , the composite rolling elements 2 evenly distributed between the bearing inner ring 3 and the bearing outer ring 1 , and the cage wrapping the composite rolling elements 2 .

The outer surface of the composite rolling element 2 is a surface wear-resistant material layer 201 with a modulus of elasticity of E ₁ , and the core of the composite rolling element 2 is a core soft base material layer 202 with a modulus of elasticity of E ₂ . The surface wear-resistant material layer 201 is fixedly connected to the core soft base material layer 202 . For the performance _of the surface wear-resistant material layer 201 with elastic modulus E1, it is required to have high contact fatigue strength, high hardness and wear resistance, sufficient toughness and hardenability.

Figure 2 shows a schematic diagram of the contact between the commonly used rolling elements 4 and the bearing track of the inner or outer ring of the bearing. Under the action of the load F, the commonly used rolling elements 4 are in contact with the bearing track 5 expanded by the inner or outer ring of the bearing and form contact Wrap angle α6.

Figure 3 is a schematic diagram of the contact between the composite rolling body 2 and the bearing inner ring or outer ring in the present invention. Under the action of the same load F, the composite rolling body 2 and the bearing inner ring or outer ring expand The bearing track 5 is in contact and forms a contact wrap angle β7.

The thickness of the surface wear-resistant material layer 201 is H ₁ , the diameter of the rolling element 2 is d, and The thickness of the core soft base material layer 202 is H ₂ , and the thickness H ₁ of the surface wear-resistant material layer 201 with an elastic modulus of E ₁ is smaller than the core soft base material with an elastic modulus of E ₂ The thickness H ₂ of the layer 202, so the deformation of the surface wear-resistant material layer 201 whose modulus of elasticity is E ₁ increases, and E ₂ =E ₁ ×(40%～60%), when the load acts, two kinds The material layers deform simultaneously. Under the same load, due to the increased deformation of the composite rolling element 2, the contact wrap angle β7 is greater than the contact wrap angle α6, thus reducing the pressure at the contact position.

The composite rolling element 2 is suitable for rolling bearings such as ball bearings, roller bearings, tapered roller bearings and drum bearings.

The surface wear-resistant material layer 201 is fixed on the core soft base material layer 202 by vacuum sputtering, spraying, sintering, embedded casting or mechanical bonding.

Among them, when the bearing outer diameter D<1mm, choose vacuum sputtering;

When the outer diameter of the bearing is 1mm<D<1cm, choose spraying or sintering;

When the bearing outer diameter D>1cm, choose embedded casting or mechanical combination.

Figure 4 is a schematic diagram of the combined structure of the composite rolling element 2 applied to a ball bearing as an example. The ball bearing includes the bearing inner ring 3, the bearing outer ring 1 and the inner ring 3 and the bearing The composite rolling body 2 between the outer rings 1, the outer surface of the composite rolling body 2 is a surface wear-resistant material layer 201 with an elastic modulus of E ₁ , and the core of the composite rolling body 2 is an elastic modulus It is the core soft-base material layer 202 of _E2 , and the surface wear-resistant material layer 201 can be made of rolling bearing steel, high-speed steel, high-chromium high-carbon alloy, alumina ceramics or silicon carbide ceramics, and the core soft-base material The layer 202 can be made of α-titanium alloy or hypoeutectoid steel. Preferably, the elastic modulus E ₂ of the core soft base material layer 202 is 50% E ₁ . In the figure, the inner diameter of the bearing is 12 mm, and the outer diameter of the bearing is 37 mm. Since the outer diameter of the bearing is 37 mm, which belongs to the case when the outer diameter of the bearing is D>1 cm, the surface wear-resistant material layer 201 and the core soft-base material layer 202 Choose from cast-in or mechanically bonded.

The composite rolling body 2 is a non-circular body during kinematic contact, and the diameter d of the composite rolling body 2 is 12.5 mm when there is no load; the thickness H ₁ of the bearing steel GCr15 is 1.25 mm, and the contact wrap angle increases big. The present invention changes the deformation of the composite rolling element 2 when in contact with the bearing inner ring 1 and the bearing outer ring 3 through the combination of the surface wear-resistant material layer 201 and the core soft base material layer 202 The amount effectively increases the wrap angle during contact, and at the same time reduces the pressure at the contact position, which improves the wear of the bearing ring and the rupture of the lubricating film in the interference state.

The described embodiment is a preferred implementation of the present invention, but the present invention is not limited to the above-mentioned implementation, without departing from the essence of the present invention, any obvious improvement, replacement or modification that those skilled in the art can make Modifications all belong to the protection scope of the present invention.

Claims (6)

1. the compound rolling-element rolling hearing that one kind can increase rolling element contact cornerite, which is characterized in that including bearing inner race (3), bearing outer ring (1), the compound rolling element being uniformly distributed between the bearing inner race (3) and the bearing outer ring (1) (2)；

The outer surface of the compound rolling element (2) is that elasticity modulus is E₁Surface wear-resistant material layer (201), the compound rolling The center portion of body (2) is that elasticity modulus is E₂Center portion Soft substrate material layer (202), the surface wear-resistant material layer (201) and described Center portion Soft substrate material layer (202) is fixedly connected, and E₂=E₁× (40%~60%)；

The surface wear-resistant material layer (201) with a thickness of H₁, the diameter of the compound rolling element (2) is d, and

The center portion Soft substrate material layer (202) with a thickness of H₂, and H₁Less than H₂；

The elasticity modulus is E₁Surface wear-resistant material layer (201) by roller bearing steel, high-speed steel or high chromium high carbon alloy system At the elasticity modulus is E₂Center portion Soft substrate material layer (202) be made of alpha titanium alloy.

2. the compound rolling-element rolling hearing according to claim 1 for increasing rolling element contact cornerite, which is characterized in that E₂=50%E₁。

3. the compound rolling-element rolling hearing according to claim 1 for increasing rolling element contact cornerite, which is characterized in that It is soft that the surface wear-resistant material layer (201) by vacuum sputtering, spraying, sintering, inlay casting or mechanical bond is fixed on the center portion In based material layer (202).

4. the compound rolling-element rolling hearing according to claim 3 for increasing rolling element contact cornerite, which is characterized in that Bearing outside diameter D < 1mm, the surface wear-resistant material layer (201) are fixed on the center portion Soft substrate material layer by vacuum sputtering (202) on.

5. the compound rolling-element rolling hearing according to claim 3 for increasing rolling element contact cornerite, which is characterized in that Bearing outside diameter 1mm < D < 1cm, the surface wear-resistant material layer (201) is by spraying or is sintered to fix in the center portion Soft substrate material On layer (202).

6. the compound rolling-element rolling hearing according to claim 3 for increasing rolling element contact cornerite, which is characterized in that Bearing outside diameter D > 1cm, the surface wear-resistant material layer (201) are fixed on the center portion Soft substrate material by inlay casting or mechanical bond On layer (202).