Deep groove ball bearing of plunger oil pump

Abstract

The utility model relates to a deep groove ball bearing of a plunger oil pump. The deep groove ball bearing comprises an outer ring, an inner ring, a retainer and a plurality of steel balls, a plurality of steel balls are uniformly and annularly arranged between the outer ring raceway and the inner ring raceway and are distributed in a plurality of pockets of the retainer; the inner diameter of the inner ring is of a convex taper angle structure; the convex taper angle structure is a slope angle which is formed from two ends of the inner diameter of the inner ring to the middle direction and is close to the center point of the bearing; the intersection point of the radial extension line of the bearing center point and the inner diameter of the inner ring is the vertex of the slope angle; according to the scheme, the inner ring with the taper angle is directly used for replacing an inner ring and a reaction ring, and accumulated errors of machining and assembling of two parts are avoided; the difference between the wall thickness of the bearing outer ring and the diameter of the inner ring with the taper angle is large, so that the bearing is directly and well connected with a plunger, and meanwhile, the bearing has high rigidity and can bear larger impact load; the bearing can overcome the defects that the inner diameter of the bearing is wriggled and worn, the temperature of the bearing is too high, the service life is short and the like due to the interference fit mode of the inner hole of the inner ring and the reaction ring.

Description

Technical Field

[0001] The utility model relates to a bearing for a plunger oil pump, in particular to a plunger oil pump deep groove ball bearing, which is mainly used in the pump industry and is used on a connecting rod small end in a plunger type oil pump crank connecting rod mechanism. Background Art

[0002] The bearing unit of this type of plunger oil pump originally used deep groove ball bearings to withstand radial impact loads. Due to the structural characteristics and use requirements of the bearing, the inner hole of the inner ring of the bearing and the reaction ring have an interference fit. Due to the impact load of long-term operation, the inner hole of the inner ring and the shaft often slide relative to each other during operation, resulting in creep, causing the bearing temperature to rise and the bearing to be damaged. Utility Model Content

[0003] In order to overcome the problems of creep wear of the bearing inner diameter, high bearing temperature, short life, etc., the purpose of the utility model is to provide a plunger oil pump deep groove ball bearing, which adopts a tapered inner ring instead of the traditional inner ring and reaction ring interference fit method, and has the characteristics of large load-bearing capacity and impact resistance.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a plunger oil pump deep groove ball bearing, comprising: an outer ring, an inner ring, a retainer and a plurality of steel balls; the plurality of steel balls are evenly arranged between the outer ring raceway and the inner ring raceway, and are distributed in a plurality of pockets of the retainer; the inner diameter of the inner ring is a convex cone angle structure;

[0005] Furthermore, the cage adopts a split two-body structure, including a cage seat part and a cage cover part; the cage seat and the cage cover are correspondingly provided with rivet holes, and the cage seat and the cage cover are connected together through a rivet;

[0006] Furthermore, the convex cone angle structure is that the two ends of the inner diameter of the inner ring form a slope angle approaching the center point of the bearing in the middle direction; the intersection of the radial extension line of the center point of the bearing and the inner diameter of the inner ring is the vertex of the slope angle, which is also the convex cone angle point of the inner diameter of the inner ring;

[0007] Furthermore, the inner circle slope angle vertex to the two ends of the inner circle inner diameter are respectively inner circle slope surfaces, and the two slope surfaces are symmetrical to each other with the inner circle slope angle vertex as the center;

[0008] Furthermore, the degree of each inner ring slope surface is set to 10°.

[0009] The above-mentioned convex cone angle inner ring is used to replace the original inner ring and reaction ring matching form, so that the bearing has a large load-bearing capacity and strong impact resistance; and the cumulative errors in the processing and assembly of the inner ring and the reaction ring are avoided;

[0010] The bearing of the utility model is applied in the plunger type oil pump structure, and the technical concept adopted is: the inner hole of the inner ring of the bearing is connected to the shaft of the oil pump through a plunger, and a rotor is arranged in the oil pump; two slope surfaces on the outer diameter of the shaft corresponding to the inner diameter of the inner ring are respectively arranged along the circumference of the shaft with a row of plungers of the same number; the head end of each row of plungers contacts the slope surface of the inner ring;

[0011] Furthermore, the number of plungers in each row is set to 11, and the 22 plungers in the two rows of plungers correspond to each other in pairs; the 22 plungers extend out under the action of centrifugal force and high-pressure oil during rotation;

[0012] Furthermore, a plunger head is provided at the front end of each plunger, and 22 plunger heads are connected to two slope surfaces of the inner ring of the bearing, and the inner ring of the bearing rotates under the action of the plunger heads extending and contacting; 11 plunger heads contact one slope surface of the inner ring, and the plunger heads of the two slope surfaces contact each other to produce axial forces that offset each other and form a balanced state;

[0013] Furthermore, each plunger head is a truncated cone structure with a central hole, and the conical surface of the truncated cone is set as a slope surface with a 10° angle; when the plunger is extended and contacts the inner ring, the slope surface of the plunger head and the slope surface of the inner ring generate surface-to-surface contact;

[0014] Wherein, the plunger head diameter is 14mm, and the center hole diameter is 3mm;

[0015] Furthermore, the distance between the contact surface between the plunger head and the inner ring and the vertex of the inner ring slope angle (the apex of the convex cone angle of the inner ring inner diameter) is 1 mm;

[0016] Furthermore, the wall thickness of the convex cone angle inner ring accounts for more than 30% of the cross-sectional size of the bearing, so that the bearing is directly connected to the plunger well, and at the same time has strong rigidity and can withstand greater impact loads.

[0017] When the plunger oil pump bearing unit is used, when the rotor rotates, the plunger extends out due to the centrifugal force, and the 10° slope surface of the plunger head abuts against the 10° slope surface of the bearing inner ring, forming a soft connection structure (the higher the pressure, the greater the abutment force); due to the soft connection structure, the speed of the bearing inner ring is always slower than the rotor speed. At this time, the plunger will produce self-rotation motion, and the 10° slope surface of the plunger head performs rolling friction motion on the 10° slope surface of the bearing inner ring, thereby reducing wear and heat.

[0018] The beneficial effects of the utility model are:

[0019] This solution directly uses a tapered inner ring to replace the inner ring and reaction ring, and designs a deep groove ball bearing unit with large load-bearing capacity and impact resistance; using a tapered inner ring to replace the inner ring and reaction ring avoids the cumulative errors in the processing and assembly of the two parts;

[0020] The wall thickness of the bearing outer ring and the diameter of the tapered inner ring are quite different. The wall thickness of the tapered inner ring accounts for more than 30% of the cross-sectional size of the bearing, which enables the bearing to be directly connected to the plunger. At the same time, it has strong rigidity and can withstand greater impact loads. The bearing can overcome the defects of creep wear of the bearing inner diameter, excessive bearing temperature, and short life caused by the interference fit between the inner ring inner hole and the reaction ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural diagram of a deep groove ball bearing for a plunger oil pump of the utility model.

[0022] Figure 2 The utility model is an assembly structure diagram of the bearing in the plunger oil pump.

[0023] Figure 3 for Figure 2 Side view of the partial structure of the middle bearing assembly.

[0024] Figure 4 for Figure 3 Partial detail diagram.

[0025] In the figure, 1, outer ring, 2, inner ring, 3, cage, 4, steel ball, 3.1, cage seat, 3.2, cage cover, 5, rivet, 6, apex of the slope angle, 7, slope surface of the inner ring, 8, plunger, 9, plunger head, 9.1, center hole of the plunger head, 9.2, slope surface of the plunger head. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0027] Example 1

[0028] like Figure 1 The plunger oil pump deep groove ball bearing shown in the figure comprises: an outer ring 1, an inner ring 2, a retainer 3 and a plurality of steel balls 4; the plurality of steel balls 4 are evenly arranged between the raceway of the outer ring 1 and the raceway of the inner ring 2, and are distributed in a plurality of pockets of the retainer 3; the inner diameter of the inner ring 2 is a convex cone angle structure;

[0029] The cage 3 adopts a split two-body structure, including a cage seat 3.1 and a cage cover 3.2; the cage seat 3.1 and the cage cover 3.2 are correspondingly provided with rivet holes, and the cage seat 3.1 and the cage cover 3.2 are connected together through a rivet 5;

[0030] The convex cone angle structure is that the two ends of the inner diameter of the inner ring 2 form a slope angle approaching the center point of the bearing toward the middle direction; the intersection of the radial extension line of the center point of the bearing and the inner diameter of the inner ring 2 is the vertex 6 of the slope angle, which is also the convex cone angle point of the inner diameter of the inner ring;

[0031] The inner ring slope angle vertex 6 to the two ends of the inner diameter of the inner ring 2 are respectively inner ring slope surfaces 7, and the two slope surfaces 7 are symmetrical to each other with the inner ring slope angle vertex 6 as the center; the degree of each inner ring slope surface 7 is set to 10°.

[0032] As other embodiments of the present invention, Figure 2 , 3 As shown, the bearing is used in a plunger oil pump structure, and the technical concept adopted is: the inner hole of the bearing inner ring 2 is connected to the shaft of the oil pump through a plunger 8, and a rotor is arranged in the oil pump; the positions of the two slope surfaces 7 on the outer diameter of the shaft corresponding to the inner diameter of the inner ring 2 are respectively arranged along the circumference of the shaft with a row of plungers 8 of the same number; the head end of each row of plungers 8 is in contact with the slope surface 7 of the inner ring;

[0033] The number of plungers 8 in each row is set to 11, and the 22 plungers 8 in the two rows of plungers correspond to each other in pairs; the 22 plungers 8 extend out due to the centrifugal force and high-pressure oil when rotating;

[0034] Each plunger 8 is provided with a plunger head 9 at the front end, and 22 plunger heads 9 are connected to two slope surfaces 7 of the bearing inner ring 2. The bearing inner ring 2 rotates under the action of the plunger heads 9 extending and contacting. One slope surface 7 of the inner ring is contacted by 11 plunger heads 9, and the plunger heads 9 of the two slope surfaces 7 contact each other to produce axial forces that offset each other and are in a balanced state.

[0035] Each plunger head 9 is a truncated cone structure with a central hole 9.1, and the conical surface of the truncated cone is set as a slope surface 9.2 with a 10° angle; when the plunger 8 extends out and contacts the inner ring 2, the slope surface 9.2 of the plunger head and the slope surface 7 of the inner ring are in surface-to-surface contact;

[0036] In this embodiment, the plunger head 9 has a diameter of 14 mm and the center hole 9.1 has a diameter of 3 mm;

[0037] The distance between the contact surface between the plunger head 9 and the inner ring 2 and the vertex 6 of the inner ring slope angle (the tip of the convex cone angle of the inner diameter of the inner ring) is 1 mm; using the above-mentioned plunger oil pump bearing unit, when the rotor rotates, the plunger 8 is extended by the centrifugal force, and the 10° slope surface 9.2 of the plunger head 9 abuts against the 10° slope surface 7 of the bearing inner ring 2, forming a soft connection structure (the higher the pressure, the greater the abutment force); due to the soft connection structure, the speed of the bearing inner ring 2 is always slower than the rotor speed. At this time, the plunger 8 will produce self-rotation motion, and the 10° slope surface 9.2 of the plunger head 9 performs rolling friction motion on the 10° slope surface 7 of the bearing inner ring 2. The principle is similar to the movement of train wheels and rails, thereby reducing wear and heat.

[0038] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0040] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0042] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

Claims

1. A plunger oil pump deep groove ball bearing, characterized in that: include: An outer ring, an inner ring, a retainer and a plurality of steel balls; the plurality of steel balls are evenly arranged between the outer ring raceway and the inner ring raceway and distributed in a plurality of pockets of the retainer; the inner diameter of the inner ring is a convex cone angle structure.

2. A plunger oil pump deep groove ball bearing according to claim 1, characterized in that: The convex cone angle structure is that the two ends of the inner diameter of the inner ring form a slope angle approaching the center point of the bearing toward the middle direction; the intersection of the radial extension line of the bearing center point and the inner diameter of the inner ring is the vertex of the slope angle.

3. A plunger oil pump deep groove ball bearing according to claim 2, characterized in that: The inner circle slope angle vertex to the two ends of the inner circle inner diameter are respectively inner circle slope surfaces, and the two slope surfaces are symmetrical to each other with the inner circle slope angle vertex as the center.

4. A plunger oil pump deep groove ball bearing according to claim 3, characterized in that: The degree of each inner ring slope surface is set to 10°.

5. A plunger oil pump deep groove ball bearing according to claim 3, characterized in that: The inner diameter of the bearing inner ring is connected to the shaft of the oil pump through a plunger, and a rotor is arranged in the oil pump; the two slope surfaces on the outer diameter of the shaft corresponding to the inner diameter of the inner ring are respectively evenly distributed along the circumference of the shaft with a row of plungers of the same number; the head end of each row of plungers contacts the slope surface of the inner ring.

6. A plunger oil pump deep groove ball bearing according to claim 5, characterized in that: The number of plungers in each column is set to 11, and the 22 plungers in the two columns of plungers correspond to each other in pairs.

7. A plunger oil pump deep groove ball bearing according to claim 6, characterized in that: A plunger head is arranged at the front end of each plunger, and the 22 plunger heads are connected to the two slope surfaces of the inner ring of the bearing.

8. A plunger oil pump deep groove ball bearing according to claim 7, characterized in that: Each plunger head is a truncated cone structure with a central hole, and the conical surface of the truncated cone is set to a slope surface of 10°.

9. A plunger oil pump deep groove ball bearing according to claim 6, characterized in that: The distance between the contact surface between the plunger head and the inner ring and the vertex of the inner ring slope angle is 1 mm.

10. The deep groove ball bearing for a plunger oil pump according to claim 1, characterized in that: The wall thickness of the inner ring with convex cone angle accounts for more than 30% of the bearing cross-sectional size.

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