阅读说明：本技术 一种转子组件及其设计方法、转子泵和发动机总成 (Rotor assembly and design method thereof, rotor pump and engine assembly ) 是由 刘宏杰 曾超 王景新 刘伦伦 于 2020-06-24 设计创作，主要内容包括：本发明涉及泵技术领域,公开一种转子组件及其设计方法、转子泵和发动机总成,转子组件包括内转子和套设于内转子外的外转子,内转子和外转子之间的最小间隙c始终大于零,内转子的中心轴线与外转子的中心轴线平行且间隔设置；外转子的齿数＝内转子的齿数+1,内转子和外转子能分别在外力作用下绕自身轴线转动以在外转子和内转子之间形成体积变化的泵液腔。本发明中内转子和外转子分别绕自身轴线转动,以使内转子和外转子之间形成体积变化的泵液腔,由于内转子和外转子之间的最小间隙c始终大于零,内转子和外转子转动的过程中不会产生啮合接触,避免了内转子和外转子啮合运动引起的齿间磨损,解决了内转子和外转子啮合导致振动和噪声较大的问题。(The invention relates to the technical field of pumps and discloses a rotor assembly, a design method thereof, a rotor pump and an engine assembly, wherein the rotor assembly comprises an inner rotor and an outer rotor sleeved outside the inner rotor, the minimum clearance c between the inner rotor and the outer rotor is always larger than zero, and the central axis of the inner rotor and the central axis of the outer rotor are parallel and arranged at intervals; the number of teeth of outer rotor is equal to the number of teeth +1 of inner rotor, and inner rotor and outer rotor can rotate around self axis respectively under the exogenic action in order to form the pump liquid chamber that the volume changes between outer rotor and inner rotor. The inner rotor and the outer rotor respectively rotate around the axes of the inner rotor and the outer rotor so as to form a pump liquid cavity with variable volume between the inner rotor and the outer rotor, and because the minimum clearance c between the inner rotor and the outer rotor is always larger than zero, meshing contact cannot be generated in the rotating process of the inner rotor and the outer rotor, the abrasion between teeth caused by meshing motion of the inner rotor and the outer rotor is avoided, and the problem of larger vibration and noise caused by meshing of the inner rotor and the outer rotor is solved.)

1. The rotor assembly is characterized by comprising an inner rotor (9) and an outer rotor (8) sleeved outside the inner rotor (9), wherein the minimum clearance c between the inner rotor (9) and the outer rotor (8) is always larger than zero, and the central axis of the inner rotor (9) and the central axis of the outer rotor (8) are parallel and arranged at intervals;

the number of teeth of the outer rotor (8) is equal to the number of teeth +1 of the inner rotor (9), and the inner rotor (9) and the outer rotor (8) can rotate around the axis of the inner rotor under the action of external force respectively so as to form a pump liquid cavity with variable volume between the outer rotor (8) and the inner rotor (9).

2. The rotor assembly according to claim 1, wherein the outer rotor (8) includes a plurality of concave teeth (84) formed on an inner circumferential surface thereof, and the inner rotor (9) includes a plurality of convex teeth (92) formed on an outer circumferential surface thereof and insertable into the concave teeth (84).

3. A method of designing a rotor assembly as claimed in claim 1 or 2, comprising the steps of:

step A, obtaining an equation of an inscribed cycloidal line (10),

step B, taking the equation of the inscribed cycloidal line (10) as a normal equidistant curve with the distance d to obtain an expression of an outer contour line (91) of the inner rotor (9)

Step C, taking the intersection point of the first auxiliary circle and the inscribed circle cycloid (10) as the center of a circle as the radius R₄Obtaining an expression of a first inner contour line (81) of the outer rotor (8)

With R₅Making a third auxiliary circle concentric with the second base circle for the radius to obtain an expression of a second inner contour line (82) of the outer rotor (8)Wherein A is the center distance between the first base circle and the second base circle;

and D, acquiring the inner contour of the outer rotor (8) according to the expression of the first inner contour (81) and the expression of the second inner contour (82).

4. A method of designing a rotor assembly according to claim 3, wherein the obtaining an inner contour of the outer rotor (8) according to an expression of the first inner contour (81) and an expression of the second inner contour (82) comprises:

circumferentially arrayed on a first inner contour line (81) at angular intervals of (360 °/(number of teeth of inner rotor +1)) with points (0, -a) as the center of the circle;

the closed curve formed by the intersection of the second inner contour line (82) and the arrayed first inner contour line (81) and taking the point (0, -A) as the center of a circle is the inner contour line of the outer rotor (8).

5. A rotodynamic pump comprising the rotor assembly of claim 1 or 2.

6. A rotor pump according to claim 5, characterized in that it further comprises a first shaft (6) and a second shaft (7) arranged in parallel and capable of rotating around their axes respectively, said first shaft (6) being provided with said outer rotor (8) fixed relative thereto and coaxial therewith, said second shaft (7) being provided with said inner rotor (9) fixed relative thereto and coaxial therewith;

the ratio of the rotational speed of the first shaft (6) to the rotational speed of the second shaft (7) is equal to the number of teeth of the inner rotor (9)/the number of teeth of the outer rotor (8).

7. A rotodynamic pump according to claim 6, further comprising a third shaft (5) parallel to the first shaft (6) and rotatable about its own axis, the third shaft (5) being provided with a first gear (1) and a second gear (2) fixed with respect thereto;

the first shaft (6) is provided with a third gear (3) which is fixed relative to the first shaft and is meshed with the first gear (1), and the second shaft (7) is provided with a fourth gear (4) which is fixed relative to the second shaft and is meshed with the second gear (2).

8. A rotodynamic pump according to claim 7, wherein the first gear (1) and the third gear (3) have a gear ratio i₁The transmission ratio of the second gear (2) to the fourth gear (4) is i₂The number of teeth of the inner rotor (9) is n, i₁/i₂＝(n+1)/n。

9. A rotor pump according to claim 6, characterized in that the outer rotor (8) is provided with a mounting groove (83) on one side for mounting the inner rotor (9), the first shaft (6) being connected to the other side of the outer rotor (8).

10. An engine assembly comprising a rotodynamic pump of any one of claims 5 to 9.

Technical Field

The invention relates to the technical field of pumps, in particular to a rotor assembly, a design method of the rotor assembly, a rotor pump and an engine assembly.

Background

The rotor oil pump is generally applied in the engine industry, and comprises an inner rotor and an outer rotor which is sleeved outside the inner rotor and meshed with the inner rotor, wherein the inner rotor is driven by external force to rotate, and the outer rotor is driven by the inner rotor to rotate, so that the oil pumping function is realized.

However, in the process of meshing the inner rotor and the outer rotor, the inter-tooth abrasion is easily generated between the inner rotor and the outer rotor, so that the vibration and the noise of the oil pump are increased, the sealing performance of the oil pump is easily reduced, and the reliability of the oil pump is influenced.

Disclosure of Invention

The invention aims to provide a rotor assembly, a design method thereof, a rotor pump and an engine assembly, which can reduce the abrasion between an inner rotor and an outer rotor and improve the reliability of the rotor pump.

In order to achieve the purpose, the invention adopts the following technical scheme:

a rotor assembly comprises an inner rotor and an outer rotor sleeved outside the inner rotor, wherein the minimum clearance c between the inner rotor and the outer rotor is always larger than zero, and the central axis of the inner rotor and the central axis of the outer rotor are parallel and arranged at intervals;

the number of teeth of the outer rotor is equal to the number of teeth +1 of the inner rotor, and the inner rotor and the outer rotor can rotate around the axis of the inner rotor under the action of external force respectively so as to form a pump liquid cavity with variable volume between the outer rotor and the inner rotor.

As a preferable mode of the rotor assembly, the outer rotor includes a plurality of concave teeth formed on an inner circumferential surface thereof, and the inner rotor includes a plurality of convex teeth formed on an outer circumferential surface thereof and capable of being inserted into the concave teeth.

The invention also provides a design method of the rotor assembly, which comprises the following steps:

step A, obtaining an equation of an inscribed cycloidal,where t is a parameter coordinate with point O as the origin, R₂Is the radius of a first base circle having a center at the point O, R₁Is the radius of a second base circle inscribed in the first base circle, R₃Is the radius of a first auxiliary circle concentric with the second base circle;

step B, taking the equation of the inscribed cycloidal as a normal equidistant curve with the distance d to obtain an outer contour line expression of the inner rotor

Step C, taking the intersection point of the first auxiliary circle and the inscribed cycloidal as the center of a circle as the radius R₄Obtaining an expression of a first inner contour line of the outer rotor

Wherein R is₄＝d-c；

With R₅Making a third auxiliary circle concentric with the second base circle for the radius to obtain an expression of a second inner contour line of the outer rotor

Wherein A is the center distance between the first base circle and the second base circle;

and D, acquiring the inner contour of the outer rotor according to the expression of the first inner contour and the expression of the second inner contour.

As a preferable aspect of the method of designing a rotor assembly described above, the obtaining an inner contour of an outer rotor according to an expression of a first inner contour and an expression of a second inner contour includes:

circumferentially arrayed on the first inner contour line at angular intervals of (360 °/(number of teeth of inner rotor +1)) with the points (0, -a) as the center of the circle;

and a closed curve formed by intersecting the second inner contour line with the first inner contour line after the array and taking a point (0, -A) as a circle center is an inner contour line of the outer rotor.

The invention also provides a rotor pump which comprises the rotor assembly.

As a preferred technical scheme of the above rotor pump, the rotor pump further comprises a first shaft and a second shaft which are arranged in parallel and can respectively rotate around the axes of the first shaft and the second shaft, wherein the first shaft is provided with the outer rotor which is fixed relative to the first shaft and is coaxial with the first shaft, and the second shaft is provided with the inner rotor which is fixed relative to the second shaft and is coaxial with the second shaft;

the ratio of the rotational speed of the first shaft to the rotational speed of the second shaft is equal to the number of teeth of the inner rotor/the number of teeth of the outer rotor.

As a preferable technical solution of the above rotor pump, the rotor pump further comprises a third shaft parallel to the first shaft and capable of rotating around its own axis, and the third shaft is provided with a first gear and a second gear fixed relative to the third shaft;

the first shaft is provided with a third gear which is fixed relative to the first shaft and is meshed with the first gear, and the second shaft is provided with a fourth gear which is fixed relative to the second shaft and is meshed with the second gear.

As a preferable embodiment of the above rotor pump, a gear ratio of the first gear and the third gear is i₁The transmission ratio of the second gear to the fourth gear is i₂The number of teeth on the inner rotor is n, i₁/i₂＝(n+1)/n。

As a preferable technical solution of the above rotor pump, a mounting groove for mounting the inner rotor is provided on one side of the outer rotor, and the first shaft is connected to the other side of the outer rotor.

The invention also provides an engine assembly comprising the rotor assembly.

The invention has the beneficial effects that: the rotor assembly provided by the invention controls the inner rotor and the outer rotor to rotate around the axes of the inner rotor and the outer rotor respectively through external force so as to form a pump liquid cavity with variable volume between the inner rotor and the outer rotor.

The design method of the rotor assembly provided by the invention can ensure that the inner rotor and the outer rotor are not contacted, and solves the problem of inter-tooth abrasion caused by meshing motion of the inner rotor and the outer rotor.

The rotor pump and the engine assembly provided by the invention both comprise the rotor assembly, so that the noise in the working process is reduced, the reliability is improved, and the service life is prolonged.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.

Fig. 1 is a schematic structural view of a rotor assembly provided in an embodiment of the present invention;

FIG. 2 is an enlarged partial schematic view at G of FIG. 1;

FIG. 3 is a schematic structural diagram of a rotor pump according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of an outer rotor according to an embodiment of the present invention;

fig. 5 is a schematic diagram of deriving a first inner profile expression, a second inner profile expression, and a profile expression of an outer rotor according to an embodiment of the present invention.

In the figure:

1. a first gear; 2. a second gear; 3. a third gear; 4. a fourth gear; 5. a third axis; 6. a first shaft; 7. a second shaft;

8. an outer rotor; 81. a first inner contour; 82. a second inner contour; 83. mounting grooves; 84. concave teeth;

9. an inner rotor; 91. an outer contour line; 92. a convex tooth;

10. an inscribed circle cycloid.

Detailed Description

In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.

As shown in fig. 1 and 2, the present embodiment provides a rotor assembly, which includes an inner rotor 9 and an outer rotor 8 sleeved outside the inner rotor 9, wherein a minimum gap c between the inner rotor 9 and the outer rotor 8 is always greater than zero, and a central axis of the inner rotor 9 is parallel to and spaced from a central axis of the outer rotor 8; the number of teeth of the outer rotor 8 is equal to the number of teeth +1 of the inner rotor 9, and the inner rotor 9 and the outer rotor 8 can rotate around the axes thereof under the action of external force, so that a pump liquid cavity with variable volume is formed between the outer rotor 8 and the inner rotor 9. As regards the minimum clearance c, it can be determined from a number of repeated tests that require the function of pumping the liquid during the rotation of the inner rotor 9 and the outer rotor 8 around their axes.

In the embodiment, the inner rotor 9 and the outer rotor 8 are controlled to rotate around the axes of the inner rotor and the outer rotor respectively through external force, so that a pump liquid cavity with variable volume is formed between the inner rotor 9 and the outer rotor 8, and as the minimum clearance c between the inner rotor 9 and the outer rotor 8 is always larger than zero, meshing contact cannot be generated in the rotating process of the inner rotor 9 and the outer rotor 8, so that the inter-tooth abrasion caused by meshing motion of the inner rotor 9 and the outer rotor 8 is avoided, and the problems of vibration and large noise caused by meshing of the inner rotor 9 and the outer rotor 8 are solved.

Further, the outer rotor 8 includes a plurality of concave teeth 84 (refer to fig. 4) formed on an inner circumferential surface thereof, and the inner rotor 9 includes a plurality of convex teeth 92 formed on an outer circumferential surface thereof and capable of being inserted into the concave teeth 84. The number of concave teeth 84 is the number of teeth of outer rotor 8, and the number of convex teeth 92 is the number of teeth of inner rotor 9.

As shown in fig. 3, the present embodiment also provides a rotor pump including the rotor assembly described above. The abrasion between teeth caused by the meshing motion of the inner rotor 9 and the outer rotor 8 is avoided, the reliability of the rotor pump is improved, and the service life of the rotor pump is prolonged.

Furthermore, the rotor pumps are arranged in parallel and can respectively rotate around the axes of the first shaft 6 and the second shaft 7, wherein the first shaft 6 is provided with an outer rotor 8 which is fixed relative to the first shaft and coaxial with the first shaft, and the second shaft 7 is provided with an inner rotor 9 which is fixed relative to the second shaft and coaxial with the second shaft; the ratio of the rotational speed of the first shaft 6 to the rotational speed of the second shaft 7 is equal to the number of teeth of the inner rotor 9/the number of teeth of the outer rotor 8.

The outer rotor 8 is driven to rotate by the rotation of the first shaft 6, the inner rotor 9 is driven to rotate by the rotation of the second shaft 7, and therefore the inner rotor 9 and the outer rotor 8 rotate around the axes of the inner rotor and the outer rotor respectively, and a pump liquid cavity with variable volume is formed between the outer rotor 8 and the inner rotor 9.

Furthermore, the rotor pump also comprises a third shaft 5 which is parallel to the first shaft 6 and can rotate around the axis of the third shaft, and the third shaft 5 is provided with a first gear 1 and a second gear 2 which are fixed relative to the third shaft; the first shaft 6 is provided with a third gear 3 fixed relative thereto and meshing with the first gear 1, and the second shaft 7 is provided with a fourth gear 4 fixed relative thereto and meshing with the second gear 2.

One of the first shaft 6, the second shaft 7 and the third shaft 5 can be connected with an external driving force, so that the rotation of the other two shafts can be realized, the rotation of the inner rotor 9 and the outer rotor 8 around the central axis of the two shafts is realized, only one driving is needed, and the cost of the rotor pump is reduced. It should be noted that, the present invention is not limited to the above power transmission manner, and only needs to satisfy the requirement that the first shaft 6 and the second shaft 7 can rotate around their own axes, respectively.

Further, the first gear 1 and the third gear 3 have a gear ratio i₁The transmission ratio of the second gear 2 to the fourth gear 4 is i₂The number of teeth of the inner rotor 9 is n, requirement i₁/i₂(n +1)/n by the pair i₁/i₂Is defined so as to avoid interference during the rotation of the inner rotor 9 and the outer rotor 8 around their axes.

Further, as shown in fig. 4, an installation groove 83 for installing the inner rotor 9 is provided on one side of the outer rotor 8, and the first shaft 6 is connected to the other side of the outer rotor 8. The mounting groove 83 is provided as a counter bored structure to facilitate mounting of the first shaft 6. In the present embodiment, the outer rotor 8 and the first shaft 6 are interference-fitted. In other embodiments, the first shaft 6 and the outer rotor 8 may be integrally provided. As for the third gear 3 and the first shaft 6, they may be integrally provided, or the third gear 3 may be mounted on the first shaft 6 by interference fit, key, or the like, and is not limited in detail here.

In this embodiment, the inner rotor 9 and the second shaft 7 are in interference fit, and in other embodiments, the inner rotor 9 and the second shaft 7 may be integrally provided, or the fourth gear 4 may be mounted on the second shaft 7 by interference fit or key, and the present invention is not limited in detail.

The first gear 1 and the second gear 2 may be mounted on the second shaft 7 by interference fit, integral arrangement, key, or the like, and are not limited in detail here.

As shown in fig. 5, the present embodiment further provides an engine assembly, which includes the above-mentioned rotary pump, and reduces noise of the engine assembly, and improves reliability of the engine assembly.

The present embodiment further provides a method for designing the rotor assembly, including the following steps:

step A, obtaining an equation of an inscribed cycloidal 10,where t is a parameter coordinate with point O as the origin, R₂Is the radius of a first base circle having a center at the point O, R₁Is the radius of a second base circle inscribed in the first base circle, R₃Is the radius of a first auxiliary circle concentric with the second base circle;

step B, the equation of the inscribed cycloidal line 10 is used as a normal equidistant curve with the distance d to obtain the normal equidistant curve of the inner rotor 9Outer contour line 91 expression

Step C, taking the intersection point of the first auxiliary circle and the inscribed cycloid 10 as the center of a circle as the radius R₄The expression of the first inner contour 81 of the outer rotor 8 is obtainedWherein R is₄D-c; with R₅A third auxiliary circle concentric with the second base circle is made for the radius, resulting in an expression for the second inner contour 82 of the outer rotor 8Wherein A is the center distance between the first base circle and the second base circle;

and step D, acquiring the inner contour of the outer rotor 8 according to the expression of the first inner contour 81 and the expression of the second inner contour 82.

The above-described method of obtaining the inner contour of outer rotor 8 from the expression of first inner contour 81 and the expression of second inner contour 82 includes the steps of:

(1) performing a circumferential array of the first inner contour 81 with the point (0, -A) as the center and the angular interval of (360 °/(n + 1));

(2) the closed curve formed by the intersection of the second inner contour line 82 and the arrayed first inner contour line 81 and having the point (0, -a) as the center is the inner contour line of the outer rotor 8.

In another embodiment, (360 °/(n +1)) first inner contour lines 81 may be formed in step C by an array, and in step E, a closed curve formed by intersecting the (360 °/(n +1)) first inner contour lines 81 and the second inner contour lines 82 and centered at a point (0, -a) may be used as the inner contour line of the outer rotor 8.

It should be noted that the equation of the inscribed cycloidal 10 in step a is prior art, and a, d, and R are described above₁、R₂、R₃、R₄And R₅Are known values determined according to actual requirements, andwhat is needed is a normal equidistant curve with a distance d according to the equation of the inscribed cycloid 10 to obtain the corresponding curve, i.e. the expression of the outer contour line 91 of the inner rotor 9, is the prior art and is not described in detail herein.

The design method of the rotor assembly provided by the embodiment can ensure that the inner rotor 9 and the outer rotor 8 are not contacted, and solves the problem of inter-tooth abrasion caused by the meshing motion of the inner rotor 9 and the outer rotor 8.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.