Gear transmission structure of motor pump

Abstract

The utility model provides a gear transmission structure of a motor pump, and belongs to the technical field of high-pressure cleaning machines. The problems that an existing gear transmission structure is large in size and heavy in weight are solved. The gear transmission structure of the motor pump comprises an oil cylinder, an inner gear, a pinion and a gear shaft, the inner gear, the pinion and the gear shaft are all arranged in the oil cylinder, a disc-shaped inner gear connecting part is arranged in the middle of the gear shaft, the inner gear connecting part is provided with an inner gear matching outer circle, the inner gear is annular, the inner gear matching outer circle is sleeved with the upper end of the inner gear, and the inner gear is provided with an inner tooth face. And the pinion is meshed with the inner tooth surface of the inner gear. The installation position of the small gear of the structure is reliable and moves by a certain distance, so that the design of the whole transmission structure is more compact, the size is reduced, and the weight is reduced; the contact area between the matched outer circle of the inner gear and the inner gear is large, and the inner gear can bear larger load.

Description

TECHNICAL FIELD

[0001] The utility model belongs to high pressure cleaning machine technical field, especially a gear transmission structure of motor pump. BACKGROUND

[0002] In high pressure cleaning equipment, motor pump gear transmission system is the core component of realizing power transmission and pressure conversion, and the power system of traditional high pressure cleaning machine is usually composed of motor, speed reducer and pump body, and the performance directly influences the working efficiency, noise level and reliability of equipment. At present, a kind of inner gear and internal meshing transmission structure is disclosed in China patent network

authorized publication number: CN209228957U

[0003] The above-mentioned inner gear and internal meshing transmission structure has the following defects: 1, the size of inner gear is larger, so that the weight of inner gear is heavier, the load of motor is large during work, the working efficiency of motor pump is influenced, especially handheld lithium battery motor pump, the power of motor pump is low itself, the load generated by the large weight of inner gear will have greater influence on the efficiency of motor pump;2, inner gear has inner tooth fixing ring part sleeved on driven shaft, one end of inner tooth fixing ring part is close to second bearing, and outer gear is arranged between inner tooth fixing ring part and tooth profile part of inner gear, since inner tooth fixing ring part has a certain thickness, in order to accommodate outer gear, the outer diameter of inner gear is set larger, so that the center distance between outer gear and inner gear is larger, the volume of transmission structure is larger, and the weight is large. UTILITY MODEL CONTENTS

[0004] The utility model aims at the above-mentioned problems existing in prior art, and proposes a kind of gear transmission structure of motor pump, and the technical problems to be solved by the utility model are: how to solve the problem of large volume and heavy weight of gear transmission structure.

[0005] The purpose of the utility model can be realized by the following technical schemes:

[0006] A kind of gear transmission structure of motor pump, including oil cylinder, inner gear, pinion and gear shaft all being arranged in oil cylinder, it is characterized in that, the middle part of the gear shaft has the inner gear connecting portion that is disc-shaped, the inner gear connecting portion has inner gear matching outer circle, the inner gear is annular, the upper end of the inner gear is sleeved on inner gear matching outer circle, the inner gear has inner tooth surface, the pinion is engaged with the inner tooth surface of inner gear.

[0007] The structure sets the internal gear connecting part on the gear shaft, and then sets the internal gear on the ring, and the internal gear does not have the internal tooth fixing ring part compared with the internal gear of the prior art, and the internal tooth fixing ring occupies the space between the internal gear and the gear shaft, and then the outer diameter of the internal gear connecting part is designed to be slightly smaller in design, and then the size of the internal gear is also correspondingly smaller, and the pinion is arranged on the inner side of the internal gear, and since the internal tooth fixing occupies the space, the pinion mounting position of the structure is reliably moved by a certain distance compared with the pinion mounting position of the prior art, so that the design of the whole transmission structure is more compact, the volume is smaller, and the weight is lighter; the contact area of the internal gear cooperating with the external circle and the internal gear is large, and the internal gear can bear larger load.

[0008] In the gear transmission structure of the motor pump, the gear shaft and the internal gear connecting part are integrally formed, and the gear shaft and the internal gear connecting part are made of aluminum material. The gear shaft is made of light aluminum material, so that the efficiency decline caused by weight increase can be well solved; in addition, the gear shaft and the internal gear connecting part of the structure can also be made of light materials other than aluminum.

[0009] In the gear transmission structure of the motor pump, the upper end of the internal gear has a mounting hole, the mounting hole is tightly matched with the internal gear cooperating outer circle, the inner circumferential surface of the lower part of the internal gear has an annular thickening part, and the internal tooth surface is arranged on the inner circumferential surface of the thickening part. When the internal gear is assembled, the thickening part can abut against the internal gear connecting part, the thickening part plays a limiting role, and the internal tooth surface is also provided.

[0010] In the gear transmission structure of the motor pump, the gear shaft has a first bearing cooperating outer circle and a first bearing limiting surface located below the first bearing cooperating outer circle, the first bearing is sleeved on the first bearing cooperating outer circle, and the first bearing abuts against the first bearing limiting surface, and the first bearing is fixed in the oil cylinder.

[0011] In the gear transmission structure of the motor pump, the gear shaft has a second bearing cooperating outer circle and a second bearing limiting surface located above the second bearing cooperating outer circle, the second bearing is sleeved on the second bearing cooperating outer circle, and the second bearing abuts against the second bearing limiting surface, and the second bearing is fixed in the oil cylinder.

[0012] In the gear transmission structure of the motor pump, the gear shaft includes an extension pin which is detachably arranged on the gear shaft, and the outer circumferential surface of the extension pin is a second bearing cooperating outer circle.

[0013] Compared with the prior art, the gear transmission structure of the motor pump has the following advantages: the inner gear connecting portion is arranged on the gear shaft, and then the inner gear is arranged as a ring-shaped piece, the inner gear does not have an inner tooth fixing ring portion compared with the prior art, the space between the inner gear and the gear shaft is not occupied by the inner tooth fixing ring, and then the outer diameter of the inner gear connecting portion is designed to be slightly smaller in design, and the size of the inner gear is also correspondingly smaller, the pinion is arranged on the inner side of the inner gear, and since the space is not occupied by the inner tooth fixing, the mounting position of the pinion of the structure can be reliably moved by a certain distance compared with the mounting position of the pinion of the prior art, so that the design of the entire transmission structure is more compact, the volume is smaller, and the weight is lighter; the contact area of the inner gear fitting outer circle and the inner gear is large, and the inner gear can bear greater load. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a cross-sectional structure schematic view of the utility model.

[0015] Figure 2 is a three-dimensional structure schematic view of the gear shaft of the utility model.

[0016] Figure 3 is a three-dimensional structure schematic view of the inner gear of the utility model.

[0017] Figure 4 is a three-dimensional structure schematic view of the gear shaft of the embodiment 2 of the utility model.

[0018] In the figure, 1, oil cylinder; 2, inner gear; 20, inner tooth surface; 21, mounting hole; 22, thickening portion; 3, pinion; 4, gear shaft; 40, inner gear connecting portion; 41, inner gear fitting outer circle; 42, first bearing fitting outer circle; 43, first bearing limiting surface; 44, second bearing fitting outer circle; 45, second bearing limiting surface; 5, first bearing; 6, second bearing. DETAILED DESCRIPTION

[0019] The following is a specific embodiment of the utility model and further describes the technical scheme of the utility model in combination with the drawings, but the utility model is not limited to these embodiments.

[0020] Embodiment 1

[0021] As Figure 1 , Figure 2 and Figure 3As shown, the gear transmission structure of the motor pump includes a cylinder 1, an internal gear 2, a pinion 3 and a gear shaft 4, which are all arranged in the cylinder 1. The middle part of the gear shaft 4 has a disc-shaped internal gear connecting part 40, which has an internal gear matching outer circle 41. The internal gear 2 is annular, and the upper end of the internal gear 2 is sleeved on the internal gear matching outer circle 41. The internal gear 2 has an internal tooth surface 20, and the pinion 3 is engaged with the internal tooth surface 20 of the internal gear 2. The structure sets the internal gear connecting part 40 on the gear shaft 4, and then sets the internal gear 2 as an annular part. Compared with the internal gear in the prior art, the internal gear 2 does not have an internal tooth fixing ring part. The space between the internal gear 2 and the gear shaft 4 is occupied by the internal tooth fixing ring part. Therefore, the outer diameter of the internal gear connecting part 40 is designed to be slightly smaller in the design, and the size of the internal gear 2 is also correspondingly smaller. The pinion 3 is arranged on the inner side of the internal gear 2. Since the space is not occupied by the internal tooth fixing ring part, compared with the mounting position of the pinion in the prior art, the mounting position of the pinion 3 in the structure can be reliably moved by a certain distance. This makes the design of the entire transmission structure more compact, smaller in size and lighter in weight. The contact area between the internal gear matching outer circle 41 and the internal gear 2 is large, and the internal gear 2 can bear greater load.

[0022] As shown in Figure 2 , the gear shaft 4 and the internal gear connecting part 40 are integrally formed. The gear shaft 4 and the internal gear connecting part 40 are both made of aluminum material. The gear shaft 4 uses aluminum material with lighter weight, which can well solve the problem of efficiency reduction caused by weight increase. In addition, the gear shaft 4 and the internal gear connecting part 40 of the structure can also use other lightweight materials except aluminum. Figure 3 As shown in Figure 2 , the upper end of the internal gear 2 has a mounting hole 21, which is tightly matched with the internal gear matching outer circle 41. The inner circumferential surface of the lower part of the internal gear 2 has an annular thickening part 22, and the internal tooth surface 20 is arranged on the inner circumferential surface of the thickening part 22. The thickening part 22 plays a limiting role during assembly of the internal gear 2, and also provides the internal tooth surface 20.

[0023] As shown in Figure 2 , the gear shaft 4 has a first bearing matching outer circle 42 and a first bearing limiting surface 43 located below the first bearing matching outer circle 42. A first bearing 5 is arranged in the cylinder, and the first bearing 5 is sleeved on the first bearing matching outer circle 42 and abuts against the first bearing limiting surface 43. The gear shaft 4 has a second bearing matching outer circle 44 and a second bearing limiting surface 45 located above the second bearing matching outer circle 44. A second bearing 6 is arranged in the cylinder 1, and the second bearing 6 is sleeved on the second bearing matching outer circle 44 and abuts against the second bearing limiting surface 45. The second bearing 6 is fixed in the cylinder 1.

[0024] Example 2

[0025] This embodiment is basically the same as the content of the above-described embodiment 1, with the difference that, as shown in Figure 4 The gear shaft 4 includes an extension pin 7 detachably provided on the gear shaft 4, and an outer circumferential surface of the extension pin 7 is the second bearing fitting outer circle 44.

[0026] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

Claims

1. A gear transmission structure of an electric motor pump comprising a cylinder (1), an internal gear (2), a pinion (3) and a gear shaft (4) each of which is arranged in the cylinder (1), characterized in that, The middle part of the gear shaft (4) has a disc-shaped internal gear connecting part (40) with an internal gear matching outer circle (41), the internal gear (2) is annular, the upper end of the internal gear (2) is sleeved on the internal gear matching outer circle (41), the internal gear (2) has an internal tooth surface (20), and the pinion (3) is engaged with the internal tooth surface (20) of the internal gear (2).

2. A gear drive structure for a motor pump according to claim 1, wherein The gear shaft (4) is integrally formed with the internal gear connecting part (40).

3. A gear drive structure for a motor pump according to claim 1, wherein The upper end of the internal gear (2) has a mounting hole (21) which is tightly matched with the internal gear matching outer circle (41), and the lower part of the internal gear (2) has an annular thickened part (22) on the inner circumferential surface, and the internal tooth surface (20) is arranged on the inner circumferential surface of the thickened part (22).

4. A gear drive structure for a motor pump according to claim 1, wherein The gear shaft (4) has a first bearing matching outer circle (42) and a first bearing limiting surface (43) below the first bearing matching outer circle (42), the oil cylinder is provided with a first bearing (5), the first bearing (5) is sleeved on the first bearing matching outer circle (42), and the first bearing (5) abuts against the first bearing limiting surface (43).

5. A gear drive structure for a motor pump according to claim 1, wherein The gear shaft (4) has a second bearing matching outer circle (44) and a second bearing limiting surface (45) above the second bearing matching outer circle (44), the oil cylinder (1) is provided with a second bearing (6), the second bearing (6) is sleeved on the second bearing matching outer circle (44), and the second bearing (6) abuts against the second bearing limiting surface (45), and the second bearing (6) is fixed in the oil cylinder (1).

6. A gear drive structure for a motor pump according to claim 5, wherein The gear shaft (4) comprises an extension pin (7) which is detachably arranged on the gear shaft (4), and the outer circumferential surface of the extension pin (7) is the second bearing matching outer circle (44).

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