CN220775522U - Motor for electric hydraulic excavator - Google Patents

Abstract

The utility model discloses a motor for an electro-hydraulic excavator, which relates to the technical field of motors for electro-hydraulic excavators, and comprises an outer shell; the inner shell is arranged in the outer shell, and a flow channel is formed between the inner shell and the outer shell; a stator disposed within the outer housing; the rotor is arranged in the stator; the main shaft is used for supporting the rotor, the inside of the main shaft is of a hollow structure, and the flow channel is communicated with the hollow structure inside the main shaft; the combined sealing parts are respectively arranged at the joints of the left side and the right side of the main shaft and the inner shell. According to the utility model, under the condition of high rotation speed, most of oil in the first sealing element is prevented from leaking inwards under the action of centrifugal force, and only a small part of oil reaches the lip of the second sealing element through the gap to play a role in lubrication; and when the motor is in a low-rotation-speed or stop state, the second sealing piece can prevent a large amount of oil from entering the inside of the shell, so that the damage to internal elements caused by the large amount of oil entering the inside of the motor is avoided.

Description

Motor for electric hydraulic excavator

Technical Field

The utility model relates to the technical field of motors for electro-hydraulic excavators, in particular to a motor for an electro-hydraulic excavator.

Background

The excavator is used as important equipment in engineering construction, plays an extremely important role in construction such as industrial and civil buildings, transportation, hydraulic and electric engineering, mine mining, military engineering and the like, and is widely applied to the related engineering field.

In a conventional excavator, an internal combustion engine drives a hydraulic main pump, the hydraulic main pump outputs high-pressure hydraulic oil, and the excavator is driven to work through a hydraulic system. In the electric hydraulic excavator, the driving motor is adopted to replace the traditional fuel engine, the motor is connected with the main pump, a sealing structure is usually arranged at the joint of the motor and the main pump, for example, the pump cover external sealing type power sealing pump disclosed in Chinese patent publication No. CN201025271Y is adopted, after a period of use, the sealing sleeve is used for driving oil to rise temperature and pressure due to the rotation of the motor, so that the oil can leak into a motor cavity through a sealing surface, even if a new sealing mechanism is replaced, the same leakage phenomenon can occur in a short time, a lifting tool is required to be used for replacing the sealing mechanism, the time is consumed for a long time, and at least two workers are required to be matched with each other, and the electric hydraulic excavator is very time-consuming and labor-consuming.

Disclosure of Invention

In order to solve the technical problems, the utility model provides a motor for an electro-hydraulic excavator.

In order to achieve the above purpose, the present utility model provides the following technical solutions: an electric motor for an electro-hydraulic excavator, comprising:

an outer housing;

the inner shell is arranged in the outer shell and forms a flow passage with the outer shell;

a stator disposed within the outer housing;

a rotor disposed within the stator; and

the main shaft is used for supporting the rotor, the inside of the main shaft is of a hollow structure, and the flow channel is communicated with the hollow structure inside the main shaft;

the combined sealing part is arranged at the joint of the main shaft and the inner shell, and the left end and the right end of the main shaft are respectively connected with the inner shell through bearings;

the combined sealing part comprises a first sealing element and a second sealing element, the bearing is positioned on the outer side of the rotor, the first sealing element and the second sealing element are sequentially arranged at one end, close to the rotor, of the bearing, the first sealing element is communicated with the second sealing element, the first sealing element comprises an upper sealing ring and a lower sealing ring which are matched, the upper sealing ring is arranged on the inner surface of the inner shell, and the lower sealing ring is arranged on the main shaft in a surrounding mode; the second sealing piece comprises a metal framework and a sealing layer, the sealing layer is wrapped on the outer side of the metal framework, a spring lip which inclines towards a main shaft is arranged at one end, close to the first sealing piece, of the metal framework, and a clamping spring is arranged on the outer surface, close to the metal framework, of the spring lip.

Further, the lower end of the upper sealing ring is provided with a tooth-shaped structure, and the outer surface of the lower sealing ring is provided with a tooth-shaped structure staggered with the upper sealing ring.

Further, a sealing ring is arranged between the main shaft and the spring lip protector, and the spring lip protector is connected with the sealing ring.

Further, an oil suction port is formed in the outer shell, and the oil suction port is communicated with the runner.

Further, the front end of the outer shell is connected with a pump shell, a pump shaft is arranged in the pump shell, the main shaft is connected with the pump shaft, and an oil drain hole is formed in the pump shell.

Furthermore, the joint of the left side and the right side of the main shaft and the inner shell is respectively provided with one combined sealing part.

Further, the metal framework is a circular framework.

In summary, compared with the prior art, the utility model has the following beneficial technical effects:

according to the motor for the electro-hydraulic excavator, the first sealing piece and the second sealing piece are arranged to seal, so that oil is effectively prevented from leaking into a motor cavity through the joint of the pump shell and the outer shell, under the condition of high rotating speed, the oil in the first sealing piece forms a stable oil film and a local pressure extremum under the action of centrifugal force, most of the oil is prevented from leaking inwards, and only a small part of the oil reaches the lip of the second sealing piece through a gap to play a role in lubrication; and when the motor is in a low-rotation-speed or stop state, the second sealing piece can prevent a large amount of oil from entering the inside of the shell, so that the damage to internal elements caused by the large amount of oil entering the inside of the motor is avoided. The oil is sealed by the first sealing element, so that the leakage quantity reaching the second sealing element side is small and the pressure is low, the compression quantity of the skeleton seal of the second sealing element can be properly reduced, and the lip aging caused by rapid temperature rise under a wide rotating speed is avoided, thereby prolonging the sealing life.

Drawings

FIG. 1 is a schematic cross-sectional view of the present utility model;

FIG. 2 is an enlarged schematic view of the structure of FIG. 1A;

fig. 3 is a schematic cross-sectional view of a second seal member according to the present utility model.

Wherein, 1, the outer shell; 2. an inner housing; 3. a stator; 4. a rotor; 5. a main shaft; 6. a flow passage; 7. a combined sealing part; 701. an upper sealing ring; 702. a lower sealing ring; 71. a second seal; 713. a metal skeleton; 714. a sealing layer; 715. a spring lip; 716. a clamping spring; 717. a seal ring; 8. a bearing; 9. an oil suction port; 10. a pump housing; 11. a pump shaft; 12. and an oil drain hole.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Example 1

Referring to fig. 1, a motor for an electro-hydraulic excavator includes: an outer case 1; an inner housing 2 disposed in the outer housing 1 and forming a flow passage 6 with the outer housing 1; a stator 3 disposed in the outer case 1; a rotor 4 disposed within the stator 3; and a main shaft 5 for supporting the rotor 4, wherein the interior of the main shaft 5 is a hollow structure, and the flow channel 6 is communicated with the hollow structure in the interior of the main shaft 5; and the combined sealing parts 7 are respectively arranged at the connection parts of the left side and the right side of the main shaft 5 and the inner shell 2, and the combined sealing parts 7 are respectively arranged at the connection parts of the left side and the right side of the main shaft 5 and the inner shell 2.

Specifically, the left end and the right end of the main shaft 5 are respectively connected with the inner shell 2 through bearings 8;

referring to fig. 2, the combined seal 7 includes a first seal member provided at an end of the bearing 8 near the rotor 4 and a second seal member 71 provided at an end of the first seal member near the rotor 4.

Specifically, the first sealing member includes an upper sealing ring 701 and a lower sealing ring 702 that are adapted, the upper sealing ring 701 is disposed on the inner surface of the inner housing 2, and the lower sealing ring 702 is disposed on the spindle 5 in a surrounding manner;

the lower end of the upper seal ring 701 is provided with a tooth structure, and the outer surface of the lower seal ring 702 is provided with a tooth structure staggered with the upper seal ring 701.

Specifically, referring to fig. 3, the second sealing member 71 includes a metal frame 713 and a sealing layer 714, the metal frame 713 is a ring-shaped frame, the sealing layer 714 is wrapped on the outer side of the metal frame 713, a spring lip 715 inclined towards the spindle 5 is disposed at one end of the metal frame 713 near the first sealing member, a clamping spring 716 is disposed on the outer surface of the spring lip 715 near the metal frame 713, a sealing ring 717 is disposed between the spindle 5 and the spring lip 715, and the spring lip 715 is connected with the sealing ring 717.

Specifically, an oil suction port 9 is formed in the outer casing 1, the oil suction port 9 is communicated with the flow channel 6, a pump casing 10 is connected to the front end of the outer casing 1, a pump shaft 11 is arranged in the pump casing 10, the main shaft 5 is connected with the pump shaft 11, and an oil drain hole 12 is formed in the pump casing 10.

Under the condition of high rotation speed, the oil in the first sealing element forms stable oil film and local pressure extremum under the action of centrifugal force, so that most of oil is prevented from leaking inwards, and only a small part of oil reaches the lip of the second sealing element 71 through the gap to play a role in lubrication; at low rotational speeds or in a shutdown condition, the second seal 71 may block a substantial amount of oil from entering the interior of the housing, avoiding damage to the internal components caused by the substantial amount of oil entering the interior of the motor. Since the leakage amount to the side of the second seal 71 is small and the pressure is low after the oil is sealed by the first seal, the compression amount of the skeleton seal of the second seal 71 can be properly reduced, and the lip aging due to rapid temperature rise at a wide rotation speed is avoided, thereby prolonging the sealing life.

In the present utility model, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.

The above is a preferred embodiment of the present utility model, and is not intended to limit the scope of the present utility model in this way, therefore: all equivalent changes in structure, shape and principle of the utility model should be covered in the scope of protection of the utility model.

Claims (7)

1. An electric motor for an electro-hydraulic excavator, comprising:

an outer case (1);

the inner shell (2) is arranged in the outer shell (1) and forms a flow passage (6) with the outer shell (1);

a stator (3) disposed within the outer housing (1);

a rotor (4) disposed within the stator (3); and

the main shaft (5) is used for supporting the rotor (4), the interior of the main shaft (5) is of a hollow structure, and the flow channel (6) is communicated with the hollow structure in the interior of the main shaft (5);

the combined sealing part (7) is arranged at the joint of the main shaft (5) and the inner shell (2), and the left end and the right end of the main shaft (5) are respectively connected with the inner shell (2) through bearings (8);

the combined sealing part (7) comprises a first sealing element and a second sealing element (71), the bearing (8) is positioned at the outer side of the rotor (4), the first sealing element and the second sealing element (71) are sequentially arranged at one end, close to the rotor (4), of the bearing (8), the first sealing element is communicated with the second sealing element (71), the first sealing element comprises an upper sealing ring (701) and a lower sealing ring (702) which are matched, the upper sealing ring (701) is arranged on the inner surface of the inner shell (2), and the lower sealing ring (702) is arranged on the main shaft (5) in a surrounding mode; the second sealing piece (71) comprises a metal framework (713) and a sealing layer (714), the sealing layer (714) is wrapped on the outer side of the metal framework (713), a spring lip (715) inclined towards the main shaft (5) is arranged at one end, close to the first sealing piece, of the metal framework (713), and a clamping spring (716) is arranged on the outer surface, close to the metal framework (713), of the spring lip (715).

2. The motor for an electro-hydraulic excavator according to claim 1, wherein: the lower end of the upper sealing ring (701) is provided with a tooth-shaped structure, and the outer surface of the lower sealing ring (702) is provided with a tooth-shaped structure staggered with the upper sealing ring (701).

3. The motor for an electro-hydraulic excavator according to claim 1, wherein: a sealing ring (717) is arranged between the main shaft (5) and the spring lip (715), and the spring lip (715) is connected with the sealing ring (717).

4. The motor for an electro-hydraulic excavator according to claim 1, wherein: an oil suction port (9) is formed in the outer shell (1), and the oil suction port (9) is communicated with the runner (6).

5. The motor for an electro-hydraulic excavator according to claim 1, wherein: the novel water pump is characterized in that the front end of the outer shell (1) is connected with a pump shell (10), a pump shaft (11) is arranged in the pump shell (10), the main shaft (5) is connected with the pump shaft (11), and an oil drain hole (12) is formed in the pump shell (10).

6. The motor for an electro-hydraulic excavator according to claim 1, wherein: the joint of the left side and the right side of the main shaft (5) and the inner shell (2) is respectively provided with a combined sealing part (7).

7. The motor for an electro-hydraulic excavator according to claim 1, wherein: the metal framework (713) is a circular framework.