CN110778687B

CN110778687B - Simple and safe motor speed increasing device

Info

Publication number: CN110778687B
Application number: CN201911065819.5A
Authority: CN
Inventors: 王丽红
Original assignee: Individual
Current assignee: Qingdao Jinding Xinbao Special Vehicle Co ltd
Priority date: 2019-11-04
Filing date: 2019-11-04
Publication date: 2022-07-01
Anticipated expiration: 2039-11-04
Also published as: CN110778687A

Abstract

A motor speed increasing device comprises a box body, an input shaft and an output shaft are respectively connected with two ends of the box body, the inner part of the input shaft is provided with a primary transmission mechanism, a secondary transmission mechanism and a tertiary transmission mechanism, the input shaft is connected with a transmission plate of the primary transmission mechanism, the tail end of the transmission plate is connected with a first transmission shaft of the secondary transmission mechanism, the outer side of the first transmission shaft is movably connected with the steering mechanism through a connecting shaft, the first transmission shaft is arranged to be capable of transmitting power under the combined action of the primary transmission mechanism and the steering mechanism, the back end of the first transmission shaft is connected with a second transmission shaft, the other end of the second transmission shaft is connected with a three-stage transmission mechanism, the third-stage transmission mechanism comprises a planetary gear, a central gear and a connecting plate, the second transmission shaft can drive the planetary gear to rotate around the central gear, and the central gear is connected with an output shaft. Above-mentioned motor speed increasing device has simplified overall structure, has reduced manufacturing cost, and is safe in utilization simultaneously.

Description

Simple and safe motor speed increasing device

Technical Field

The invention relates to the field of speed changing devices, in particular to a motor speed increasing device which can simply, conveniently and safely change the power transmission state between an input shaft and an output shaft. .

Background

When a mechanical product or a working machine needs to change output torque or output rotating speed, a power transmission system, such as a speed increaser or a speed reducer, is usually connected. A common speed increaser has a gear type structure in which a planetary gear mechanism is often used, a sun gear is provided at the center of the planetary gear mechanism, a ring gear ring as an internal gear is provided around the sun gear, a plurality of planetary gears are arranged between the sun gear and the ring gear ring, the plurality of planetary gears are attached to a carrier that carries the plurality of planetary gears and are supported by shafts, the planetary gears revolve around the inside of the ring gear ring while rotating, and the sun gear and the carrier are arranged concentrically and are connected to an input shaft and an output shaft, respectively. On the basis, a multi-stage structure can be formed.

However, the gear structure required by the speed increasing device comprises a sun gear, a plurality of planet gears and an annular gear ring, the number of the planet gears is large, the cost is high, particularly, the annular gear ring is an inner gear ring, the processing difficulty is high, the precision of the inner gear is lower than that of the outer gear under the same processing condition, and the processing cost is higher than that of the outer gear. Moreover, the number of gears is large, and the multistage gear generates considerable noise in the high-speed operation process, at least above 70 decibels, and has great influence on the surrounding environment. Moreover, the external annular gear ring has a large volume, so that the whole structure of the speed increaser is very heavy.

Disclosure of Invention

The invention mainly solves the problems of complex gear structure, high processing difficulty and high cost in the existing speed increasing device, simplifies the whole structure by providing the simple and safe motor speed increasing device, improves the output rotating speed of an output shaft by a mode of driving a planetary gear to drive a central gear to rotate by a primary transmission mechanism and a secondary transmission mechanism, and has stable structure and safe use.

The technical scheme of the invention is as follows:

the utility model provides a motor speed increasing device, includes the box, the box is preferably square structure, is convenient for place and remove, be equipped with oiling mouth and oil discharge outlet on the box, the box both ends are connected with input shaft and output shaft respectively, and inside one-level drive mechanism, second grade drive mechanism and the tertiary drive mechanism of being equipped with of box, one-level, second grade and tertiary drive mechanism link to each other, finally realize being greater than the rotational speed of input shaft from the output shaft rotational speed that tertiary drive mechanism connects.

The primary transmission mechanism is located at the front end and comprises a transmission plate, the starting end of the transmission plate is connected with the input shaft, and the tail end of the transmission plate is connected with the secondary transmission mechanism to provide starting support for multi-angle rotation of the secondary transmission mechanism.

The secondary transmission mechanism comprises a first transmission shaft and a second transmission shaft, the first transmission shaft and the second transmission shaft are rotatably connected, and a certain included angle exists between the first transmission shaft and the second transmission shaft. The first transmission shaft is connected with the transmission plate, the outer side of the first transmission shaft is movably connected with the steering mechanism through the connecting shaft, the steering mechanism is connected to the box body through the rotating shaft and can only rotate around the rotating shaft, the axis of the rotating shaft is not overlapped with the axis of the connecting shaft, and the first transmission shaft can periodically change directions within a certain range under the combined action of the transmission plate of the first-stage transmission mechanism and the steering mechanism. The second transmission shaft and the first transmission shaft are rotatably connected at one end far away from the transmission plate, the other end of the second transmission shaft is connected with the third-stage transmission mechanism, preferably, the connecting piece between the first transmission shaft and the second transmission shaft comprises a ball cage universal joint, and constant-speed universal transmission can be realized.

The three-stage transmission mechanism comprises a planetary gear, a central gear and a connecting plate, the planetary gear is fixedly connected with the second transmission shaft, the planetary gear is meshed with the central gear, the central gear is connected with the output shaft, the connecting plate is arranged on the outer side of the end face of the planetary gear and the outer side of the end face of the central gear, two ends of the connecting plate are movably connected with the second transmission shaft and the output shaft respectively, and a corresponding bearing is arranged at the connecting position, so that the connecting plate can rotate flexibly.

In the motor speed increasing device, the end of the transmission plate, that is, the end connected with the secondary transmission mechanism, is provided with the inclined part, an included angle α exists between the inclined part and the starting end of the transmission plate, and the included angle α is in an angle range of 120 degrees to 160 degrees. The existence of the included angle alpha between the inclined part and the starting end of the transmission plate can conveniently support the first transmission shaft to be arranged in an inclined mode, and a connecting hole at the connecting position of the inclined part and the first transmission shaft is conveniently machined.

Furthermore, the inclined part still is equipped with the extension cover towards first transmission shaft one end, extension cover internal diameter suits with first transmission shaft size. The design of extra extension cover can make the driving plate more stable to the centre gripping of first transmission shaft, at the high-speed pivoted in-process of first transmission shaft, maintains motor speed increasing gear's operation stable.

According to the motor speed increasing device, the sleeve is further arranged on the outer side of the first transmission shaft, the steering mechanism is movably connected with the sleeve through the connecting shaft, and the first transmission shaft inside is protected through the sleeve.

Furthermore, a connecting seat is arranged in the middle of the outer wall of the sleeve and used for being connected with the connecting shaft.

As the motor speed increasing device, the steering mechanism comprises the transmission frame, the transmission frame is hollow, and the inner space of the transmission frame is more than twice of the diameter of the sleeve. Preferably, the transmission frame comprises a square frame, the square frame is convenient to manufacture, and a connecting shaft mounting hole and a rotating shaft mounting hole are formed in the outer side wall of the transmission frame. Preferably, the center line of the connecting shaft mounting hole on the outer side wall of the transmission frame is perpendicular to the center line of the rotating shaft mounting hole. When the transmission frame rotates in the vertical plane of the axis of the rotating shaft, the sleeve can be well clamped by the connecting shaft.

Furthermore, a connecting sleeve and a fixing plate are arranged between the steering mechanism and the box body, the fixing plate is fixed on the box body, the connecting sleeve is located between the steering mechanism and the fixing plate, and a rotating shaft penetrates through the connecting sleeve.

In the motor speed increasing device, the number of the planetary gear teeth is not more than that of the central gear teeth, and preferably, the number of the planetary gear teeth is the same as that of the central gear teeth, the shape is the same, the gears with the same specification are used for convenient processing, and meanwhile, stable transmission ratio output is kept. Because the transmission ratio is not too high, the rotating speed of each mechanism in the motor speed increasing device can be controlled within a reasonable range, and the service life of the device is prolonged.

According to the motor speed increasing device, the oil filling port is located at the upper part of the box body, and the oil discharging port is located at the lower end of the side wall of the box body. The height of the oil in the box body is not lower than the height of the tooth root when the planetary gear rotates to the lowest point, and effective lubrication of all transmission mechanisms in the box body is guaranteed.

Furthermore, except the joint of the input shaft and the transmission plate, the joint of the planetary gear and the sun gear and the second transmission shaft and the joint of the output shaft, and the shaft joints in the box body are provided with bearings so as to ensure that the shafts rotate flexibly.

The invention has the beneficial effects that:

1. the motor speed increasing device disclosed by the invention is simple in overall structure, stable in structure and safe to use, and the output rotating speed of the output shaft is improved in a mode that the primary transmission mechanism and the secondary transmission mechanism drive the planetary gear in the tertiary transmission mechanism and then drive the central gear to rotate.

2. According to the motor speed increasing device disclosed by the invention, the first transmission shaft keeps the same rotating speed as the input shaft in the box body to perform stable constant-speed circumferential rotation through the continuous rotation of the transmission plate and the up-and-down swing of the transmission frame, and the second transmission shaft and the planetary gear are pushed to perform circumferential rotation around the central gear, so that the transmission mechanisms at all levels are coordinated and stable and are orderly, the motor speed increasing device can be ensured to work for a long time, and the safety coefficient is improved.

3. According to the motor speed increasing device disclosed by the invention, the height of the box body can be determined according to the highest point and the lowest point which can be reached when the planetary gear rotates around the central gear, and compared with the traditional speed increasing device, an external surrounding gear ring is omitted, the size and the weight of the device are greatly reduced, and the device is convenient to use and carry.

4. The motor speed increasing device disclosed by the invention is arranged outside the planetary gear and the central gear, and the manufacturing difficulty of other parts is lower, so that the manufacturing cost is effectively saved, and the mass production and manufacturing of enterprises are facilitated.

Drawings

The aspects and advantages of the present application will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention.

In the drawings:

fig. 1 is a side sectional view of a motor speed increasing device of the embodiment 1;

FIG. 2 is a top sectional view of the motor speed increasing device;

FIG. 3 is an isometric view of various component parts of the interior of the case;

FIG. 4 is a side view of the drive plate;

FIG. 5 is a top view of FIG. 4;

FIG. 6 is a schematic mechanical view of the connection plate;

the components represented by the reference numerals in the figures are:

1. the oil filling device comprises a box body, 101, an oil filling opening, 102, an oil discharging opening, 2, an input shaft, 3, a transmission plate, 301, an inclined portion, 302, a lengthened sleeve, 303, a first connecting hole, 304, a second connecting hole, 4, a first transmission shaft, 5, a sleeve, 501, a connecting seat, 6, a transmission frame, 7, a connecting shaft, 8, a connecting sleeve, 9, a fixing plate, 10, a ball cage universal joint, 11, a second transmission shaft, 12, a planetary gear, 13, a central gear, 14, a connecting plate, 1401, a third connecting hole, 1402, a fourth connecting hole, 15 and an output shaft.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. It should be noted that these embodiments are provided so that this disclosure can be more completely understood and fully conveyed to those skilled in the art, and the present disclosure may be implemented in various forms without being limited to the embodiments set forth herein.

The directions "front and back", "left and right", etc. mentioned in the present invention are only used to express the relative positional relationship, and are not restricted by any specific directional references in practical application.

Example 1

Referring to fig. 1-3, fig. 1-3 show a motor speed increasing device according to this embodiment, which includes a box 1, where the box 1 is of a square structure and is convenient to place and move, and two ends of the box 1 are respectively connected to an input shaft 2 and an output shaft 15. A first-stage transmission mechanism, a second-stage transmission mechanism and a third-stage transmission mechanism are arranged inside the box body 1 and connected with one another, and finally the rotating speed of an output shaft 15 connected with the third-stage transmission mechanism is larger than that of the input shaft 2.

Further, the primary transmission mechanism is located at the front end of the box body 1 and comprises a transmission plate 3, the transmission plate 3 is structurally shown in fig. 4 and 5, the front portion of the transmission plate is a straight section, the rear portion of the transmission plate is an inclined portion 301, an included angle alpha is formed between the inclined portion 301 and the straight section, and the included angle alpha is larger than or equal to 120 degrees and smaller than or equal to 160 degrees. If the included angle is too large, the secondary transmission mechanism can be elongated, and if the included angle is too small, the arrangement of the secondary transmission mechanism is influenced. Preferably, the included angle α in this embodiment is 150 °, so as to minimize the length of the secondary transmission mechanism on the basis of ensuring the arrangement space of the secondary transmission mechanism.

Referring to fig. 5, a first connection hole 303 is formed at the starting end of the straight section of the transmission plate 3, and a second connection hole 304 is formed in the inclined section 301, wherein the first connection hole 303 is matched with the input shaft 2 in size, and the second connection hole 304 is matched with the corresponding transmission shaft of the secondary transmission mechanism in size.

Furthermore, a first connecting hole 303 on the transmission plate 3 is fixedly connected with the input shaft 2, the two are relatively non-rotatable, and a second connecting hole 304 at the tail end of the transmission plate 3 is movably connected with the secondary transmission mechanism to provide initial support for multi-angle rotation of the secondary transmission mechanism. When the input shaft 2 rotates, the transmission plate 3 rotates at a constant speed along with the input shaft 2 and drives the secondary transmission mechanism at the tail end to rotate. Moreover, the inclined portion 301 and the starting end of the transmission plate 3 form an included angle alpha, so that the inclined arrangement of the transmission shaft in the secondary transmission mechanism can be conveniently supported, and in addition, the second connecting hole 304 is perpendicular to the inclined portion 301, so that the processing is convenient. Of course, the transmission plate 3 may also be a straight plate structure, and only the second connection hole 304 needs to be changed into an inclined hole to be matched with the transmission shaft in the secondary transmission mechanism in an angle manner.

Preferably, the inclined part 301 of the transmission plate 3 is further provided with an elongated sleeve 302 towards one end of the secondary transmission mechanism, and the inner diameter of the elongated sleeve 302 is adapted to the size of a transmission shaft in the secondary transmission mechanism. The design of the extra lengthening sleeve 302 can enable the connection between the primary transmission mechanism and the secondary transmission mechanism to be more stable, and the operation stability of the motor speed increasing device is maintained in the process of high-speed rotation of the input shaft 1.

In this embodiment, the secondary transmission mechanism includes a first transmission shaft 4 and a second transmission shaft 11, and the first transmission shaft 4 and the second transmission shaft 11 are connected through a ball cage universal joint 10, and a certain included angle exists between the two. The end of the first transmission shaft 4 far away from the second transmission shaft 11 is connected with the second connecting hole 304 of the transmission plate 3 in a shaft sleeve mode. The outer side of the first transmission shaft 4 is also provided with a sleeve 5, and the length of the sleeve 5 is smaller than that of the first transmission shaft 4, so that the sleeve 5 can be used for protecting the first transmission shaft 4 inside.

Referring to fig. 2, two sides of the sleeve 5 are movably connected with the transmission frame 6 through a connecting shaft 7, and the sleeve 5 can rotate in the transmission frame 6 through the connecting shaft 7. Preferably, a connecting seat 501 is arranged in the middle of the outer wall of the sleeve 5 and used for being connected with the connecting shaft 7 so as to protect the first transmission shaft 4 inside the sleeve 5 from being influenced by external force and reducing transmission efficiency.

Further, the transmission frame 6 is hollow, and the inner space of the transmission frame 6 is larger than twice of the diameter of the sleeve 5, so that the sleeve 5 has enough rotating space when being driven by the transmission plate 3 to rotate, and cannot interfere with the transmission frame 6. Preferably, the driving frame 6 is a square frame, which is convenient to manufacture as shown in fig. 3, and has a third connecting hole 1401 and a fourth connecting hole 1402 respectively formed on the outer sidewalls of the four surfaces thereof. The third connecting hole 1401 is located in the direction of the central line of the input shaft 1 and is used for connecting with the connecting shaft 7, and the fourth connecting hole 1402 is located on the adjacent surface of the surface where the third connecting hole 1401 is located and is used for connecting the transmission frame 6 and the box body 1. Preferably, the center lines of the third connecting hole 1401 and the fourth connecting hole 1402 are perpendicular to each other, and when the transmission frame 6 rotates in a vertical plane of the center line of the fourth connecting hole 1402, the connecting shaft 7 can well hold the sleeve 5. Preferably, the sleeve 5 is located at the center of the front and rear third connecting holes 1401.

Further, be equipped with adapter sleeve 8 and fixed plate 9 between driving frame 6 and the box 1, fixed plate 9 is fixed on box 1, adapter sleeve 8 is located between driving frame 6 and the fixed plate 9, has worn the axis of rotation in the adapter sleeve 8.

Preferably, the connecting shaft 7 and the transmission plate 3 are located in the same plane, the connecting sleeve 8 and the input shaft 2 are located on the same horizontal plane, that is, the first transmission shaft 4 rotates around the intersection point of the central line of the connecting sleeve 8 and the central line of the input shaft 2, and because the intersection point is located on the central line of the input shaft 2, the rotation of the transmission plate 3 and the rotation of the first transmission shaft 4 can keep relatively constant, so that the constant-speed stable transmission from the first-stage transmission mechanism to the second-stage transmission mechanism is realized, and when the transmission plate 3 rotates for one circle, the tail end of the first transmission shaft 4 also rotates for one circle.

Of course, the joints of the connecting shaft 7, the rotating shaft and the like of the secondary transmission mechanism are provided with shaft sleeves so as to ensure that the mechanism rotates flexibly.

Further, 11 one end of second transmission shaft and first transmission shaft 4 pass through ball cage universal joint 10 and rotate and be connected, and the other end links to each other with tertiary drive mechanism, tertiary drive mechanism is gear drive, and ball cage universal joint 10's use can guarantee that second transmission shaft 11 combines well with the gear, makes things convenient for drive gear to carry out the circumferential rotation.

In this embodiment, the three-stage transmission mechanism includes a planetary gear 12, a sun gear 13 and a connecting plate 14, the planetary gear 12 is fixedly connected with the second transmission shaft 11, the sun gear 13 is fixedly connected with the output shaft 15, the planetary gear 12 and the sun gear 13 are meshed with each other, the connecting plate 14 is arranged on the right side of the end surfaces of the planetary gear 12 and the sun gear 13, the connecting plate 14 is structurally shown in fig. 6, a third connecting hole 1401 and a fourth connecting hole 1402 are respectively arranged at two ends of the connecting plate 14, the third connecting hole 1401 is movably connected with the second transmission shaft 11, the fourth connecting hole 1402 is movably connected with the output shaft 15, and corresponding bearings are respectively arranged at the connecting positions, so that the connecting plate 14 can rotate flexibly. In this way, when the second transmission shaft 11 drives the planetary gear 12 to rotate, the connecting plate 14 can ensure that the planetary gear 12 and the sun gear 13 are always in a meshed state, and further drive the sun gear and the output shaft 15 to rotate.

Preferably, the central line of the output shaft 14, the central line of the input shaft 2 and the central line of the rotating shaft are all located on the same horizontal plane, so that the distance from the central line of the rotating shaft to the central line of the second transmission shaft 11 is the same as the distance from the output shaft 14 to the central line of the second transmission shaft 11, and the meshing between the planetary gear 12 and the sun gear 13 is ensured to be firm.

The three-stage transmission mechanism is similar to a planetary gear train and has a structure that an outer ring sun gear is omitted, but the number of planet gears in the traditional planetary gear train is three, and the stable operation can be realized only by the outer ring sun gear and a corresponding gear carrier.

Further, planetary gear 12 tooth number is not more than the central gear 13 tooth number, and is preferred, planetary gear 12 tooth number is the same with the central gear 13 tooth number, and the shape is the same, uses the gear of the same specification to simplify the technology, has reduced the processing cost, keeps stable drive ratio output simultaneously. Because the number of teeth of the planetary gear 12 is the same as that of the central gear 13, the transmission ratio is 2, and the transmission ratio is not too high, the rotating speed of each mechanism in the motor speed increasing device can be controlled within a reasonable range, and the service life of the device can be prolonged.

In this embodiment, the tank body 1 is provided with an oil filling port 101 and an oil discharge port 102, the oil filling port 101 is located at the top of the tank body 1, and the oil discharge port 102 is located at the lower end of the side wall of the tank body 1, see fig. 2, which facilitates oil discharge.

Furthermore, the height of oil in the box body 1 is not lower than the height of a tooth root when the planetary gear 12 rotates to the lowest point, so that each transmission mechanism in the box body 1 can be effectively lubricated.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or additions or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A simple, convenient and safe motor speed increasing device is characterized by comprising a box body (1), wherein an oil filling port (101) and an oil discharging port (102) are formed in the box body (1), an input shaft (2) and an output shaft (15) are respectively connected to two ends of the box body (1), and a primary transmission mechanism, a secondary transmission mechanism and a tertiary transmission mechanism are arranged inside the box body (1);

the primary transmission mechanism comprises a transmission plate (3), the starting end of the transmission plate (3) is connected with the input shaft (2), and the tail end of the transmission plate is connected with the secondary transmission mechanism;

the two-stage transmission mechanism comprises a first transmission shaft (4) and a second transmission shaft (11), one end of the first transmission shaft (4) is connected with the transmission plate (3), the outer side of the first transmission shaft is movably connected with the steering mechanism through a connecting shaft (7), the steering mechanism is connected onto the box body (1) through a rotating shaft, the axis of the rotating shaft is not overlapped with the axis of the connecting shaft (7), the first transmission shaft (4) is arranged to periodically change directions within a certain range under the combined action of the first-stage transmission mechanism and the steering mechanism, one end, far away from the transmission plate (3), of the first transmission shaft (4) is rotatably connected with the second transmission shaft (11), and the second transmission shaft (11) is connected with the third-stage transmission mechanism;

the three-stage transmission mechanism comprises a planetary gear (12), a central gear (13) and a connecting plate (14), the planetary gear (12) is connected with a second transmission shaft (11), the planetary gear (12) is meshed with the central gear (13), the central gear (13) is connected with an output shaft (15), the connecting plate (14) is arranged on the outer sides of the end faces of the planetary gear (12) and the central gear (13), and two ends of the connecting plate are respectively movably connected with the second transmission shaft (11) and the output shaft (15).

2. The simple and safe motor speed increasing device according to claim 1, characterized in that the end of the transmission plate (3) connected with the secondary transmission mechanism is provided with an inclined part (301), the inclined part (301) and the starting end of the transmission plate (3) form an included angle α, and the included angle α is in an angle range of 120 ° to 160 °.

3. The simple, convenient and safe motor speed increasing device according to claim 1 or 2, wherein a sleeve (5) is further arranged outside the first transmission shaft (4), and the steering mechanism is movably connected with the sleeve (5) through a connecting shaft (7).

4. The simple, safe motor speed increasing device according to claim 3, wherein the steering mechanism comprises a transmission frame (6), the transmission frame (6) is hollow, the inner space of the transmission frame is more than twice of the diameter of the sleeve (5), and the outer side wall of the transmission frame is provided with a connecting shaft (7) mounting hole and a rotating shaft mounting hole.

5. The simple and safe motor speed increasing device as claimed in claim 4, wherein the transmission frame (6) comprises a square frame, and the center line of the mounting hole of the connecting shaft (7) on the outer side wall of the square frame is perpendicular to the center line of the mounting hole of the rotating shaft.

6. The simple, convenient and safe motor speed increasing device according to claim 1, wherein a connecting sleeve (8) and a fixing plate (9) are arranged between the steering mechanism and the box body (1), the fixing plate is fixed on the box body (1), the connecting sleeve (8) is arranged between the steering mechanism and the fixing plate (9), and a rotating shaft penetrates through the connecting sleeve (8).

7. The simple and safe motor speed increasing device as claimed in claim 1, wherein the connecting member between the first transmission shaft (4) and the second transmission shaft (11) comprises a ball cage universal joint.

8. The simple and safe motor speed increasing device according to claim 1, wherein the number of teeth of the planetary gear (12) is not more than that of the sun gear (13).

9. The simple and safe motor speed increasing device according to claim 1, wherein the number of teeth of the planetary gear (12) is the same as that of the sun gear (13).

10. The simple and safe motor speed increasing device according to any one of claims 4 to 9, wherein the oil filling port (101) is located at the upper part of the box body (1), and the oil discharging port (102) is located at the lower end of the side wall of the box body (1).