An intermediate gearbox for hybrid locomotive

Abstract

The present invention relates to an intermediate gearbox for hybrid vehicles, comprising: a housing, the housing accommodating a gear speed change system and a lubrication system; the housing comprising an upper housing, a middle housing, and a lower housing; a gear speed change system, the gear speed change system comprising an input shaft assembly and an output shaft assembly; a lubrication system, the lubrication system providing lubrication for the gearbox; wherein the lubrication system comprises a bidirectional gear oil pump, an oil pump input gear, an oil filter, an oil pump seat, an oil distributor, an oil pipe, a pipe joint, an oil passage, a magnetic steel, and an oil pan; the input shaft assembly and the output shaft assembly are provided with a bearing sleeve 1, a bearing sleeve 2, and a bearing sleeve 3, the oil passage is arranged on the housing, and the bidirectional gear oil pump is connected with the input shaft assembly and the oil inlets of the bearing sleeve 1, the bearing sleeve 2, and the bearing sleeve 3 through the oil distributor, the oil pipe, the pipe joint, and the oil passage. The present invention has the advantages of high transmission efficiency, low noise, excellent lubrication, long service life, good interchangeability, and easy installation and maintenance.

Description

Technical Field

[0001] The present invention relates to the technical field of reducers, and in particular to the technical field of an intermediate gearbox for a hybrid vehicle. Background Art

[0002] The gearbox is an important component in the power transmission mechanism of the new hybrid locomotive. Its function is to transmit the speed and torque of the traction motor to the locomotive axle gearbox, and achieve the effect of speed reduction and torque increase through internal gear transmission to meet the input speed and torque requirements of the locomotive axle gearbox.

[0003] In the prior art, the power source of the working condition locomotive is mainly a diesel engine. Due to the external characteristics of the diesel engine, it is difficult to obtain the ideal traction characteristics of the running locomotive by directly using the power output of the diesel engine. This requires the use of an intermediate power transmission device to convert the diesel engine power, so as to obtain the ideal traction characteristics that meet the locomotive operation. The intermediate power transmission device is the hydraulic transmission box of the internal combustion locomotive. Although the use of the hydraulic transmission box makes the power output of the diesel engine and the locomotive traction have a better match, the traditional internal combustion locomotive still faces two major problems that cannot be ignored: energy shortage and environmental pollution. At the same time, the internal combustion locomotive also has problems such as complex structure and low efficiency. Therefore, a new hybrid locomotive that uses a battery pack to provide energy, drives the whole vehicle to run through motor power transmission, and uses a diesel engine to generate electricity to supplement the power when the battery pack is insufficient has come into being. Under the current global trend of advocating energy conservation and environmental protection, whether in terms of energy conservation and emission reduction or reducing the complexity of the locomotive, the new hybrid locomotive has a greater competitive advantage than the traditional internal combustion locomotive.

[0004] Since the new hybrid locomotive uses an electric motor as the direct power source of the locomotive, and the control of the external characteristic curve of the electric motor is easier than that of a diesel engine, the intermediate power transmission device used in the prior art, namely the hydraulic transmission box, is too complicated. However, in order to meet the requirements of the locomotive two-position gearbox for input torque and speed, an intermediate gearbox, which is actually a first-stage reduction box, is still required. At the same time, since the new hybrid locomotive is modified on the basis of the overall design of the original traditional internal combustion locomotive, many mechanisms in the original design still need to be used. Therefore, the intermediate gearbox should be compatible in terms of connection interface, installation method, and volume, and should also meet the design requirements of traditional locomotive parts such as low noise, long life, good interchangeability, and easy installation and maintenance.

[0005] In order to meet the above design requirements, the present invention proposes a new solution. Summary of the invention

[0006] The purpose of the present invention is to solve the problems in the prior art and to provide an intermediate gearbox for hybrid vehicles, which has the advantages of high transmission efficiency, low noise, excellent lubrication, long service life, good interchangeability, and easy installation and maintenance.

[0007] In order to overcome the problems existing in the prior art, the present invention provides the following technical solutions:

[0008] An intermediate gearbox for a hybrid vehicle, comprising:

[0009] A box body, wherein the box body accommodates a gear speed change system and a lubrication system; the box body comprises an upper box body, a middle box body, and a lower box body;

[0010] A gear transmission system, the gear transmission system comprising an input shaft assembly and an output shaft assembly;

[0011] a lubrication system, wherein the lubrication system provides lubrication for the gearbox;

[0012] The lubrication system includes a bidirectional gear oil pump, an oil pump input gear, an oil filter, an oil pump seat, an oil separator, an oil pipe, a pipe joint, an oil channel, a magnetic steel and an oil pan; the input shaft assembly and the output shaft assembly are provided with a bearing sleeve 1, a bearing sleeve 2 and a bearing sleeve 3, the oil channel is arranged on the housing, and the bidirectional gear oil pump is connected with the input shaft assembly and the oil inlets of the bearing sleeve 1, the bearing sleeve 2 and the bearing sleeve 3 through the oil separator, the oil pipe, the pipe joint and the oil channel.

[0013] In the intermediate gearbox for hybrid vehicles disclosed in the present application, optionally, the input shaft assembly and the output shaft assembly are parallel to each other and installed horizontally, the input shaft assembly is located between the upper case body and the middle case body dividing surface, the output shaft assembly is located between the middle case body and the lower case body dividing surface, and the input shaft assembly is located above the output shaft assembly.

[0014] In the intermediate gearbox for hybrid locomotive disclosed in the present application, optionally, the input shaft assembly includes an input helical gear, the output shaft assembly includes an output helical gear, the input helical gear and the output helical gear are meshed and connected in the box body, the two shaft ends of the input shaft assembly are arranged outside the box body, the two shaft ends of the input shaft assembly are provided with conical surfaces, the conical surfaces are connected to the elastic coupling through interference fit, and then connected to the traction motor; the two shaft ends of the output shaft assembly are arranged outside the box body, the two ends of the output shaft assembly are provided with output flanges, and the output flanges are connected to the input flange of the locomotive two-axle gearbox through a universal coupling.

[0015] In the intermediate gearbox for hybrid vehicles disclosed in the present application, optionally, a transverse oil passage is provided directly above the input bevel gear, and the transverse oil passage is provided on the upper case body.

[0016] In the intermediate gearbox for hybrid vehicles disclosed in the present application, optionally, two traction motor mounting seats are provided on the middle case body, and two front mounting seat mounting surfaces and two rear mounting seat mounting surfaces are provided on both side surfaces of the middle case body.

[0017] In the intermediate gearbox for hybrid vehicles disclosed in the present application, optionally, the input shaft assembly also includes an input shaft, a cylindrical roller bearing 1, and a four-point contact ball bearing; the input shaft assembly is connected to the housing through a bearing sleeve 1 and a bearing sleeve 2.

[0018] In the intermediate gearbox for hybrid vehicles disclosed in the present application, optionally, the output shaft assembly includes an output shaft, a cylindrical roller bearing 1, an oil pump drive gear, a cylindrical roller bearing 2, and a four-point contact ball bearing; the output shaft assembly is connected to the box body through a bearing sleeve 1 and a bearing sleeve 3.

[0019] In the intermediate gearbox for hybrid vehicles disclosed in the present application, optionally, the upper case and the middle case, and the middle case and the lower case are assembled and connected into a whole by bolts, and the bottom of the lower case can store lubricating oil.

[0020] In the intermediate gearbox for hybrid vehicles disclosed in the present application, optionally, the oil filter in the lubrication system is installed on the oil pump seat; the oil pump input gear is installed on the bidirectional gear oil pump; the oil pump seat and the bidirectional gear oil pump are installed on the oil pan; the oil pan is installed on the lower case body and placed at the bottom of the lower case body, and an oil drain plug is provided at the bottom of the oil pan.

[0021] In the intermediate gearbox for hybrid vehicles disclosed in the present application, optionally, an upper observation cover and a breathable cap are provided on the top of the upper box body, a lower observation cover 1 and a lower observation cover 2 are provided on the left and right sides of the lower box body respectively, an oil mark and an oil inlet cap are provided on the front of the lower box body, and an oil separator is provided on the bottom of the lower box body, and the oil separator is placed below the output bevel gear.

[0022] The beneficial effects of the present invention are:

[0023] 1. The input end of the present invention adopts a dual-input motor structure, which makes the whole machine have high power and torque; it has a built-in motor mounting seat, which is convenient, simple, safe and reliable when assembling the motor; it is equipped with front and rear mounting seat mounting surfaces, which can be directly assembled to the frame using the front and rear mounting seats of the original diesel locomotive, avoiding the need to redesign the mounting seat. It has high transmission efficiency, good interchangeability and is easy to install.

[0024] 2. The lubrication system of the present invention is designed with oil spray lubrication for all parts that need lubrication, and at the same time provides fast circulation fluidity for the lubricating oil. The output bevel gear stirs and splashes the lubricating oil onto the inner wall of the box body, thereby improving the heat dissipation performance of the gear box. The oil separator can prevent the output bevel gear from stirring the lubricating oil too violently when the gear box is running at high speed, so that the gear box can adapt to high-speed operation. The oil pan is installed at the bottom of the lower box body and can be removed from the bottom of the lower box body to the outside, which is convenient for maintenance of the lubrication system and improves maintenance efficiency. The design of the entire lubrication system can effectively reduce the oil temperature, with low noise and excellent lubrication, thereby reducing the temperature rise of the gear box, allowing it to work normally and continuously, and can reduce the number of maintenance and extend its service life.

[0025] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a schematic diagram of the main view of an intermediate gearbox for a hybrid locomotive;

[0028] Figure 2 It is a top view schematic diagram of an intermediate gearbox for a hybrid locomotive;

[0029] Figure 3 It is a left side schematic diagram of an intermediate gearbox for a hybrid locomotive;

[0030] Figure 4 is a cross-sectional view of an intermediate gearbox for a hybrid vehicle;

[0031] Figure 5 It is a schematic diagram of the overall three-dimensional structure of an intermediate gearbox for a hybrid locomotive;

[0032] Figure 6 is a schematic diagram of the structure of the input shaft assembly of the intermediate gear box;

[0033] Figure 7 is a schematic diagram of the structure of the output shaft assembly of the intermediate gear box;

[0034] Figure 8 It is a structural diagram of the lubrication system;

[0035] Fig. 9 It is a structural schematic diagram of the oil separator.

[0036] In the picture

[0037] 100-box; 101-upper box; 102-middle box; 103-lower box; 104-breathable cap; 105-upper observation cover; 106-oil separator; 107-lower observation cover 1; 108-lower observation cover 2; 109-oil inlet cap; 110-oil mark; 111-motor mounting seat; 112-front mounting seat mounting surface; 113-rear mounting seat mounting surface; 114-oil drain plug; 200-gear transmission system; 210-input shaft assembly; 211-input shaft; 212-cylindrical roller bearing 1; 213-four-point contact ball bearing; 214-shaft Bearing sleeve one; 215-bearing sleeve two; 216-input bevel gear; 217-conical surface; 220-output shaft assembly; 221-output flange; 222-output shaft; 223-oil pump drive gear; 224-bearing sleeve three; 225-cylindrical roller bearing two; 226-output bevel gear; 230-lubrication system; 231-bidirectional gear oil pump; 232-oil pump input gear; 233-oil filter; 234-oil pump seat; 235-oil distributor; 236-oil pipe; 237-pipe joint; 238-oil channel; 239-oil pan; 240-magnetic steel. DETAILED DESCRIPTION

[0038] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0039] In the description of the embodiments of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0041] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention application embodiment can repeat reference numbers or reference letters in different examples, and this repetition is only for the purpose of simplification and clarity, and itself does not indicate the relationship between the various embodiments discussed or / and settings.

[0042] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0043] The present invention provides an intermediate gearbox for a hybrid vehicle, comprising: a housing 100 , a gear speed change system 200 and a lubrication system 230 .

[0044] like Figure 1-Figure 5 , the housing 100 accommodates the gear transmission system 200 and the lubrication system 230; the housing 100 includes an upper housing 101, a middle housing 102, and a lower housing 103; the upper housing 101 and the middle housing 102, the middle housing 102 and the lower housing 103 are assembled and connected into a whole by bolts, and the bottom of the lower housing 103 can store lubricating oil. Two traction motor mounting seats 111 are arranged on the middle housing 102. The two motor mounting seats 111 of the present invention are symmetrically distributed along the central axis of the gear box. The two traction motors can be directly mounted on the gear box, avoiding the problem that the coaxiality of the motor output shaft and the gear box input shaft is difficult to ensure due to different positioning references when the motor is installed on the frame. And the motor can be directly assembled on the gear box before the gear box is installed on the vehicle, which greatly reduces the difficulty of assembly. Two front mounting seat mounting surfaces 112 and two rear mounting seat mounting surfaces 113 are arranged on both sides of the middle housing 102. The two front mounting seat holes and the two rear mounting seat holes of the present invention are symmetrically distributed along the central axis of the gear box and are used for installing the front and rear mounting seats. The front and rear mounting seats are transition connection components between the present invention and the locomotive frame and are components used in the original diesel locomotive design.

[0045] like Figure 1-Figure 7 , the gear transmission system 200 includes an input shaft assembly 210 and an output shaft assembly 220; the gear transmission system 200 is used to reduce the speed and torque of the driving device (traction motor) through internal gear transmission to increase the torque and transmit it to the actuator (locomotive two-position axle gearbox).

[0046] The input shaft assembly 210 and the output shaft assembly 220 are parallel to each other and installed horizontally. The input shaft assembly 210 is located between the dividing surfaces of the upper box body 101 and the middle box body 102, and the output shaft assembly 220 is located between the dividing surfaces of the middle box body 102 and the lower box body 103, and the input shaft assembly 210 is located above the output shaft assembly 220.

[0047] The input shaft assembly 210 includes an input bevel gear 216, and the output shaft assembly 220 includes an output bevel gear 226. The input bevel gear 216 and the output bevel gear 226 are meshed and connected in the housing 100. The two shaft ends of the input shaft assembly 210 are arranged outside the housing 100. The two shaft ends of the input shaft assembly 210 are provided with conical surfaces 217. The conical surfaces 217 are connected to the elastic coupling through interference fit, and then connected to the traction motor; the two shaft ends of the output shaft assembly 220 are arranged outside the housing 100. The two ends of the output shaft assembly 220 are provided with output flanges 221. The output flange 221 is connected to the input flange of the locomotive two-position axle gearbox through a universal coupling.

[0048] A transverse oil passage is provided just above the input bevel gear 216, and the transverse oil passage is provided on the upper housing 101. The output bevel gear 226 is partially placed below the oil level of the lower housing 103, and can carry lubricating oil on the tooth surface through rotation during operation to complete the meshing lubrication with the input bevel gear 216. When the input speed of the gearbox is low, the outer circle linear speed of the output bevel gear 226 will be lower than the minimum linear speed requirement for splash lubrication, and the tooth surface lubrication will not be sufficient. Therefore, a transverse oil passage 238 is also provided on the upper housing 101, which communicates with the left oil passage and is located just above the input bevel gear 216. A number of small holes are arranged on the oil passage 238, which can spray the lubricating oil directly onto the tooth surface of the input bevel gear 216 to achieve the function of supplementary lubrication.

[0049] The input shaft assembly 210 includes an input shaft 211, a cylindrical roller bearing 212, and a four-point contact ball bearing 213; the cylindrical roller bearing 212 and the four-point contact ball bearing 213 are arranged in a bearing sleeve 215, and the cylindrical roller bearing 212 is arranged in the bearing sleeve 1 214; the input shaft assembly 210 is connected to the housing 100 through the bearing sleeve 1 214 and the bearing sleeve 215.

[0050] The output shaft assembly 220 includes an output shaft 212, a cylindrical roller bearing 1 212, an oil pump driving gear 223, a cylindrical roller bearing 225, and a four-point contact ball bearing 213; the cylindrical roller bearing 225 is arranged in a bearing sleeve 3 224, and the cylindrical roller bearing 1 212 and the four-point contact ball bearing 213 are arranged in the bearing sleeve 1 214 respectively; the output shaft assembly 220 is connected to the housing 100 through the bearing sleeve 1 214 and the bearing sleeve 3 224. The left and right ends of the output shaft assembly 220 are connected to the housing 100 through two bearing sleeves 1 214, and the middle part is connected to the housing 100 through two bearing sleeves 3 224. The diameter of the output helical gear 226 is larger than that of the input helical gear 216, so it can reduce the rotation speed and increase the torque during the gear meshing process. Since all parts of the oil pump input gear 232 are higher than the oil level of the lower housing 103, splash lubrication cannot be performed. Therefore, a small hole is also arranged on the oil passage of the middle housing 102 of the left oil passage, and the hole is directly above the oil pump drive gear 223, so that the lubricating oil can be directly sprayed onto the tooth surface, thereby achieving the lubrication effect on the oil pump drive gear 223 and the oil pump input gear 232. At this point, all parts of the gearbox are fully lubricated. At the same time, the lubricating oil also takes away the heat generated by the friction of these parts, and finally flows back to the bottom of the housing 100 under the action of gravity. The two-way gear oil pump 231 and gravity enable the lubricating oil to obtain the power to circulate rapidly inside the gearbox, and the output bevel gear 226 stirs and splashes the lubricating oil onto the inner wall of the housing 100, thereby improving the heat dissipation performance of the gearbox. The entire lubrication system can effectively reduce the oil temperature, thereby reducing the temperature rise of the gearbox, enabling it to work normally and continuously, and can reduce the number of maintenance and extend the service life. The input shaft assembly 210 is used to receive the torque and speed of the traction motor, and transmit it to the output shaft assembly 220 through gears, and the output shaft assembly 220 finally transmits it to the locomotive second axle gearbox.

[0051] like Figure 1-Figure 8 , a lubrication system 230, wherein the lubrication system 230 provides lubrication for the gear box; and is used for lubrication and cooling of various rotating parts of the gear box.

[0052] The lubrication system 230 includes a bidirectional gear oil pump 231, an oil pump input gear 232, an oil filter 233, an oil pump seat 234, an oil separator 235, an oil pipe 236, a pipe joint 237, an oil channel 238, a magnet 240 and an oil pan 239; the input shaft assembly 210 and the output shaft assembly 220 are provided with a bearing sleeve 1 214, a bearing sleeve 215, and a bearing sleeve 3 224, and the oil channel 238 is arranged on the housing 100. The bidirectional gear oil pump 231 is connected to the input shaft assembly 210 and the oil inlets of the bearing sleeve 1 214, the bearing sleeve 215, and the bearing sleeve 3 224 through the oil separator 235, the oil pipe 236, the pipe joint 237, and the oil channel 238.

[0053] The bidirectional gear oil pump 231 pumps the lubricating oil at the bottom of the housing 100 to the oil separator 235, where the lubricating oil is divided into two left and right oil paths, and then passes through the oil pipe 236, the pipe joint 237, and the oil passage 238 on the housing 100 in turn to reach the bearing sleeves of the input shaft assembly 210 and the output shaft assembly 220, and then is sprayed out from the oil outlet through the oil holes on the bearing sleeves, thereby achieving the lubrication effect on the bearings in each bearing sleeve.

[0054] The oil filter 233 in the lubrication system 230 is mounted on the oil pump seat 234; the oil pump input gear 232 is mounted on the bidirectional gear oil pump 231; the oil pump seat 234 and the bidirectional gear oil pump 231 are mounted on the oil pan 239; the oil pan 239 is mounted on the lower box 103 and placed at the bottom of the lower box 103, and an oil drain plug 114 is provided at the bottom of the oil pan 239. The oil filter 233 can filter and purify the lubricating oil, and the magnetic steel 240 can absorb iron filings in the lubricating oil, thereby reducing pollutants in the lubricating oil and increasing the life of the bearings, gears, etc. in the gear box. The oil filter 233, the two-way gear oil pump 231, the oil pump seat 234, and the magnet 240 are all directly or indirectly mounted on the oil pan 239, and the oil pan 239 is mounted on the bottom of the lower box 103, and can be removed from the bottom of the lower box 103. Therefore, when the lubrication system is maintained (such as removing iron filings on the magnet 240, filtered materials on the oil filter 233, etc.), there is no need to completely disassemble the gearbox, and only the oil pan 239 needs to be removed from the bottom of the lower box 103, which greatly improves the maintenance efficiency. In addition, when the lubricating oil needs to be replaced, the oil drain plug 114 at the bottom of the oil pan 239 is located at the lowest point of the box volume, which can fully drain the lubricating oil inside the gearbox.

[0055] In this embodiment, the input helical gear 216 and the output helical gear 226 are standard involute helical gears, the oil pump drive gear 223 and the oil pump input gear 232 are standard involute helical spur gears, and the cylindrical roller bearing 1 212, the cylindrical roller bearing 225 and the four-point contact ball bearing 213 are all standard bearings with high interchangeability and low maintenance cost.

[0056] like Figure 1-Figure 9The upper box body 101 is provided with an upper observation cover 105 and a breathable cap 104 on the top, and the lower box body 103 is provided with a lower observation cover 107 and a lower observation cover 2 108 on the left and right sides respectively. The lower box body 103 is provided with an oil mark 110 and an oil inlet cover 109 on the front, and the lower box body 103 is provided with an oil separator 106 at the bottom, and the oil separator 106 is placed under the output bevel gear. The upper observation cover 105 of the present invention is connected to the upper box body 101 by bolts. After disassembly, the input bevel gear 216 can be observed or tested, and the oil injection condition of the lubrication system of this part can also be checked. The breathable cap 104 is a respirator of the gear box. The temperature inside the gear box will change when it is stopped and working, thereby causing a pressure difference between the inside and the outside. The breathable cap 104, as a respirator, can adjust the internal air pressure of the gear box to make it consistent with the outside. At the same time, in order to prevent possible pollutants from the outside from entering the gear box, a filter that can filter air is provided in the breathable cap 104. The lower observation cover 107 and the lower observation cover 2 108 are connected to the lower housing 103 by bolts. After disassembly, the output bevel gear 226, the lubrication system 230, the housing 100, the oil separator 106, etc. can be observed or inspected. The oil inlet cover 109 is used to refuel the gearbox after removal. The oil mark 110 is used to ensure that the lubricating oil is sufficient and appropriate when refueling. The oil separator 106 isolates the part of the output bevel gear 226 below the oil level of the lower housing 103 to form a separate volume space. The oil separator 106 is provided with a number of small holes, which can allow the lubricating oil in the housing 100 to slowly flow into the oil separator 106. Since the lubricating oil in the oil separator 106 is relatively independent and limited in flow, the oil separator 106 can prevent the output bevel gear 226 from stirring the lubricating oil too violently when the gearbox is running at high speed, thereby increasing the oil temperature and causing the gearbox to overheat.

[0057] Gearbox lubrication and heat dissipation principle: The bidirectional gear oil pump 231 pumps the lubricating oil at the bottom of the box 100 to the oil distributor 235. The lubricating oil is divided in the oil distributor 235 to form two oil paths on the left and right sides, and then passes through the oil pipe 236, the pipe joint 237, and the oil passage 238 on the box 100 to reach the bearing sleeves of the input shaft assembly 210 and the output shaft assembly 220 in turn, and then sprays out from the oil outlet after passing through the oil holes on the bearing sleeves, thereby achieving the lubrication of the bearings in each bearing sleeve. The output helical gear 226 is partially placed below the oil level of the lower box 103. During operation, it can carry the lubricating oil on the tooth surface through rotation to complete the meshing lubrication with the input helical gear 216. When the speed of the input shaft 211 of the gearbox is low, the outer circle linear speed of the output helical gear 226 will be lower than the minimum linear speed required for splash lubrication, and the tooth surface lubrication will not be sufficient. Therefore, a transverse oil passage 238 is also provided on the upper housing 101, which communicates with the left oil passage and is located directly above the input helical gear 216. A number of small holes are arranged on the oil passage 238, which can directly spray the lubricating oil onto the tooth surface of the input helical gear 216 to achieve the function of supplementary lubrication. In addition, since all parts of the oil pump input gear 232 are higher than the oil level surface of the lower housing 103, splash lubrication cannot be performed. Therefore, a small hole is also provided on the oil passage 238 of the middle housing 102 of the left oil passage, and the hole is directly above the oil pump drive gear 223, which can directly spray the lubricating oil onto the tooth surface to achieve the lubrication of the oil pump drive gear 223 and the oil pump input gear 232. At this point, all parts of the gearbox are fully lubricated. At the same time, the lubricating oil also takes away the heat generated by the friction of these parts, and finally flows back to the bottom of the box body 100 under the action of gravity. The two-way gear oil pump 231 and gravity enable the lubricating oil to circulate rapidly inside the gearbox, and the output bevel gear 226 stirs and splashes the lubricating oil to the inner wall of the box body 100, thereby improving the heat dissipation performance of the gearbox. The entire lubrication system 230 can effectively reduce the oil temperature, thereby reducing the temperature rise of the gearbox, allowing it to work normally and continuously, and can reduce the number of maintenance and extend the service life.

[0058] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An intermediate gearbox for a hybrid vehicle, characterized in that: include: A box body (100), wherein the box body (100) accommodates a gear speed change system (200) and a lubrication system (230); the box body (100) comprises an upper box body (101), a middle box body (102), and a lower box body (103); The gear transmission system (200) comprises an input shaft assembly (210) and an output shaft assembly (220); The lubrication system (230) provides lubrication for the gear box; The lubrication system (230) comprises a bidirectional gear oil pump (231), an oil pump input gear (232), an oil filter (233), an oil separator (235), an oil pipe (236), a pipe joint (237), and an oil passage (238); the input shaft assembly (210) is provided with a first bearing sleeve (214) and a second bearing sleeve (215); the output shaft assembly (220) is provided with a first bearing sleeve (214), a second bearing sleeve (215), and a third bearing sleeve ( 224), the oil passage (238) is arranged on the housing (100), and the bidirectional gear oil pump (231) is connected to the oil inlets of the bearing sleeve 1 (214) and the bearing sleeve 2 (215) on the input shaft assembly (210) and the oil inlets of the bearing sleeve 1 (214), the bearing sleeve 2 (215) and the bearing sleeve 3 (224) on the output shaft assembly (220) through the oil distributor (235), the oil pipe (236), the pipe joint (237), and the oil passage (238); The input shaft assembly (210) comprises an input bevel gear (216), and the output shaft assembly (220) comprises an output bevel gear (226). The input bevel gear (216) and the output bevel gear (226) are meshedly connected in the housing (100). The two shaft ends of the input shaft assembly (210) are arranged outside the housing (100). The two shaft ends of the input shaft assembly (210) are provided with conical surfaces (217). The oil passage (238) is arranged on the upper housing (101). The oil passage (238) is arranged above the input bevel gear (216) and in a transverse direction. The two shaft ends of the output shaft assembly (220) are arranged outside the housing (100). Output flanges (221) are provided at both ends of the output shaft assembly (220). Two traction motor mounting seats (111) are provided on the middle box body (102), and two front mounting seat mounting surfaces (112) and two rear mounting seat mounting surfaces (113) are provided on two side surfaces of the middle box body (102); The lubrication system (230) comprises an oil pump seat (234), a magnetic steel (240) and an oil pan (239); the oil filter (233) in the lubrication system (230) is mounted on the oil pump seat (234); the oil pump input gear (232) is mounted on the bidirectional gear oil pump (231); the oil pump seat (234) and the bidirectional gear oil pump (231) are mounted on the oil pan (239); the oil pan (239) is mounted on the lower case (103) and placed at the bottom of the lower case (103); an oil drain plug (114) is provided at the bottom of the oil pan (239); An oil separator (106) is provided at the bottom of the lower box body (103); the oil separator (106) is arranged below the output bevel gear (226) and surrounds the lower half of the output bevel gear (226).

2. The intermediate gearbox for hybrid vehicles according to claim 1, characterized in that: The input shaft assembly (210) and the output shaft assembly (220) are parallel to each other and are installed horizontally; the input shaft assembly (210) is located between the dividing surfaces of the upper box body (101) and the middle box body (102); the output shaft assembly (220) is located between the dividing surfaces of the middle box body (102) and the lower box body (103); and the input shaft assembly (210) is located above the output shaft assembly (220).

3. The intermediate gearbox for hybrid vehicles according to claim 1, characterized in that: The input shaft assembly (210) is connected to the housing (100) via a first bearing sleeve (214) and a second bearing sleeve (215).

4. The intermediate gearbox for a hybrid vehicle as claimed in claim 1, characterized in that: The output shaft assembly (220) is connected to the housing (100) at the left and right ends through two bearing sleeves 1 (214) and at the middle through two bearing sleeves 3 (224).

5. The intermediate gearbox for hybrid vehicles according to claim 1, characterized in that: The upper box body (101) and the middle box body (102), as well as the middle box body (102) and the lower box body (103) are assembled and connected into a whole by bolts, and the bottom of the lower box body (103) stores lubricating oil.

6. The intermediate gearbox for hybrid vehicles according to claim 1, characterized in that: The oil separator (106) isolates the portion of the output bevel gear (226) below the oil level of the lower housing (103) to form a separate space. The oil separator (106) is provided with a plurality of small holes, and lubricating oil at the bottom of the housing (100) flows into the oil separator (106) through the small holes.

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