Gear box oil pump having oil unloading structure, and gear box

[0024] Embodiment one

[0025] figure 1 A schematic front view of a casing of a transmission oil pump with an oil unloading structure provided in Embodiment 1 of the present invention. figure 2 for figure 1 A-A cross-sectional schematic diagram in. image 3 It is a schematic structural diagram of a transmission oil pump with an oil unloading structure provided in Embodiment 1 of the present invention. like Figure 1 to Figure 3 As shown, the gearbox oil pump with oil unloading structure provided in this embodiment includes: the casing 1 and the partition 2 of the oil pump fixedly connected, and the oil pump rotor arranged in the cavity surrounded by the casing 1 and the partition 2 (not shown in the figure), the housing 1 is provided with an annular groove 3 and an oil discharge passage 4, the annular groove 3 is located on the outside of the oil pump rotor, and the annular groove 3 is arranged on the joint between the housing 1 and the partition plate 2 On the surface; the unloading oil channel 4 communicates with the annular groove 3.

[0026] Specifically, the oil pump rotor includes a driving gear and a driven gear, the outer teeth of the driving gear mesh with the inner teeth of the driven gear, and a crescent-shaped partition is arranged between the driving gear and the driven gear, and the crescent-shaped partition separates the driving gear The working chamber between the driven gear and the driven gear is divided into an oil suction chamber and an oil pressure chamber. The oil suction chamber communicates with the oil inlet passage. When the driving gear is disengaged, the volume of the oil suction chamber gradually increases, creating a vacuum, and the oil is sucked in; the rotor continues to rotate, and the oil is brought to the side of the oil outlet passage. At this time, the active gear The gear and the driven gear just come into mesh, so that the volume of the oil pressure chamber decreases, the oil pressure increases, and the machine oil is squeezed out from the oil pressure chamber and sent out through the oil outlet channel. That is, the oil suction chamber is a low pressure area, while the oil pressure chamber is a high pressure area. At the same time, the area of ​​the crescent-shaped partition in the rotor of the oil pump is a transition area, which is used to separate the oil suction chamber and the oil pressure chamber, and the pressure in the transition area is between the oil suction chamber and the oil pressure chamber.

[0027] The annular groove 3 provided on the casing 1 is located on the bonding surface between the casing 1 and the partition plate 2, and an oil discharge passage 4 is also provided on the casing 1, and the oil discharge passage 4 communicates with the annular groove 3, so that the casing The liquid oil in the gap between the body 1 and the separator 2 first flows into the oil unloading passage 4, and then flows into the annular groove 3 through the oil unloading oil passage 4. Therefore, in order to make the liquid oil flow smoothly to the oil discharge passage 4, preferably, the oil discharge passage 4 can be arranged in the low pressure area of ​​the transmission oil pump, so that the liquid oil can smoothly enter the low pressure area from the high pressure area. Certainly, the oil discharge oil channel 4 can also be arranged in the transition area of ​​the gearbox oil pump, so that the liquid oil enters the transition area from the high pressure area.

[0028] Further, the inner edge of the annular groove 3 should be positioned at the outer side of the oil pump rotor. Meanwhile, in order to facilitate the layout of the oil discharge oil passage 4, the oil discharge oil passage 4 can be set on the outer edge of the annular groove 3, so that the oil discharge oil passage 4 and the The outer edge of the annular groove 3 communicates.

[0029] Further, a communication hole 5 is provided on the partition plate 2, and the communication hole 5 is located on the partition plate 2 at a position corresponding to the annular groove 3, so that the communication hole 5 can communicate with the annular groove 3, and at the same time, the communication hole 5 also It can communicate with the oil suction channel of the transmission oil pump through the oil groove. Therefore, the liquid oil entering the annular groove 3 can return to the oil suction port of the transmission oil pump through the communication hole 5, so as to effectively reduce the accumulation of liquid oil in the gap between the casing 1 and the separator 2 of the transmission oil pump.

[0030] Preferably, in order to increase the speed and oil volume of liquid oil entering the annular groove, and reduce the accumulation of liquid oil as soon as possible, the number of oil discharge oil passages 4 can be set to multiple, and a plurality of oil discharge oil passages 4 are distributed at intervals in the oil suction The outer side of the cavity or the transition zone, and communicates with the outer edge of the annular groove 3. Specifically, the oil unloading oil passages 4 may be arranged at equal intervals. Further, the width of the plurality of oil discharge passages 4 can be set to be greater than the width of the annular groove 3 . Specifically, the width of the annular groove 3 can be set to 2mm, and the depth of the groove is 0.8mm. The oil discharge passage 4 can be set as an oil discharge through hole with a width greater than 2mm, and then communicated with the annular groove 3 .

[0031] Further, the outer edge and the inner edge of the annular groove 3 can be set to a circle, that is, the annular groove 3 is a grooved ring, and the center of the annular groove 3 coincides with the axis of the driven gear, and the annular groove 3. The diameter of the inner edge is greater than that of the driven gear. In this way, the distance between the annular groove 3 and the driven gear in all directions is equal, so that the oil leaked between the partition plate 2 and the housing 1 can evenly flow into the annular groove 3, and the local annular groove 3 is prevented from being subjected to excessive oil pressure. In addition, the annular groove 3 is concentric with the driven gear, which is also conducive to balancing the distribution of the center of gravity of the oil pump.

[0032] The gearbox oil pump with oil unloading structure provided by the present invention is provided with an annular groove on the surface of the oil pump housing that fits with the baffle, and also has an oil unloading oil passage that communicates with the annular groove. A communication hole is provided at the position corresponding to the annular groove, which communicates with the oil suction channel of the annular groove and the oil pump respectively, so that the oil in the gap between the oil pump casing and the partition plate can be discharged to the oil suction port of the oil pump, so as to slow down the contact between the oil pump casing and the oil suction channel. The rising speed of the oil pressure in the gap of the partition plate effectively reduces the axial force of the oil in the gap of the oil pump on the parts of the oil pump, and also reduces the axial stress of the assembly bolts, which improves the service life of the oil pump.

[0033] In addition, the present invention also provides a gearbox, including the gearbox oil pump with oil unloading structure as described in the first embodiment, wherein the specific structure and functions of the gearbox oil pump with oil unloading structure have been implemented in the aforementioned A detailed description is given in Example 1, which will not be repeated here.

[0034]The gearbox provided by the present invention includes a gearbox oil pump with an oil unloading structure, an annular groove is provided on the surface of the oil pump housing that fits with the partition plate, and an oil unloading passage communicated with the annular groove is also provided. There is a communication hole on the partition plate corresponding to the annular groove, which communicates with the annular groove and the oil suction channel of the oil pump respectively, so that the oil in the gap between the oil pump casing and the partition plate can be discharged to the oil suction port of the oil pump to slow down The rising speed of the oil pressure in the gap between the oil pump shell and the partition plate effectively reduces the axial force of the oil in the gap of the oil pump on the components in the oil pump, and also reduces the axial stress of the assembly bolts, which improves the service life of the oil pump.