Chassis quintuplet pump

Abstract

The utility model provides a chassis quintuplet pump which is applied to a hydraulic transmission system of a bulldozer and comprises a pump body and two rotating shafts arranged in parallel, a front pump cavity is arranged in the front end of the pump body, a rear pump cavity is arranged in the rear end of the pump body, the rotating shafts penetrate through the front pump cavity and the rear pump cavity, and the volume of the front pump cavity is smaller than that of the rear pump cavity. The front pump cavity comprises a first pump cavity body, a second pump cavity body and a third pump cavity body, the first pump cavity body, the second pump cavity body and the third pump cavity body are communicated in series to form a whole, front gear assemblies corresponding to the first pump cavity body, the second pump cavity body and the third pump cavity body are arranged in the front pump cavity, and the rear pump cavity comprises a fourth pump cavity body and a fifth pump cavity body which are arranged in a separated mode. And rear gear assemblies corresponding to the fourth pump cavity and the fifth pump cavity are arranged in the rear pump cavity, the front gear assembly and the rear gear assemblies are fixedly connected to a rotating shaft in a sleeving mode, one end of the rotating shaft is connected with the output end of the driving device, the size is small, and various driving force can be formed.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic pump technology, specifically to a chassis five-unit pump. Background Technology

[0002] The main applications of the hydraulic transmission system in bulldozers include adjusting the blade height, blade angle, and stabilizing the stick. It has advantages such as high reliability, fast response speed, large output power, and stable performance. It can achieve flexible working modes of rapid acceleration or deceleration in a very short time. In the process of working, the hydraulic transmission system often needs to use a hydraulic pump to provide power to the hydraulic transmission system, so that the hydraulic oil outputs power. The structural design of the hydraulic pump is also different according to different usage scenarios.

[0003] Chinese patent application No. 201821020484.6, published on January 4, 2019, discloses an integrated assembly fixture for a five-unit pump. The fixture includes a base plate, at least three casters mounted on the bottom of the base plate, and a predetermined number of support components vertically fixed to the base plate. Each support component includes a support frame vertically fixed to the base plate, a support plate welded to the top of the support frame, and a transition plate located at the top of the support plate. One end of the transition plate is flush with one end of the support plate. The end of the support plate flush with the transition plate has a mounting groove. Two fixing holes are located on the transition plate corresponding to the mounting groove, corresponding to fixing holes on the pump body of the two-unit pump. Connection holes are provided at both ends of the support plate and the transition plate. The two connection holes of the transition plate are located on both sides of the pump body of the two-unit pump fixed to the transition plate. This fixture greatly facilitates the integrated assembly of the five-unit pump, avoiding repeated lifting and adjustment of the heavy pump body, improving assembly cleanliness, and increasing the assembly efficiency of the five-unit pump.

[0004] However, the aforementioned patent documents only describe the specific structure of the tooling for assembling the five-unit pump, without explaining the structural setup of the five-unit pump. In the hydraulic transmission system of a bulldozer, in specific application scenarios, a five-unit pump is required to provide power to the hydraulic transmission system. Existing five-unit pumps generally achieve different driving power requirements by setting up five different chambers and setting up driving devices in each chamber, but this structure makes the entire structure complex. Utility Model Content

[0005] The purpose of this utility model is to provide a chassis five-unit pump that enables hydraulic oil to simultaneously provide multiple different power sources through pump chambers arranged in series, meeting the needs of actual operation, and is practical and reliable.

[0006] This utility model provides the following technical solution: a chassis five-unit pump, applied to the hydraulic transmission system of a bulldozer, including a pump body and two parallel rotating shafts. The pump body has a front pump chamber inside its front end and a rear pump chamber inside its rear end. The rotating shafts pass through the front and rear pump chambers. The front pump chamber includes a first pump chamber, a second pump chamber, and a third pump chamber, which are connected in series to form a single unit. The front pump chamber contains front gear assemblies corresponding to the first, second, and third pump chambers, respectively. The rear pump chamber includes a fourth pump chamber and a fifth pump chamber, which are separated from each other. The cavity is provided with rear gear assemblies corresponding to the fourth pump cavity and the fifth pump cavity respectively. The front gear assembly and the rear gear assembly are both fixedly sleeved on the rotating shaft. One end of the rotating shaft is connected to the output end of the drive device. The front pump cavity is provided with an oil inlet on one side and a first oil outlet and a second oil outlet on the other side. The first oil outlet is connected to the first pump cavity, and the second oil outlet is connected to the second pump cavity and the third pump cavity respectively. The rear pump cavity is provided with a fourth oil inlet and a fifth oil inlet, a fourth oil outlet and a fifth oil outlet. The fourth oil inlet is connected to the fourth pump cavity and the fourth oil outlet, and the fifth oil inlet is connected to the fifth pump cavity and the fifth oil outlet.

[0007] The above configuration, by setting a front gear assembly corresponding to the first, second, and third pump chambers in the front pump chamber, and a rear gear assembly corresponding to the fourth and fifth pump chambers in the rear pump chamber, allows the front and rear gear assemblies on the shaft to rotate simultaneously within the front and rear pump chambers during the rotation of the drive unit. This process enables the hydraulic oil in the first, second, third, fourth, and fifth pump chambers to simultaneously provide multiple different power sources. The front pump chamber supplies hydraulic oil through an inlet and two outlets, while the rear pump chamber supplies hydraulic oil through two inlets and two outlets. This satisfies the power output requirements of the mechanisms connected to the front and rear pump chambers in the bulldozer, thereby meeting the actual operational needs of the bulldozer and ensuring high operational reliability.

[0008] Furthermore, the volume of the front pump chamber is smaller than the volume of the rear pump chamber.

[0009] The above settings allow for a smaller volume of hydraulic oil to be supplied to the front pump chamber, while the rear pump chamber can supply a larger volume of hydraulic oil.

[0010] Furthermore, the first oil outlet and the second oil outlet are located on one side of the rear pump chamber, and the front sidewall of the front pump chamber is provided with a first through cavity and a second through cavity. The first through cavity is connected to the first pump chamber and the first oil outlet, and the second through cavity is connected to the second pump chamber and the second oil outlet.

[0011] The above configuration places the first and second oil outlets on one side of the rear pump chamber, which facilitates the connection of the subsequent oil outlets with external equipment and results in a simple structure.

[0012] Furthermore, a fourth oil outlet and a fifth oil outlet are provided on one side of the rear pump chamber, and a fourth oil inlet and a fifth oil inlet are provided on the other side of the rear pump chamber. The fourth oil outlet and the fourth oil inlet are both connected to the fourth pump chamber, and the fifth oil outlet and the fifth oil inlet are both connected to the fifth pump chamber.

[0013] The above configuration allows hydraulic oil to enter the rear pump chamber through the fourth and fifth inlets, thereby filling the fourth and fifth pump chambers with hydraulic oil. Driven by the rear gear assembly, the fourth outlet connected to the fourth pump chamber and the fifth outlet connected to the fifth pump chamber can simultaneously output different pressures.

[0014] Furthermore, the front gear assembly includes a first gear assembly, a second gear assembly, and a third gear assembly, with the first gear assembly disposed in a first pump chamber, the second gear assembly disposed in a second pump chamber, and the third gear assembly disposed in a third pump chamber; the rear gear assembly includes a fourth gear assembly and a fifth gear assembly, with the fourth gear assembly disposed in a fourth pump chamber and the fifth gear assembly disposed in a fifth pump chamber.

[0015] The above configuration, through the rotation of the shaft, can drive the first gear assembly, second gear assembly, third gear assembly, fourth gear assembly and fifth gear assembly to squeeze hydraulic oil in the first pump chamber, second pump chamber, third pump chamber, fourth pump chamber and fifth pump chamber respectively, so that different pump chambers output different pressures.

[0016] Furthermore, the first gear assembly includes two first gears, which are respectively fixedly sleeved on two rotating shafts and externally meshed. The second gear assembly includes two second gears, which are respectively fixedly sleeved on two rotating shafts and externally meshed. The third gear assembly includes two third gears, which are respectively fixedly sleeved on two rotating shafts and externally meshed. A gap is provided between the first gear, the second gear, and the third gear on the same rotating shaft.

[0017] The above settings ensure that the first gear, the second gear, and the third gear can rotate synchronously in the front pump chamber without interfering with each other.

[0018] Furthermore, the fourth gear assembly includes two fourth gears, which are respectively fixedly sleeved on two rotating shafts and externally meshed. The fifth gear assembly includes two fifth gears, which are respectively fixedly sleeved on two rotating shafts and externally meshed.

[0019] The above configuration allows the fourth gear and the fifth gear to rotate in the fourth pump chamber and the fifth pump chamber respectively, thereby squeezing the hydraulic oil in the fourth pump chamber and the fifth pump chamber and providing power to the outside.

[0020] Furthermore, the rotating shaft includes a front rotating shaft body and a rear rotating shaft body, which are detachably connected. The front rotating shaft body passes through the front pump cavity, and the rear rotating shaft body passes through the rear pump cavity. The first gear assembly, the second gear assembly, and the third gear assembly are all fixedly sleeved on the front rotating shaft body. The fourth gear assembly and the fifth gear assembly are respectively sleeved on the rear rotating shaft body. The rear rotating shaft body has a fourth through cavity at the end away from the front rotating shaft body. One end of the fourth through cavity communicates with the fourth pump cavity through a through port on the rear rotating shaft body, and the other end of the fourth through cavity is connected to the fourth oil outlet.

[0021] The above configuration allows the hydraulic oil in the fourth pump chamber, which is separated from the fifth pump chamber, to pass through the fifth pump chamber via the rear rotating shaft and output power from the fourth oil outlet at the end face of the fifth pump chamber, thus meeting the structural requirements of the bulldozer components.

[0022] Furthermore, the first oil outlet and the second oil outlet are arranged side by side, and the first oil outlet and the second oil outlet are arranged outward along the pump body axis.

[0023] In the above configuration, the first and second oil outlets are arranged side by side. In order to reduce the volume of the pump body, the gap between the first and second oil outlets will be reduced. The first and second oil outlets are tilted outwards to solve the problem of the gap between the first and second oil outlets being too small to install the connector. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0025] Figure 2 This is a schematic diagram of the overall structure of this utility model from another perspective.

[0026] Figure 3 This is the front view of the present invention.

[0027] Figure 4 for Figure 3 View from the center (K ​​direction).

[0028] Figure 5 This is a side view of the present invention.

[0029] Figure 6 for Figure 5 View from P in the middle.

[0030] Figure 7 This is a cross-sectional view of the present invention.

[0031] Figure 8 This is a partial exploded view of the present invention.

[0032] Figure 9 for Figure 8 Enlarged view of point A in the middle.

[0033] Figure 10 for Figure 8 Enlarged view of section B in the middle. Detailed Implementation

[0034] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0035] like Figure 1-10As shown, this utility model provides a chassis five-unit pump for use in the hydraulic transmission system of a bulldozer. It includes a pump body 1 and two parallel rotating shafts. The pump body 1 has a front pump chamber at its front end 01 and a rear pump chamber at its rear end 02. The front end 01 and rear end 02 of the pump body are detachably connected by a locking member 2, allowing them to be integrated into a single unit and facilitating disassembly and assembly during maintenance. The rotating shafts pass through the front and rear pump chambers and include a front rotating shaft body 3 and a rear rotating shaft body 4. The front rotating shaft body 3 and rear rotating shaft body 4 are detachably connected. The front rotating shaft body 3 passes through the front pump chamber, and the rear rotating shaft body 4 passes through the rear pump chamber. The volume of the front pump chamber is smaller than that of the rear pump chamber. The pump body 1 has a front pump chamber comprising a first pump chamber 11, a second pump chamber 12, and a third pump chamber 13, which are connected in series to form a single unit. One side of the front pump chamber has an oil inlet 5, and the other side has a first oil outlet 21 and a second oil outlet 22. The first oil outlet 21 communicates with the first pump chamber 11. In this embodiment, the pump body 1 has a first through cavity 6 and a second through cavity 61. The first pump chamber 11 communicates with the first oil outlet 21 through the first through cavity 6, and the second pump chamber 12 communicates with the second oil outlet 22 through the second through cavity 61. Both the first through cavity 6 and the second through cavity 61 extend through the pump body 1 from the front end to the rear end. The first oil outlet 21 is inclined outwards along the axial direction of the pump body 1. The oil outlet 22 is inclined outward along the axis of the pump body 1. The second oil outlet 22 is connected to the second pump chamber 12 and the third pump chamber 13 respectively. The first oil outlet 21 and the second oil outlet 22 are arranged side by side on one side of the rear pump chamber, and the first oil outlet 21 and the second oil outlet 22 are inclined outward along the axis of the pump body. In this way, due to the limited volume of the pump body 1, the distance between the first and second through chambers is small. When the distance is too small, there is no spacer connector on the first oil outlet 21 and the second oil outlet 22. Therefore, the two oil outlets are inclined outward to increase the distance and facilitate the installation of the connector. The front pump chamber is provided with front gear assemblies corresponding to the first pump chamber 11, the second pump chamber 12 and the third pump chamber 13 respectively. This allows hydraulic oil to enter the front pump chamber through the inlet 5, thereby filling the first pump chamber 11, second pump chamber 12, and third pump chamber 13 with hydraulic oil. Driven by the front gear assembly, the first outlet 21, connected to the first pump chamber 11 via the first passage 6, and the second outlet 22, connected to the second pump chamber 12 and third pump chamber 13 via the second passage 61, simultaneously output different pressures. The front gear assembly is fixedly sleeved on the front rotating shaft 3. The front gear assembly includes a first gear assembly, a second gear assembly, and a third gear assembly. The first gear assembly is located in the first pump chamber 11, the second gear assembly is located in the second pump chamber 12, and the third gear assembly is located in the third pump chamber 13. The rotating shaft then rotates...This allows the first gear assembly, second gear assembly, and third gear assembly to squeeze hydraulic oil in the first pump chamber 11, second pump chamber 12, and third pump chamber 13, respectively, and then output different pressures through the first oil outlet 21 and the second oil outlet 22. In this embodiment, the first gear assembly, second gear assembly, and third gear assembly are all fixedly sleeved on the front rotating shaft body 3. The first gear assembly includes two first gears 31, which are fixedly sleeved on the front rotating shaft body 3 of the two rotating shafts, and the two first gears 31 are externally meshed. The second gear assembly includes two... The second gear 32 is fixedly sleeved on the front rotating shaft body 3 of the two rotating shafts, and the two second gears 32 are externally meshed. The third gear assembly includes two third gears 33, which are also fixedly sleeved on the front rotating shaft body 3 of the two rotating shafts, and the two third gears 33 are externally meshed. A gap is provided between the first gear 31, the second gear 32, and the third gear 33 on the same rotating shaft, so that the first gear 31, the second gear 32, and the third gear 33 can rotate synchronously in the front pump chamber without interfering with each other. In this embodiment, the locking element 2 is a bolt and a nut.

[0036] like Figure 1 , Figure 7 , Figure 8 and Figure 9As shown, the rear pump chamber includes a fourth pump chamber 14 and a fifth pump chamber 15, which are separated. One side of the rear pump chamber has a fourth oil outlet 24 and a fifth oil outlet 25, while the other side has a fourth oil inlet 44 and a fifth oil inlet 45. Both the fourth oil outlet 24 and the fourth oil inlet 44 are connected to the fourth pump chamber 14, and both the fifth oil outlet 25 and the fifth oil inlet 45 are connected to the fifth pump chamber 15. The rear pump chamber is equipped with rear teeth corresponding to those in the fourth pump chamber 14 and the fifth pump chamber 15, respectively. The gear assembly allows hydraulic oil to enter the rear pump chamber through the fourth inlet 44 and the fifth inlet 45, thereby filling the fourth pump chamber 14 and the fifth pump chamber 15 with hydraulic oil. Driven by the rear gear assembly, the fourth outlet 24 connected to the fourth pump chamber 14 and the fifth outlet 25 connected to the fifth pump chamber 15 can simultaneously output different pressures. The rear rotating shaft 4 passes through the rear pump chamber, and the rear gear assembly is fixedly sleeved on the rear rotating shaft 4 of the rotating shaft. The rear gear assembly includes a fourth gear assembly and... The fifth gear assembly, along with the fourth and fifth gear assemblies, is respectively sleeved on the rear rotating shaft 4. The fourth gear assembly is located in the fourth pump chamber 14, and the fifth gear assembly is located in the fifth pump chamber 15. Rotation of the rear rotating shaft causes the fourth and fifth gear assemblies to squeeze hydraulic oil in the fourth and fifth pump chambers 14 and 15, respectively, thus outputting different pressures through the fourth oil outlet 24 and fifth oil outlet 25. The fourth gear assembly includes two fourth gears 34, which are fixedly sleeved on the rear rotating shafts 4 of the two shafts and are externally meshed. The fifth gear assembly includes two fifth gears 35, which are also fixedly sleeved on the rear rotating shafts 4 of the two shafts and are externally meshed. This allows the fourth and fifth gears 34 and 35 to rotate within the fourth and fifth pump chambers 14 and 15, respectively, squeezing the hydraulic oil in these chambers and providing power outwards.

[0037] In this embodiment, the rear rotating shaft 4 includes a first rear rotating shaft 41. One end of the first rear rotating shaft 41 is rotatably connected to the front end of the pump body 1, and the other end of the first rear rotating shaft 41 is rotatably connected to the inner wall of the rear pump cavity. The first rear rotating shaft 41 is hollow, and an opening is provided on the outer side wall of the end of the first rear rotating shaft 41 away from the front rotating shaft 3. The opening and the hollow structure of the first rear rotating shaft 41 form a fourth through cavity (not shown in the figure). One end of the fourth through cavity is connected to the fourth pump cavity 14 through the opening (not shown in the figure), and the other end of the fourth through cavity is connected to the fourth oil outlet 24. The fourth oil outlet 24 is located near the end face of the fifth pump cavity 15. A fourth gear in the fourth gear assembly is provided on the first rear rotating shaft 41. The first rear rotating shaft 41 is arranged parallel to the rear rotating shaft 4. On the one hand, it is used to install a fourth gear, and on the other hand, it allows hydraulic oil to flow from the fourth passage of the rear rotating shaft 41 through the fifth pump chamber to the fourth oil outlet 24. This facilitates the hydraulic oil in the fourth pump chamber 14, which is separated from the fifth pump chamber 15, to output power from the fourth oil outlet 24 at the end face of the fifth pump chamber 15 after passing through the fifth pump chamber 15 from the rear rotating shaft 41. This satisfies the structural configuration of the structural components in the bulldozer. The front rotating shaft 3 includes a first front rotating shaft 30, which is arranged parallel to the front rotating shaft 3. The end of the first front shaft 30 near the rear rotating shaft is rotatably arranged with the inner wall of the rear pump chamber, and the other end of the first front shaft 30 is rotatably arranged with the inner wall of the front pump chamber. A first gear assembly, a second gear assembly, and a third gear assembly are fixedly sleeved on the first front shaft 30.

[0038] One end of the rotating shaft is fixedly connected to the output end of the drive device. In this embodiment, the drive device includes a drive motor (not shown in the figure). The drive motor is mounted on the mounting base 7 at the front end of the pump body 1. The end of the front rotating shaft 3 away from the connection with the rear rotating shaft 4 is fixedly connected to the output end of the drive motor. The end of the fifth pump chamber 15 is rotatably connected to other structural components in the bulldozer hydraulic transmission system. This allows the end of the rear rotating shaft 4 away from the connection with the front rotating shaft 3 to pass through the fifth pump chamber 15 and rotatably connect to other structural components in the bulldozer hydraulic transmission system. In this way, the rotating shaft can be driven to rotate by the drive motor.

[0039] In this embodiment, the first pump chamber 11, the second pump chamber 12 and the third pump chamber 13 are connected in series to form a whole and are separated from the fourth pump chamber 14. The rear rotating shaft 4 is provided with sealing rings (not shown in the figure) at the connection between the partition plate (not shown in the figure) between the fourth pump chamber 14 and the fifth pump chamber 15, and at the connection between the rotating shaft and the third pump chamber 13 and the fourth pump chamber 14, to prevent hydraulic oil leakage between different pump chambers.

[0040] The working principle of this utility model is as follows: The drive device drives the rotating shaft to rotate, which in turn drives the front gear assembly corresponding to the first pump chamber 11, the second pump chamber 12, and the third pump chamber 13, as well as the rear gear assembly corresponding to the fourth pump chamber 14 and the fifth pump chamber 15, to rotate simultaneously in the front and rear pump chambers, respectively. Since the volumes of the front and rear pump chambers are set differently, the hydraulic oil in the first pump chamber 11, the second pump chamber 12, the third pump chamber 13, the fourth pump chamber 14, and the fifth pump chamber 15 can simultaneously provide multiple different power sources to the outside, thereby meeting the power output of the mechanism connected to the front and rear pump chambers in the bulldozer, and thus realizing the actual operation requirements of the bulldozer.

Claims

1. A chassis-mounted five-unit pump, applied to the hydraulic transmission system of a bulldozer, characterized in that: The pump includes a pump body and two parallel rotating shafts. The pump body has a front pump chamber at its front end and a rear pump chamber at its rear end. The rotating shafts pass through the front and rear pump chambers. The front pump chamber includes a first pump chamber, a second pump chamber, and a third pump chamber, which are connected in series to form a single unit. The front pump chamber contains front gear assemblies corresponding to the first, second, and third pump chambers. The rear pump chamber includes a fourth pump chamber and a fifth pump chamber, which are separated from each other. The rear pump chamber contains gears corresponding to the fourth and fifth pump chambers. The corresponding rear gear assembly, front gear assembly, and rear gear assembly are all fixedly sleeved on the rotating shaft. One end of the rotating shaft is connected to the output end of the drive device. An oil inlet is provided on one side of the front pump chamber, and a first oil outlet and a second oil outlet are provided on the other side of the front pump chamber. The first oil outlet is connected to the first pump chamber, and the second oil outlet is connected to the second pump chamber and the third pump chamber respectively. A fourth oil inlet and a fifth oil inlet, a fourth oil outlet and a fifth oil outlet are provided on the rear pump chamber. The fourth oil inlet is connected to the fourth pump chamber and the fourth oil outlet, and the fifth oil inlet is connected to the fifth pump chamber and the fifth oil outlet.

2. The chassis five-unit pump according to claim 1, characterized in that: The volume of the front pump chamber is smaller than the volume of the rear pump chamber.

3. A chassis-mounted five-unit pump according to claim 1, characterized in that: The first oil outlet and the second oil outlet are located on one side of the rear pump chamber. The front sidewall of the front pump chamber is provided with a first through cavity and a second through cavity. The first through cavity is connected to the first pump chamber and the first oil outlet, and the second through cavity is connected to the second pump chamber and the second oil outlet.

4. A chassis-mounted five-unit pump according to claim 1, characterized in that: The rear pump chamber is provided with a fourth oil outlet and a fifth oil outlet on one side, and a fourth oil inlet and a fifth oil inlet on the other side. The fourth oil outlet and the fourth oil inlet are both connected to the fourth pump chamber, and the fifth oil outlet and the fifth oil inlet are both connected to the fifth pump chamber.

5. A chassis-mounted five-unit pump according to claim 1, characterized in that: The front gear assembly includes a first gear assembly, a second gear assembly, and a third gear assembly. The first gear assembly is disposed in a first pump chamber, the second gear assembly is disposed in a second pump chamber, and the third gear assembly is disposed in a third pump chamber. The rear gear assembly includes a fourth gear assembly and a fifth gear assembly. The fourth gear assembly is disposed in a fourth pump chamber, and the fifth gear assembly is disposed in a fifth pump chamber.

6. A chassis-mounted five-unit pump according to claim 5, characterized in that: The first gear assembly includes two first gears, which are respectively fixedly sleeved on two rotating shafts and externally meshed. The second gear assembly includes two second gears, which are respectively fixedly sleeved on two rotating shafts and externally meshed. The third gear assembly includes two third gears, which are respectively fixedly sleeved on two rotating shafts and externally meshed. A gap is provided between the first gear, the second gear, and the third gear on the same rotating shaft.

7. A chassis-mounted five-unit pump according to claim 5, characterized in that: The fourth gear assembly includes two fourth gears, which are respectively fixedly sleeved on two rotating shafts and externally meshed. The fifth gear assembly includes two fifth gears, which are respectively fixedly sleeved on two rotating shafts and externally meshed.

8. A chassis-mounted five-unit pump according to claim 1, characterized in that: The rotating shaft includes a front rotating shaft body and a rear rotating shaft body, which are detachably connected. The front rotating shaft body passes through the front pump cavity, and the rear rotating shaft body passes through the rear pump cavity. The first gear assembly, the second gear assembly, and the third gear assembly are all fixedly sleeved on the front rotating shaft body. The fourth gear assembly and the fifth gear assembly are respectively sleeved on the rear rotating shaft body. The rear rotating shaft body has a fourth through cavity at the end away from the front rotating shaft body. One end of the fourth through cavity communicates with the fourth pump cavity through a through port on the rear rotating shaft body, and the other end of the fourth through cavity is connected to the fourth oil outlet.

9. A chassis-mounted five-unit pump according to claim 1, characterized in that: The first oil outlet and the second oil outlet are arranged side by side, and the first oil outlet and the second oil outlet are arranged outward along the pump body axis.

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