Duplex gear pump unit

Abstract

The utility model discloses a duplex gear pump unit, and aims to provide a duplex gear pump unit which is simple in structure, convenient to install and capable of ensuring the lubricating performance of a wheel shaft and a bearing. The pump body comprises a main body, a transition body, a middle body and a pump cover which are sequentially connected through bolts, a first cavity is formed between the main body and the transition body, a second cavity is formed between the middle body and the pump cover, and a communicating hole for communicating the first cavity with the second cavity is formed in the transition body; the first gear pump comprises a first driving wheel and a first driven wheel which are arranged in a first cavity, and the first cavity comprises a first oil suction cavity and a first oil pressing cavity; the second gear pump comprises a second driving wheel and a second driven wheel which are arranged in the second cavity, and a wheel shaft of the first driving wheel and a wheel shaft of the second driving wheel are connected at the communicating hole.

Description

Technical Field

[0001] The utility model relates to the field of gear pumps, in particular to a double gear pump unit. Background Art

[0002] A duplex pump consists of two single-stage pumps housed in a single pump housing and connected in parallel within the oil circuit. The rotors of the two pumps are driven by the same drive shaft and have independent oil inlets and outlets. The two pumps can have equal or unequal flow rates. Because duplex pumps consist of two single-stage pumps housed in a single pump housing, their structure is relatively complex. Current duplex pumps often suffer from complex structures and inflexible installation.

[0003] On the other hand, there are many axles in the duplex pump, and the axles are important power transmission components in the duplex pump. The lubrication performance of the bearings between the axles and the pump body has a great impact on the transmission smoothness and service life of the pump; however, the current duplex pump structure has the problem of inconvenient operation of adding lubricating oil, and it is difficult to effectively lubricate the bearings on each axle, thereby affecting the transmission smoothness and service life of the duplex pump. Utility Model Content

[0004] The first purpose of the utility model is to provide a double gear pump unit with a simple structure and easy installation.

[0005] The second purpose of the utility model is to provide a double gear pump unit that can automatically lubricate the axle and the bearing during the operation of the double gear pump unit to ensure the lubrication performance of the axle and the bearing.

[0006] The technical solution of the utility model is:

[0007] A double gear pump unit, comprising:

[0008] The pump body comprises a main body, a transition body, an intermediate body and a pump cover connected in sequence by bolts, a first cavity is formed between the main body and the transition body, a second cavity is formed between the intermediate body and the pump cover, and a connecting hole connecting the first cavity and the second cavity is provided in the transition body;

[0009] The first gear pump includes a first driving wheel and a first driven wheel arranged in a first cavity, and the first cavity includes a first oil suction cavity and a first oil pressure cavity;

[0010] The second gear pump includes a second driving wheel and a second driven wheel arranged in the second cavity, and the wheel shaft of the first driving wheel is connected to the wheel shaft of the second driving wheel at the connecting hole. In the double gear pump unit of this solution, since the pump body includes a main body, a transition body, an intermediate body and a pump cover connected in sequence by bolts, a first cavity is formed between the main body and the transition body, a second cavity is formed between the intermediate body and the pump cover, and a connecting hole connecting the first cavity and the second cavity is provided in the transition body; based on this, when the double gear pump unit is actually installed,

[0011] First, install the first gear pump, install the first driving wheel and the first driven wheel in the first cavity between the main body and the transition body, and then connect the main body and the transition body with bolts;

[0012] Next, for the second gear pump, bolt the intermediate body to the transition body, install the second driving wheel and the second driven wheel in the second cavity between the intermediate body and the pump cover, and then bolt the intermediate body to the pump cover to complete the installation. Alternatively, install the second driving wheel and the second driven wheel in the second cavity between the intermediate body and the pump cover, bolt the intermediate body to the pump cover, and then bolt the intermediate body to the transition body to complete the installation. Therefore, the double gear pump unit of this solution has a simple structure and is easy to install.

[0013] Preferably, the axle of the first driving wheel is connected to the main body via a first front bearing, and the axle is connected to the transition body via a first rear bearing; the axle of the first driven wheel is connected to the main body via a second front bearing, and the axle is connected to the transition body via a second rear bearing;

[0014] The axle of the second driving wheel is connected to the intermediate body through the third front bearing, and the axle is connected to the pump cover through the third rear bearing; the axle of the second driven wheel is connected to the intermediate body through the fourth front bearing, and the axle is connected to the pump cover through the fourth rear bearing.

[0015] As an advantage, it also includes a bearing lubrication oil circuit, which includes:

[0016] a first annular cavity formed between the second front bearing and the first driven wheel;

[0017] An oil inlet channel connecting the first oil pressure chamber and the first annular chamber;

[0018] a main body oil chamber, disposed in the main body and communicating with the holes where the first front bearing and the second front bearing are located;

[0019] A transition oil chamber is provided in the transition body and is in communication with the holes where the first rear bearing and the second rear bearing are located;

[0020] A first axial hole and a radial hole are provided in the axle of the first driven wheel, the radial hole connects the first annular cavity and the first axial through hole, and the first axial hole connects the main oil cavity and the transition oil cavity. During the operation of the double gear pump unit, when the oil flows through the first oil pressure cavity, a small amount of oil will enter the first annular cavity through the oil inlet channel, and enter the main oil cavity and the transition oil cavity through the radial hole and the first axial hole. The oil in the main oil cavity will automatically enter between the first front bearing and the corresponding axle, and between the second front bearing and the corresponding axle, to lubricate the first front bearing and the second front bearing and the corresponding axle; the oil in the transition oil cavity will automatically enter between the first rear bearing and the corresponding axle, and between the second rear bearing and the corresponding axle, to lubricate the first rear bearing and the second rear bearing and the corresponding axle; thereby lubricating the axle and bearing of the first gear pump, and ensuring the lubrication performance of the axle and bearing of the first gear pump.

[0021] Preferably, the bearing lubrication oil circuit further includes:

[0022] A second axial hole is provided in the wheel shaft of the second driving wheel, the transition oil chamber is communicated with the communicating hole, and the oil in the communicating hole can flow into the second axial hole;

[0023] a pump cover oil chamber, which is provided in the pump cover and is in communication with the holes where the third rear bearing and the fourth rear bearing are located;

[0024] an intermediate body oil chamber, disposed within the intermediate body and communicating with the hole where the fourth front bearing is located;

[0025] A third axial hole is provided in the axle of the second driven wheel, connecting the pump cover oil chamber and the intermediate body oil chamber. Thus, during operation of the duplex gear pump assembly, the oil in the transition oil chamber enters the pump cover oil chamber through the second axial hole, and the oil in the pump cover oil chamber enters the intermediate body oil chamber through the third axial hole. The oil in the pump cover oil chamber automatically flows between the third rear bearing and the corresponding axle, as well as between the fourth rear bearing and the corresponding axle, lubricating the third and fourth rear bearings and their corresponding axles. The oil in the intermediate body oil chamber automatically flows between the fourth front bearing and the corresponding axle, lubricating the fourth front bearing and their corresponding axles. This lubricates the axle and bearings of the second gear pump, ensuring their lubrication performance.

[0026] Preferably, the second chamber includes a second oil suction chamber and a second oil pressure chamber, and the bearing lubricating oil circuit further includes an intermediate body oil passage provided in the intermediate body, the intermediate body oil passage connecting the intermediate body oil chamber and the second oil suction chamber. During operation of the double gear pump unit, since the pressure in the second oil suction chamber is lower than the pressure in the first oil pressure chamber, the oil entering the oil chamber of the pump cover can flow back into the second oil suction chamber through the intermediate body oil passage, forming a circulation of lubricating oil, which is conducive to the continuous entry of oil to lubricate the axles and bearings of the first gear pump and the second gear pump, further ensuring the lubrication effect of the pump cover bearings.

[0027] Preferably, the system further comprises a motor, wherein the axle of the first driving wheel extends outside the main body, and the motor is connected to the axle of the first driving wheel located outside the main body. The motor drives the axle of the first driving wheel to rotate, and the axle of the first driving wheel drives the axle of the second driving wheel to rotate, thereby driving the first gear pump and the second gear pump to operate.

[0028] Preferably, the device further comprises a connecting cover with openings at both ends, one end of the connecting cover being bolted to the outer wall of the main body, the motor being bolted to the other end of the connecting cover, the motor being connected to the axle of the first driving wheel located outside the main body via a coupling, and the coupling being located within the connecting cover. This facilitates installation of the motor and allows the coupling to be accommodated by the connecting cover.

[0029] Preferably, a sealing ring is provided between the main body and the transition body, a sealing ring is provided between the transition body and the intermediate body, and a sealing ring is provided between the intermediate body and the pump cover. In this way, the sealing performance of the pump body is ensured and the problem of oil leakage during the operation of the oil pump is effectively reduced.

[0030] Preferably, the main body and the transition body are positioned by positioning pins, thereby ensuring the positioning accuracy between the main body and the transition body.

[0031] Preferably, the axle of the first driving wheel is connected to the axle of the second driven wheel via a coupling, so that the axle of the first driving wheel and the axle of the second driven wheel are easily connected, thereby facilitating the installation of the double gear pump unit.

[0032] The beneficial effects of the utility model are:

[0033] First, the structure is simple and easy to install.

[0034] Secondly, it can automatically lubricate the axle and bearings during the operation of the double gear pump unit to ensure the lubrication performance of the axle and bearings, thereby improving the transmission stability and service life of the double gear pump unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 The utility model is a schematic diagram of an axial cross-sectional structure of a double gear pump unit.

[0036] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle.

[0037] Figure 3 It is a cross-sectional schematic diagram of the first gear pump of a double gear pump unit of the present invention.

[0038] Figure 4 It is a cross-sectional schematic diagram of the second gear pump of a double gear pump unit of the present invention.

[0039] In the picture:

[0040] Pump body 1, main body 1.1, transition body 1.2, intermediate body 1.3, pump cover 1.4, connecting hole 1.5;

[0041] First gear pump 2, first driving wheel 2.1, first driven wheel 2.2, first oil suction chamber 2.3, first oil pressure chamber 2.4;

[0042] Second gear pump 3, second driving wheel 3.1, second driven wheel 3.2, second oil suction chamber 3.3, second oil pressure chamber 3.4;

[0043] First front bearing 4.1, first rear bearing 4.2;

[0044] Second front bearing 5.1, second rear bearing 5.2;

[0045] third front bearing 6.1, third rear bearing 6.2;

[0046] Fourth front bearing 7.1, fourth rear bearing 7.2;

[0047] Bearing lubrication oil passage 8, first annular cavity 8.0, main body oil cavity 8.1, transition oil cavity 8.2, first axial hole 8.3, pump cover oil cavity 8.4, second axial hole 8.5, intermediate body oil cavity 8.6, third axial hole 8.7, radial hole 8.8, oil inlet passage 8.9;

[0048] Motor 9;

[0049] Connecting cover 10;

[0050] Strengthen bearing 11;

[0051] Oil seal 12. DETAILED DESCRIPTION

[0052] Specific embodiment 1, as Figure 1 、 Figure 3 、 Figure 4 As shown, a double gear pump unit includes a pump body 1, a first gear pump 2 and a second gear pump 3.

[0053] Pump body 1 comprises a main body 1.1, a transition body 1.2, an intermediate body 1.3, and a pump cover 1.4, which are connected in sequence by bolts. Specifically, main body 1.1 and transition body 1.2 are bolted together, intermediate body 1.3 is bolted together, and pump cover 1.4 is bolted together. A first cavity is formed between main body 1.1 and transition body 1.2, a second cavity is formed between intermediate body 1.3 and pump cover 1.4, and a connecting hole 1.5 is provided in transition body 1.2, connecting the first and second cavities.

[0054] The first gear pump 2 includes a first driving wheel 2.1 and a first driven wheel 2.2 disposed in a first cavity. Both the first driving wheel 2.1 and the first driven wheel 2.2 are gears, and both the first driving wheel 2.1 and the first driven wheel 2.2 are engaged with each other. The first cavity includes a first oil suction cavity 2.3 and a first oil pressure cavity 2.4.

[0055] The second gear pump 3 includes a second driving wheel 3.1 and a second driven wheel 3.2 disposed within the second chamber. Both the second driving wheel 3.1 and the second driven wheel 3.2 are gears that mesh with each other. The second chamber includes a second oil suction chamber 3.3 and a second oil pressure chamber 3.4.

[0056] The axle of the first driving wheel 2.1 is coaxial with the axle of the second driving wheel 3.1. The axle of the first driving wheel 2.1 is connected to the axle of the second driving wheel 3.1 at the connecting hole 1.5. In this embodiment, the axle of the first driving wheel 2.1 is connected to the axle of the second driving wheel 3.1 at the connecting hole 1.5, which means that the axle of the first driving wheel 2.1 passes through the connecting hole 1.5 and is connected to the axle of the second driving wheel 3.1, or the axle of the second driving wheel 3.1 passes through the connecting hole 1.5 and is connected to the axle of the first driving wheel 2.1, or the axle of the first driving wheel 2.1 and the axle of the second driving wheel 3.1 both extend into the connecting hole 1.5 and are connected.

[0057] In the double gear pump unit of this embodiment, since the pump body 1 includes a main body 1.1, a transition body 1.2, an intermediate body 1.3 and a pump cover 1.4 connected in sequence by bolts, a first cavity is formed between the main body 1.1 and the transition body 1.2, a second cavity is formed between the intermediate body 1.3 and the pump cover 1.4, and a connecting hole 1.5 connecting the first cavity and the second cavity is provided in the transition body 1.2; based on this, when the double gear pump unit is actually installed,

[0058] First install the first gear pump 2, install the first driving wheel 2.1 and the first driven wheel 2.2 in the first cavity between the main body 1.1 and the transition body 1.2, and then connect the main body 1.1 and the transition body 1.2 with bolts;

[0059] Next, the second gear pump 3 is assembled by bolting the intermediate body 1.3 to the transition body 1.2, installing the second driving pulley 3.1 and the second driven pulley 3.2 in the second cavity between the intermediate body 1.3 and the pump cover 1.4, and then bolting the intermediate body 1.3 to the pump cover 1.4 to complete the assembly. Alternatively, the second driving pulley 3.1 and the second driven pulley 3.2 in the second cavity between the intermediate body 1.3 and the pump cover 1.4 are installed, bolting the intermediate body 1.3 to the pump cover 1.4, and then bolting the intermediate body 1.3 to the transition body 1.2 to complete the assembly. Thus, the double gear pump unit of this embodiment has a simple structure and is easy to install.

[0060] Specific embodiment 2, as Figure 1 、 Figure 3 、 Figure 4 As shown, a double gear pump unit includes a pump body 1, a first gear pump 2 and a second gear pump 3.

[0061] Pump body 1 comprises a main body 1.1, a transition body 1.2, an intermediate body 1.3, and a pump cover 1.4, which are connected in sequence by bolts. Specifically, main body 1.1 and transition body 1.2 are bolted together, intermediate body 1.3 is bolted together, and pump cover 1.4 is bolted together. A first cavity is formed between main body 1.1 and transition body 1.2. A second cavity is formed between intermediate body 1.3 and pump cover 1.4. Transition body 1.2 is provided with a connecting hole 1.5 that connects the first and second cavities.

[0062] A sealing ring is installed between the main body 1.1 and the transition body 1.2. A sealing ring is installed between the transition body 1.2 and the intermediate body 1.3. A sealing ring is installed between the intermediate body 1.3 and the pump cover 1.4. This ensures the sealing performance of the pump body 1 and effectively reduces oil leakage during operation.

[0063] The first gear pump 2 includes a first driving wheel 2.1 and a first driven wheel 2.2, both of which are gears, meshing with each other. The first chamber includes a first oil suction chamber 2.3 and a first oil pressure chamber 2.4. The main body 1.1 is provided with a first oil inlet and a first oil outlet. The first oil inlet communicates with the first oil suction chamber 2.3, while the first oil outlet communicates with the first oil pressure chamber 2.4.

[0064] The axle of the first driving wheel 2.1 is connected to the main body 1.1 via the first front bearing 4.1. The axle of the first driving wheel 2.1 is connected to the transition body 1.2 via the first rear bearing 4.2. The axle of the first driven wheel 2.2 is connected to the main body 1.1 via the second front bearing 5.1, and the axle of the first driven wheel 2.2 is connected to the transition body 1.2 via the second rear bearing 5.2. In this embodiment, the main body 1.1 is provided with a hole for mounting the first front bearing 4.1 and the second front bearing 5.1, and the hole is connected to the first cavity, and the first front bearing 4.1 and the second front bearing 5.1 are mounted in the corresponding holes; the transition body 1.2 is provided with a hole for mounting the first rear bearing 4.2 and the second rear bearing 5.2, and the hole is connected to the first cavity, and the first rear bearing 4.2 and the second rear bearing 5.2 are mounted in the corresponding holes.

[0065] The second gear pump 3 includes a second driving wheel 3.1 and a second driven wheel 3.2, disposed within a second chamber. Both the second driving wheel 3.1 and the second driven wheel 3.2 are gears, meshing with each other. The second chamber includes a second oil suction chamber 3.3 and a second oil pressure chamber 3.4. The intermediate body 1.3 is provided with a second oil inlet and a second oil outlet. The second oil inlet communicates with the second oil suction chamber 3.3, while the second oil outlet communicates with the second oil pressure chamber 3.4.

[0066] The axle of the second driving wheel 3.1 is connected to the intermediate body 1.3 via the third front bearing 6.1, and the axle of the second driving wheel 3.1 is connected to the pump cover 1.4 via the third rear bearing 6.2. The axle of the second driven wheel 3.2 is connected to the intermediate body 1.3 via the fourth front bearing 7.1, and the axle of the second driven wheel 3.2 is connected to the pump cover 1.4 via the fourth rear bearing 7.2. In this embodiment, the intermediate body 1.3 is provided with holes for mounting the third front bearing 6.1 and the fourth front bearing 7.1, and these holes are connected to the second cavity. The third front bearing 6.1 and the fourth front bearing 7.1 are installed in the corresponding holes. The pump cover 1.4 is provided with holes for mounting the third rear bearing 6.2 and the fourth rear bearing 7.2, and these holes are connected to the second cavity. The third rear bearing 6.2 and the fourth rear bearing 7.2 are installed in the corresponding holes.

[0067] The axle of the first driving wheel 2.1 is coaxial with the axle of the second driving wheel 3.1. The axle of the first driving wheel 2.1 is connected to the axle of the second driving wheel 3.1 at the connecting hole 1.5. In this embodiment, the axle of the first driving wheel 2.1 is connected to the axle of the second driving wheel 3.1 at the connecting hole 1.5, which means that the axle of the first driving wheel 2.1 passes through the connecting hole 1.5 and is connected to the axle of the second driving wheel 3.1, or the axle of the second driving wheel 3.1 passes through the connecting hole 1.5 and is connected to the axle of the first driving wheel 2.1, or the axle of the first driving wheel 2.1 and the axle of the second driving wheel 3.1 both extend into the connecting hole 1.5 and are connected. In this embodiment, the axle of the first driving wheel 2.1 is connected to the axle of the second driven wheel 3.2 via a coupling, and the coupling is located in the connecting hole 1.5.

[0068] In the double gear pump unit of this embodiment, since the pump body 1 includes a main body 1.1, a transition body 1.2, an intermediate body 1.3 and a pump cover 1.4 connected in sequence by bolts, a first cavity is formed between the main body 1.1 and the transition body 1.2, a second cavity is formed between the intermediate body 1.3 and the pump cover 1.4, and a connecting hole 1.5 connecting the first cavity and the second cavity is provided in the transition body 1.2; based on this, when the double gear pump unit is actually installed,

[0069] First install the first gear pump 2, install the first driving wheel 2.1 and the first driven wheel 2.2 in the first cavity between the main body 1.1 and the transition body 1.2, and then connect the main body 1.1 and the transition body 1.2 with bolts;

[0070] Next, the second gear pump 3 is assembled by bolting the intermediate body 1.3 to the transition body 1.2, installing the second driving pulley 3.1 and the second driven pulley 3.2 in the second cavity between the intermediate body 1.3 and the pump cover 1.4, and then bolting the intermediate body 1.3 to the pump cover 1.4 to complete the assembly. Alternatively, the second driving pulley 3.1 and the second driven pulley 3.2 in the second cavity between the intermediate body 1.3 and the pump cover 1.4 are installed, bolting the intermediate body 1.3 to the pump cover 1.4, and then bolting the intermediate body 1.3 to the transition body 1.2 to complete the assembly. Thus, the double gear pump unit of this embodiment has a simple structure and is easy to install.

[0071] Specifically, such as Figure 1 As shown, the double gear pump unit also includes a motor 9. The axle of the first driving wheel 2.1 extends outside the main body 1.1. The motor 9 is connected to the axle of the first driving wheel 2.1 located outside the main body 1.1. The motor 9 drives the axle of the first driving wheel 2.1 to rotate, and the axle of the first driving wheel 2.1 drives the axle of the second driving wheel 3.1 to rotate, thereby driving the first gear pump 2 and the second gear pump 3 to operate. The specific operation of the double gear pump of this embodiment is as follows:

[0072] like Figure 1 、 Figure 3 、 Figure 4 As shown, the motor 9 drives the axle of the first driving wheel 2.1 to rotate, causing the first driving wheel 2.1 to mesh with the first driven wheel 2.2 for rotation. During this process, the meshing teeth of the first driving wheel 2.1 and the first driven wheel 2.2 in the first oil suction chamber 2.3 gradually disengage, increasing the sealed volume and forming a partial vacuum. Under the action of atmospheric pressure, oil enters the first oil suction chamber 2.3. The first driving wheel 2.1 and the first driven wheel 2.2 successively mesh and rotate, bringing oil into the first oil pressure chamber 2.4. At the same time, the gap between the meshing teeth of the first driving wheel 2.1 and the first driven wheel 2.2 gradually decreases with rotation, increasing the oil pressure, so that the oil brought from the first oil suction chamber 2.3 to the first oil pressure chamber 2.4 is discharged from the pump through the first oil outlet.

[0073] The axle of the first driving wheel 2.1 drives the axle of the second driving wheel 3.1 to rotate, causing the second driving wheel 3.1 to mesh and rotate with the second driven wheel 3.2. During this process, the meshing teeth of the second driving wheel 3.1 and the second driven wheel 3.2 in the second oil suction chamber 3.3 gradually disengage, increasing the sealed volume and forming a partial vacuum. Under the action of atmospheric pressure, oil enters the second oil suction chamber 3.3. The second driving wheel 3.1 and the second driven wheel 3.2 successively mesh and rotate, drawing oil into the second oil pressure chamber 3.4. At the same time, the gap between the meshing teeth of the second driving wheel 3.1 and the second driven wheel 3.2 gradually decreases with their rotation, increasing the oil pressure. As a result, the oil drawn from the second oil suction chamber 3.3 to the second oil pressure chamber 3.4 is discharged from the pump through the second oil outlet.

[0074] Further, such as Figure 1 As shown, the twin gear pump unit also includes a connecting cover 10 with two open ends. One end of the connecting cover 10 is bolted to the outer wall of the main body 1.1. The motor 9 is also bolted to the other end of the connecting cover 10. The motor 9 is connected to the axle of the first driving wheel 2.1 located outside the main body 1.1 via a coupling, which is located within the connecting cover 10. This facilitates the installation of the motor 9 and accommodates the coupling within the connecting cover 10.

[0075] A reinforced bearing 11 is provided between the axle of the first driving wheel 2.1 and the main body 1.1 to improve the stability of the axle of the first driving wheel 2.1. An oil seal 12 is provided between the axle of the first driving wheel 2.1 and the main body 1.1.

[0076] Furthermore, the main body 1.1 and the transition body 1.2 are positioned by positioning pins. Both the main body 1.1 and the transition body 1.2 are provided with positioning holes that cooperate with the positioning pins. In this way, the positioning accuracy between the main body 1.1 and the transition body 1.2 is guaranteed.

[0077] Specific embodiment 3: The rest of the structure of this embodiment refers to specific embodiment 1 or specific embodiment 2, except that:

[0078] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 As shown, the double gear pump unit also includes a bearing lubricating oil circuit 8. The bearing lubricating oil circuit 8 includes a first annular cavity 8.0, an oil inlet channel 8.9, a main oil cavity 8.1, a transition oil cavity 8.2, and a first axial hole 8.3 and a radial hole 8.8 provided in the axle of the first driven wheel 2.2.

[0079] The first annular cavity 8.0 is formed between the second front bearing 5.1 and the first driven wheel 2.2. The first annular cavity 8.0 is located in the hole where the second front bearing 5.1 is located and is arranged around the axle of the first driven wheel 2.2.

[0080] The oil inlet channel 8.9 connects the first oil pressure chamber 2.4 with the first annular chamber 8.0. The oil inlet channel 8.9 is located between the end surface of the first driven pulley 2.2 facing the second front bearing 5.1 and the inner wall of the first chamber. In this embodiment, a lubricating oil groove is provided on the inner wall of the first chamber near the second front bearing 5.1. The end surface of the first driven pulley 2.2 blocks the notch of the lubricating oil groove. This lubricating oil groove constitutes the oil inlet channel 8.9.

[0081] The main body oil chamber 8.1 is provided in the main body 1.1 and is in communication with the holes where the first front bearing 4.1 and the second front bearing 5.1 are located. An oil seal 12 is located between the reinforcement bearing 11 and the main body oil chamber 8.1.

[0082] The transition oil chamber 8.2 is provided in the transition body 1.2 and is in communication with the holes where the first rear bearing 4.2 and the second rear bearing 5.2 are located.

[0083] The first axial hole 8.3 extends axially along the axle of the first driven wheel 2.2 and penetrates both ends of the axle of the first driven wheel 2.2. The radial hole 8.8 connects the first annular cavity 8.0 with the first axial through hole. The first axial hole 8.3 connects the main oil cavity 8.1 with the transition oil cavity 8.2.

[0084] During the operation of the double gear pump unit, when the oil flows through the first oil pressure chamber 2.4, a small amount of oil will enter the first annular chamber 8.0 through the oil inlet channel 8.9, and enter the main oil chamber 8.1 and the transition oil chamber 8.2 through the radial hole 8.8 and the first axial hole 8.3. The oil in the main oil chamber 8.1 will automatically flow into the space between the first front bearing 4.1 and the corresponding wheel axle, as well as between the second front bearing 5.1 and the corresponding wheel axle, to lubricate the first front bearing 4.1 and the second front bearing 5.1 and the corresponding wheel axle; the oil in the transition oil chamber 8.2 will automatically flow into the space between the first rear bearing 4.2 and the corresponding wheel axle, as well as between the second rear bearing 5.2 and the corresponding wheel axle, to lubricate the first rear bearing 4.2 and the second rear bearing 5.2 and the corresponding wheel axle; thereby lubricating the wheel axle and bearings of the first gear pump 2, ensuring the lubrication performance of the wheel axle and bearings of the first gear pump 2.

[0085] Furthermore, the bearing lubrication oil circuit 8 also includes a second axial hole 8.5 in the axle of the second driving wheel 3.1, a pump cover oil chamber 8.4, an intermediate body oil chamber 8.6, and a third axial hole 8.7 in the axle of the second driven wheel 3.2. The transition oil chamber 8.2 communicates with the connecting hole 1.5, which in turn communicates with the hole where the third front bearing 6.1 is located. Oil within the connecting hole 1.5 can flow into the second axial hole 8.5. The pump cover oil chamber 8.4 is located within the pump cover 1.4 and communicates with the holes where the third rear bearing 6.2 and the fourth rear bearing 7.2 are located. In this embodiment, the pump cover oil chamber 8.4 comprises two interconnected cavities: one cavity communicates with the hole where the third rear bearing 6.2 is located, and the other cavity communicates with the hole where the fourth rear bearing 7.2 is located. The intermediate body oil chamber 8.6 is located within the intermediate body 1.3 and communicates with the hole where the fourth front bearing 7.1 is located. The third axial hole 8.7 connects the pump cover oil chamber 8.4 with the intermediate body oil chamber 8.6.

[0086] In this way, during the operation of the double gear pump unit, the oil in the transition oil chamber 8.2 will enter the pump cover oil chamber 8.4 through the second axial hole 8.5, and the oil in the pump cover oil chamber 8.4 will enter the intermediate body oil chamber 8.6 through the third axial hole 8.7. The oil in the pump cover oil chamber 8.4 will automatically enter between the third rear bearing 6.2 and the corresponding wheel axle, as well as between the fourth rear bearing 7.2 and the corresponding wheel axle, to lubricate the third rear bearing 6.2 and the fourth rear bearing 7.2 and the corresponding wheel axle; the oil in the intermediate body oil chamber 8.6 will automatically enter between the fourth front bearing 7.1 and the corresponding wheel axle, to lubricate the fourth front bearing 7.1 and the corresponding wheel axle; thereby lubricating the wheel axle and bearings of the second gear pump 3, ensuring the lubrication performance of the wheel axle and bearings of the second gear pump 3.

[0087] Furthermore, bearing lubrication oil circuit 8 also includes an intermediate oil passage disposed within intermediate body 1.3, connecting intermediate oil chamber 8.6 with second oil suction chamber 3.3. During operation of the dual gear pump unit, because the pressure within second oil suction chamber 3.3 is lower than that within first oil pressure chamber 2.4, oil entering pump cover oil chamber 8.4 can flow back into second oil suction chamber 3.3 through the intermediate oil passage, creating a lubricating oil circulation system. This facilitates continuous lubrication of the axles and bearings of first and second gear pumps 2 and 3, further ensuring effective lubrication of the bearings in pump cover 1.4.

[0088] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent transformation of the above embodiment based on the technical essence of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A double gear pump unit, characterized in that: include: The pump body comprises a main body, a transition body, an intermediate body and a pump cover connected in sequence by bolts, a first cavity is formed between the main body and the transition body, a second cavity is formed between the intermediate body and the pump cover, and a connecting hole connecting the first cavity and the second cavity is provided in the transition body; The first gear pump includes a first driving wheel and a first driven wheel arranged in a first cavity, and the first cavity includes a first oil suction cavity and a first oil pressure cavity; The second gear pump includes a second driving wheel and a second driven wheel arranged in the second cavity. The wheel shaft of the first driving wheel is connected to the wheel shaft of the second driving wheel at the communicating hole.

2. The double gear pump unit according to claim 1, characterized in that: The axle of the first driving wheel is connected to the main body through a first front bearing, and the axle is connected to the transition body through a first rear bearing; the axle of the first driven wheel is connected to the main body through a second front bearing, and the axle is connected to the transition body through a second rear bearing; The axle of the second driving wheel is connected to the intermediate body through the third front bearing, and the axle is connected to the pump cover through the third rear bearing; the axle of the second driven wheel is connected to the intermediate body through the fourth front bearing, and the axle is connected to the pump cover through the fourth rear bearing.

3. The double gear pump unit according to claim 2, characterized in that: Also included is a bearing lubrication oil circuit, which includes: a first annular cavity formed between the second front bearing and the first driven wheel; An oil inlet channel connecting the first oil pressure chamber and the first annular chamber; a main body oil chamber, disposed in the main body and communicating with the holes where the first front bearing and the second front bearing are located; A transition oil chamber is provided in the transition body and is in communication with the holes where the first rear bearing and the second rear bearing are located; A first axial hole and a radial hole are provided in the wheel shaft of the first driven wheel. The radial hole communicates with the first annular cavity and the first axial through hole. The first axial hole connects the main oil cavity and the transition oil cavity.

4. The double gear pump unit according to claim 3, characterized in that: The bearing lubrication oil circuit also includes: A second axial hole is provided in the wheel shaft of the second driving wheel, the transition oil chamber is communicated with the communicating hole, and the oil in the communicating hole can flow into the second axial hole; a pump cover oil chamber, which is provided in the pump cover and is in communication with the holes where the third rear bearing and the fourth rear bearing are located; an intermediate body oil chamber, disposed within the intermediate body and communicating with the hole where the fourth front bearing is located; A third axial hole is provided in the wheel shaft of the second driven wheel, and the third axial hole is connected with the oil cavity of the pump cover and the oil cavity of the intermediate body.

5. The double gear pump unit according to claim 4, characterized in that: The second cavity includes a second oil suction cavity and a second oil pressure cavity, and the bearing lubricating oil circuit also includes an intermediate body oil passage arranged in the intermediate body, and the intermediate body oil passage connects the intermediate body oil cavity and the second oil suction cavity.

6. The double gear pump unit according to any one of claims 1 to 5, characterized in that: It also includes a motor, the axle of the first driving wheel extends out of the outside of the main body, and the motor is connected to the axle of the first driving wheel located outside the main body.

7. The double gear pump unit according to claim 6, characterized in that: It also includes a connecting cover with openings at both ends, one end of the connecting cover is connected to the outer wall of the main body by bolts, the motor is connected to the other end of the connecting cover by bolts, the motor is connected to the axle of the first driving wheel located outside the main body by a coupling, and the coupling is located inside the connecting cover.

8. The double gear pump unit according to any one of claims 1 to 5, characterized in that: A sealing ring is provided between the main body and the transition body, a sealing ring is provided between the transition body and the intermediate body, and a sealing ring is provided between the intermediate body and the pump cover.

9. The double gear pump unit according to any one of claims 1 to 5, characterized in that: The main body and the transition body are positioned by positioning pins.

10. The double gear pump unit according to any one of claims 1 to 5, characterized in that: The axle of the first driving wheel is connected to the axle of the second driven wheel through a coupling.

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