CN114593035A - Combined motor pump - Google Patents

Abstract

The invention belongs to a hydraulic combined pump, and particularly relates to a combined motor pump which comprises a front cover, a pump shell, a motor shell and a rear cover, wherein a pump driving gear and a pump driven gear which are mutually meshed are arranged in the pump shell; the baffle is provided with a hole A penetrating through the baffle from the thickness direction of the baffle, a gear shaft of the pump driving gear is in transmission connection with a gear shaft of the motor driving gear at the hole A of the baffle, and the outer side surface of the baffle is provided with a vent plug connector communicated with the hole A; the pump driving gear and the pump shell are provided with an oil seal I at a position close to a hole A of the partition plate, and the motor driving gear and the motor shell are provided with an oil seal II at a position close to the hole A of the partition plate. When oil blow-by occurs, the oil is discharged from the breather plug, preventing oil blow-by from occurring between the drive motor and the oil pump.

Description

A combined motor pump

technical field

The invention belongs to a hydraulic combined pump, in particular to a combined motor pump.

Background technique

The combined motor pump is a motor and pump combined structure product with working medium separation performance. This product uses the pressure oil source in the main system to drive the oil pump to work, and then transports the oil from the bottom of the gearbox to the top for lubrication. The lubricating oil of the gearbox itself is much less clean than the hydraulic system of the main engine, so the motor and the pump use two separate oil sources to work, and there can be no oil leakage between the two, and mutual contamination occurs.

In the prior art, such as Chinese patent: publication number CN211449019U, authorization announcement date of September 8, 2020, a two-way sealing ring is installed between the motor and the pump to achieve mutual sealing between the driving motor and the oil pump, but in the later The phenomenon of oil channeling is still found during use. The main reason is that the lubricating oil of the gearbox is too dirty and contains hard impurities such as iron filings. After long-term work, the oil seal lip is damaged, resulting in channeling between the drive motor and the pump. Oil phenomenon, when the system hydraulic oil of the drive motor escapes to the oil pump and flows into the gearbox, it will cause the system oil to decrease. In severe cases, there will be a lack of oil in the system, which will cause the system oil cylinder to not work properly, and the air intake cylinder in the system will climb and so on. When the oil in the gearbox escapes into the motor and then flows into the system, it will contaminate the entire hydraulic system, causing problems such as system valve blockage and excessive wear of parts. Therefore, the oil seal between the drive motor and the oil pump is damaged. Oil channeling has serious consequences.

The connection form of the motor-driven oil pump is usually the spline fit form. For the case where the shaft diameter is small, the inner spline hole will also be smaller. When machining the inner spline, only wire cutting can be used, and the machining accuracy is poor.

The driving motor and the oil pump in the existing motor pump are both fixed axial gap structures. In this structure, there is a gap between the sliding sleeve and the end face of the gear during operation. Therefore, the resistance of the gear pair is small when it rotates, which is beneficial for the motor to start and drive. At the same time, due to this feature, the volumetric efficiency will be low, resulting in a relatively low driving speed. Only by increasing the driving flow to ensure the working speed, the efficiency is reduced.

SUMMARY OF THE INVENTION

In order to overcome the above-mentioned shortcomings of the prior art, the present invention provides a combined motor pump, which changes the original bidirectional oil seal into two separate oil seals, which are respectively assembled on the drive motor and the oil pump.

The invention is realized through the following technical solutions: a combined motor pump, comprising a front cover, a pump casing, a motor casing and a rear cover, the pump casing is provided with a pump driving gear and a pump driven gear that mesh with each other, and the motor casing The body is provided with a motor driving gear and a motor driven gear that mesh with each other, the gear shaft of the pump driving gear is connected with the gear shaft of the motor driving gear, and also includes a partition, a front cover, a pump housing, a partition, a motor housing and The rear covers are connected in sequence; the partition plate is provided with a hole A that penetrates the partition plate from the thickness direction of the partition plate, and the gear shaft of the pump driving gear and the gear shaft of the motor driving gear are connected in a driving manner at the hole A of the partition plate. There is a vent plug interface that communicates with the hole A; the pump driving gear and the pump casing are provided with an oil seal I near the hole A of the diaphragm, and the motor driving gear and the motor casing are provided with an oil seal near the hole A of the diaphragm II.

Further, it also includes a cross connecting sleeve, and the cross connecting sleeve includes a transverse slotted hole arranged in the middle part of the left side of the cross connecting sleeve and a longitudinal slotted hole arranged in the middle part of the right side of the cross connecting sleeve; the gear shaft of the pump driving gear and the motor drive The gear shafts of the gears are connected through a cross-connecting sleeve.

Further, the transverse slotted hole of the cross connecting sleeve is communicated with the longitudinal slotted hole of the cross connecting sleeve.

Further, the gear shafts on both sides of the driving gear of the driving gear of the pump and the gear shafts on both sides of the driven gear of the driven gear of the pump are supported on the two sets of sliding sleeves I through the corresponding needle roller bearings I, located on the left side. There is a fixed side plate between the sliding sleeve I and the front cover; the gear shafts located on both sides of the driving gear of the motor driving gear and the gear shafts located on both sides of the driven gear of the driven gear of the motor are supported by the corresponding needle roller bearings II On the two sets of sliding sleeves II, floating side plates are arranged between the gear end faces on both sides of the motor and the corresponding sliding sleeves II, and the side surfaces of the sliding sleeves II are provided with W sealing rings and support bars in contact with the floating side plates.

Further, the gear shaft of the pump driving gear also extends from the pump housing to the outside of the front cover, and the gear shaft of the pump driving gear located outside the front cover is provided with a connecting spline.

Further, guide positioning pins are provided between the front cover and the pump housing, between the pump housing and the partition, between the partition and the motor housing, and between the motor housing and the rear cover.

Further, the front cover, the pump housing, the baffle, the motor housing and the rear cover are fastened and connected by bolts.

The beneficial effects of the invention are as follows: 1. Change the original two-way oil seal into two separate oil seals, which are respectively assembled on the driving motor and the oil pump, and the vent plug interface is equipped with a vent plug. The plug is discharged to prevent oil blowing between the drive motor and the oil pump. At the same time, the breather plug can prevent the outside dirt from entering the hole A of the separator and damaging the oil seal.

2. The present application adopts the form of the gear shaft with the flat head of the transmission end being matched with the cross-connecting sleeve 10. This structure greatly reduces the processing difficulty and improves the transmission accuracy.

3. The drive motor adopts the structure with axial clearance compensation, the driving speed is obviously increased, and the driving transmission efficiency is improved.

Description of drawings

Fig. 1 is the structural sectional view of the present invention;

Fig. 2 is the outline schematic diagram of the external product of the present invention;

Fig. 3 is the structural schematic diagram of the cross connection sleeve of the present invention;

Fig. 4 is the left side view of Fig. 3;

In the figure, 1, the pump driving gear, 2, the front cover, 3, the retaining ring for the hole I, 4, the skeleton oil seal, 5, the sliding sleeve I, 6, the pump housing, 7, the pump driven gear, 8, the oil seal I , 9, retaining ring for hole II, 10, cross connection sleeve, 11, W sealing ring, 12, support bar, 13, floating side plate, 14, sliding sleeve II, 15, motor driving gear, 16, bolt, 17, Needle roller bearing II, 18, rear cover, 19, motor housing, 20, motor driven gear, 21, oil seal II, 22, retaining ring for hole III, 23, vent plug interface, 24, partition plate, 25, roller Needle bearing I, 26, fixed side plate, 27, connecting spline.

Detailed ways

The present invention will be further described below according to the accompanying drawings and embodiments.

As shown in Figures 1 and 2, a combined motor pump includes a front cover 2, a pump housing 6, a partition 24, a motor housing 19 and a rear cover 18. The pump housing 6 is provided with mutually engaged pump active Gear 1 and pump driven gear 7, the motor housing 19 is provided with the motor driving gear 15 and the motor driven gear 20 that mesh with each other, the front cover 2, the pump housing 6, the partition 24, the motor housing 19 and the rear cover 18 are sequentially connected by bolts 16, and seals are provided between the front cover 2 and the pump housing 6, the pump housing 6 and the partition 24, the partition 24 and the motor housing 19, the motor housing 19 and the rear cover 18. lock up.

The gear shaft on the left side of the pump driving gear 1 also extends from the pump housing 6 to the outside of the front cover 2 , and the gear shaft of the pump driving gear 1 on the outside of the front cover 2 is provided with a connecting spline 27 , The purpose of the connecting splines 27 is to detect whether the gear pump part can work normally through the transmission work between the motor and the connecting splines 27 when leaving the factory. A skeleton oil seal 4 is provided between the gear shaft on the left side of the pump driving gear 1 and the front cover 2. The right side of the skeleton oil seal 4 is axially limited by the inner shoulder of the front cover 2, and the left side of the skeleton oil seal 4 is set on the front cover. The hole on 2 is axially limited by the retaining ring I3.

As shown in FIG. 1 , the separator 24 is provided with a hole A that penetrates through the separator 24 in the thickness direction of the separator 24 . Drive connection at hole A. The outer surface of the partition plate 24 is provided with a vent plug interface 23 that communicates with the hole A. The pump driving gear 1 and the pump housing 6 are provided with an oil seal I8 near the hole A of the partition plate 24. The left side of the oil seal I8 is axially limited by the inner shoulder of the pump housing 6, and the right side of the oil seal I8 is provided on the The hole on the pump housing 6 is axially limited by the retaining ring II9. The motor drive gear 15 and the motor housing 19 are provided with an oil seal II21 near the hole A of the partition plate 24. The left side of the oil seal II21 is axially limited by the hole provided on the motor housing 19 with a retaining ring III22. The right side is axially limited by the inner shoulder of the motor housing 19 . The vent plug interface 23 is finally equipped with a vent plug. When oil leakage occurs, the leaked oil will flow into the hole A of the partition plate 24, and flow to the outside of the combined motor pump through the vent plug installed on the vent plug interface 23. Instead of channeling directly into the drive motor or oil pump, the operator can judge whether there is oil leakage by regularly observing the condition of the breather plug, which can detect the problem as soon as possible, and has the function of oil channeling prompt protection, which effectively prevents the drive motor and the oil from leaking. The system oil is polluted or the system is short of oil caused by the mutual oil channeling between the oil pumps, which greatly improves the safety and reliability of the work.

As shown in FIGS. 1 , 3 and 4 , the transmission connection between the gear shaft on the right side of the pump driving gear 1 and the gear shaft on the left side of the motor driving gear 15 is realized by the cross connecting sleeve 10 , and the cross connecting sleeve 10 includes a set on the The horizontal slotted hole in the middle of the left side of the cross connecting sleeve 10 and the vertical slotted hole arranged in the middle part of the right side of the cross connecting sleeve 10; the gear shaft of the pump driving gear 1 is assembled with the horizontal slotted hole in the middle part of the left side of the cross connecting sleeve 10, The gear shaft of the motor driving gear 15 is assembled with the longitudinal slotted hole in the middle of the right side of the cross connecting sleeve 10 . The power transmission between the pump driving gear 1 and the motor driving gear 15 is realized by means of the cross-connection sleeve 10 as a transmission element. Specifically, as shown in FIG. 3 , the horizontal slotted hole of the cross connecting sleeve 10 communicates with the longitudinal slotted hole of the cross connecting sleeve 10 . The present application adopts the form of the gear shaft with the flat head of the transmission end being matched with the cross connecting sleeve 10, and this structure greatly reduces the processing difficulty and improves the transmission precision.

As shown in Figure 1, it includes two sets of sliding sleeves I5 and two sets of sliding sleeves II14. The gear shafts located on both sides of the driving gear of the pump driving gear 1 and the gear shafts located on both sides of the driven gear of the pump driven gear 7 pass through The corresponding needle bearing I25 is supported on the two sets of sliding sleeves I5, and a fixed side plate 26 is provided between the sliding sleeve I5 on the left side and the front cover 2. The gear shafts located on both sides of the driving gear of the motor driving gear 15 and the gear shafts located on both sides of the driven gear of the motor driven gear 20 are supported on the two sets of sliding sleeves II14 through the corresponding needle bearings II17. A floating side plate 13 is arranged between the end face of the gear and the corresponding sliding sleeve II 14 , and the side surface of the sliding sleeve II 14 is provided with a W sealing ring 11 and a support bar 12 in contact with the floating side plate 13 .

Considering the low operating pressure of the oil pump, in order to improve the overall use efficiency, the oil pump part of this application still adopts a fixed axial gap structure, and the driving motor part is changed to a structure with axial gap compensation. This structure uses the sliding sleeve II14 and The floating side plate 13, and the W seal ring 11 and the support bar 12 are installed between them. The driving oil forms pressure between the sliding sleeve II 14 and the floating side plate 13 under the action of the W seal ring 11 and the support bar 12. During pressure driving, the pressure pushes the floating side plate 13 against the end face of the gear, which reduces leakage and improves driving efficiency. At the same time, the compression amount of the W seal ring 11 is reduced to 50% of the normal high-pressure product. The starting torque generated by 11 compression is also greatly reduced. After testing, it can fully meet the requirements of use. At the same time, the driving speed is significantly increased, which improves the driving transmission efficiency.

As an improvement of this embodiment, between the front cover 2 and the pump housing 6 , between the pump housing 6 and the partition 24 , between the partition 24 and the motor housing 19 , and between the motor housing 19 and the rear cover 18 are provided guide pin. When the above components are assembled, first insert the guide and positioning pins, and the other component can be placed in alignment with the guide and positioning pins. For example, when the front cover 2 is assembled with the pump housing 6, the guide and positioning pins are first Put it into the pin hole of the front cover 2, and then insert the pin hole of the pump housing 6 into the guide pin. The purpose of the guide pin is to ensure the coaxiality of the connection. Parts are limited to facilitate subsequent tightening.

Claims (7)

1. A combined motor pump, comprising a front cover (2), a pump housing (6), a motor housing (19) and a rear cover (18), and the pump housing (6) is provided with a pump driving gear that meshes with each other (1) and the pump driven gear (7), the motor housing (19) is provided with a motor driving gear (15) and a motor driven gear (20) that mesh with each other, the gear shaft of the pump driving gear (1) and the motor The gear shaft transmission connection of the driving gear (15) is characterized in that it further comprises a partition (24), a front cover (2), a pump housing (6), a partition (24), a motor housing (19) and a rear The cover (18) is connected in sequence; the partition plate (24) is provided with a hole A which penetrates the partition plate (24) from the thickness direction of the partition plate (24), and the gear shaft of the pump driving gear (1) is connected to the motor driving gear (15). The gear shaft is connected by transmission at the hole A of the partition plate (24), and the outer side of the partition plate (24) is provided with a vent plug interface (23) that communicates with the hole A; the pump driving gear (1) is connected to the pump housing (6). ) is provided with oil seal I (8) near the hole A of the partition plate (24), and the motor drive gear (15) and the motor housing (19) are provided with oil seal II (21) near the hole A of the partition plate (24). ). 2. A combined motor pump according to claim 1, characterized in that it further comprises a cross-connecting sleeve (10), and the cross-connecting sleeve (10) comprises a transverse indentation arranged in the middle of the left side of the cross-connecting sleeve (10). The hole and the longitudinal slotted hole arranged in the middle of the right side of the cross connecting sleeve (10); the gear shaft of the pump driving gear (1) and the gear shaft of the motor driving gear (15) are drively connected through the cross connecting sleeve (10). 3. A combined motor pump according to claim 2, characterized in that: the transverse slotted hole of the cross connecting sleeve (10) communicates with the longitudinal slotted hole of the cross connecting sleeve (10). 4. A combined motor pump according to claim 1, characterized in that: the gear shafts located on both sides of the driving gear of the pump driving gear (1) and the gear shafts located on both sides of the driven gear of the pump driven gear (7) The gear shafts are supported on the two sets of sliding sleeves I(5) through corresponding needle roller bearings I(25), and a fixed side plate (26) is provided between the sliding sleeve I(5) on the left and the front cover (2). ;The gear shafts on both sides of the driving gear of the motor driving gear (15) and the gear shafts on both sides of the driven gear of the driven gear of the motor (20) are supported on the two sets of slides by the corresponding needle roller bearings II (17). On the sleeve II (14), a floating side plate (13) is provided between the gear end faces on both sides of the motor and the corresponding sliding sleeve II (14), and the side of the sliding sleeve II (14) is provided with a floating side plate (13) The W sealing ring (11) and the support strip (12) are in contact. 5. A combined motor pump according to claim 1, characterized in that: the gear shaft of the pump driving gear (1) also extends from the pump housing (6) to the outside of the front cover (2), A connecting spline (27) is provided on the gear shaft of the pump driving gear (1) located outside the front cover (2). 6. A combined motor pump according to claim 1, characterized in that: between the front cover (2) and the pump housing (6), the pump housing (6) and the partition plate (24), the partition Guide positioning pins are provided between the plate (24) and the motor housing (19), the motor housing (19) and the rear cover (18). 7. A combined motor pump according to claim 1, characterized in that: the front cover (2), the pump housing (6), the partition (24), the motor housing (19) and the rear cover ( 18) Tighten the connection with bolts (16).

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