JPH0442551Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a dual gear pump in which a first pump and a second pump are provided in series.

(Prior Art) A double gear pump is provided with a first pump 101 and a second pump 102 in series as shown in FIG. 12, with respective drive shafts 103 and 104 connected in series. Casing 1 of first pump 101
05 and the casing 106 of the second pump 102 are fastened to each other with bolts 107. However, in the conventional dual gear pump of this type, one casing 10 is
5, a filter 109 for filtering oil to the first pump 101 and the second pump 102 is attached to the filter bracket 108, and one of the casings 105 is provided with an inlet 110, and the inlet 110 A first suction passage 111 is provided that communicates between the inside of the first pump 101 and the inside of the first pump 101 .
A second suction flow path 112 is provided which is branched from the middle and communicates with the inside of the second pump 102, and the drive shaft 103,
104 causes oil to be sucked in from the suction port 110 through the filter 109, and as shown by the arrows, from each suction passage 111, 112 to each discharge passage 11.
3,114.

(Problems to be Solved by the Invention) However, in the conventional case, it is necessary to attach the filter bracket 108 to the casing 105, making it troublesome to attach the filter 109, and the suction port through which the oil passing through the filter 109 is sucked. Since the pump 110 is located on one side of the pump 101,
There was a problem in that oil was difficult to reach the pump 102 that was farther from the suction port 110.

In view of the above problems, the present invention eliminates the need for installing a special filter bracket, and makes it possible to reliably and evenly supply oil to both pumps.

(Means for solving the problem) The technical means of the present invention for solving this technical problem is that the first pump 2 and the second pump 3 are provided in series, and the respective drive shafts 11 and 16 In a dual gear pump in which the
3 is provided in an outwardly projecting shape, and the intermediate plate 43
By tightening together the casing 4 of the first pump 2 and the casing 5 of the second pump 3,
The inlet 25 of each pump 2, 3 is fixed to the casings 4, 5, and the intermediate plate 43 has an inlet port 25 of each pump 2, 3.
A suction oil passage 46 communicating with the suction oil passages 25B is provided, and a filter 47 for filtering oil sent to the suction oil passage 46 is provided on the outwardly projecting portion of the intermediate plate 43.

(Function) The oil supplied to the first pump 2 and the second pump 3 passes through the filter 47 and is filtered there, and then passes through the suction oil passage 46 to each suction port of the first pump 2 and the second pump 3. 25A and 25B, and is supplied into the first pump 2 and the second pump 3 through equal paths.

(Embodiment) The present invention will be explained below according to the illustrated embodiment. Figs. 1 to 3 show a double gear pump installed inside the tractor body, and in the figure, 2 indicates a large capacity pump. One pump is used to send hydraulic oil to the hydraulic system for lifting and lowering work equipment. Reference numeral 3 denotes a second pump of small capacity, which is used to send hydraulic oil to the power steering hydraulic system, and is connected in series with the first pump 2.

4 is a casing of the first pump 2, and 5 is a casing of the second pump 3, which are positioned by pins 6, 6. A cover 7 closes the outer end surface of the casing 5 of the second pump 3. The casings 4, 5 and the cover 7 are connected by bolts 8...

Reference numerals 9 and 10 denote a pair of gears that mesh with each other built into the casing 4 of the first pump 2. One is the first drive gear 9 and is formed integrally with the first drive shaft 11, and the other is the first driven gear 9. First driven shaft 12 with gear 10
It is integrally molded with. The first drive shaft 11 and the first driven shaft 12 are rotatably supported via metals 13 . Further, a rectangular parallelepiped-shaped connecting portion 11a projects from the inner end surface of the first drive shaft 11.

14 and 15 are a pair of gears that mesh with each other built into the casing 5 of the second pump 3, one of which is the second drive gear 14 and is molded integrally with the second drive shaft 16, and the other is the second driven gear. The gear 15 is formed integrally with the second driven shaft 17. The second drive shaft 16 and the second driven shaft 17 are rotatably supported via metals 13 . Further, a rectangular parallelepiped-shaped connecting portion 16a projects from the inner end surface of the second drive shaft 16.

A connecting member 18 is rotatably fitted to the inner end surface of the casing 5 of the second pump 3. Connecting portions 11a and 16a of both drive shafts 11 and 16 are fitted into the connecting member 18 so as not to rotate relative to each other, thereby connecting both drive shafts 11 and 16.

The first drive shaft 11 is connected to the casing 4 of the first pump 2
A power receiving gear 20 is spline-fitted to the outer end protruding from the casing 4 through an oil seal 19. A power take-off gear 21 is meshed with the power receiving gear 20, and the power take-off gear 21 is spline-fitted to the tip of a camshaft 22 for driving a fuel injection pump serving as a drive source. Here, the power receiving gear 20 and the power extraction gear 21 are covered with a cover body 23, and the cover body 24 of the camshaft 22 is attached to a crankcase (not shown) of the engine.

25A is a first suction port formed in the casing 4 of the first pump 2; 25B is a second suction port formed in the casing 5 of the second pump 3. 26 is a first suction flow path formed in the casing 4 of the first pump 2, and communicates the first suction port 25A with the inside of the first pump 2. 27 is a second suction flow path formed in the casing 5, and communicates the second suction port 25B with the inside of the second pump 3.

Reference numerals 28 and 29 indicate first and second discharge passages for hydraulic oil formed in each of the casings 4 and 5.
5 It communicates with the outside.

The gears 9, 10, 14, 15 are driven by the rotation of the drive shafts 11, 16, and the suction port 25 is driven by the rotation of the drive shafts 11, 16.
Oil is sucked in from A and 25B, and as shown by arrows in FIG.
8 and 29 before being discharged.

Second drive shaft 16, first and second driven shafts 12, 17
First, second, and third drain passages 30, 31, and 32 are formed therein, respectively, passing through their respective axes.

The casing 4 of the first pump 2 includes a first drain reservoir 33 of which the inner end surface of the oil seal 19 forms part of its inner periphery, and a second drain channel 31 of the first driven shaft 12.
A second drain reservoir 34 is formed which is connected to the drain reservoir 34 . The first drain reservoir 33 and the second drain reservoir 34 are communicated through a fourth drain flow path 35.

A third drain reservoir 36 connected to the first drain passage 30 of the second drive shaft 16 and a fourth drain reservoir 37 connected to the third drain passage 32 of the second driven shaft 17 are formed in the cover 7. There is.

Further, a fifth drain passage 38 communicating with the second suction passage 27 is formed across the casing 5 of the second pump 3 and the cover 7.

A sixth drain passage 39 and a seventh drain passage 40 are formed in the cover 7 to communicate the third drain reservoir 36 and the fourth drain reservoir 37 with the fifth drain passage 38, respectively.

43 is an intermediate plate provided between the first pump 2 and the second pump 3 in an outwardly projecting manner;
The casing 4 of the second pump 3, the casing 5 of the second pump 3, and the cover 7 are fastened together with bolts 8, and are fixed to the casings 4 and 5.
The intermediate plate 43 is provided with a pin hole through which the pin 6 is inserted, a bolt hole 45 through which the bolt 8 is communicated, and a shaft hole 42 through which the first drive shaft 11 is inserted.

46 is a suction oil passage provided in the intermediate plate 43;
First inlet port 25 of first pump 2 and second pump 3
A and the second suction port 25B. 47
is a filter provided on the outwardly protruding part of the intermediate plate 43, and has a case 48 and a filter element 49. It is removably screwed onto the plate 43. Reference numeral 52 denotes a suction path to the filter 47, which is opened at the outwardly projecting end of the intermediate plate 43. 53 is a suction hose connected to the suction port side of the suction path 52.
The oil sent from the suction hose 3 is then transferred to the suction path 5.
2, enters between the case 48 of the filter 47 and the filter element 49, enters the filter element 49, passes from there through the suction oil passage 47, and enters the first suction port 25A and the first suction port 25B. The air is supplied into each of the first pumps 2 and the second pumps 3 through equal routes through the first suction flow path 26 and the second suction flow path 27.

In addition, in Fig. 4 and Fig. 6, 55, 56
The recesses 57, 58 or the shaft hole 42 for the drain reservoir
This is a drain flow path that communicates with the suction oil path 46.

7 to 11 show another embodiment, in which the first suction port 25 of the first pump 2 is provided in the intermediate plate 43.
A first suction oil passage 46a that communicates with A, and a second suction oil passage 4 that communicates with the second suction port 25B of the second pump 3.
6b, and a first filter 47a communicating with the first suction oil passage 46a and a second filter 47b communicating with the second suction oil passage 46b are provided on the outward protrusion of the intermediate plate 43. Also, a first suction path 52a to the first filter 47a is connected to the intermediate plate 43.
and a second suction path 52b to the second filter 47b, and a first suction hose 53a or a second suction hose 53b is connected to the first suction path 52a or the second suction path 52b, respectively. In other respects, the configuration is similar to that of the previous embodiment.

(Effect of the invention) An intermediate plate 43 is provided between the first pump 52 and the second pump 53, and the intermediate plate 43 has
Since a suction passage 46 is provided that communicates with the suction ports 25A and 25B of each pump 2 and 3, oil is removed from the filter 47 through the suction ports 25A and 25B of each pump 2 and 3.
5B to the inside of each pump 2, 3 can be made substantially equal, and oil can be reliably and evenly supplied to the first pump 2 and the second pump 3. Further, the intermediate plate 43 is fixed to the casings 4 and 5 by being fastened together with the casing 4 of the first pump 2 and the casing 5 of the second pump 3, so that the intermediate plate 43 is fixed. There is no need for any special fixing devices.

Further, the intermediate plate 43 is provided with an outward protrusion that protrudes outward from the casings 4 and 5,
The intermediate plate 43 is provided with a suction oil passage 46 that communicates with the suction ports 25A, 25B of each pump 2, 3 from its outward protrusion.
A filter 47 for filtering the oil sent to the suction oil passage 46 is provided on the outward protrusion of the filter 47 and the suction ports 25A and 25B of the pumps 2 and 3.
The suction oil passage 46 communicating with the casings 4, 5
This eliminates the need to provide casings 4 and 5, which tend to have complicated structures, and allows the casings 4 and 5, which tend to have a complicated structure, to be made more durable with a simpler structure and less risk of damage, and the entire pump can be manufactured inexpensively and easily. . Moreover, since the filter 47 can be attached to the outwardly protruding portion of the intermediate plate 43, there is no need for a bracket for attaching the filter to the casings 4, 5. From this point of view, the casings 4, 5 can be made simpler than those with fewer irregularities. The pump as a whole can be manufactured more cheaply and easily, and its practical effects are significant.

[Brief explanation of drawings]

1 to 6 show an embodiment of the present invention,
Figure 1 is a side sectional view, Figure 2 is a plan sectional view, Figure 3 is a front view, Figure 4 is a rear view of the intermediate plate, Figure 5 is a sectional view of the same side, and Figure 6 is a front view of the same. be. 7 to 11 show other embodiments, FIG. 7 is a side sectional view, FIG. 8 is a plan sectional view, FIG. 9 is a rear view of the intermediate plate, and FIG. 10 is a side sectional view, FIG. 11 is a front view of the same. FIG. 12 is a side sectional view showing a conventional example. 2...First pump, 3...Second pump, 4,5
...Casing, 11...First drive shaft, 16...
Second drive shaft, 25A...First intake port, 25B...
Second suction port, 43... intermediate plate, 46... suction oil path, 47... filter.

Claims (1)

[Scope of utility model registration request] In a dual gear pump in which the first pump 2 and the second pump 3 are provided in series and the respective drive shafts 11 and 16 are linearly interlocked, the first pump 2
An intermediate plate 43 is provided between the casing 4 of the first pump 2 and the casing 5 of the second pump 3. The intermediate plate 43 is provided with an outward protrusion projecting outward from the casings 4 and 5, and the inlet ports 25A and 25A of each pump 2 and 3 are connected to the intermediate plate 43 from the outward protrusion. 25B, and a filter 47 for filtering oil sent to the suction oil passage 46 is provided on the outward protrusion of the intermediate plate 43. pump.