JPH0424156Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) The present invention relates to a gear pump device.

(Prior Art) Conventionally, a gear pump device includes a cylindrical casing, at least a pair of interlocking gears installed inside the casing from one side, and bolted to the casing with the one side of the casing closed. The casing has a fluid suction flow path and a fluid discharge flow path formed therein, and the end of the drive shaft, which is interlocked and connected to the drive source, protrudes from the other side of the casing. The gears were driven by the drive shaft.

In addition, the opening of the suction passage and the opening of the discharge passage are each opened on the circumferential surface of the casing, and the outlet of the filter attachment body is configured to be attached in communication with the opening of the suction passage. It had been.

For example, as shown in Japanese Utility Model Application Publication No. 58-173790.

(Problem to be solved by the invention) However, according to the above structure, it is necessary to provide a mounting seat for mounting the filter mounting body on the outer peripheral surface of the casing and a female screw hole for fastening the bolt, which requires processing. It was troublesome. Further, bolts for attaching the filter mounting body were also required separately.

Therefore, in view of the above problems, the present invention aims to provide a simple structure that does not require any separate mounting bolts.

(Means for Solving the Problem) The technical means includes casings 4, 5, and at least a pair of gears 9, 10, 14, 15 that mesh with each other and are installed inside the casings 4, 5 from one side.
and a cover body 7 which is fastened to the casings 4, 5 by bolts 8 with the one side of the casings 4, 5 closed, and a filter mounting body 42 to which a filter body 43 is attached to the casings 4, 5. Fluid suction passages 26, 27 and discharge passages 28, 29 are formed in the outflow passage 47, and the end of the drive shaft 11, which is interlocked with the drive source, protrudes from the other side of the casing 4. The drive shaft 11 drives the gears 9,
10, 14, and 15 are driven, the filter attachment body 42 is provided on the outer surface side of the cover body 7, and a suction passage 25 communicating with an outflow passage 47 is formed in the cover body 7, The cover body 7 and the filter attachment body 42 are integrally attached to the casings 4 and 5 by the bolts 8.

(Function) According to the present invention, since the filter attachment body 42 is integrally attached to the casings 4 and 5 using the bolts 8 for attaching the cover body 7, there is no need for separate attachment bolts, and the casing 4, There is no need to separately process a female screw hole etc. in 5, resulting in a simple structure.

(Embodiment) Below, the first embodiment of the present invention will be explained based on the drawings. In Figs. 1 to 5, reference numeral 1 denotes a dual gear pump device installed inside the tractor body, which lifts and lowers the work machine. A large-capacity first pump 2 that sends hydraulic oil to a power steering hydraulic system and a small-capacity second pump 3 that sends hydraulic oil to a power steering hydraulic system are connected in series.

4 is the casing of the first pump 2, and 5 is the casing of the second pump 3, which are joined at their inner end surfaces and positioned appropriately with pins. Reference numeral 7 denotes a cover body that closes one side outer end surface of the casing 5 of the second pump 3. The casings 4, 5 and the cover body 7 are connected by bolts 8...

Reference numerals 9 and 10 denote a pair of gears that mesh with each other and are installed inside the casing 4 of the first pump 2 from the one side, one of which is the first drive gear 9, which is molded integrally with the first drive shaft 11; The other is a first driven gear 10 that is integrally formed with the first driven shaft 12 . The first drive shaft 11 and the first driven shaft 12 are rotatably supported via metals 13 . Further, from the inner end surface of the first drive shaft 11, a rectangular parallelepiped-shaped connecting portion 11a is connected.
is drilled.

Reference numerals 14 and 15 denote a pair of gears that mesh with each other and are installed inside the casing 5 of the second pump 3 from the one side, one of which is the second drive gear 14 and the second drive shaft 16.
The other is integrally formed with the second driven gear 1.
5, it is molded integrally with the second driven shaft 17. The second drive shaft 16 and the second driven shaft 17 are made of metal 13...
It is rotatably supported via... 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 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
The power receiving gear 20 is inserted into the casing 4 through an oil seal 19, and a power receiving gear 20 is fitted to the outer end protruding from the casing 4 so as to be relatively non-rotatable. 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.

Reference numeral 25 denotes a first suction passage formed in the cover body 7, which communicates linearly with the second suction passage 26 of the casing 5 and the third suction passage 27 of the casing 4. It consists of Further, the second suction passage 26 communicates with the inside of the second pump 3, and the third suction passage 27 communicates with the first pump 2.

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.

Then, each gear 9, 10, 14, 15 is driven by the rotation of the drive shafts 11, 16, and the cover body 7
Oil is sucked in from the first suction channel 25 side, and is discharged from each suction channel 26, 27 through each discharge channel 28, 29 as shown by the arrow in FIG.

Second drive shaft 16, first and second driven shafts 12, 17
A first, second, and third drain flow path passing through each axis is formed in the drain flow path.

The casing 4 of the first pump 2 is formed with a first drain reservoir 33 whose inner periphery is a part of the inner end surface of the oil seal 19, and a second drain reservoir 34 that is connected to the second drain passage of the first driven shaft 12. has been done. And the first drain reservoir 33 and the second drain reservoir 34
and is communicated with by a fourth drain passage 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 body 7. ing.

In addition, the third drain reservoir 36 and the fourth drain reservoir 3
A fifth drain passage 38 and a sixth drain passage 39 are formed in the cover body 7, which communicate the first suction passage 25 with the first suction passage 25, respectively.

Reference numeral 42 denotes a filter mounting body, which includes a mounting seat 44 on which a filter body 43 is detachably mounted.
The filter mounting body 42 also includes a mounting portion 45 that is joined to the cover body 7, and the mounting portion 45 is connected to the bolt 8.
It is fastened together with the cover body 7 by.

The filter attachment body 42 includes a fluid inflow path 46 and an outflow path 47, and the outflow path 47 and the first suction path 25 of the cover body 7 are in communication.

The filter body 43 has a case 48 and a filter element 49, and the base of the filter element 49 is communicated with the outflow passage 47 side. The oil flowing in from the inflow path 46 is then transferred to the filter element 4.
9 to the outflow path 47 side, then to the first suction path 25, and then supplied into the first pump 2 and the second pump 3.

The first embodiment of the present invention is constructed as described above, and has a structure in which the mounting portion 45 of the filter mounting body 42 is fastened together using the bolt 8 for mounting the cover body 7, and a separate mounting bolt is required. is not required, reducing costs and simplifying assembly work. Further, there is no need to separately process female screw holes or the like in the casings 4 and 5, resulting in a simple structure.

Furthermore, compared to a structure in which the filter mounting body is attached to the peripheral surface of the casings 4 and 5, it can be made elongated and can be installed in an elongated space.

Further, the first suction flow path 25, the second suction flow path 26, and the third suction flow path 27 are made straight, thereby simplifying the flow path and reducing pressure loss.

FIG. 6 shows a second embodiment, in which the cover body 7
and a filter mounting body 42 are integrally constructed.

In each of the above embodiments, a two-unit gear pump device 1 is illustrated, but a series, three or more gear pump devices may be used.

(Effects of the invention) According to the invention, there is provided a casing, at least a pair of interlocking gears installed inside the casing from one side, and a cover bolted to the casing with the one side of the casing closed. The casing has a fluid suction passage and a discharge passage that communicate with the outflow passage of the filter mounting body to which the filter body is mounted, and a drive shaft end that is interlocked and connected to the drive source. In a gear pump device in which a gear is driven by a drive shaft that protrudes from the other side of the casing, the filter attachment body is provided on the outer side of the cover body, and the suction flow communicates with the outflow passage. A channel is formed in the cover body, and the cover body and the filter mounting body are integrally attached to the casing by the bolts, and there is no need for separate bolts for mounting. No machining is required, the structure is simple, and costs can be reduced.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing the first embodiment of the present invention;
Fig. 2 is a view taken from Fig. 1 as seen from the line, Fig. 3 is an external view of the same, Fig. 4 is a view taken from Fig. 2 taken from the line shown in Fig. 5, and Fig. 5 is a sectional view taken from Fig. The figure is a side sectional view showing the second embodiment. 1... Gear pump device, 4, 5... Casing, 7... Cover body, 8... Bolt, 9, 10,
14, 15... Gear, 25... First suction channel, 2
6...Second suction flow path, 27...Third suction flow path, 2
8...First discharge flow path, 29...Second discharge flow path, 4
2...Filter mounting body, 43...Filter body, 4
7...Outflow channel.

Claims (1)

[Scope of utility model registration request] casings 4, 5; at least one pair of gears 9, 10, 14, 15 that mesh with each other and are installed inside the casings 4, 5 from one side; and the casings 4, 5.
A cover body 7 is fastened to the casings 4 and 5 by bolts 8 with the one side thereof closed, and the casings 4 and 5 are provided with a communication outlet passage 47 of a filter mounting body 42 to which a filter body 43 is attached. Suction passages 26, 27 and discharge passages 28, 29 are formed for the fluid to flow. In the gear pump device in which gears 9, 10, 14, 15 are driven by The cover body 7 and the filter mounting body 42 are connected to the casings 4 and 5 by the bolts 8.
A gear pump device characterized in that it is integrally attached to.