JPH048317Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a dual gear pump device that is attached to the engine of a vehicle such as a tractor and supplies hydraulic oil to various hydraulic devices.

(Prior Art) For example, in a tractor, a dual-gear hydraulic pump device is attached to the side of the engine in order to supply hydraulic fluid to a hydraulic device for lifting and lowering a working machine, a power steering device, and the like.

This hydraulic pump device is normally driven by power from a fuel injection camshaft, and includes a pump casing and a cover that have two pump chambers housing a pair of mutually meshing gears. The pump casing has a mounting part attached to the engine side on the front side, a drive shaft protrudes to the front side, and a cover is attached to the back side, and this cover closes off the back side of the pump chamber.

(Problems to be Solved by the Invention) In the prior art, the suction passage and the discharge passage communicating with the pump chamber are formed in the pump casing in the radial direction, and their outer ends, that is, the suction port and the discharge port are open to the outer peripheral surface of the pump casing, and the suction pipe and discharge pipe connected thereto project outward from the outer peripheral surface of the pump casing, that is, radially outward with respect to the drive shaft.

The discharge pipe is not much of a problem, but the suction pipe is usually located below the pump casing, and cross-overlaps with pipes or frames that run along the longitudinal direction on the side of the engine. Alternatively, it may be difficult to arrange the bonnet side plates that cover the outside of the bonnet.

(Means for solving the problem) The present invention solves the problems of the conventional technology by solving two problems.
By forming suction passages that communicate with the two pump chambers in a straight line in the two pump casings parallel to the drive shaft, and by forming the suction ports that communicate with these suction passages in the cover so as to be open toward the rear, the entire It is resolved.

That is, the specific configuration of the problem solving means of the present invention is as follows:
The mounting portion 6 and the drive shaft 23 are protruded from the front side of the first pump casing 4A having the first pump chamber 11A, and the second pump casing 4B having the second pump chamber 11B on the back surface of the first pump casing 4A and its back surface. The first,
2 Pump chambers 11 in each pump casing 4A, 4B
In the dual gear pump device in which suction passages 12A, 12B and discharge passages 13A, 13B communicating with A, 11B are formed in the radial direction of the casing, the first,
A suction passage 31 that communicates with the two suction passages 12A and 12B.
The drive shaft 2 is located on the radially outer side of each pump chamber 11A, 11B.
The first and second pump casings 4A and 4B are parallel to 3.
A suction port 18 is formed in the cover 7 and linearly communicates with the suction passage 31 and is open toward the rear.

(Function) The suction pipe 19 is connected to the suction port 18 from the back side of the pump device 1, is not located on the radially outer side of the pump casing 4, and is connected to the suction passage from the suction passage 31 that communicates linearly with the suction port 18. Oil is branched and supplied to the first and second pump chambers 11A and 11B via 12.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

In Figures 1 to 3, reference numeral 1 denotes a dual gear pump device used in tractors, which is placed on the side of the engine (not shown), and which supplies hydraulic oil to the hydraulic device 2 for lifting and lowering the work equipment. The power steering device 3 has a first pump section A and a second pump section B that supplies hydraulic oil to the power steering device 3.

The first pump part A has a mounting part 6 on the front side of the first pump casing 4A, which is attached to the back of the gear case 5 at the front of the engine, and a second pump part A on the back side.
The second pump casing 4B of the pump part B is arranged concentrically, a cover 7 is provided on the back side of the second pump casing 4B, and the first and second pump casings 4 and the cover 7 are directly connected by bolts 8. has been done.

Inside each of the first and second pump casings 4A and 4B are first and second pump chambers 11A and 11B, and suction passages 12A and 1 that communicate with each of the pump chambers 11A and 11B.
2B and discharge passages 13A and 13B are respectively formed in the casing radial direction (inside and outside direction), and the front side of each pump chamber 11A and 11B is closed by walls 14A and 14B, respectively, and the back side is open.
Each of the discharge passages 13A, 13B has discharge ports 15A, 15B open upward, and has discharge pipes 16A, 1, respectively.
6B connectors 17A, 17B are attached.

The first suction passage 12A is connected to the first pump casing 4A.
The second suction passage 12B communicates with the first suction passage 31A opened on the back side of the second pump casing 4.
The first and second suction passages 31A and 31B communicate with a second suction passage 31B opened on the back side of the
communicates with an inlet 18 formed in the cover 7.

The first and second suction passages 31A and 31B and the suction port 18 communicate linearly through a through hole in the front and back direction, and are parallel to the drive shafts 23A and 23B and radially outside of the first and second pump chambers 11A and 11B. is located close to.

The suction port 18 of the cover 7 is opened on the back side of the cover 7 and is connected to the lower part of the transmission case 20 via a suction pipe 19 that is piped approximately along the side surface of the engine, and is connected to the lower part of the transmission case 20 to supply transmission oil to the gear pump device 1. It can be sucked inward.

The first pump section A has a large capacity, and a drive shaft 23A and a driven shaft (not shown) parallel to the drive shaft 23A are rotatably supported in the pump casing 4A via a metal 24. are interlocking with each other 1
A pair of gears 25A are integrally molded. The front portion of the drive shaft 23A protrudes toward the front side of the first pump casing 4A, and is driven by power from the fuel injection camshaft via a gear transmission mechanism, etc., and has a square shaft portion at the rear end. It has 26.

The second pump section B has a small capacity, and a drive shaft 23B and a driven shaft 27B are rotatably supported in the pump casing 4B via a metal 24, and both shafts 2
3B and 27B are the drive shafts 23 of the first pump section A, respectively.
A and the driven shaft are concentric, and a square hole 28 is formed at the front end of the drive shaft 23B, which fits into the square shaft portion 26 of the drive shaft 23A and is interlocked with each other. The drive shaft 23B and the driven shaft 27B are also integrally molded with a gear 25B that meshes with each other at a midway portion thereof.

4 in the second pump casing 4B and cover 7.
Oil hole 29A for draining oil leaking from book shafts 23, 27 to first and second suction passages 31A, 31B;
29B is formed.

In addition, in the present invention, the discharge passages 13A and 13B of the first and second pump casings 4A and 4B are extended to the cover 7, and a discharge port that is open on the back side and communicates with each discharge passage of the cover 7 is formed. It's okay.

(Effects of the invention) According to the invention described in detail above, the cover 7 attached to the back side of the pump casing 4 has a suction passageway that communicates with the suction passages 31A and 31B inside the pump casing 4 and that is open toward the back side. Since the opening 18 is formed, even if it is the gear pump device 1, oil can be sucked in from the back side. Even if the gear pump device 1 is installed, for example, on the side of the engine of a tractor, the suction port 18 connected to the tube 19
This does not pose an obstacle to pipes, frames, etc. placed on the side of the engine, and the arrangement of these and the arrangement of the bonnet side plates covering them are facilitated.

In addition, since the suction passages 31A and 31B are formed in parallel to the drive shaft 23 within each pump casing 4A and 4B, it is possible to bring the suction passages 31A and 31B closer to each other on the radially outer side of each pump chamber 11A and 11B. This makes it possible to reduce the radial dimension of the gear pump device 1, and the gear pump device 1 as a whole becomes long in the front and back and compact in the radial direction, making it possible to have an optimal shape as a tractor side-mounted type.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention, in which FIG. 1 is a longitudinal sectional view, FIG. 2 is a rear view, and FIG. 3 is an overall view. DESCRIPTION OF SYMBOLS 1... Gear pump device, 4... Pump casing, 6... Mounting part, 7... Cover, 11... Pump chamber, 12... Suction path, 18... Suction port, 19...
... Suction pipe, A... First pump section, B... Second pump section, 31... Suction passage.

Claims (1)

[Claims for Utility Model Registration] A first pump casing 4A having a first pump chamber 11A has a mounting portion 6 and a drive shaft 23 protruding from the front side, and a second pump chamber 11B has a second pump chamber 11B from the back side of the first pump casing 4A. 2nd pump casing 4B
Suction passages 12A, 12B are directly connected to the cover 7 that closes the back side thereof, and communicate with the respective pump chambers 11A, 11B in the first and second pump casings 4A, 4B.
In a dual gear pump device in which discharge passages 13A and 13B are formed in the radial direction of the casing, a suction passage 31 that communicates with the first and second suction passages 12A and 12B is connected to a drive shaft 23 on the radial outside of each pump chamber 11A and 11B. A suction passage 3 is formed in the first and second pump casings 4A and 4B in parallel with the cover 7.
1. A dual gear pump device characterized by forming a suction port 18 that communicates linearly with the pump 1 and is open toward the rear.