JPS5830493A - Pump case of gear pump - Google Patents

Abstract

PURPOSE:To reduce the number of parts of a gear pump by constituting the suction port and the discharge port of a pump chamber, the bearing section of a drive shaft, and the frame section for fixing a drive source driving to rotate the drive shaft in one body, in a block formed with a recess for the pump chamber. CONSTITUTION:A recess 46 forming a pump chamber 51, a suction port 70 and a discharge port 72, a drive bearing section 54, and a flange section 68 and a coupling section 62 constituting a frame portion are integrated as a pump case 40 in one body. As a result, the pump case 40 can be cast or die cast in a metal material or be molded in a resin material, thereby the mass productivity can be improved. In addition, the relative precision among the recess 46, the pressure hole 43 of a coupled drive shaft 45, and the bearing section 54 and the relative position precision among the bearing section 54, the coupling section 62 of a planet gear 60, and the flange section 68 can be obtained at the general work precision by working with proper jigs.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pump case for a gear pump, and an object thereof is to reduce the number of parts of the gear pump.

Conventionally, in gear pumps, the pump case that mainly makes up the pump chamber, the discharge port, suction port, and the frame part that fixes the drive part and reduction part are constructed separately, and these parts are fixed with screws etc. and assembled. Common. ' = F. Regarding the configuration of the pump chamber, C is also composed of multiple parts, and a method is adopted in which the relative attachments between the parts are determined using positioning bins, etc., and the number of parts is large, and each part is In order to improve the positional accuracy, it is necessary to reduce the dimensional tolerance of each part, which increases the processing cost and increases the processing cost.

Therefore, in the present invention, the suction L-1 and discharge L-1 of the pump chamber, the bearing part of the drive shaft, and the drive shaft rotationally driven -< [U+ for fixing the source] are integrated into a block in which the pump chamber recess is formed. FIG. 1 and FIG.
“C” will be explained based on the diagram.

A) is the block and this pump case, and the pump case (A) has a driving gear O''4 and a driven tooth 1iI Gl.
- in the recess that accommodates fl) and the bearing part of the drive shaft Yuno (5
+) is provided at °C, and an oil seal (g) and an oil-impregnated metal bearing m are press-fitted and fixed concentrically with the bearing part (C). The pump chamber (511) is formed by the side plate pressed by the side plate (511).
By fixing the lid to the pump case with screws, liquid leakage is prevented. The zero force is a rubber-like elastic body that applies pressing force to the side plate.
The lid θ is pressed through the lid. In the pump case), there is provided an inlet C that communicates with the inlet port (7I and discharge port (3) in the recess) to the pump chamber furnace.
The flange part for fixing the commutator motor, which is the II source, with a plate, and the fitting part for positioning the planetary gear for decelerating and rotating the C drive shaft. There is a frame part voice consisting of a field.

The driven shaft ■ that supports the rotation of the driven gear (B) is press-fitted into the recess θ that forms the pump chamber button), and the center in the face width direction of the driven shaft UU + gear θ4 in this driven shaft. A first communication hole (74) that communicates with the C inlet (711) that passes from the inside of the pump case θ, and a second communication hole (74) that communicates with the pump chamber (51) side of the oil seal state and the inlet (711). Communication hole (
711 is formed and C color.

In this way, the suction port ffl and the discharge port (7) of the pump chamber (four parts forming 5υ and the pump chamber no. The functions necessary for the gear pump are integrated into one part (block).As a result, the pump case θ4
The mass productivity of C1 can be increased by using metal materials such as C casting and guicasting, or by molding it with resin materials.
C price can be kept low, and the relative positional accuracy of the concave part) and the driven shaft) and the bearing part -), and the fitting part of the bearing part f541 and the planet gear (( ) and the relative positional accuracy with the flange part using an appropriate jig C.
By machining, C can be obtained with general machining accuracy. After manufacturing the pump case by casting or molding, only the parts that require dimensional accuracy and surface roughness are machined (for example, the drive bearing part i5υ is held with a jig). By performing C lathe processing, it is possible to obtain dimensional accuracy and relative positional accuracy of each part, and it is possible to improve mass productivity and dimensional accuracy.

Furthermore, in this embodiment, the first. Since the second communicating hole 4 is provided in the post-processing process, the hydraulic fluid circulates between the driven gear and the driven shaft (to the driven gear and the driven shaft) and to the bearing, promoting lubrication. The hydraulic pressure in front of the seal state is almost the same as the hydraulic pressure in the suction [4], so the pump discharge pressure is high pressure (20k).
Sufficient durability can be obtained even when the temperature exceeds 100 g/cj.

The pump case is determined by selecting the materials of each part.
Can withstand use with various hydraulic fluids.

For example, it is made of aluminum alloy for Guicasting, and it is made into a recess)
The surface of the side plate and the bearing part are coated with self-lubricating and corrosion-resistant molybdenum disulfide or ethylene tetrafluoride, and the driven gear is made of Kanibon U, seven-fiber-containing polyacetal resin, and the driving gear (6 ) and the drive shaft are made of stainless steel with a surface nitriding treatment, so that they have durability against use at high discharge pressures in lifting platforms that use liquids with low lubricating properties such as water as working fluids.

As explained above, the pump case of the present invention can be used as a pump case for a multi-purpose gear pump, has high mass productivity, is therefore inexpensive, and is easy to obtain dimensional accuracy. We can provide excellent products, and the effects are remarkable.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a cross-sectional view of a gear pump, and FIG. 2 is a view taken along the line C--C in FIG. 1. 01...Pump case [block], (6)...Drive gear. ■...Driver gear, ni)...driven shaft, ni)...recess, side plate. υυ...Pump chamber, 藺...Drive shaft μI...Bearing part, (71...Intake port, σ; U...111: Output l'l
, 17411 increase...1st. Second communication hole agent Yoshihiro Moriki (7) HiC -56]

Claims (1)

[Scope of Claims] 1. The openings of the four parts that accommodate a pair of gears consisting of a driving gear and a driven gear are closed with side plates to form a "C pump chamber," and four parts "i'+if" are formed and a "t" knob is formed. A float pump characterized in that the suction port and the discharge port of the pump chamber, the bearing portion of the drive shaft, and the fixing plate portion of the drive source for rotationally driving the drive shaft are integrally formed in the backpack. Pump case. 2. In the concave part of the pump chamber, a driven shaft, which is the rotational support shaft of the σ1 gear, is fixed to a block and installed, and on this driven shaft,
2. A pump case for a gear pump according to claim 1, further comprising a communication port that communicates from the center portion in the tooth width direction of the driven gear through the inside of the driven shaft and to the suction side of the pump chamber. 8. The gear according to claim 1, characterized in that an oil seal is fixed at the center of the bearing part, and a communication hole is provided to communicate the pump chamber of the oil seal with the suction port side of the pump chamber. pump case.