FR2482206A1 - Mobile hydraulic pump unit - has integral motor reservoir and hand starter and delivery pipe - Google Patents

Abstract

The hydraulic pumping unit consists of a motor driven single cylinder pump (1) in a casing (2). The motor is supplied from a reservoir and has a manual starter. The casing has a vent and filler plug, a visual oil level gauge and a magnetic drain plug. The system is mounted on a baseplate and fits inside a tubular frame. The delivery pipe is mounted on the front of the unit. The hydraulic pump is driven through an integral reduction gear (13,14) in the casing running in anti friction bearings. The gears engage a transmission shaft (15) which has an eccentric stub shaft (23) at the other end. This is fitted in roller bearings (24) whose outer ring is in contact with the piston elements.

Description

The subject of the invention is a pump unit, which can be used particularly for any mobile hydraulic tool, and which is essentially of interest to all sites on which heavy equipment cannot be moved, in particular sites for laying electrical or telephone lines,
We already know multiple sets of tooling training. Most are heavy and bulky.

 For certain sites, for example mountain sites, these materials are totally unusable.

The object of the invention is precisely to overcome this drawback by proposing a compact motor pump group, which can be worn on the back of a man, of low weight while allowing sufficient power for the work carried out.

In accordance with the invention, this result is obtained with a motor pump group of the type comprising a motor and an apple with radial pistons, the motor shaft actuating the pump through a reduction gear and a device for moving said tones. radials, characterized in that the reduction gear and the pump, carrying the device for moving the radial pistons and the pistons, are housed compactly in a mime casing, the reduction unit consisting essentially of a gear train taken at one of its ends a transmission shaft which comprises at its other end an eccentric shaft end secured to a bearing whose outer ring is in contact with the piston elements.

The assembly allows by its very structure, since it appears externally as the combination of only two elements namely the engine and the housing, a very compact arrangement. It can be mounted on a support plate itself fixed to a tubular support frame facilitating gripping and transport q
As engine, any known tyl engine can be used, for example an air-cooled 2-stroke engine.

With a useful capacity capacity sump, for example of 0 liters, you can obtain an assembly whose total weight, including the oil and petrol of the tank (capacity, for example 0.6 liters, does not exceed 7.5 g, for a 0.3 lJn flow pump at 1625 rpm with a maximum operating pressure of 700 bar.

Such pexforxnances are particularly interesting for such a compact set
The invention will be better understood with the aid of the description below of a preferred embodiment with reference to the accompanying drawings in which
Figure 1 is a front view of a group according to the invention;
- Figure 2 is a side view of the group of Figure 1
- Figure 3 is a section of the housing longitudinally relative to the motor shaft.

Externally, the pump unit according to the invention consists, with reference to FIGS. 1 and 2, of a motor (1), for example single-cylinder, and of a casing (2) whose internal structure will be described later,
The engine is supplied from a tank (3) and is fitted with a manual start reel (4).

The casing (2) which acts as a reservoir pump preferably comprises respectively
- a breather and filling hole (5),
- a minimum visual oil level (6),
- a magnetic drain plug (7).

The motor assembly (1) - casing (2) is fixed on a support plate (8), itself fixed to a tubular support frame (9)
Finally on the housing is fixed the pressure distribution block (10). 'b
We will now describe the internal structure of the casing (2). In accordance with an essential characteristic of the invention, the casing forms an oil reservoir. This oil performs a dual function
- pump pistons supply,
- lubrication of bearings and gears,
The casing (2) is attached by screws to the motor (1) determining a passage (11) for the motor shaft (12).

The shaft (12) drives a first gear (13), preferably helicofdal, which engages a toothed ring (14) screwed on a transmission shaft (15) and centered on it. A reduction is thus achieved, the speed of rotation of the motor shaft being for example 6,500 rpm,
The shaft is supported by two bearings (16, 17).

The bearing (16) consists of a bearing mounted floating in a chamber (18) of the housing, The second bearing (17) is attached and centered in the housing on a flange (2Q), Preferably the bearing (17) will consist of a bearing (19) with two Xangées, The flange (20) is fixed on a wall (21) of the casing comprising at its upper part an opening (22),
The shaft (15) has at its other end an eccentric shaft end (23) integral with a bearing (24) whose outer ring rubs on the piston elements such as (25), In the representation of the figure 3 two of the pistons have been shown in different states,
Finally, the pistons are fixed to the support (20) by screws by means of parts (26, 27) and are interconnected by rigid brazed pressure tubes. The part (27) further comprises a connector for transmitting pressure to the distribution block (10).

 In a manner known per se, the shaft may include at its end a balancing weight (28)

Claims (3)

 - CLAIMS!; 3 1. Pump unit of the type comprising a motor and a radial piston pump, the shaft. of the motor actuating the pump through a reduction gear and a device for moving said radial pistons, characterized in that the reduction gear and the pump, comprising the device for displacing the radial pistons and the pistons, are housed compactly in the same casing (2) -, the reduction unit consisting essentially of a gear train (13, 14) engaging at one of its end-mites a transmission shaft (15) which has at its other end a eccentric shaft end (23) integral with a bearing (24) whose outer ring is in contact with the piston elements. 2. Pump unit according to claim 1, charac terized in that the pistons are interconnected by rigid brazed pressure tubes. 3. Pump unit according to any one of claims 1 and 2, characterized in that the gear (13) engages a toothed wheel (14) fixed on the shaft (15) and centered on it and that the shaft is supported on the one hand by a bearing (16) mounted floating on the housing and on the other hand by a bearing (17) attached and centered on the housing and consisting of a double row bearing (19)