CN1908435A

CN1908435A - Reciprocating pump device

Info

Publication number: CN1908435A
Application number: CN 200610001997
Authority: CN
Inventors: 谏山和博
Original assignee: Maruyama Manufacturing Co Ltd
Current assignee: Maruyama Manufacturing Co Ltd
Priority date: 2005-08-01
Filing date: 2006-01-25
Publication date: 2007-02-07
Anticipated expiration: 2026-01-25
Also published as: JP4511431B2; JP2007040133A; TW200706761A; TWI296675B; CN100420854C

Abstract

The invention provides a reciprocating pump device capable of reducing bending stress acting on a crank shaft. In the reciprocating pump device (10) provided with a drive part (30) including a crank shaft driving a piston (14) of a reciprocating pump (12) and a reduction gear part (42) arranged with adjoining the drive part and including a large gear (44) attached on the crank shaft and a small gear (46) meshing with the large gear and attached to the input shaft (48) to which power is input, a first bearing (58) and a second bearing (56) rotatably supporting the input shaft are collected on a side opposite to the drive part (30) and the input shaft (48) is supported in a cantilever style. Consequently, the small gear is put close to the drive part and total length of the crank shaft is shortened to reduce bending stress.

Description

Reciprocating pump device

Technical field

The present invention relates to a kind of reciprocating pump, relate in particular to the drive portion of reciprocating pump device and the structure of reduction part.

Background technique

Known reciprocating pump device has a variety of, has put down in writing a kind of reciprocating pump device that is used for backpack power sprayer etc. in No. 2545985 communique of Japanese Utility Model invention registration.As shown in Figure 1, in order to realize miniaturization, this reciprocating pump one has, and is used to make piston reciprocating and drive portion 104 that be made of bent axle 100 and connecting rod 102 and make the dynamic retarding of engine (not shown) and send the reduction part 106 of this drive portion 104 in cylinder.

Drive portion 104 and reduction part 106 are accommodated in the enclosure, and shell is by constituting as the bottom: be used for and will support the fixing bearing shell 110 of 108a of bearing 108a, the 108b of bent axle 100; Accommodate the crankcase 114 of the core shift cam 112 of bent axle 100; Accommodate the large diameter gear 116 that is arranged on the bent axle 100 and with these gear 116 engagements and reduce the gear-box 120 that rotational speed is carried out the small gear (small-diameter gear) 118 of transmission; Another bearing 108b of bent axle 100 will be supported, fix with the 124b among the bearing 124a, the 124b that support this input shaft 122 that small gear 118 is installed, and surround, form the cylinder 126 of the coupling part that the engine output shaft is connected with input shaft 122, coupling shell 128.In addition, another bearing 124a of support input shaft 122 is fixed in the gear-box 120.

The reciprocating pump device series connection of above-mentioned prior art is provided with twin-tub, and ability to work is higher.But, in this reciprocating pump device,, therefore, it is generally acknowledged on bent axle, to produce bigger flexural stress because the distance between bearings of bent axle is longer.

Therefore, the object of the present invention is to provide a kind of reciprocating pump device that can reduce the flexural stress that produces on the bent axle.

Summary of the invention

To achieve these goals, the invention provides a kind of reciprocating pump device, it is characterized in that, this device comprises: drive portion has the bent axle of the piston that is used to drive reciprocating pump; Reduction part, with this drive portion in abutting connection with setting, have the gearwheel that is installed on the bent axle, and with gearwheel engagement and be installed in small gear on the input shaft of input power.In this reciprocating pump device, will support input shaft, and the clutch shaft bearing of its rotation and second bearing are concentrated be arranged on a side relative, with cantilever-shaped support input shaft with drive portion.

In this structure, can make small gear near drive portion one side, thereby, also can make gearwheel approaching to the core shift cam of the bent axle that utilizes connecting rod and piston to link.Therefore, can shorten the total length of bent axle, reduce the flexural stress that produces on the bent axle.

In reciprocating pump device of the present invention, be suitable for adopting following setting: clutch shaft bearing supports the load with the axis normal direction of input shaft, and supports away from the load along the small gear direction of input shaft axial direction; The load of the axis normal direction of second bearings and input shaft, and support towards the load along the small gear direction of the axial direction of input shaft; And, in the shell of reduction part, on the inner peripheral surface in the space of accommodating the clutch shaft bearing and second bearing, protuberance is set, between this protuberance and small gear, accompany clutch shaft bearing, simultaneously, at protuberance and be installed between the stopper on the input shaft and accompany second bearing.Can on shell, assemble the clutch shaft bearing and second bearing in advance, thereby improve efficiency of assembling.

As mentioned above, according to the present invention, two bearings that utilization will be supported input shaft are installed the outside in reduction part concentratedly, and with cantilever-shaped support input shaft, make small gear near drive portion one side, thus gearwheel can be configured in the core shift cam near.Thereby, can shorten the distance between the bearing that supports crankshaft two end, reduce the flexural stress that is applied on the bent axle.The burden that this has also reduced bearing is improved the reliability of reciprocating pump device.

Except the length that can shorten bent axle, the bearing by will supporting input shaft is concentrated the method for being located at a side, can save to be equivalent to gearbox parts of the prior art.Therefore, number of spare parts reduces, and it is easy that assembling operation becomes.Cumulative limit during assembling diminishes, and so not only helps to improve the precision of gearwheel and small gear, also helps to improve the durability of bearing.

Description of drawings

By based on following detailed description and claims that accompanying drawing carried out, can understand above-mentioned feature of the present invention and effect and further feature and effect.

Fig. 1 is the partial cross section figure of the reciprocating pump device of prior art.

Fig. 2 is an embodiment's of reciprocating pump device of the present invention partial cross section figure.

Fig. 3 is the partial cross section figure along the III-III line of Fig. 2.

Embodiment

Below, the preferred embodiment of reciprocating pump device of the present invention is elaborated.

Fig. 2 is the partial cross section figure of reciprocating pump device of the present invention, and Fig. 3 is the partial cross section figure of the III-III line in Fig. 2.Illustrated reciprocating pump device 10 is arranged to row at two reciprocating pumps 12 under state in opposite directions.Each reciprocating pump 12 comprises: oil hydraulic cylinder 14, pistons reciprocating 16, expulsion valve 18 and suction valve 20 in oil hydraulic cylinder 14; Wherein, by the to-and-fro motion of piston 16, liquid is 22 process streams 24 from the water sucking mouth, and the stream 26 of flowing through is discharged from discharge opening 28.Because each reciprocating pump 12 interworkings so liquid constantly is supplied to stream 26, make efficient liquid stably discharge from discharge opening 28.

The drive portion 30 that is used for driven plunger 16 is between two reciprocating pumps 12, and basic structure comprises, bent axle 32 and be installed on the core shift cam 34 of bent axle 32 and the connecting rod 36 that is connected with the piston 16 of each reciprocating pump 12.In order to reduce wear, between the core shift cam 34 of bent axle 32 and connecting rod 36, bearing 38 is set.Bent axle 32 rotations then will rotatablely move by bearing 38 and connecting rod 36 and be converted to to-and-fro motion, make piston 16 to-and-fro motion.Bent axle 32, connecting rod 36 and bearing 38 are housed in first shell 40.

In addition, from suitable external drive source, for example the engine (not shown) provides power to bent axle 32, because the rotational speed of engine output shaft is very high, therefore, will be decelerated to suitable rotating speed and pass to the reduction part 42 of bent axle 32, with drive portion 30 in abutting connection with being arranged to an integral body.Thereby, make reciprocating pump device 10 form a small-sized integral body, be applicable to backpack power sprayer etc.

Reduction part 42 comprises: be installed in gearwheel 44 on the bent axle 32, with the small gear 46 of these gearwheel 44 engagements.Small gear 46 is installed on the input shaft 48 of input engine power, in the outboard end of this input shaft 48, the part of shaft coupling (clutch) mechanism that is called cylinder (stopper) 50 is installed.Coupling body, but disconnecting ground passes to input shaft 48 with the rotary driving force of engine output shaft.Because reduction part 42 adopts this structure, therefore, when by engine rotation at a high speed being passed to input shaft 48, this rotation passes to the more gearwheel of the number of teeth 44 from the less small gear 46 of the number of teeth, and is decelerated to the rotational speed of expection.

The gearwheel 44 of reduction part 42 and small gear 46 be contained in first shell 40 and second shell 52 that combines with it between the space, in addition, input shaft 48 and cylinder 50 are housed in second shell 52.

Utilize bearing 54,56 to support two ends of bent axle 32, and can make its rotation.One of them bearing 54 is fixed in first shell 40, and another bearing 56 is fixed in second shell 52.

On the other hand, in the end of drive portion 30 1 sides of input shaft 48 bearing is not set, but small gear 46 is installed.To be used to support the clutch shaft bearing 58 of input shaft 48 and second bearing 60 and be arranged on from small gear 46 towards the part of extending with drive portion 30 opposite sides, and with cantilever-shaped support input shaft 48.

The clutch shaft bearing 58 and second bearing 60 are housed in the columnar space 62 that is formed in second shell 52.On the inner peripheral surface in this space 62, be formed with the protuberance 64 of annular, the clutch shaft bearing 58 and second bearing 60 be set in the mode of this protuberance 64 of clamping.And, utilize these two

bearings

58,60 of small gear 46 and cylinder 50 clampings, so that it can not come off from space 62.

In the present embodiment, the clutch shaft bearing 58 and second bearing 60 are ball bearing, can support the load (radial load) with input shaft 48 axis normal directions, and, be so-called radial/axial bearing along the load (axial load) of the axial direction of input shaft 48.When effect on input shaft 48 have towards with the load of drive portion 30 opposite sides, during promptly towards the axial load in the outside, for clutch shaft bearing 58, determine its direction, and be clamped between protuberance 64 and the small gear 46, so that it can support this load.On the other hand, when effect on input shaft 48 has load towards drive portion 30 1 sides, promptly when the axial load of small gear 46, second bearing 60 is provided with in opposite directions with clutch shaft bearing 58, and be clamped between protuberance 64 and the cylinder 50, so that it can support this load.By said structure, the radial load for along the axial load and the footpath direction of the both direction of its axis can stably support input shaft 48.

And in order not hinder the rotation of input shaft 48, protuberance 64 only contacts with the outer ring of the clutch shaft bearing 58 and second bearing 60, and small gear 46 only contacts with the inner ring of clutch shaft bearing 58, and cylinder 50 only contacts with the inner ring of second bearing 60.

In above-mentioned this structure,, the end of drive portion 30 1 sides of input shaft 48 is given prominence to from small gear 46 because the clutch shaft bearing 58 and second bearing 60 are concentrated a side that is arranged on input shaft 48.Therefore, can make small gear 46 near drive portion 30 1 sides.Thereby, can make the gearwheel 44 that meshes with small gear 46 near core shift cam 34, but also can shorten the total length of bent axle 32.By Fig. 2 and Fig. 1 of expression prior art structure are compared, can be readily understood that this point.The two ends of bent axle 32 are supported by bearing 54,56, still, because the distance between the bearing 54,56 also shortens, therefore, can reduce the flexural stress that radial force produced that acts on bent axle 32.Certainly, also can reduce the reaction force that acts on bearing 54,56.Therefore, this has improved the durability of bent axle 32 and bearing 54,56, and the reliability of reciprocating pump device 10, has also prolonged its working life simultaneously.

In addition, in said structure, the clutch shaft bearing 58 and second bearing, the 60 concentrated sides that are arranged on of input shaft 48 will be supported, and by small gear 46 and cylinder 50 clampings, therefore, can on second shell 52, assemble small gear 46, clutch shaft bearing 58 and second bearing 60, input shaft 48 and cylinder 50 in advance.Therefore, in the present embodiment, as shown in Figure 2, can only accommodate drive portion 30 and reduction part 42 with two shells 40,52.In the prior art, as shown in Figure 1, owing to bearing 124a, 124b are installed at the two ends of input shaft 122, therefore, must prepare to be used for fixing the shell (gear-box) 120 as the bearing 124a of drive portion 104 1 sides in addition, obviously, packaging technology is loaded down with trivial details, and produce because of parts is numerous and cause gross tolerance to become big problem, then there is not such problem in the present embodiment.Therefore, also improve the precision between gearwheel 44 and the small gear 46 easily, thereby, also help to improve the durability of gearwheel 44 and small gear 46, bearing 54,56,58,60.In addition, it also helps to improve the reliability of reciprocating pump device 10

More than, the preferred embodiments of the present invention are had been described in detail, the present invention also is not limited to the foregoing description certainly.For example, in the above-described embodiments, utilize the cylinder 50 fixedly clutch shaft bearing 58 and second bearing 60, still, also the stoppers such as ring of bearing fixing special use can be installed on input shaft 48.In addition, the present invention is for having only one or device that three above reciprocating pumps are arranged to be suitable for too.

Claims

1. a reciprocating pump device (10) is characterized in that, this reciprocating pump comprises:

Drive portion (30) has the bent axle (32) of the piston (14) that is used to drive reciprocating pump (12); Reduction part (42), with described drive portion (30) in abutting connection with being provided with, have the gearwheel (44) that is installed on the described bent axle (32), and mesh and be installed in small gear (46) on the input shaft (48) of input power with described gearwheel (44);

To support described input shaft (48), and the clutch shaft bearing (58) of its rotation and second bearing (60) are concentrated be arranged on a side relative, with the described input shaft of cantilever-shaped support (48) with described drive portion (30).

2. the described reciprocating pump device of claim 1 is characterized in that:

Described clutch shaft bearing (58) supports the load with the axis normal direction of described input shaft (48), and supports away from the load along described small gear (46) direction of described input shaft (48) axial direction;

Described second bearing (60) supports the load with the axis normal direction of described input shaft (48), and supports towards the load along described small gear (46) direction of described input shaft (48) axial direction;

The shell (52) of described reduction part (42), on the inner peripheral surface in the space (62) of accommodating described clutch shaft bearing (58) and described second bearing (60), be provided with protuberance (64), between described protuberance (64) and described small gear (46), accompany clutch shaft bearing (58), simultaneously, at described protuberance (64) and be installed between the stopper (50) on the described input shaft (48) and accompany described second bearing (60).