JP2005023834A - Multiple hydraulic gear pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multiple hydraulic gear pump enabling effective commonization of a shaft member used for a gear shaft and avoiding enlargement of a whole pump. <P>SOLUTION: When gear pairs composed of a pair of drive gears 1c, 2c, 3c and driven gears 1e, 2e, 3e meshing each other is provided in an axial direction in series and drive gear shafts 1b-2b, 2b-3b incidental to the gear pairs adjoining each other are connected rotatably as one body, an internal splines 1b1, 2b1 are formed on at least rear end parts of the drive gear shafts 1b, 2b incidental to a front stage side gear pair, an internal splines 2b1, 3b1 are formed on front end parts of the drive gear shafts 2b, 3b incidental to a rear stage side gear pair, a connecting member 5 having external splines 5a on both end parts is put between the drive gear shafts 1b-2b, 2b-3b of front and rear stage, and the external splines 5a of the connecting member 5 are engaged with the internal splines 1b1, 2b1, 3b1 of the corresponding drive gear shafts 1b, 2b, 3b to connect the drive gear shafts 1b, 2b, 3b rotatably as one body. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a multiple hydraulic gear pump widely used in various industrial machines, hydraulic devices, and the like.
[0002]
[Prior art]
In a multi-hydraulic gear pump, a pair of drive gears and driven gears that mesh with each other are connected in the axial direction, and the drive gear shafts attached to adjacent gear pairs are connected so as to be integrally rotatable. Consists of.
[0003]
FIG. 4 illustrates a dual hydraulic gear pump P. In this device, a second pump B is connected to a first pump A connected to external power so as to be integrally rotatable.
[0004]
The first pump A and the second pump B are constructed by assembling the first unit A0, the second unit B0, and the rear cover A7. The first unit A0 includes a main body A1 and a front cover A2, and a gear pair in which a drive gear A4 and a driven gear A6 are engaged is fitted into the main body A1. The second unit B0 includes a main body B1 and a front cover B7, and a gear pair in which a drive gear B4 and a driven gear B6 are engaged is fitted in the main body B1. The front cover B7 is actually formed on a part of the adapter B2, and the other part of the adapter B2 forms the rear cover A7 of the first pump A. The rear cover C is disposed alone at the rear end of the second unit. And between the rear cover C and the front cover A2 of the first unit A0, the front cover A2, the main body A1, and the rear cover are fastened with bolts (not shown) so as to sandwich the main body A1, the adapter B2, and the main body B1. The first pump A made of A7 and the second pump B made of the front cover B7, the main body B1 and the rear cover C are made operable.
[0005]
Then, between adjacent drive gear shafts A3 and B3, a male spline B31 formed at the front end portion of the second stage side drive gear shaft B3 is connected to a female spline A31 formed at the rear end portion of the first stage side drive gear shaft A3. The drive gear shafts A3 and B3 are connected to each other at the adapter internal B2 by inserting and engaging the shaft.
[0006]
Moreover, what is described in patent document 1 can be mentioned as a multiple gear pump which employ | adopted another connection structure. In this, a male spline formed by extending the rear end portion of the drive gear shaft of the first unit and a male spline formed by extending the front end portion of the drive gear shaft of the second unit are formed into a hollow cylindrical shape. None of the drive gear shafts are engaged with each other by one half of the coupling having a female spline on the inner periphery, so that the two drive gear shafts can be integrally rotated within the coupling.
[0007]
[Patent Document 1]
JP 2002-161870 A
[Problems to be solved by the invention]
For example, taking the former as an example, the driven gear shaft A5 of the first unit A0 and the drive gear shaft B3 and the driven gear shaft B5 of the second unit B0 are shaft members having the same shape from the viewpoint of the number of parts. It goes without saying that it is desirable for this type of pump to be constructed. However, as described above, since the male spline B31 for connection must be formed on the drive gear shaft B3 of the second unit B0, at least the drive gear shaft B3 has the driven gear shaft A5 of the first unit A0. In addition, a shaft member similar to the driven gear shaft B5 of the second unit B0 cannot be used. For this reason, it becomes a hindrance in aiming at the cost reduction by sharing a shaft member.
[0009]
The latter also has a similar situation in which a male spline is formed on the drive gear shaft of the first unit and the drive gear shaft of the second unit, and a shaft member common to the driven gear shaft cannot be used for these. Moreover, since the drive gear shafts are connected to each other by fitting the couplings to the drive gear shafts, a space for accommodating the coupling is required inside the adapter. There is a drawback that leads to an increase in size and cost.
[0010]
In view of such problems, the present invention provides a multiple hydraulic gear pump that can effectively share a shaft member used for a gear shaft and avoid an increase in the size of the entire pump. The purpose is to do.
[0011]
[Means for Solving the Problems]
In order to achieve this object, a multiple hydraulic pump according to the present invention includes a pair of drive gears and a pair of drive gears engaged with each other in the axial direction, and drive gears attached to adjacent gear pairs. When connecting the shafts so as to be integrally rotatable, a female spline is formed at least at the rear end of the drive gear shaft attached to the front gear pair, and a female spline is provided at the front and rear ends of the drive gear shaft attached to the rear gear pair. And by interposing a connecting member having male splines at both ends between the front and rear drive gear shafts, and engaging the male splines of the connecting members with the female splines of the corresponding drive gear shafts, The drive gear shafts are connected so as to be integrally rotatable.
[0012]
Such a configuration is particularly effective when the drive gear shafts of gear pumps having the same tooth profile are connected so as to be integrally rotatable.
[0013]
Except for the relationship between the first-stage gear pair and the second-stage gear pair, if attention is paid to the relationship between the gear pairs adjacent to the front and rear in the rear of the pair, not only the drive gear shaft on the rear stage side but also the drive gear on the front stage side. A female spline is also formed at the front and rear ends of the shaft.
[0014]
If the multiple hydraulic gear pump is configured in this way and shaft members having female splines at both ends are adopted for the driven gears of the front and rear gear pairs, all drive gears except the drive gear shaft of the first stage gear pair are used. A common shaft member can be used for the shaft and all the driven gear shafts. For this reason, it becomes possible to achieve a significant cost reduction by sharing parts. Further, since the connecting member is accommodated in the front and rear drive gear shafts, it is possible to effectively avoid the enlargement of the entire multiple hydraulic gear pump.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0016]
1 and 2 are schematic views of a multiple hydraulic gear pump X1 according to the present invention, showing a triple type. The multiple hydraulic gear pump X1 includes a first pump P1 connected to external power or an external load, and a second pump connected to the first pump P1 via a drive gear shaft 1b, 2b so as to be integrally rotatable. P2 and a third pump P3 coupled to the second pump P2 via the drive gear shafts 2b and 3b so as to be integrally rotatable. The first pump P1, the second pump P2, and the third pump P3 are, before assembly, the first unit 1 that substantially corresponds to the first pump P1, the second unit 2 that substantially corresponds to the second pump P2, and the third pump P3. It is divided into a third unit 3 and a rear cover 4 that substantially correspond to the pump P3.
[0017]
The first unit 1 includes a main body 1a and a front cover 1f. The main body 1a has a gear insertion hole 1a1, 1a1 having an inner diameter slightly larger than the outer diameter of the glasses-like drive gear 1c and driven gear 1e, and penetrates substantially horizontally. And through-hole 1a2 for attaching the said front cover 1f through a volt | bolt is formed in four places. A gear pair in which a drive gear 1c formed integrally with the drive gear shaft 1b and a driven gear 1e formed integrally with the driven gear shaft 1d are engaged with the gear fitting holes 1a1 and 1a1. The unconnected end portion of the drive gear shaft 1b is appropriately processed so that it can be connected to external power or an external load at a position penetrating the front cover 1f. The connection end of the drive gear shaft 1b has an area of about three quarters of the dimension from the connection end to the side end surface of the drive gear 1c for connection to the drive gear shaft 2b of the second unit 2. A female spline 1b1 is formed. The driven gear shaft 1d is also formed with female splines 1d1 at both ends thereof, similar to the connection end of the drive gear shaft 1b.
[0018]
The front cover 1f has a shaft hole 1f1 passing through a corresponding position of the drive gear shaft 1b, and a shaft hole 1f2 formed at a corresponding position of the driven gear shaft 1d. Then, cylindrical bushes 1f3, 1f3 are fitted into the inner circumferences of these shaft holes 1f1, 1f2, and the drive gear shaft 1b and the driven gear shaft 1d can be supported via these bushes 1f3, 1f3. The front cover 1f is provided with nut holes or female screws (not shown) at four locations corresponding to the through holes 1a2 of the main body 1a.
[0019]
Then, the front cover 1f is fitted to the unconnected side end face of the main body 1a, and the tightening bolt 1a4 is inserted into the through hole 1a2 from the main body 1a side, and the inserted tightening bolt 1a4 is formed on the front cover 1f. The main unit 1a and the front cover 1f are integrated into the first unit 1 by tightening in a hole or a female screw (not shown). In this state, the drive gear shaft 1b and the driven gear shaft 1d are supported on the inner periphery of the bushes 1f3 and 1f3.
[0020]
The second unit 2 and the third unit 3 substantially correspond to the first unit 1, and the second unit integrates the main body 2a and the adapter 2f, and the third unit 3 integrates the main body 3a and the adapter 3f. Configured.
[0021]
The main bodies 2a and 3a, like the main body 1a, have the gear insertion holes 2a1 and 3a1 each having an inner diameter slightly larger than the outer diameter of the glasses-like drive gears 2c and 3c and the driven gears 2e and 3e penetrated substantially horizontally. Is. A through hole (not shown) for attaching the adapters 2f and 3f is formed at a position corresponding to the through hole 1a2. A gear pair in which drive gears 2c and 3c formed integrally with the drive gear shafts 2b and 3b and driven gears 2e and 3e formed integrally with the driven gear shafts 2d and 3d are engaged with the gear insertion holes 2a1 and 3a1. Are inserted.
[0022]
The adapter 2f functions as a rear cover 1g and a front cover 2f1 that close the pump chamber of the first pump P1 and the pump chamber of the second pump P2, and also includes a drive gear shaft 1b and a driven gear of the first unit 1 as a part thereof. A shaft hole 2f2 for bearing the shaft 1d and the drive gear shaft 2b and the driven gear shaft 2d of the second unit 2 is opened at corresponding positions, and bushes 1f3 and 2f3 are provided in the shaft hole 2f2. The adapter 3f functions as a rear cover 2g and a front cover 3f1 that close the pump chamber of the second pump P2 and the pump chamber of the third pump P3, and a part of the adapter 3f includes a drive gear shaft 2b of the second unit 2. A shaft hole 3f2 for bearing the driven gear shaft 2d and the drive gear shaft 3b and the driven gear shaft 3d of the third unit 3 is opened at corresponding positions, and bushes 2f3 and 3f3 are provided in the shaft hole 3f2.
[0023]
The drive gear shafts 2b and 3b incidental to the drive gears 2c and 3c are formed with female splines 2b1 and 3b1 similar to those provided at the connecting end portion of the drive gear shaft 1b at both ends thereof. The driven gear shafts 2d and 3d are also formed with female splines 2d1 and 3d1 having exactly the same shape at both ends thereof.
[0024]
The connection between the main body 2a (3a) and the adapter 2f (3f) is performed according to the connection between the main body 1a and the front cover 1f.
[0025]
The rear cover 4 has an insertion hole 4a at a position corresponding to the drive gear shaft 3b and the driven gear shaft 3d attached to the third unit 3, and the insertion hole 4a has a longitudinal dimension of the drive gear shaft 3b and the driven gear shaft 3d. It has a slightly deeper depth. Cylindrical bushes 3f3 and 3f3 are fitted in the inner periphery of the insertion hole 4a so that the drive gear shaft 3b and the driven gear shaft 3d can be rotatably supported via the bushes 3f3 and 3f3. Yes.
[0026]
In the assembly process, between the front and rear drive gear shafts 1b-2b and 2b-3b, the connecting members 5 having male splines 5a, 5a are interposed at both ends, and the male splines 5a of the connecting members 5 are interposed. 5a is engaged with the female splines 1b1 and 2b1 of the corresponding drive gear shafts 1b and 2b, and the female splines 2b1 and 3b1 of the drive gear shafts 2b and 3b, so that the drive gear shafts 1b and 2b, the drive gear shaft 2b, 3b is connected so that integral rotation is possible.
[0027]
The male spline 5a is set to have a slightly shorter length than the female splines 1b1, 2b1, 3b1. The connecting portion 5b located in the middle of the male splines 5a and 5a at both ends has the same outer diameter as the male spline 5a and has a length dimension of about a quarter of the male spline 5a.
[0028]
The following is a procedure for assembling the multiple liquid gear pump X1. First, the male spline 5a located at the front end of the connecting member 5 is engaged with the female spline 1b1 of the first unit 1, and the female spline 2b1 of the second unit 2 is engaged with the male spline 5a located at the rear end of the connecting member 5. Engage. As a result, the second unit 2 is connected in the axial direction of the drive gear shaft 1b of the adjacent first unit 1. Further, similarly to the above, the male spline 5a located at the front end of the connecting member 5 is engaged with the female splice 2b1 of the second unit 2, and the male spline 5a located at the rear end of the connecting member 5 is engaged with the male spline 5a. The female spline 3b1 is engaged. Thereby, the third unit 3 is connected to the adjacent second unit 2. Further, a rear cover 4 is fitted into the third unit 3, and a connecting bolt (from the outside of the rear cover 4) is connected to a connecting through hole 1 a formed by communicating with the first unit 1, the second unit 2, and the third unit 3. (Not shown) is inserted and fastened with a nut hole or female screw (not shown) formed in the front cover 1f, so that the pumps P1, P2, and P3 are continuously formed in the axial direction of the drive gear. The assembly of the continuous hydraulic gear pump X1 is completed.
[0029]
As described above, the multiple fluid pressure gear pump X1 of the present embodiment has a plurality of gear pairs in which the drive gears 1c, 2c, 3c and the driven gears 1e, 2e, 3e mesh with each other in the axial direction. Adjacent drive gear shafts 1b, 2b, 3b are rotated together. As a connecting structure, female splines 1b1, 2b1, 3b1 are formed on drive gear shafts 1b, 2b, 3b attached to adjacent gear pairs, and male splines are formed at both ends between these female splines 1b1, 2b1, 3b1. By interposing a connecting member 5 having a spline 5a and engaging the male spline 5a of the connecting member 5 with the corresponding female splines 1b1, 2b1, 3b1, the drive gear shafts 1b, 2b, 3b can be sequentially rotated integrally. It is linked to. Also, the driven gear shafts 1d, 2d, and 3d of the pumps 1, 2, and 3 are formed with exactly the same female splines 1d1, 2d1, and 3d1.
[0030]
Therefore, a common shaft member can be used for all the drive gear shafts 2b and 3b and all the driven gear shafts 1d, 2d, and 3d except for the drive gear shaft 1b attached to the gear pair of the first pump P1. Thus, it is possible to effectively reduce the cost by sharing parts compared to the conventional case. Further, since the connecting member 5 is only housed inside each drive gear shaft 1b, 2b, 3b, it is possible to prevent the connecting portion from increasing in diameter and effectively increase the size of the multiple hydraulic gear pump as a whole. It can also be avoided.
[0031]
The specific configuration of each unit is not limited to the above-described embodiment. In the following description, the same reference numerals as those in the above embodiment are used unless otherwise specified.
[0032]
FIG. 3 shows a multiple hydraulic gear pump X10 according to another embodiment of the present invention. This pump X10 has the same drive gear 1c as in the above-described embodiment, and has the same shape as the driven gear shaft 10e, the first unit 10 formed by penetrating the female spline 10d1 in the center of the hollow driven gear shaft 10e. The second unit 20 and the third unit 30 include drive gear shafts 20b and 30b and driven gear shafts 20d and 30d. Then, with the first unit 10, the second unit 20, and the third unit 30 that are integrally formed adjacent to each other, the drive gear shafts 20b and 30b communicate with each other and are engaged with the female splines 1b1, 2b1, and 3b1. The drive gear shafts 1c, 20b, and 30b are connected by a connecting member 50 having a male spline 50a of a matching length, and fastened by the front cover 1f and the rear cover 4 of the first unit 10. The units 10, 20, and 30 connected in this way constitute the first pump P10 by the front cover 1f, the first unit 10 and the rear cover 1g of the adapter 2f, and the front cover 2f1, the second unit 20 and the adapter 2f. The rear pump 2g of the adapter 3f constitutes the second pump P20, and the front cover 3f1, the third unit 30 and the rear cover 4 of the adapter 3f constitute the third pump P30.
[0033]
The multiple hydraulic gear pump X10 is assembled such that the drive gear shaft 1b and the driven gear shaft 10c on the connecting side of the first unit 10 configured integrally are rotatably supported by the adapter 2f of the second unit 20. insert. Further, the drive gear shaft 20b and the driven gear shaft 20e on the connection side of the second unit 20 are similarly inserted into the adapter 3f of the third unit 30. And the said connection member 50 is inserted from the main body 3a side of the 3rd unit 30, and it meshes | engages and engages with female spline 20b1, 30b1, and 1b1. Finally, as in the above-described embodiment, the assembly work is completed by fastening the front cover 1f and the rear cover 4 of the first pump 10 together.
[0034]
Also in such a multiple hydraulic gear pump X10, the coupling member 50 meshes within the drive gear shafts 1b, 20b, 30b to connect the units 10, 20, 30 to each other. The entire multi-hydraulic hydraulic gear pump X10 can be made compact compared to the connected one. In addition, since the drive gear shafts 20b and 30b and the driven gear shafts 10e, 20e, and 30e are configured in the same shape, it is possible to share parts, leading to a significant cost reduction.
[0035]
In this embodiment, a triple-type multi-hydraulic hydraulic gear pump is configured. However, the number of continuous pumps is not limited to these, and the number of pumps may be increased or decreased according to the required application. Is possible. Even in this case, it is possible to easily perform the operation by forming each unit composed of common parts and attaching and detaching these units.
[0036]
In addition, the specific configuration of each part is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
[0037]
【The invention's effect】
Since the present invention has the above-described configuration, it is possible to effectively use a shaft member used for a gear shaft, and to provide a multiple hydraulic gear pump that can avoid an increase in the size of the entire pump. It becomes possible.
[Brief description of the drawings]
FIG. 1 is a schematic longitudinal sectional view of a multiple hydraulic gear pump according to an embodiment of the present invention.
2 is an AA arrow view in FIG. 1. FIG.
FIG. 3 is a schematic view of a multiple gear hydraulic pump according to a modification of the present invention.
FIG. 4 is a schematic view of a conventional multiple hydraulic gear pump.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1, 10 ... 1st pump 1b, 2b, 20b, 3b, 30b ... Drive gear shaft 1b1, 2b1, 20b1, 3b1, 30b1 ... Female spline 1c, 2c, 3c ... Drive gear 1d, 10d, 2d, 20d, 3d, 30d ... driven gear shaft 1e, 10e, 2e, 20e, 3e30e ... driven gear 2, 20 ... second pump 5, 50 ... connecting member 5a, 50a ... male spline

Claims (1)

A gear pair consisting of a pair of drive gears and driven gears meshing with each other is connected in the axial direction, and drive gear shafts attached to adjacent gear pairs are connected so as to be integrally rotatable,
A female spline is formed at least at the rear end of the drive gear shaft attached to the front gear pair, and a female spline is formed at the front and rear ends of the drive gear shaft attached to the rear gear pair. The drive gear shafts are connected so that they can rotate together by interposing a connecting member having male splines at both ends between the shafts and engaging the male splines of the connecting members with the female splines of the corresponding drive gear shafts. A multi-hydraulic gear pump characterized by comprising

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