JP2014148959A5 - - Google Patents

Description

Here, as a hydraulic pump device mounted on a construction machine, a parallel type hydraulic pump device in which two piston pumps are arranged in parallel and configured integrally is known. The parallel hydraulic pump device includes a casing, a drive pump accommodated in the casing, a driven pump accommodated in the casing in parallel with the drive pump, and a drive pump for transmitting external power to the drive pump. and the main rotating shaft supported by the casing so as to be in series, and a driving gear for driving the supporting dynamic pump with rotating integrally with the main rotating shaft provided in the drive pump side of the main rotating shaft, a driven pump A driven rotary shaft supported by the casing in parallel with the main rotary shaft so as to be in series, and a driven gear provided on the driven pump side of the driven rotary shaft and rotating integrally with the driven rotary shaft and meshing with the drive gear A lubricating oil for lubricating the drive gear and the driven gear is stored in the casing.

The hydraulic pump device according to the present invention includes a casing, a drive pump housed in the casing, a driven pump housed in the casing in parallel with the drive pump, and the drive pump for transmitting power from the outside. supported by the casing so as to drive the pump in series with the main rotary shaft, a drive for driving the slave dynamic pump with rotating the main rotating shaft integrally provided in the drive pump side of the main rotary shaft A gear, a driven rotary shaft supported by the casing in parallel with the main rotary shaft so as to be in series with the driven pump, and provided on the driven pump side of the driven rotary shaft and integrated with the driven rotary shaft A driven gear that rotates and meshes with the drive gear, and a lubricating oil stored in the casing for lubricating the drive gear and the driven gear.

And in order to solve the above-mentioned subject, the feature of the composition adopted by the invention of claim 1 is that in the casing, at least one end face of axial end faces of the drive gear and the driven gear is provided. and the block body is provided with a gear facing surface facing to the gear facing surface of the block body, said drive gear and the driven gear is concave-shaped communicating groove corresponding to the meshes meshing portion provided, the communication Tsumizo includes a tooth tip circle of the drive gear straight interlinked groove length dimension (B) with respect to the direction of the center distance between the axis of the driven gear to the axis of the drive gear in that it has set the following distance between the tip circle and the Majiwa that intersection of the driven gear.

According to another aspect of the invention, the groove length of the communicating groove (B) is, the drive gear on the distance Hanare以 between the tooth tips of the two teeth of the driven gear sandwiching one gear of said driving gear in that the addendum circle of the driven gear and the tip circle is set to the range distance between intersection that Majiwa.

According to the invention of claim 2, of the meshing portion of the drive movement gear and the driven gear, to a low pressure side region of the end meshing from the high pressure side of the region of the start meshing, surely communicated by communicating groove It is possible to reduce the resistance when the lubricating oil flows into and into the tooth gap. Therefore, power from the outside can be efficiently transmitted to the drive pump and the driven pump, so that the reliability and stability of the hydraulic pump can be improved.

Reference numeral 19 denotes a main rotation shaft that transmits power from the outside to the drive pump 9, and the main rotation shaft 19 is connected to the drive pump 9 through a plurality of bearings 20 so as to be in series with the main rotation shaft of the rotation shaft support 3 </ b> B <b> 1. The insertion space 3B3 is rotatably supported. A base end portion of the main rotating shaft 19 protrudes from the casing body 3 and is connected to an output side of an engine (not shown). On the other hand, a driving gear 21 (described later) is attached to the tip of the main rotating shaft 19 so as to rotate integrally within the pump chamber 3B5. Thus, when the engine is driven to rotate the main rotating shaft 19, it is possible to operate the slave dynamic pump 14.

Reference numeral 21 denotes a drive gear provided on the drive pump 9 side of the main rotary shaft 19, and the drive gear 21 is cut, for example, in a direction in which the teeth of each tooth 21A are twisted obliquely with respect to the rotary shaft. It is configured as a gear. The drive gear 21 is integrally attached to the distal end side of the main rotary shaft 19 and is disposed in the pump chamber 3B5 together with the drive pump 9. The drive gear 21 is configured to rotate the main rotating shaft 19 integrally, and drives the Supporting dynamic pump 14.

Specifically, one end surface 21B side of the drive gear 21 is connected to one end side of the piston 13 so as to be capable of swinging. With this, when the main rotary shaft 19 is rotationally driven, the cylinder block 10 can be rotationally driven. At the same time, the piston 13 can be reciprocated in the cylinder 10B.

Reference numeral 24 denotes a driven gear which is provided on the driven pump 14 side of the driven rotary shaft 22 and rotates integrally with the driven rotary shaft 22, and the driven gear 24 has, for example, teeth of each tooth 24 </ b> A oblique to the rotary shaft. It is configured as a helical gear that is cut in a twisted direction. The driven gear 24 is integrally attached to the distal end side of the driven rotary shaft 22, meshed with the drive gear 21, and disposed in the pump chamber 3 </ b> B 5 together with the driven pump 14. Then, the driven gear 24, rotate integrally with the driven rotor 22.

Claims (5)

A casing, a drive pump housed in the casing, a driven pump housed in the casing in parallel with the drive pump, and the drive pump in series to transmit power from the outside to the drive pump a main rotary shaft supported in said casing, a drive gear for driving the slave dynamic pump with rotating the main rotating shaft integrally provided in the drive pump side of the main rotating shaft, the driven pump series A driven rotary shaft supported by the casing in parallel with the main rotary shaft so that the driven rotary shaft is provided on the driven pump side of the driven rotary shaft and rotates integrally with the driven rotary shaft and meshes with the drive gear. A hydraulic pump device comprising: a driven gear that includes: lubricating oil stored in the casing for lubricating the drive gear and the driven gear;
Wherein the casing, the block having a gear facing surface facing at least one end face of the end surfaces in the axial direction is provided between the driven gear and the drive gear,
Wherein said gear facing surface of the block body, said drive gear and said driven gear has concave shaped communicating groove is provided corresponding to the meshed engagement portion,
The communication Tsumizo the teeth of the addendum circle and the driven gear of the straight interlinking groove length dimension (B) with respect to the direction of the center distance between the axis of the driven gear to the axis of the driving gear the driving gear hydraulic pump apparatus characterized by the previous circle is set to less than the distance between that intersection Majiwa. The groove length of the communicating groove (B) is one wherein the addendum circle of the drive gear on the distance Hanare以 between the tooth tips of the two teeth of the driven gear driven gear sandwiching gear of the drive gear hydraulic pump unit according to claim 1, wherein the Oh Ru is set to the range distance between the tip circle and the Majiwa that intersection of.   The hydraulic pump device according to claim 1, wherein the communication groove is formed by forming both groove end portions orthogonal to the direction of the inter-axis distance as an R shape or a chamfered shape. In the casing, an inner wall that partitions the main rotating shaft and the driven rotating shaft is provided,
The block body includes a partition wall portion having the gear facing surface facing the one end surface of the drive gear and the driven gear with a slight clearance, and is orthogonal to the direction of the inter-axis distance of the partition wall portion. Formed as a U-shaped frame with a pair of legs extending from both ends to the inner wall of the casing,
By bringing the pair of leg portions of the block body into contact with the inner wall of the casing, the other end surface of the axial end surfaces of the drive gear and the driven gear is slightly smaller than the inner wall of the casing. The hydraulic pump device according to claim 1, 2 or 3, wherein the hydraulic pump device is configured to face each other with a gap. In the casing, an inner wall that partitions the main rotating shaft and the driven rotating shaft is provided,
The block body includes a first partition portion having a first gear-facing surface facing the end surface of the drive gear and the driven gear with a slight gap, and the shaft of the first partition portion. A first block body formed as a U-shaped frame body by a pair of first leg portions extending from both ends orthogonal to the distance direction toward the inner wall of the casing, and the first block A second partition wall having a second gear facing surface facing the body, the drive gear and the driven gear across the other end surface facing the other end surface of the drive gear and the driven gear; A second U-shaped frame is formed by a pair of second legs extending from both ends orthogonal to the direction of the inter-axis distance of the second partition wall portion toward the first block body. 2 block bodies,
The said block body becomes a structure attached to the inner wall of the said casing in the state which contact | abutted the 1st leg part of the said 1st block body, and the 2nd leg part of the said 2nd block body. The hydraulic pump device according to 1, 2 or 3.