JP2012193769A - Inscribed planetary reduction gear and gear pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress vibration generated accompanying engagement of an inner gear with an outer gear.SOLUTION: The inscribed planetary reduction gear 20 includes an inner gear 22 and an outer gear 24. In the inner gear 22 and the outer gear 24, the diameters D1 and D2 of engaged surfaces 22A and 24A and the tooth thicknesses T1 and T2 of the teeth 22C and 24C change in an axial direction. Thus, since play of the inner gear 22 and the outer gear 24 in the axial direction is suppressed, vibration generated accompanying engagement between the inner gear 22 and the outer gear 24 is suppressed. Further, since an engaged state is secured between the engaged surface 22A of the inner gear 22 and the engaged surface 24A of the outer gear 24 (engaged surfaces 22A and 24A are brought into surface contact with each other) even when the diameters D1 and D2 of engaged surfaces 22A and 24A and the tooth thicknesses T1 and T2 of the teeth 22C and 24C change in the axial direction, shocks per unit area are reduced, further suppressing the vibration.

Description

  The present invention relates to an inscribed planetary gear reducer and a gear pump.

  2. Description of the Related Art Conventionally, a trochoid gear including an outer rotor having arc teeth on an inner peripheral surface and an inner rotor having trochoidal teeth on an outer peripheral surface is known (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 4-187883

  However, in this type of inscribed planetary gear speed reducer and a gear pump including the same, it is a problem to suppress vibrations that occur due to the engagement between the inner gear and the outer gear.

  The present invention has been made in view of the above problems, and an object thereof is to provide an inscribed planetary gear reducer and a gear pump that can suppress vibrations generated by meshing between an inner gear and an outer gear. To do.

  In order to solve the above problem, an inscribed planetary gear speed reducer according to claim 1 is attached to an input shaft in an eccentric state, and is rotated eccentrically as the input shaft rotates, The inner gear and the outer gear, the diameters of the meshing surfaces of the inner gear and the outer gear being changed in the axial direction.

  According to this inscribed planetary gear speed reducer, the inner gear and the outer gear have the diameters of the meshing surfaces of each other changed in the axial direction, so that the axial play of the inner gear and the outer gear can be suppressed. As a result, it is possible to suppress vibrations that occur due to the meshing of the inner gear and the outer gear. Moreover, even if the diameters of the meshing surfaces change in the axial direction, the meshing state between the meshing surface of the inner gear and the meshing surface of the outer gear is ensured (because the meshing surfaces are in surface contact with each other). This reduces the impact and further suppresses vibration.

  The inscribed planetary gear reducer according to claim 2 is attached to an input shaft in an eccentric state, and is rotated in an eccentric manner as the input shaft rotates, and an outer gear in which the inner gear is in meshed engagement. In the inner gear and the outer gear, tooth thicknesses of teeth formed on the meshing surfaces of the inner gear and the outer gear are changed in the axial direction.

  According to this inscribed planetary gear speed reducer, the inner gear and the outer gear have the tooth thicknesses of the teeth formed on the meshing surfaces of the inner gear and the outer gear changed in the axial direction. Can be suppressed. As a result, it is possible to suppress vibrations that occur due to the meshing of the inner gear and the outer gear. Moreover, even if the tooth thickness changes in the axial direction, the meshing state between the meshing surface of the inner gear and the meshing surface of the outer gear is ensured (since the meshing surfaces are in surface contact), so the impact per unit area And vibration can be further suppressed.

  An inscribed planetary gear reducer according to claim 3 is attached to an input shaft in an eccentric state and is rotated eccentrically with rotation of the input shaft, and an outer gear in which the inner gear is in meshed engagement In the inner gear and the outer gear, the diameter of the meshing surface and the thickness of the teeth formed on the meshing surface are changed in the axial direction.

  According to this inscribed planetary gear reducer, since the inner gear and the outer gear have the diameters of the meshing surfaces and the tooth thicknesses of the teeth formed on the meshing surfaces changed in the axial direction, the axial direction of the inner gear and the outer gear Shaking can be suppressed. As a result, it is possible to suppress vibrations that occur due to the meshing of the inner gear and the outer gear. Moreover, even if the diameter of the meshing surface and the tooth thickness of the teeth change in the axial direction, the meshing state between the meshing surface of the inner gear and the meshing surface of the outer gear is ensured (because the meshing surfaces are in surface contact). The impact per unit area is reduced and vibration can be further suppressed.

  The inscribed planetary gear reducer according to claim 4 is the inscribed planetary gear reducer according to claim 1 or 3, wherein the inner gear and the outer gear have a diameter of the meshing surface at one end in the axial direction. It is the structure which changes gradually toward an other end part from a part.

  According to this inscribed planetary gear speed reducer, the inner gear and the outer gear are configured such that the diameter of the meshing surface gradually changes from one end to the other end in the axial direction, so that the meshing surface of the inner gear and the outer gear mesh with each other. The surface can be easily formed.

  The inscribed planetary gear reducer according to claim 5 is the inscribed planetary gear reducer according to claim 1 or 3, wherein the inner gear and the outer gear have a diameter of the meshing surface at one end in the axial direction. In this configuration, the distance gradually increases from the intermediate portion toward the intermediate portion and gradually decreases from the axially intermediate portion toward the other end portion.

  According to this inscribed planetary gear reducer, the inner gear and the outer gear gradually increase in diameter of the meshing surface from one axial end portion toward the intermediate portion and gradually from the axial intermediate portion toward the other end portion. Since it reduces, the shakiness to the axial direction both sides of an inner gear and an outer gear can be suppressed.

  The inscribed planetary gear reducer according to claim 6 is the inscribed planetary gear reducer according to claim 1 or 3, wherein the inner gear and the outer gear are arranged such that the diameter of the meshing surface is intermediate in the axial direction. It is the structure which is different on the border.

  According to the inscribed planetary gear reducer, the inner gear and the outer gear have a simple configuration in which the diameters of the meshing surfaces are different from each other at the intermediate portion in the axial direction, and therefore the inner gear and the outer gear can be easily manufactured.

  The inscribed planetary gear reducer according to claim 7 is the inscribed planetary gear reducer according to claim 2 or 3, wherein the inner gear has a tooth thickness formed on the meshing surface. The outer gear gradually decreases from one end in the axial direction toward the other end, and the tooth thickness of the teeth formed on the meshing surface gradually increases from one end in the axial direction toward the other end. .

  According to this inscribed planetary gear speed reducer, the inner gear has a tooth thickness formed on the meshing surface that gradually decreases from one end to the other in the axial direction, and the outer gear is formed on the meshing surface. Since the tooth thickness of the teeth gradually increases from one axial end to the other end, the inner gear meshing surface and the outer gear meshing surface can be easily formed.

  The inscribed planetary gear reducer according to claim 8 is the inscribed planetary gear reducer according to claim 2 or 3, wherein the inner gear has a tooth thickness formed on the meshing surface. The outer gear is gradually increased from one axial end portion toward the intermediate portion and gradually decreased from the axial intermediate portion toward the other end portion. It is the structure which decreases gradually toward an intermediate part from a part, and increases gradually toward an other end part from an axial direction intermediate part.

  According to this inscribed planetary gear reducer, the inner gear gradually increases the tooth thickness of the teeth formed on the meshing surface from one axial end portion to the intermediate portion and from the axial intermediate portion to the other end portion. The outer gear gradually decreases from the one axial end portion toward the intermediate portion and gradually increases from the axial intermediate portion toward the other end portion. As a result, rattling of the inner gear and the outer gear on both sides in the axial direction can be suppressed.

  The inscribed planetary gear reducer according to claim 9 is the inscribed planetary gear reducer according to claim 2 or 3, wherein the inner gear and the outer gear are teeth formed on the meshing surface. The tooth thickness is different at the axially intermediate portion.

  According to this inscribed planetary gear speed reducer, the inner gear and the outer gear have a simple configuration in which the tooth thicknesses of the teeth formed on the meshing surface are different from each other at the intermediate portion in the axial direction. It can be manufactured easily.

  Moreover, in order to solve the said subject, the gear pump of Claim 10 is a motor part which has a motor shaft as the said input shaft, The internal part as described in any one of Claims 1-9. And a pump portion in which a gap between the inner gear and the outer gear is used as a pressure chamber, and a suction port and a discharge port communicated with the pressure chamber are formed. .

  According to this gear pump, since the pump unit has the inscribed planetary gear reducer according to any one of claims 1 to 9, vibration generated with the meshing of the inner gear and the outer gear is generated. Can be suppressed.

It is a side view including a partial cross section of the gear pump according to the first embodiment of the present invention. 1 is an exploded perspective view of an inscribed planetary gear reducer according to a first embodiment of the present invention. FIG. 3 is a half perspective view showing a state in which the inscribed planetary gear reducer shown in FIG. 2 is combined. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. FIG. 5 is a sectional view taken along line 5-5 of FIG. It is a disassembled perspective view of the inscribed planetary gear reducer which concerns on 2nd embodiment of this invention. FIG. 7 is a half perspective view showing a state in which the inscribed planetary gear reducer shown in FIG. 6 is combined. FIG. 7 is an exploded perspective view of one half of the inscribed planetary gear reducer shown in FIG. 6. It is a disassembled perspective view of the inscribed planetary gear reducer according to the third embodiment of the present invention.

[First embodiment]
Hereinafter, a first embodiment of the present invention will be described.

  As shown in FIG. 1, the gear pump 10 according to the first embodiment of the present invention includes a motor unit 12 and a pump unit 14. The motor unit 12 has a motor shaft 16 as an input shaft to an inscribed planetary gear reducer 20 described later.

  The pump unit 14 has an inscribed planetary gear speed reducer 20 provided inside the housing 18. The inscribed planetary gear reducer 20 includes an inner gear 22 and an outer gear 24.

  The inner gear 22 is attached to the motor shaft 16 in an eccentric state, and is eccentrically rotated as the motor shaft 16 rotates. An inner gear 22 is in mesh with the outer gear 24. The inner gear 22 and the outer gear 24 are restricted in radial movement by a spacer 26 fitted in the housing 18, and are restricted in axial movement by a casing 28 and a cover 30.

  A gap between the inner gear 22 and the outer gear 24 is a pressure chamber 32. In addition, the cover 30 and the casing 28 are formed with a suction port 34 and a discharge port 36 that communicate with the pressure chamber 32, respectively.

  In the pump unit 14, the inner gear 22 is eccentrically rotated, and the outer gear 24 is rotated, so that the position of the pressure chamber 32 is changed, whereby the pressure from the outside via the suction port 34 is changed. A fluid is sucked into the chamber 32, and this fluid is discharged from the pressure chamber 32 to the outside through the discharge port 36.

  Here, more specifically, the inner gear 22 and the outer gear 24 constituting the above-described inscribed planetary gear speed reducer 20 are configured as follows. That is, as shown in FIGS. 2 to 5, the inner gear 22 changes so that the diameter D1 of the meshing surface 22A gradually decreases from the one end 22B1 in the axial direction toward the other end 22B2. Similarly, the outer gear 24 changes so that the diameter D2 of the meshing surface 24A gradually decreases from the one axial end 24B1 toward the other end 24B2. The rate of change in the diameters D1 and D2 is the same for the inner gear 22 and the outer gear 24. That is, the meshing surfaces 22A and 24A are formed in parallel.

  Further, in the inner gear 22, the tooth thickness (tooth thickness on the circular pitch) T1 of the teeth 22C formed on the meshing surface 22A gradually decreases from the one end 22B1 in the axial direction toward the other end 22B2. In the outer gear 24, the tooth thickness T2 of the teeth 24C formed on the meshing surface 24A is gradually increased from the one end 24B1 in the axial direction toward the other end 24B2. The rate of change of the tooth thicknesses T1 and T2 is also the same for the inner gear 22 and the outer gear 24.

  Next, the operation and effect of the first embodiment of the present invention will be described.

  According to the inscribed planetary gear speed reducer 20, the inner gear 22 and the outer gear 24 have the diameters D1 and D2 of the meshing surfaces 22A and 24A and the tooth thicknesses T1 and T2 of the teeth 22C and 24C changed in the axial direction. Therefore, the shakiness of the inner gear 22 and the outer gear 24 in the axial direction can be suppressed. As a result, it is possible to suppress vibrations that occur due to the engagement between the inner gear 22 and the outer gear 24. Moreover, even if the diameters D1 and D2 of the meshing surfaces 22A and 24A and the tooth thicknesses T1 and T2 of the teeth 22C and 24C change in the axial direction, the meshing state between the meshing surface 22A of the inner gear 22 and the meshing surface 24A of the outer gear 24 is maintained. Since it is ensured (because the meshing surfaces 22A and 24A are in surface contact), the impact per unit area is reduced, and vibration can be further suppressed.

  Further, the inner gear 22 and the outer gear 24 are configured such that the diameters D1 and D2 of the meshing surfaces 22A and 24A change so as to gradually decrease from the axial one end 22B1 and 24B1 toward the other end 22B2 and 24B2. In the inner gear 22, the tooth thickness T1 of the tooth 22C gradually decreases from the one axial end 22B1 toward the other end 22B2, and the outer gear 24 has the tooth thickness T2 of the tooth 24C from the axial one end 24B1 to the other end. It is the structure which increases gradually toward the part 24B2. Therefore, the meshing surface 22A of the inner gear 22 and the meshing surface 24A of the outer gear 24 can be easily formed.

[Second Embodiment]
Next, a second embodiment of the present invention will be described.

  In the second embodiment of the present invention, an inscribed planetary gear reducer 40 shown in FIGS. 6 to 8 is used in place of the above inscribed planetary gear reducer 20 (FIGS. 2 to 5). Yes.

  In this inscribed planetary gear speed reducer 40, the inner gear 22 is configured such that the diameter D1 of the meshing surface 22A gradually increases from the one axial end 22B1 toward the intermediate 22B3 and from the axial intermediate 22B3 to the other end 22B2. It is gradually decreasing toward. Similarly, in the outer gear 24, the diameter D2 of the meshing surface 24A gradually increases from the axial one end 24B1 toward the intermediate portion 24B3 and gradually decreases from the axial intermediate portion 24B3 toward the other end 24B2. . The rate of change in the diameters D1 and D2 is the same for the inner gear 22 and the outer gear 24. That is, the meshing surfaces 22A and 24A are formed in parallel.

  Further, in the inner gear 22, the tooth thickness T1 of the tooth 22C gradually increases from the axial one end portion 22B1 toward the intermediate portion 22B3 and gradually decreases from the axial intermediate portion 22B3 toward the other end portion 22B2. The tooth thickness T2 of the tooth 24C gradually decreases from the axial one end 24B1 toward the intermediate portion 24B3 and gradually increases from the axial intermediate portion 24B3 toward the other end 24B2. The rate of change of the tooth thicknesses T1 and T2 is also the same for the inner gear 22 and the outer gear 24.

  As shown in FIG. 8, the outer gear 24 is divided into a first member 42 and a second member 44 at an axial intermediate portion 24B3.

  Next, the operation and effect of the second embodiment of the present invention will be described.

  Also with this inscribed planetary gear reducer 40, the inner gear 22 and the outer gear 24 have the diameters D1 and D2 of the meshing surfaces 22A and 24A and the tooth thicknesses T1 and T2 of the teeth 22C and 24C changed in the axial direction. Therefore, the shakiness of the inner gear 22 and the outer gear 24 in the axial direction can be suppressed. As a result, it is possible to suppress vibrations that occur due to the engagement between the inner gear 22 and the outer gear 24. Moreover, even if the diameters D1 and D2 of the meshing surfaces 22A and 24A and the tooth thicknesses T1 and T2 of the teeth 22C and 24C change in the axial direction, the meshing state between the meshing surface 22A of the inner gear 22 and the meshing surface 24A of the outer gear 24 is maintained. Since it is ensured (because the meshing surfaces 22A and 24A are in surface contact), the impact per unit area is reduced, and vibration can be further suppressed.

  Further, the inner gear 22 and the outer gear 24 are such that the diameters D1 and D2 of the meshing surfaces 22A and 24A gradually increase from the axial one end portions 22B1 and 24B1 toward the intermediate portions 22B3 and 24B3, and from the axial intermediate portions 22B3 and 24B3 to the other. It is the structure which decreases gradually toward edge part 22B2, 24B2. In the inner gear 22, the tooth thickness T1 of the teeth 22C gradually increases from the axial one end 22B1 toward the intermediate portion 22B3 and gradually decreases from the axial intermediate portion 22B3 toward the other end 22B2. The tooth thickness T2 of the tooth 24C gradually decreases from the axial one end 24B1 toward the intermediate portion 24B3 and gradually increases from the axial intermediate portion 24B3 toward the other end 24B2. Therefore, rattling of the inner gear 22 and the outer gear 24 on both sides in the axial direction can be suppressed.

[Third embodiment]
Next, a third embodiment of the present invention will be described.

  In the third embodiment of the present invention, an inscribed planetary gear reducer 50 shown in FIG. 9 is used in place of the inscribed planetary gear reducer 20 (FIGS. 2 to 5) described above.

  In the inscribed planetary gear speed reducer 50, the inner gear 22 and the outer gear 24 have different diameters D1 and D2 of the meshing surfaces 22A and 24A with respect to the axial intermediate portions 22B3 and 24B3. That is, the diameter D1 of the meshing surface 22A of the inner gear 22 is smaller from the axial one end portion 22B1 to the intermediate portion 22B3 than from the axial intermediate portion 22B3 to the other end portion 22B2. Similarly, the diameter D2 of the meshing surface 24A in the outer gear 24 is smaller from the axial one end 24B1 to the intermediate portion 24B3 than from the axial intermediate portion 24B3 to the other end 24B2.

  The outer gear 24 is divided into a first member 42 and a second member 44 at the axial intermediate portion 24B3.

  Next, the operation and effect of the third embodiment of the present invention will be described.

  Also with this inscribed planetary gear reducer 20, the inner gear 22 and the outer gear 24 have the diameters D1 and D2 of the meshing surfaces 22A and 24A of the inner gear 22 and the outer gear 24 changed in the axial direction. Shaking can be suppressed. As a result, it is possible to suppress vibrations that occur due to the engagement between the inner gear 22 and the outer gear 24. Moreover, even if the diameters D1 and D2 of the meshing surfaces 22A and 24A change in the axial direction, the meshing state between the meshing surface 22A of the inner gear 22 and the meshing surface 24A of the outer gear 24 is secured (meshing surfaces 22A and 24A). Since they are in surface contact with each other, the impact per unit area is reduced and vibration can be further suppressed.

  Further, since the inner gear 22 and the outer gear 24 have a simple configuration in which the diameters D1 and D2 of the meshing surfaces 22A and 24A are different from each other at the intermediate portions 22B3 and 24B3 in the axial direction, the inner gear 22 and the outer gear 24 can be easily manufactured. Can do.

  In the inner gear 22 and the outer gear 24, the tooth thicknesses T1 and T2 of the teeth 22C and 24C may be uniform in the axial direction, but the tooth thicknesses T1 and T2 of the teeth 22C and 24C are different from each other at the axial intermediate portions 22B3 and 24B3. May be. Even if comprised in this way, the inner gear 22 and the outer gear 24 can be manufactured easily.

  Further, in the inner gear 22 and the outer gear 24, the diameters D1 and D2 of the meshing surfaces 22A and 24A are made uniform in the axial direction, and the tooth thicknesses T1 and T2 of the teeth 22C and 24C are bounded by the axial intermediate portions 22B3 and 24B3. May be different.

  Further, the inner gear 22 may be divided into a first member and a second member at the axial intermediate portions 22B3 and 24B3.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and other various modifications can be made without departing from the spirit of the present invention. It is.

DESCRIPTION OF SYMBOLS 10 ... Gear pump, 16 ... Motor shaft (input shaft), 20, 40, 50 ... Inscribed planetary gear reducer, 22 ... Inner gear, 24 ... Outer gear, 22A, 24A ..Meshing surface, 22C, 24C ... teeth, 26 ... spacer, 28 ... casing, 30 ... cover, 32 ... pressure chamber, 34 ... suction port, 36 ... discharge Port, 42 ... first member, 44 ... second member

Claims (10)

An inner gear attached to the input shaft in an eccentric state and rotated eccentrically with the rotation of the input shaft;
An outer gear in which the inner gear meshes internally,
With
In the inner gear and the outer gear, the diameters of the meshing surfaces of each other change in the axial direction.
Inscribed planetary gear reducer. An inner gear attached to the input shaft in an eccentric state and rotated eccentrically with the rotation of the input shaft;
An outer gear in which the inner gear meshes internally,
With
The inner gear and the outer gear have tooth thicknesses of teeth formed on the meshing surfaces of each other changed in the axial direction.
Inscribed planetary gear reducer. An inner gear attached to the input shaft in an eccentric state and rotated eccentrically with the rotation of the input shaft;
An outer gear in which the inner gear meshes internally,
With
In the inner gear and the outer gear, the diameter of each meshing surface and the thickness of teeth formed on the meshing surface are changed in the axial direction.
Inscribed planetary gear reducer. In the inner gear and the outer gear, the diameter of the meshing surface gradually changes from one axial end to the other end.
The inscribed planetary gear reducer according to claim 1 or 3. In the inner gear and the outer gear, the diameter of the meshing surface gradually increases from one axial end portion toward the intermediate portion and gradually decreases from the axial intermediate portion toward the other end portion.
The inscribed planetary gear reducer according to claim 1 or 3. The inner gear and the outer gear have different diameters of the meshing surfaces at an axially intermediate portion,
The inscribed planetary gear reducer according to claim 1 or 3. In the inner gear, the tooth thickness of the teeth formed on the meshing surface gradually decreases from one end in the axial direction toward the other end,
In the outer gear, the tooth thickness of the teeth formed on the meshing surface gradually increases from one axial end to the other end.
The inscribed planetary gear reducer according to claim 2 or 3. The inner gear, the tooth thickness of the teeth formed on the meshing surface gradually increases from one axial end portion toward the intermediate portion and gradually decreases from the axial intermediate portion toward the other end portion,
In the outer gear, the tooth thickness of the teeth formed on the meshing surface gradually decreases from one axial end portion toward the intermediate portion and gradually increases from the axial intermediate portion toward the other end portion.
The inscribed planetary gear reducer according to claim 2 or 3. The inner gear and the outer gear have different tooth thicknesses of teeth formed on the meshing surface with an axial middle portion as a boundary,
The inscribed planetary gear reducer according to claim 2 or 3. A motor unit having a motor shaft as the input shaft;
The internal planetary gear reducer according to any one of claims 1 to 9, wherein a gap between the inner gear and the outer gear serves as a pressure chamber and communicates with the pressure chamber. A pump part formed with a suction port and a discharge port;
Gear pump with