US 2014/0271314 A1Published application

Gear Wheel with Profile Capable of Meshing with Semi-Encapsulation in a Geared Hydraulic Apparatus

AssigneesSettima Meccanica S.r.l., Mario Antonio Morselli

InventorMario Antonio Morselli

Life of this patent

Estimating the term…

Abstract

A gear wheel comprising a plurality of helical teeth, each helical tooth of the gear wheel having a tooth profile meshing with semi-encapsulation in a geared hydraulic apparatus. Each tooth having a profile which falls within a band of tolerance of +− 1/15 of the depth of a nominal tooth defined by a spline function interpolating a plurality of node points having pre-established coordinates {X,Y} with their origin on the gear wheel center.

Claims14

Dependent claims

A gear wheel comprising a plurality of helical teeth, each helical tooth of the gear wheel having a tooth profile depending on the number of the teeth of the gear wheel, said gear wheel meshing with semi-encapsulation in a geared hydraulic apparatus, wherein the tooth profile falls within a band of tolerance delimited by a top profile and a bottom profile, each of said top profile and bottom profile being at a pre-established distance from a nominal tooth profile, said nominal tooth profile corresponding to a spline function interpolating a plurality of nodal points having pre-established coordinates {X,Y} expressed in a system of Cartesian coordinates having origin (O) on the gear wheel center, said pre-established distance from the nominal tooth profile being equal to 1/15 of the depth of the nominal tooth profile obtained with the spline function, said pre-established coordinates being listed in tables 1-4 representing only the left portion of the nodal points in a symmetrical profile, for a gear wheel with a number of teeth selected from the group consisting of seven, eight, nine and ten teeth, respectively:

TABLE 1
X
Y
−5.29
10.99
−4.94
11.21
−4.71
11.37
−4.49
11.54
−4.28
11.74
−4.10
11.98
−3.94
12.24
−3.81
12.53
−3.69
12.86
−3.58
13.25
−3.52
13.62
−3.51
13.84
−3.52
14.06
−3.55
14.35
−3.56
14.61
−3.55
14.78
−3.54
14.95
−3.51
15.12
−3.44
15.46
−3.40
15.63
−3.36
15.79
−3.30
16.04
−3.21
16.38
−3.13
16.62
−3.06
16.79
−3.00
16.94
−2.93
17.09
−2.76
17.41
−2.56
17.71
−2.35
18.01
−2.09
18.28
−1.79
18.51
−1.46
18.70
−0.93
18.92
−0.75
18.98
−0.57
19.03
−0.38
19.06
−0.19
19.07
0.00
19.08
TABLE 2
X
Y
0.00
19.08
0.30
19.06
0.61
19.01
0.91
18.93
1.20
18.81
1.46
18.64
1.70
18.44
1.91
18.23
2.11
18.01
2.29
17.77
2.42
17.52
2.53
17.26
2.60
17.09
2.66
16.92
2.73
16.75
2.84
16.50
2.90
16.33
2.96
16.15
3.00
15.98
3.04
15.80
3.07
15.62
3.10
15.44
3.13
15.26
3.17
14.99
3.19
14.81
3.20
14.63
3.20
13.99
3.23
13.76
3.29
13.53
3.37
13.29
3.45
13.12
3.54
12.94
3.70
12.68
3.86
12.45
4.05
12.24
4.28
12.06
4.66
11.84
4.86
11.72
TABLE 3
X
Y
−4.47
12.27
−4.34
12.33
−4.09
12.47
−3.85
12.62
−3.64
12.79
−3.45
12.98
−3.19
13.37
−3.03
13.77
−2.98
13.96
−2.95
14.14
−2.91
14.38
−2.89
14.57
−2.89
14.76
−2.88
15.08
−2.86
15.26
−2.85
15.44
−2.83
15.62
−2.80
15.80
−2.77
15.98
−2.73
16.16
−2.68
16.34
−2.62
16.51
−2.55
16.68
−2.48
16.85
−2.41
17.02
−2.34
17.19
−2.28
17.36
−2.21
17.53
−2.13
17.70
−1.97
18.01
−1.82
18.22
−1.64
18.41
−1.44
18.58
−1.22
18.73
−1.00
18.86
−0.77
18.97
−0.52
19.05
−0.26
19.06
0.00
19.08
TABLE 4
X
Y
−4.16
12.80
−4.02
12.86
−3.89
12.92
−3.70
13.03
−3.52
13.15
−3.41
13.24
−3.25
13.38
−3.12
13.53
−3.01
13.68
−2.92
13.83
−2.84
14.03
−2.75
14.33
−2.73
14.44
−2.70
14.65
−2.69
14.75
−2.68
14.96
−2.67
15.19
−2.65
15.37
−2.61
15.63
−2.56
15.89
−2.52
16.15
−2.46
16.41
−2.39
16.66
−2.30
16.92
−2.20
17.16
−2.09
17.40
−1.97
17.64
−1.86
17.88
−1.79
18.02
−1.67
18.22
−1.54
18.41
−1.38
18.57
−1.19
18.72
−0.99
18.83
−0.78
18.93
−0.56
19.00
−0.34
19.06
−0.12
19.07
0.00
19.08

319 more elements

A geared hydraulic apparatus comprising a pair of meshing gear wheels, mounted reciprocally rotatable in a casing, the gear wheels having helical teeth, each helical tooth of the meshing gear wheels having a tooth profile depending on the number of the teeth of the respective gear wheel, said a pair of meshing gear wheels meshing with semi-encapsulation, said tooth profile, as seen on a plane perpendicular to a rotation axes of the each gear wheel, being symmetrical about a radial plane passing through the zenith of the tooth, wherein said tooth profile falls within an band of tolerance delimited by a top profile and a bottom profile, said top profile and bottom profile being equally distant of a fixed value from a nominal tooth profile lying in the center of the band of tolerance, said nominal tooth profile corresponding to a spline function interpolating a plurality of nodal points having pre-established coordinates {X,Y} expressed in a system of Cartesian coordinates having origin (O) on the respective meshing gear wheel center, said fixed value which delimits the distance from the central line being equal to 1/15 of a maximum height of the spline function, said pre-established coordinates being listed in tables 1-4 representing only the left portion of the nodal points in a symmetrical profile, for a respective gear wheel with a number of teeth selected from the group consisting of seven, eight, nine and ten teeth, respectively:

TABLE 1
X
Y
−5.29
10.99
−4.94
11.21
−4.71
11.37
−4.49
11.54
−4.28
11.74
−4.10
11.98
−3.94
12.24
−3.81
12.53
−3.69
12.86
−3.58
13.25
−3.52
13.62
−3.51
13.84
−3.52
14.06
−3.55
14.35
−3.56
14.61
−3.55
14.78
−3.54
14.95
−3.51
15.12
−3.44
15.46
−3.40
15.63
−3.36
15.79
−3.30
16.04
−3.21
16.38
−3.13
16.62
−3.06
16.79
−3.00
16.94
−2.93
17.09
−2.76
17.41
−2.56
17.71
−2.35
18.01
−2.09
18.28
−1.79
18.51
−1.46
18.70
−0.93
18.92
−0.75
18.98
−0.57
19.03
−0.38
19.06
−0.19
19.07
0.00
19.08
TABLE 2
X
Y
0.00
19.08
0.30
19.06
0.61
19.01
0.91
18.93
1.20
18.81
1.46
18.64
1.70
18.44
1.91
18.23
2.11
18.01
2.29
17.77
2.42
17.52
2.53
17.26
2.60
17.09
2.66
16.92
2.73
16.75
2.84
16.50
2.90
16.33
2.96
16.15
3.00
15.98
3.04
15.80
3.07
15.62
3.10
15.44
3.13
15.26
3.17
14.99
3.19
14.81
3.20
14.63
3.20
13.99
3.23
13.76
3.29
13.53
3.37
13.29
3.45
13.12
3.54
12.94
3.70
12.68
3.86
12.45
4.05
12.24
4.28
12.06
4.66
11.84
4.86
11.72
TABLE 3
X
Y
−4.47
12.27
−4.34
12.33
−4.09
12.47
−3.85
12.62
−3.64
12.79
−3.45
12.98
−3.19
13.37
−3.03
13.77
−2.98
13.96
−2.95
14.14
−2.91
14.38
−2.89
14.57
−2.89
14.76
−2.88
15.08
−2.86
15.26
−2.85
15.44
−2.83
15.62
−2.80
15.80
−2.77
15.98
−2.73
16.16
−2.68
16.34
−2.62
16.51
−2.55
16.68
−2.48
16.85
−2.41
17.02
−2.34
17.19
−2.28
17.36
−2.21
17.53
−2.13
17.70
−1.97
18.01
−1.82
18.22
−1.64
18.41
−1.44
18.58
−1.22
18.73
−1.00
18.86
−0.77
18.97
−0.52
19.05
−0.26
19.06
0.00
19.08
TABLE 4
X
Y
−4.16
12.80
−4.02
12.86
−3.89
12.92
−3.70
13.03
−3.52
13.15
−3.41
13.24
−3.25
13.38
−3.12
13.53
−3.01
13.68
−2.92
13.83
−2.84
14.03
−2.75
14.33
−2.73
14.44
−2.70
14.65
−2.69
14.75
−2.68
14.96
−2.67
15.19
−2.65
15.37
−2.61
15.63
−2.56
15.89
−2.52
16.15
−2.46
16.41
−2.39
16.66
−2.30
16.92
−2.20
17.16
−2.09
17.40
−1.97
17.64
−1.86
17.88
−1.79
18.02
−1.67
18.22
−1.54
18.41
−1.38
18.57
−1.19
18.72
−0.99
18.83
−0.78
18.93
−0.56
19.00
−0.34
19.06
−0.12
19.07
0.00
19.08

319 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/287,527Filed 27 May 2014
Priority: IT BO2009A00071430 Oct 2009
Published: 18 Sep 2014
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

F01C 1/084
Details specially related to intermeshing engagement type machines or engines: toothed wheels
F04C 2/084
Details specially related to intermeshing engagement type machines or pumps: toothed wheels
F04C 2/14
Of other than internal-axis type: with toothed rotary pistons
F16H 55/08
Toothed members; Worms: profiling

Family

Application12/914,780Continuation in part · filed 28 Oct 2010
Application14/287,527Continuation in part
US 2011/0103993 A1Published application
US 9,404,366 B2Related patent
US 2014/0271314 A1This patent

From the US filing history. Foreign family members aren’t listed.

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Abstract

TABLE 1
X
Y
−5.29
10.99
−4.94
11.21
−4.71
11.37
−4.49
11.54
−4.28
11.74
−4.10
11.98
−3.94
12.24
−3.81
12.53
−3.69
12.86
−3.58
13.25
−3.52
13.62
−3.51
13.84
−3.52
14.06
−3.55
14.35
−3.56
14.61
−3.55
14.78
−3.54
14.95
−3.51
15.12
−3.44
15.46
−3.40
15.63
−3.36
15.79
−3.30
16.04
−3.21
16.38
−3.13
16.62
−3.06
16.79
−3.00
16.94
−2.93
17.09
−2.76
17.41
−2.56
17.71
−2.35
18.01
−2.09
18.28
−1.79
18.51
−1.46
18.70
−0.93
18.92
−0.75
18.98
−0.57
19.03
−0.38
19.06
−0.19
19.07
0.00
19.08
TABLE 2
X
Y
0.00
19.08
0.30
19.06
0.61
19.01
0.91
18.93
1.20
18.81
1.46
18.64
1.70
18.44
1.91
18.23
2.11
18.01
2.29
17.77
2.42
17.52
2.53
17.26
2.60
17.09
2.66
16.92
2.73
16.75
2.84
16.50
2.90
16.33
2.96
16.15
3.00
15.98
3.04
15.80
3.07
15.62
3.10
15.44
3.13
15.26
3.17
14.99
3.19
14.81
3.20
14.63
3.20
13.99
3.23
13.76
3.29
13.53
3.37
13.29
3.45
13.12
3.54
12.94
3.70
12.68
3.86
12.45
4.05
12.24
4.28
12.06
4.66
11.84
4.86
11.72
TABLE 3
X
Y
−4.47
12.27
−4.34
12.33
−4.09
12.47
−3.85
12.62
−3.64
12.79
−3.45
12.98
−3.19
13.37
−3.03
13.77
−2.98
13.96
−2.95
14.14
−2.91
14.38
−2.89
14.57
−2.89
14.76
−2.88
15.08
−2.86
15.26
−2.85
15.44
−2.83
15.62
−2.80
15.80
−2.77
15.98
−2.73
16.16
−2.68
16.34
−2.62
16.51
−2.55
16.68
−2.48
16.85
−2.41
17.02
−2.34
17.19
−2.28
17.36
−2.21
17.53
−2.13
17.70
−1.97
18.01
−1.82
18.22
−1.64
18.41
−1.44
18.58
−1.22
18.73
−1.00
18.86
−0.77
18.97
−0.52
19.05
−0.26
19.06
0.00
19.08
TABLE 4
X
Y
−4.16
12.80
−4.02
12.86
−3.89
12.92
−3.70
13.03
−3.52
13.15
−3.41
13.24
−3.25
13.38
−3.12
13.53
−3.01
13.68
−2.92
13.83
−2.84
14.03
−2.75
14.33
−2.73
14.44
−2.70
14.65
−2.69
14.75
−2.68
14.96
−2.67
15.19
−2.65
15.37
−2.61
15.63
−2.56
15.89
−2.52
16.15
−2.46
16.41
−2.39
16.66
−2.30
16.92
−2.20
17.16
−2.09
17.40
−1.97
17.64
−1.86
17.88
−1.79
18.02
−1.67
18.22
−1.54
18.41
−1.38
18.57
−1.19
18.72
−0.99
18.83
−0.78
18.93
−0.56
19.00
−0.34
19.06
−0.12
19.07
0.00
19.08

319 more elements

Facts

Application

14/287,527Filed 27 May 2014

Priority

IT BO2009A00071430 Oct 2009

Published

18 Sep 2014

Term ends

Not estimatedThe source records don’t support an estimate.

Classification9 codes

F01C 1/084
Details specially related to intermeshing engagement type machines or engines: toothed wheels
F04C 2/084
Details specially related to intermeshing engagement type machines or pumps: toothed wheels
F04C 2/14
Of other than internal-axis type: with toothed rotary pistons
F16H 55/08
Toothed members; Worms: profiling