1. A power transmission device comprising:
an internally meshing planetary gear mechanism having an input shaft, an eccentric body provided on the input shaft, an externally toothed gear eccentrically oscillating via the eccentric body, and an internally toothed gear with which the externally toothed gear internally meshes,
wherein the externally toothed gear is assembled to the internally toothed gear in an interference fit.
2. The power transmission device according to claim 1,
wherein, when the tooth form of each of the externally toothed gear and the internally toothed gear in a state where the gears abut on each other without any clearance and without any elastic deformation at their engaging portion is defined as an abutment tooth form, the interference fit is obtained by forming part of the tooth form of the externally toothed gear or the internally toothed gear in the state of overhanging toward its mating gear relatively more than the abutment tooth form.
3. The power transmission device according to claim 1,
wherein, when the eccentricity of the externally toothed gear in a state where the externally toothed gear and the internally toothed gear abut on each other without any clearance and without any elastic deformation at their engaging portion is defined as an abutment eccentricity, the interference fit is obtained by setting the eccentricity of the externally toothed gear to a value that is larger than the abutment eccentricity.
4. A method of producing a power transmission device including an internally meshing planetary gear mechanism having an input shaft, an eccentric body provided on the input shaft, an externally toothed gear eccentrically oscillating via the eccentric body, and an internally toothed gear with which the externally toothed gear internally meshes, the method comprising the steps of:
producing the externally toothed gear with dimensions such that the externally toothed gear is not assembled to the internally toothed gear without change under the same temperature atmosphere; and
assembling the externally toothed gear to the internally toothed gear by shrinkage fit, cooling fit, or press fit.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An air conditioner for a vehicle, comprising:
a cooling heat exchanger which cools air passing therethrough; and
an air conditioning case in which the cooling heat exchanger is arranged to be slanted, the air conditioning case having an air introducing port from which air is introduced in an air introducing direction from a side of the cooling heat exchanger to a space under the cooling heat exchanger, wherein,
the air conditioning case includes a flow turning portion by which air introduced from the air introducing port into the space under the cooling heat exchanger is turned and flows through the cooling heat exchanger upwardly, and
the cooling heat exchanger is slanted to have an upper end portion and a lower end portion approximately parallel to the air introducing direction, the air conditioner further comprising
a plate member arranged in the air conditioning case at a position under the lower end portion of the cooling heat exchanger, wherein the plate member has a plate surface, which crosses with the air introducing direction to reduce a flow speed of air;
a blower for blowing air, the air conditioning case including a blower containing portion for accommodating the blower; the blower containing portion including an air blowing outlet from which air is blown out to the air introducing port, the air blowing outlet being located at a side of the air conditioning case where the plate member is arranged, under the lower end portion of the cooling heat exchanger.
2. The air conditioner according to claim 1, wherein the plate surface of the plate member is approximately perpendicular to the air introducing direction.
3. An air conditioner for a vehicle, comprising:
a cooling heat exchanger which cools air passing therethrough; and
an air conditioning case in which the cooling heat exchanger is arranged to be slanted, the air conditioning case having an air introducing port from which air is introduced in an air introducing direction from a side of the cooling heat exchanger to a space under the cooling heat exchanger, wherein,
the air conditioning case includes a flow turning portion by which air introduced from the air introducing port into the space under the cooling heat exchanger is turned and flows through the cooling heat exchanger upwardly, and
the cooling heat exchanger is slanted to have an upper end portion and a lower end portion approximately parallel to the air introducing direction, the air conditioner further comprising
a plate member arranged in the air conditioning case at a position under the lower end portion of the cooling heat exchanger, wherein the plate member has a plate surface, which crosses with the air introducing direction to reduce a flow speed of air;
a drain port portion provided in a bottom wall portion of the air conditioning case, through which condensed water generated on the cooling heat exchanger is discharged to an exterior of the air conditioning case; and
a guide portion through which the condensed water collected at the lower end portion of the cooling heat exchanger is guided to the drain port portion,
wherein the guide portion includes a protruding portion protruding from the bottom wall portion of the air conditioning case and integrated with the plate member, and a contact portion having a first end engaged with the protruding portion and a second end contacting a bottom surface of the lower end portion of the cooling heat exchanger.
4. The air conditioner according to claim 3, wherein the protruding portion extends in a direction parallel to the air introducing direction.
5. The air conditioner according to claim 1, wherein:
the plate member includes a plurality of ribs having at least an upstream rib and a downstream rib positioned downstream of the upstream rib in the air introducing direction; and
the upstream rib is arranged to have a low flow resistance as compared with the downstream rib.
6. An air conditioner for a vehicle, comprising:
a cooling heat exchanger which cools air passing therethrough; and
an air conditioning case in which the cooling heat exchanger is arranged to be slanted, the air conditioning case having an air introducing port from which air is introduced in an air introducing direction from a side of the cooling heat exchanger to a space under the cooling heat exchanger, wherein,
the air conditioning case includes a flow turning portion by which air introduced from the air introducing port into the space under the cooling heat exchanger is turned and flows through the cooling heat exchanger upwardly, and
the cooling heat exchanger is slanted to have an upper end portion and a lower end portion approximately parallel to the air introducing direction, the air conditioner further comprising
a plate member arranged in the air conditioning case at a position under the lower end portion of the cooling heat exchanger, wherein the plate member has a plate surface, which crosses with the air introducing direction to reduce a flow speed of air; wherein:
the plate member includes a plurality of ribs having at least an upstream rib and a downstream rib positioned downstream of the upstream rib in the air introducing direction;
the upstream rib is arranged to have a low flow resistance as compared with the downstream rib;
the upstream rib is slanted toward downstream in the air introducing direction; and
the downstream rib protrudes approximately perpendicular to the air introducing direction.
7. The air conditioner according to claim 1, wherein the cooling heat exchanger is arranged in the air conditioning case such that a flow speed of air flowing upward in the cooling heat exchanger is higher at the lower end portion, as compared with the upper end portion of the cooling heat exchanger.
8. The air conditioner according to claim 1, wherein the plate member is formed integrally with the bottom wall portion of the air conditioning case.
9. The air conditioner according to claim 1, wherein the cooling heat exchanger includes a plurality of tubes extending in a slanted direction of the cooling heat exchanger.
10. An air conditioner for a vehicle, comprising:
a cooling heat exchanger which cools air passing therethrough; and
an air conditioning case in which the cooling heat exchanger is arranged to be slanted, the air conditioning case having an air introducing port from which air is introduced in an air introducing direction from a side of the cooling heat exchanger to a space under the cooling heat exchanger, wherein,
the air conditioning case includes a flow turning portion by which air introduced from the air introducing port into the space under the cooling heat exchanger is turned and flows through the cooling heat exchanger upwardly, and
the cooling heat exchanger is slanted to have an upper end portion and a lower end portion approximately parallel to the air introducing direction, the air conditioner further comprising
a plate member arranged in the air conditioning case at a position under the lower end portion of the cooling heat exchanger, wherein the plate member has a plate surface, which crosses with the air introducing direction to reduce a flow speed of air;
a protruding portion protruding from a bottom wall portion of the air conditioning case toward the lower end portion of the cooling heat exchanger at a portion under the lower end portion, wherein:
the protruding portion extends in the air introducing direction; and
the plate member includes a plurality of ribs integrated with the protruding portion at intervals.
11. The air conditioner according to claim 10, wherein the ribs have a most upstream rib slanted toward downstream in the air introducing direction, and the other ribs except for the most upstream rib have surfaces approximately perpendicular to the air introducing direction.
12. The air conditioner according to claim 1, wherein the plate member extends from the air conditioning case into the space under the cooling heat exchanger, the air blown by the blower being blown directly onto the plate surface of the plate member.