EP1905719A1

EP1905719A1 - Elevator apparatus

Info

Publication number: EP1905719A1
Application number: EP05766225A
Authority: EP
Inventors: Yoshihiko c/o Mitsubishi Denki K.K. KOIZUMI
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2005-07-15
Filing date: 2005-07-15
Publication date: 2008-04-02
Also published as: WO2007010589A1; CN101010250A; JPWO2007010589A1; EP1905719A4

Abstract

In an elevator apparatus, a driving machine is disposed in an upper portion inside a hoistway such that a rotating shaft of a drive sheave is vertical. First and second car suspension portions are disposed on an upper portion of a car so as to be spaced apart from each other. A first car end portion of a first main rope is connected to the first car suspension portion. A second car end portion of a secondmain rope is connected to the second car suspension portion. The first and second car suspension portions are disposed at positions that are equidistant from a center of gravity of the car when viewed from above.

Description

TECHNICAL FIELD

The present invention relates to an elevator apparatus in which a driving machine is disposed in an upper portion inside a hoistway.

BACKGROUND ART

In conventional elevator apparatuses, first and second rope connecting portions are disposed on lower portions of two sides of a car. A driving machine that raises and lowers the car is disposed in an upper portion inside the hoistway. A main rope group that is wound around a drive sheave of the driving machine includes: a first main rope that is connected to the first rope connecting portion; and a second rope that is connected to the second rope connecting portion (see Patent Document 1, for example).
Patent Document 1: WO 03/074409

DISCLOSURE OF THE INVENTION

PROBLEM TO BE SOLVED BY THE INVENTION

In conventional elevator apparatuses such as that described above, because the first and second rope connecting portions are disposed on lower portions of the side surfaces of the car, it has been difficult to ensure space for performing replacement work on the main ropes, etc., inside narrow hoistways. Since the first and second rope connecting portions are disposed on a lower frame of the car, compressive load also acts on the car frame, requiring reinforcing materials such as diagonal members, etc., between the lower frame and a vertical frame of the car frame.
The present invention aims to solve the above problems and an object of the present invention is to provide an elevator apparatus that can ensure space for replacement work on main ropes, etc., simply, and that also enables construction of a car frame to be simplified.

MEANS FOR SOLVING THE PROBLEM

In order to achieve the above object, according to one aspect of the present invention, there is provided an elevator apparatus including: a driving machine that has a drive sheave, and that is disposed in an upper portion inside a hoistway such that a rotating shaft of the drive sheave is vertical; a car that has first and second car suspension portions that are disposed so as to be spaced apart from each other, and that is raised and lowered by a driving force from the driving machine; a counterweight that has a counterweight suspension portion, and that is raised and lowered by a driving force from the driving machine; a first main rope that has: a first car end portion that is connected to the first car suspension portion; and a first counterweight end portion that is connected to the counterweight suspension portion, and that is wound around the drive sheave; and a second main rope that has: a second car end portion that is connected to the second car suspension portion; and a second counterweight end portion that is connected to the counterweight suspension portion, and that is wound around the drive sheave, wherein the first and second car suspension portions are disposed on an upper portion of the car, and are disposed at positions that are equidistant from a center of gravity of the car when viewed from above.
According to another aspect of the present invention, there is provided an elevator apparatus including: a driving machine that has a drive sheave, and that is disposed in an upper portion inside a hoistway such that a rotating shaft of the drive sheave is vertical; a car that has a plurality of car suspension portions that are disposed so as to be spaced apart from each other, and that is raised and lowered by a driving force from the driving machine; a counterweight that has a counterweight suspension portion, and that is raised and lowered by a driving force from the driving machine; and a plurality of main ropes that each have: a car end portion that is connected to the car suspension portion; and a counterweight end portion that is connected to the counterweight suspension portion, and that are wound around the drive sheave, wherein the car suspension portions are disposed on an upper portion of the car, and are disposed at positions that are equidistant from a center of gravity of the car when viewed from above.
According to another aspect of the present invention, there is provided an elevator apparatus including: a driving machine that has a drive sheave, and that is disposed in an upper portion inside a hoistway such that a rotating shaft of the drive sheave is vertical; a car that has first and second car suspension portions that are disposed so as to be spaced apart from each other, and that is raised and lowered by a driving force from the driving machine; a counterweight that has a counterweight suspension portion, and that is raised and lowered by a driving force from the driving machine; a first main rope that has: a first car end portion that is connected to the first car suspension portion; and a first counterweight end portion that is connected to the counterweight suspension portion, and that is wound around the drive sheave; a second main rope that has: a second car end portion that is connected to the second car suspension portion; and a second counterweight end portion that is connected to the counterweight suspension portion, and that is wound around the drive sheave; and first and second car guide rails that are installed inside the hoistway, and that guide raising and lowering of the car, wherein the first and second car suspension portions are disposed on an upper portion of the car, and are disposed so as to be distributed on two sides of an imaginary straight line that passes through a center of gravity of the car and that is perpendicular to an imaginary straight line that connects the first and second car guide rails when viewed from above.
According to another aspect of the present invention, there is provided an elevator apparatus including: a driving machine that has a drive sheave, and that is disposed in an upper portion inside a hoistway such that a rotating shaft of the drive sheave is vertical; a car that has a plurality of car suspension portions that are disposed so as to be spaced apart from each other, and that is raised and lowered by a driving force from the driving machine; a counterweight that has a counterweight suspension portion, and that is raised and lowered by a driving force from the driving machine; and a plurality of main ropes that each have: a car end portion that is connected to the car suspension portions; and a counterweight end portion that is connected to the counterweight suspension portion, and that are wound around the drive sheave, wherein a handrail that surrounds a working area on top of the car is disposed on an upper portion of the car; and the car suspension portions are disposed outside the handrail on an upper portion of the car.
According to another aspect of the present invention, there is provided an elevator apparatus including: a driving machine that has a drive sheave, and that is disposed in an upper portion inside a hoistway such that a rotating shaft of the drive sheave is vertical; a car that has: first and second car suspension portions that are disposed so as to be spaced apart from each other; and first and second side surfaces that are opposite each other, and that is raised and lowered by a driving force from the driving machine; a counterweight that has a counterweight suspension portion, and that is raised and lowered by a driving force from the driving machine; a first main rope that has: a first car end portion that is connected to the first car suspension portion; and a first counterweight end portion that is connected to the counterweight suspension portion, and that is wound around the drive sheave; and a second main rope that has: a second car end portion that is connected to the second car suspension portion and a second counterweight end portion that is connected to the counterweight suspension portion, and that is wound around the drive sheave, wherein the first car suspension portion is disposed in a region that is within 300 mm inward from the first side surface in a width direction of the car, and the second car suspension portion is disposed in a region that is within 300 mm inward from the second side surface in a width direction of the car when viewed from above.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a plan that shows an elevator apparatus according to Embodiment 1 of the present invention;
Figure 2 is a plan that shows part of the elevator apparatus in Figure 1;
Figure 3 is a plan that shows part of the elevator apparatus in Figure 1; and
Figure 4 is an explanatory diagram that shows load sharing in the elevator apparatus in Figure 1.

BEST MODE FOR CARRYING OUT THE INVENTION

A preferred embodiment of the present invention will now be explained with reference to the drawings.

Embodiment 1

Figure 1 is a plan that shows an elevator apparatus (a machine-roomless elevator) according to Embodiment 1 of the present invention. In the figure, first and second car guide rails 2 and 3 and first and second counterweight guide rails 4 and 5 are installed inside a hoistway 1. A car 6 is guided by the car guide rails 2 and 3 so as to be raised and lowered inside the hoistway 1. A counterweight 7 is guided by the counterweight guide rails 4 and 5 so as to be raised and lowered inside the hoistway 1.
The car 6 has: a front surface 6a in which a car entrance is disposed; a rear surface 6b that is opposite the front surface 6a; and first and second side surfaces 6c and 6d that are opposite each other. The counterweight 7 is disposed beside the car 6 so as to face the second side surface 6d when positioned level with the car 6.
The first car guide rail 2 is opposite the first side surface 6c. The second car guide rail 3 is opposite the second side surface 6d. The first and second car guide rails 2 and 3 are offset from each other in a depth direction of the car 6. Specifically, the first car guide rail 2 is disposed further back than center in the depth direction of the car 6, and the second car guide rail 3 is disposed further forward than center in the depth direction of the car 6. The first and second car guide rails 2 and 3 are disposed symmetrically relative to a center of gravity C of the car 6 when viewed from above.
In addition, the first and second car guide rails 2 and 3 are disposed such that center lines in horizontal cross sections thereof are parallel to a width direction of the car 6. The counterweight 7 is disposed in a space that is further back in the depth direction of the car 6 than the second car guide rail 3. The first and second counterweight guide rails 4 and 5 are disposed such that center lines in horizontal cross sections thereof are parallel to the depth direction of the car 6.
A supporting frame 8 is supported by upper portions of the car guide rails 2 and 3 and the counterweight guide rails 4 and 5. The supporting frame 8 has: a V-shaped car return sheave beam 9; first and second rectilinear driving machine supporting beams 10a and 10b; a rectilinear counterweight return sheave beam 11; and a counterweight return sheave supporting portion 12.
The car return sheave beam 9 is fixed to upper portions of the first and second car guide rails 2 and 3 and the second counterweight guide rail 5. The car return sheave beam 9 has: a first end portion 9a that is fixed onto the second car guide rail 3; a second end portion 9b that is fixed onto the second counterweight guide rail 5; and a return portion 9c that is fixed onto the first car guide rail 2.
The driving machine supporting beams 10a and 10b are fixed to the car return sheave beam 9 so as to be parallel to the depth direction of the car 6. The counterweight return sheave beam 11 is fixed to the counterweight guide rails 4 and 5 so as to be parallel to the depth direction of the car 6. The counterweight return sheave supporting portion 12 is disposed so as to span between the first driving machine supporting beam 10b and the counterweight return sheave beam 11.
A driving machine 13 that raises and lowers the car 6 and the counterweight 7 is supported by the driving machine supporting beams 10a and 10b. The driving machine 13 has: a driving machine main body 14 that includes a motor and a brake; and a drive sheave 15 that is rotated by the driving machine main body 14. A thin hoisting machine in which an axial dimension is less than a dimension that is perpendicular to an axial direction is used for the driving machine 13.
The driving machine 13 is disposed in an upper portion inside the hoistway 1 such that a rotating shaft of the drive sheave 15 is vertical (including approximately vertical). In addition, the driving machine 13 is disposed such that the drive sheave 15 is positioned above the driving machine main body 14.
A plurality of first main ropes 16 and a plurality of second main ropes 17 are wound around the drive sheave 15. The car 6 and the counterweight 7 are suspended inside the hoistway 1 by the first and second main ropes 16 and 17 using a one-to-one (1:1) roping method.
A first car suspension portion 6e that is connected to the first main ropes 16 and a second car suspension portion 6f that is connected to the second main ropes 17 are disposed on the upper portion of the car 6. The first and second car suspension portions 6e and 6f are disposed so as to be spaced apart from each other in the width direction and the depth direction of the car 6.
The first and second car suspension portions 6e and 6f are disposed so as to be distributed on two sides of an imaginary straight line that passes through the center of gravity of the car 6 and that is perpendicular to an imaginary straight line that connects the first and second car guide rails 2 and 3 when viewed from above. In addition, a handrail 22 that surrounds a working area on top of the car 6 is disposed on an upper portion of the car 6, and the first and second car suspension portions 6e and 6f are disposed outside the handrail 22 on an upper portion of the car 6. The first car suspension portion 6e is disposed in a region that is within 300 mm inward from the first side surface 6c in a width direction of the car 6, and the second car suspension portion 6f is disposed in a region that is within 300 mm inward from the second side surface 6d in a width direction of the car 6 when viewed from above.
A counterweight suspension portion 7a that is connected to the first and second main ropes 16 and 17 is disposed on an upper portion of the counterweight 7. The counterweight suspension portion 7a is disposed on a central portion in a width direction of the counterweight 7.
The first main ropes 16 have: first car end portions 16a that are connected to the first car suspension portion 6e; and first counterweight end portions 16b that are connected to the counterweight suspension portion 7a. The second main ropes 17 have: second car end portions 17a that are connected to the second car suspension portion 6f; and second counterweight end portions 17b that are connected to the counterweight suspension portion 7a.
A first car return sheave 18 that directs the first main ropes 16 toward the first car suspension portion 6e; a second car return sheave 19 that directs the second main ropes 17 toward the second car suspension portion 6f; a counterweight return sheave 20 that directs the first and second main ropes 16 and 17 toward the counterweight suspension portion 7a; and an inverting sheave 21 that directs the first main ropes 16 from the drive sheave 15 toward the first car return sheave 18 are disposed in an upper portion inside the hoistway 1.
The first and second car return sheaves 18 and 19 are supported on the car return sheave beam 9 such that rotating shafts thereof are horizontal. The counterweight return sheave 20 is supported by the counterweight return sheave supporting portion 11 such that a rotating shaft thereof is horizontal. The inverting sheave 21 is supported by the car return sheave beam 9 such that a rotating shaft thereof is vertical or approximately vertical.
The first and second car suspension portions 6e and 6f are disposed at positions that are of equal distance (L1) from the center of gravity of the car 6 when viewed from above. The first and second car suspension portions 6e and 6f and the center of gravity of the car 6 are disposed in a straight line when viewed from above. In other words, the first and second car suspension portions 6e and 6f are disposed symmetrically relative to the center of gravity of the car 6 when viewed from above.
In addition, a distance (L2) between a center of the first car guide rail 2 and a center of the first car return sheave 18 and a distance (L2) between a center of the second car guide rail 3 and a center of the second car return sheave 19 are equal when viewed from above, as also shown in Figure 2.
A distance (L3) between the counterweight suspension portion 7a and the first counterweight guide rail 4 and a distance (L3) between the counterweight suspension portion 7a and the second counterweight guide rail 5 are equal.
As also shown in Figure 3, a distance (L4) from a center of the counterweight return sheave 20 to the counterweight suspension portion 7a is significantly smaller than a distance (L5) from a center of the counterweight return sheave 20 to the center of the first car guide rail 2 (L4 < L5) when viewed from above.
Figure 4 is an explanatory diagram that shows load sharing in the elevator apparatus in Figure 1. Because the first and second car suspension portions 6e and 6f are disposed at positions that are of equal distance (L1) from the center of gravity of the car 6 when viewed from above, downward tensions that act on the first and second main ropes 16 and 17 due to the weight Wcar of the car 6 are each Wcar/2, and axle loads that act on the first and second car return sheaves 18 and 19 are also each Wcar/2. In other words, the amounts of weight from the car 6 that act on the first and second car return sheaves 18 and 19 are equal to each other.
Because the distance (L2) between the center of the first car guide rail 2 and the center of the first car return sheave 18 and the distance (L2) between the center of the second car guide rail 3 and the center of the second car return sheave 19 are equal when viewed from above, the amounts of weight from the car 6 that act on the first and second car guide rails 2 and 3 are equal to each other.
In addition, of an axle load F that acts on the counterweight return sheave 20, a load f that acts on the first car guide rail 2 is given by f = {L4/(L4 + L5)} x F. However, since L4 is much smaller than L5, f is significantly small. Normally, if a width dimension of the car 6 is greater than or equal to 1 m and a diameter of the counterweight return sheave 20 is 0.2 m, then f will be approximately 10 percent of F. Consequently, the axle load F that acts on the counterweight return sheave 20 is mainly supported by the first and second counterweight guide rails 4 and 5. In other words, the axle load F that acts on the counterweight return sheave 20 due to the weight Wcwt of the counterweight 7 is approximately equal to Wcwt.
Since the distance (L3) between the counterweight suspension portion 7a and the first counterweight guide rail 4 and the distance (L3) between the counterweight suspension portion 7a and the second counterweight guide rail 5 are equal, the amounts of weight from the counterweight 7 that act on the counterweight guide rails 4 and 5 are also equal to each other.
In the above elevator apparatus, since the first and second car suspension portions 6e and 6f are disposed on an upper portion of the car 6, space for replacement work on the main ropes 16 and 17 can be ensured easily and construction of the car frame can be simplified.
Since the loads that act on the first and second car guide rails 2 and 3 are equal, selection conditions (strength, rigidity, etc.) can be made similar for the first and second car guide rails 2 and 3, enabling minimization of the size of the car guide rails 2 and 3. Thus, loading work and installation work for the car guide rails 2 and 3 is facilitated, enabling shortening of work time. Installation space for the car guide rails 2 and 3 is also reduced, enabling horizontal area of the hoistway 1 also to be reduced.
In addition, because the first and second car suspension portions 6e and 6f are disposed at positions that are equidistant from the center of gravity of the car 6, moments that are generated in a vicinity of the center of gravity due to deadweight from the car 6 can be suppressed, enabling reaction forces to which the car guide shoes (not shown) are subjected by the car guide rails 2 and 3 to be suppressed. Thus, running resistance and vibration are reduced, enabling riding comfort to be improved.
Because the first and second car suspension portions 6e and 6f are disposed so as to be distributed on two sides of an imaginary straight line that passes through the center of gravity of the car 6 and that is perpendicular to an imaginary straight line that connects the first and second car guide rails 2 and 3 when viewed from above, the car suspension portions 6e and 6f are disposed on two sides of the center of gravity even if the imaginary straight line that connects the car suspension portions 6e and 6f does not pass through the center of gravity of the car 6, enabling moments that are generated in the vicinity of the center of gravity due to deadweight from the car 6 to be suppressed.
Because the first and second car suspension portions 6e and 6f are disposed outside the handrail 22 on the car 6, the car suspension portions 6e and 6f will not obstruct work on the car 6, enabling a wide work area to be ensured.
In addition, because shoulder width of an adult is approximately 600 to 700 mm, by disposing the car suspension portions 6e and 6f within 600/2 mm from edge portions of the upper portion of the car 6, the deadweight of passengers will act further inside the car 6 than the car suspension portions 6e and 6f no matter where the passengers are positioned inside the car 6, enabling differences in tension between the main ropes 16 and 17 due the positions of the passengers to be reduced. Thus, differences in the amount of elongation of the main ropes 16 and 17 can also be reduced, enabling inclination of the car 6 to be reduced.
Since the load that results from the counterweight 7 is supported mainly by the first and second counterweight guide rails 4 and 5 and the loads that act on the first and second counterweight guide rails 4 and 5 are equal, the selection conditions for the first and second counterweight guide rails 4 and 5 can be made similar, enabling minimization of the size of the counterweight guide rails 4 and 5.
Moreover, even if the distances of the first and second car return sheaves 18 and 19 from the first and second car guide rails 2 and 3 differ, the loads that act on the first and second car guide rails 2 and 3 can be made uniform by supporting the weight of hoistway upper portion machinery (the driving machine 13, the supporting frame 8, and the inverting sheave 21, etc.) on the car guide rails 2 and 3 and adjusting the position of the hoistway upper portion machinery.
In the above example, the hoisting zone of the counterweight 7 was disposed beside the hoisting zone of the car 6, but the hoisting zone of a counterweight may also be disposed behind the hoisting zone of a car. In that case, the counterweight will be opposite the rear surface of the car when positioned level with the car.
In addition, there may also be three or more car suspension portions. In other words, a third car suspension portion, or fourth car suspension portion, etc., may also be disposed.

Claims

An elevator apparatus comprising:
a driving machine that has a drive sheave, and that is disposed in an upper portion inside a hoistway such that a rotating shaft of the drive sheave is vertical;

a car that has first and second car suspension portions that are disposed so as to be spaced apart from each other, and that is raised and lowered by a driving force from the driving machine;

a counterweight that has a counterweight suspension portion, and that is raised and lowered by a driving force from the driving machine;

a first main rope that has: a first car end portion that is connected to the first car suspension portion; and a first counterweight end portion that is connected to the counterweight suspension portion, and that is wound around the drive sheave; and

a second main rope that has: a second car end portion that is connected to the second car suspension portion; and a second counterweight end portion that is connected to the counterweight suspension portion, and that is wound around the drive sheave, wherein

the first and second car suspension portions are disposed on an upper portion of the car, and are disposed at positions that are equidistant from a center of gravity of the car when viewed from above.
The elevator apparatus according to Claim 1, wherein the first and second car suspension portions and the center of gravity of the car are disposed in a straight line when viewed from above.
The elevator apparatus according to Claim 1, further comprising first and second car return sheaves that are disposed in an upper portion inside the hoistway and that direct the first and second main ropes toward the first and second car suspension portions, wherein
amounts of weight from the car that act on the first and second car return sheaves are equal to each other.
The elevator apparatus according to Claim 3, further comprising first and second car guide rails that are installed inside the hoistway, and that guide raising and lowering of the car, wherein
a load from the first car return sheave is supported by the first car guide rail,
a load from the second car return sheave is supported by the second car guide rail, and
a distance between the first car return sheave and the first car guide rail and a distance between the second car return sheave and the second car guide rail are equal when viewed from above.
The elevator apparatus according to Claim 1, further comprising:
a counterweight return sheave that is disposed in an upper portion inside the hoistway, and that directs the first and second main ropes toward the counterweight suspension portion; and

first and second counterweight guide rails that are installed inside the hoistway, and that guide raising and lowering of the counterweight, wherein

a distance between the counterweight suspension portion and the first counterweight guide rail and a distance between the counterweight suspension portion and the second counterweight guide rail are equal, and

weight from the counterweight that acts on the counterweight return sheave is supported by the first and second counterweight guide rails.
An elevator apparatus comprising:
a driving machine that has a drive sheave, and that is disposed in an upper portion inside a hoistway such that a rotating shaft of the drive sheave is vertical;

a car that has a plurality of car suspension portions that are disposed so as to be spaced apart from each other, and that is raised and lowered by a driving force from the driving machine;

a counterweight that has a counterweight suspension portion, and that is raised and lowered by a driving force from the driving machine; and

a plurality of main ropes that each have: a car end portion that is connected to the car suspension portion; and a counterweight end portion that is connected to the counterweight suspension portion, and that are wound around the drive sheave, wherein

the car suspension portions are disposed on an upper portion of the car, and are disposed at positions that are equidistant from a center of gravity of the car when viewed from above.
An elevator apparatus comprising:
a driving machine that has a drive sheave, and that is disposed in an upper portion inside a hoistway such that a rotating shaft of the drive sheave is vertical;

a car that has first and second car suspension portions that are disposed so as to be spaced apart from each other, and that is raised and lowered by a driving force from the driving machine;

a counterweight that has a counterweight suspension portion, and that is raised and lowered by a driving force from the driving machine;

a first main rope that has: a first car end portion that is connected to the first car suspension portion; and a first counterweight end portion that is connected to the counterweight suspension portion, and that is wound around the drive sheave;

a second main rope that has: a second car end portion that is connected to the second car suspension portion; and a second counterweight end portion that is connected to the counterweight suspension portion, and that is wound around the drive sheave; and

first and second car guide rails that are installed inside the hoistway, and that guide raising and lowering of the car, wherein

the first and second car suspension portions are disposed on an upper portion of the car, and are disposed so as to be distributed on two sides of an imaginary straight line that that passes through a center of gravity of the car and that is perpendicular to an imaginary straight line that connects the first and second car guide rails when viewed from above.
An elevator apparatus comprising:
a driving machine that has a drive sheave, and that is disposed in an upper portion inside a hoistway such that a rotating shaft of the drive sheave is vertical;

a car that has a plurality of car suspension portions that are disposed so as to be spaced apart from each other, and that is raised and lowered by a driving force from the driving machine;

a counterweight that has a counterweight suspension portion, and that is raised and lowered by a driving force from the driving machine; and

a plurality of main ropes that each have: a car end portion that is connected to the car suspension portions; and a counterweight end portion that is connected to the counterweight suspension portion, and that are wound around the drive sheave, wherein

a handrail that surrounds a working area on top of the car is disposed on an upper portion of the car, and

the car suspension portions are disposed outside the handrail on an upper portion of the car.
An elevator apparatus comprising:
a driving machine that has a drive sheave, and that is disposed in an upper portion inside a hoistway such that a rotating shaft of the drive sheave is vertical;

a car that has: first and second car suspension portions that are disposed so as to be spaced apart from each other; and first and second side surfaces that are opposite each other, and that is raised and lowered by a driving force from the driving machine;

a counterweight that has a counterweight suspension portion, and that is raised and lowered by a driving force from the driving machine;

a first main rope that has: a first car end portion that is connected to the first car suspension portion; and a first counterweight end portion that is connected to the counterweight suspension portion, and that is wound around the drive sheave; and

a second main rope that has: a second car end portion that is connected to the second car suspension portion and a second counterweight end portion that is connected to the counterweight suspension portion, and that is wound around the drive sheave, wherein

the first car suspension portion is disposed in a region that is within 300 mm inward from the first side surface in a width direction of the car, and the second car suspension portion is disposed in a region that is within 300 mm inward from the second side surface in a width direction of the car when viewed from above.