US 11,655,819 B2
Scroll compressor
Yuki Ichise, Tokyo (JP); Hiroshi Yamazaki, Tokyo (JP); Goshi Iketaka, Tokyo (JP); and Shinya Hamamoto, Tokyo (JP)
Assigned to MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD., Tokyo (JP)
Appl. No. 17/260,173
Filed by MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD., Tokyo (JP)
PCT Filed Jun. 25, 2019, PCT No. PCT/JP2019/025051
§ 371(c)(1), (2) Date Jan. 13, 2021,
PCT Pub. No. WO2020/036002, PCT Pub. Date Feb. 20, 2020.
Claims priority of application No. JP2018-152322 (JP), filed on Aug. 13, 2018.
Prior Publication US 2021/0293240 A1, Sep. 23, 2021
Int. Cl. F04C 29/00 (2006.01); F04C 18/02 (2006.01)
CPC F04C 29/0057 (2013.01) [F04C 18/0215 (2013.01); F04C 18/0253 (2013.01); F04C 2230/60 (2013.01); F04C 2240/56 (2013.01); F04C 2240/60 (2013.01); F04C 2240/807 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A scroll compressor comprising:
a fixed scroll which includes a first end plate portion and a first swirl portion formed upright in the first end plate portion;
an orbiting scroll which includes a second end plate portion having one surface facing the first end plate portion, a second swirl portion formed upright in the one surface of the second end plate portion and joining with the first swirl portion to form a compression chamber, and a boss portion formed on the other surface of the second end plate portion located opposite to the one surface and protruding from the other surface;
a shaft which rotates about a first axis and which includes a first hole portion formed on close to one end surface of the shaft facing the other surface of the second end plate portion, the first hole portion extending in the direction of the first axis;
a base seat portion which is integrally formed with the one end surface of the shaft so as to be protruded from the one end surface and which is provided with a press-fitting hole;
a drive bush which includes a drive bush body formed between the second end plate portion and the one end surface of the shaft while being accommodated in the boss portion and is in contact with the one end surface, and a penetration portion penetrating the drive bush body in a direction from the second end plate portion toward the one end surface of the shaft; and
an eccentric shaft having a constant outer diameter and extending in a direction of a second axis parallel to the first axis, the eccentric shaft being disposed in the first hole portion, the press-fitting hole through which the first hole portion is exposed, and the penetration portion;
wherein the penetration portion includes a first portion which is disposed close to the orbiting scroll and a second portion which is disposed close to the shaft, the second portion is communicated with the first portion, and a diameter of the second portion is larger than that of the first portion,
wherein the eccentric shaft is fitted into the first hole portion and the first portion and is press-inserted into the press-fitting hole, and
wherein the base seat portion is fitted onto an outer peripheral surface of the eccentric shaft and is disposed in the second portion with a gap interposed between the base seat portion and the drive bush body, and
the gap extends in the direction of the second axis from a contact surface to which the drive bush body and the one end surface are contacted to a surface formed in a radial direction of the second portion.