JPS6388290A - Crank shaft construction of scroll compressor - Google Patents

Abstract

PURPOSE:To make a crank shaft with a great dia. without dropping the fitting easiness of bearing and to make the spindle in small size and light weight by forming the crank shaft with a dimension excessive at a part from the periphery of the spindle, and cutting off this excessive part over the width dimension of bearing. CONSTITUTION:Diameter d3 of a crank shaft 1 is formed with a dimension as excessive at a part from the periphery of the spindle 2. On the periphery of the crank shaft 1, this excessive part 3 is cut off in the extent from the coupling end B with spindle 2 to a distance which is greater than the width of the spindle 5 supporting the spindle 2, and thus a neck 4 is formed. According to this constitution, the crank shaft 1 can be given a great diameter to have an increased strength, and existence of said neck 4 ensures freedom for mounting and removal of the bearing 5, so that the dia. of the spindle 2 can be set to necessary minimum, and the construction be made in small size and light weight.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a crankshaft structure of a scroll compressor which is pivotally attached to an orbiting scroll and which orbits and moves along with a main shaft.

BACKGROUND OF THE INVENTION As shown in FIG. 5, a crankshaft IA is pivotally mounted to an orbiting scroll 7 via a bearing 8. The crankshaft IA is the main shaft (
It is eccentrically connected to the rotating shaft) 2. This amount of eccentricity corresponds to the turning radius R (FIG. 6). The main shaft 2 is pivotally supported by a casing 6 via a bearing 5. A fixed scroll 9 fixed to the casing 6 engages the orbiting scroll and acts to compress the suction medium.

Conventionally, the scroll pressure as shown in Fig. 5! In G machines, the main shaft 2 and crankshaft IA generally had structures as shown in FIGS. 6 and 7.

Problems to be Solved by the Invention As shown in FIG. 6, if the center point of the main shaft 2 is 01 and the center point of the crankshaft IA is 02, then the center points 01 and O? As mentioned above, the bearing 5 is inserted into the main shaft 2, where the distance of 1 MI represents half a turn hH, but the bearing 5 is often removed from the crankshaft IA side. Therefore, if the outer circumference of the crankshaft IA is If the bearing 5 protrudes from the outer periphery of the main shaft 2, the bearing 5 cannot be removed from the main shaft 2.

Therefore, if the outer diameter of the crankshaft IA is dl and the outer diameter of the main shaft 2 is d2, the relational expression d2≧+2H holds between them. Therefore, when the turning radius R is determined and the diameter dl is determined from the requirement of 1 strength E, the diameter d2 is inevitably determined. The bearing 5 is determined by the diameter d2 and the dimensions of the casing 6 also depend on the bearing 5. For this reason, a main shaft 2 and a bearing 5 having dimensions larger than necessary may be used, and the casing 6 also becomes large, resulting in a problem that the machine becomes large and expensive.

The present invention solves the above-mentioned problems and the like, and allows the crankshaft, main shaft, bearing, casing, etc. to be formed from necessary and sufficient dimensions and shapes under the constraints of predetermined specifications. It is an object of the present invention to provide a crankshaft structure with a scroll pressure &1i1411 that is suitable for achieving increased efficiency and cost reduction.

Means for Solving the Problems The present invention aims to provide a crankshaft that is eccentric to the main shaft, protrudes from the outer periphery of the main shaft, and has a smaller diameter than the main shaft. The outer periphery of the crankshaft is removed to a position at least equal to the width of the bearing that pivots the main shaft to the casing along It consists of

Since the working crankshaft can be formed to a dimension that protrudes from the outer periphery of the main shaft, a crankshaft with a larger diameter than before can be formed, and the main shaft,
It is possible to form a rank shaft with sufficient strength without using a large diameter bearing or the like. In addition, since the protrusion on the outer periphery of the crankshaft has been removed beyond the width dimension of the bearing that pivots the main shaft, and because the crankshaft is formed with a smaller diameter than the main shaft, the bearing cannot be removed from the crankshaft side. becomes possible.

Example An embodiment of the present invention will be described below based on the drawings.

As shown in Fig. 1, assuming that the distance between the center point OI of the main shaft 2 and the center point 02 of the crankshaft 1, that is, the turning radius R, is determined, a circle with a diameter d3 centered on the center point 02 is drawn on both sides of the crankshaft. Determine the diameter d3 of shaft 1. Diameter d3 is the seventh
Straight f in the figure: d + If the diameter is larger, the crankshaft l protrudes from the outer circumference of the main shaft 2 by the protruding portion 3,
As shown in the figure, the protruding portion 3 is removed from the outer circumference of the crankshaft 1 to a distance of 2tC from the connecting end B with the main shaft 2 along the axial direction by more than the width dimension of the bearing 5 of the main shaft 2, A neck portion 4 is formed. Figure 3 shows the neck part 4. By removing the protruding part 3, which has a cross-sectional shape in which a part of a circle is cut, the outer periphery of the neck part 4 and the outer periphery of the main shaft 2 are on the same plane. I will be coming.

As described above, by forming the crankshaft 1, the crankshaft 1 is formed to have a larger diameter than the conventional crankshaft IA even though the main shaft 2 has the same diameter. As a result, the strength of the crankshaft 1 is maintained, and the main shaft 2
．． A bearing 5 and a casing 6 are formed on the sheath 1.

FIG. 4 shows the state in which the bearing 5 is removed from the main shaft 2. Since the neck portion 4 and the main shaft 2 are on the same joint, the bearing 5 is removed from the main shaft 2.
The opening on the side of the rim section 4 becomes the delivery section. The bearing 5, which extends up to the neck portion 4, can be easily removed as shown by the two-dot chain line, since the core can be attached to the crankshaft 1, which has a smaller diameter than the main shaft 2.

In the above embodiment, the neck portion 4 was formed on the same surface as the outer periphery of the spindle 2, but the neck portion 4 does not need to protrude from the outer periphery of the spindle 2, but should be recessed from the outer periphery of the spindle 2 (i.e. below the outer circumferential surface ) may be formed, however,
The cross-sectional area of the crankshaft 1 at the neck portion 4 is required to have a size that has at least the strength to withstand the external force applied to the crankshaft 1.

As is clear from the explanation given below, according to the present invention, the crankshaft, lower shaft, bearings, etc., are required and formed from those with sufficient shapes within the constraints of specifications such as eccentric mounting. ,
Moreover, it is possible to prevent the size of the machine from becoming larger, and the effect of making it lighter weight and reducing costs is greatly increased.

[Brief explanation of the drawing]

Fig. 1 is a front view of an embodiment of the present invention, Fig. 2 is a side view of Fig. 1, Fig. 3 is a sectional view taken along the line ■-■ of Fig. 2, and Fig. 4 explains the operation of the embodiment. An explanatory side view, FIG. 5 is a partial sectional view showing the installation state of the crankshaft and the orbiting scroll, FIG. 6 is a front view showing the relationship between the conventional crankshaft and the main shaft, and FIG. 7 is a 6° FIG. 1. IA...Reference crankshaft, 2.φ.Main shaft, 3.Protrusion, 4.Neck section, 5゜8...Bearing, 6.
...Casing, 7@...Orbiting scroll, 9φ...Fixed scroll.

Claims (1)

[Claims] It has a smaller diameter than the main shaft, which is supported by a bearing in the machine casing.
In a crankshaft structure of a scroll compressor which is eccentrically connected to the orbiting scroll and pivotally connected to the orbiting scroll, the axis of the crankshaft extends from the connecting end with the main shaft within the outer periphery of the crankshaft that is formed by protruding from the outer periphery of the main shaft. A crankshaft for a scroll compressor, characterized in that the outer periphery of the crankshaft is removed at least to a position separated by a bearing width dimension of the main shaft, and the diameter of the crankshaft outside the removed portion is formed to be equal to or smaller than the outer periphery of the main shaft. Axial structure.