JPH0324805Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a bearing structure for a rotary piston engine.

(Prior art) Generally, an eccentric shaft in a rotary piston engine is rotatably supported by a bearing part of a housing via a bearing metal, and the bearing metal is press-fitted and fixed into the bearing part of the housing. (Refer to Japanese Patent Application Laid-Open No. 60-69208, etc.).

(Problem to be solved by the invention) However, in the case of a multi-cylinder rotary piston engine, the eccentric shaft has a long length and rotates at high speed and high output, so the bearing part between the eccentric shaft and the housing is The grinding behavior caused between the bearing metal and the side bearing metal increases significantly. Therefore, simply fixing the bearing metal to the bearing part of the housing by press-fitting it as in the past is insufficient, and the bearing metal rotates with the rotation of the eccentric shaft, lubricating the space between them. or the bearing metal may come off from the bearing part of the housing.

Therefore, in order to solve this problem, as a fixing member to securely fix the bearing metal to the bearing part of the housing, for example, a screw lock member that engages with the bearing metal from the bearing part side of the housing is separately provided. It is possible that

However, in this case, if the tip of the screw lock member is pressed into engagement with the outer peripheral surface of the bearing metal to fix the bearing metal to the housing bearing, the tip of the screw lock member is pressed against the bearing metal with a considerably large force. As a result, the bearing metal may be distorted on the inner circumferential surface side at the portion where it contacts the screw lock member, and there is a risk that seizure may occur at the distorted portion due to friction with the eccentric shaft. On the other hand, if the bearing metal is fixed to the housing bearing portion by inserting and engaging the tip of the screw lock member into a hole provided in the bearing metal, the screw lock member protrudes from the hole toward the inner peripheral surface of the bearing metal. There is a risk of seizure between the tip and the eccentric shaft.

The present invention has been developed in view of these points, and its purpose is, in particular, to form an oil groove on the inner circumferential surface of the bearing metal for lubrication between the bearing metal and the eccentric shaft. By fixing the bearing metal to the bearing part of the housing using a locking member such as the above-mentioned screw locking member in this oil groove part, we can prevent the occurrence of seizure due to distortion of the bearing metal or protrusion of the locking member. , to reliably prevent the bearing metal from rotating and coming off.

(Means for solving the problem) In order to achieve the above object, the solution of the present invention is such that the eccentric shaft is rotatably supported by the bearing part of the housing via the bearing metal press-fitted into the bearing part. The rotary piston engine includes a locking member for fixing the bearing metal to the bearing portion of the housing. The locking member is located in the oil groove of the bearing metal.

(Function) With the above configuration, in the present invention, the bearing metal is not only press-fitted into the bearing part of the housing, but also fixed by the locking member, so that the fixation is strong. This will prevent the bearing metal from rotating or coming off.

Moreover, since the locking member is located in the oil groove of the bearing metal, when the tip of the locking member is pressed into engagement with the outer peripheral surface of the bearing metal, the bearing metal is distorted due to the pressing force. Even if this occurs, the distortion is limited to the oil groove and does not occur on the inner circumferential surface in contact with the eccentric shaft, so that seizure due to wear between the distorted part and the eccentric shaft does not occur. Furthermore, when the tip of the locking member is inserted into and engaged with the hole provided in the oil groove of the bearing metal, the tip of the locking member protruding from the hole is located within the oil groove and does not come into contact with the eccentric shaft.
No burn-in occurs.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

Figure 1 shows the structure of one cylinder part in a multi-cylinder rotary piston engine according to the present invention.
is a housing, and the housing 1 includes a rotor housing 2 having a trochoid-shaped inner peripheral surface.
A working chamber (cylinder) 4 is formed by the rotor housing 2 and side housings 3, 3 located on both sides of the rotor housing 2. 5 is an eccentric shaft extending through the axial center of the housing 1; 6 is a rotor that is supported by the eccentric shaft 5 and performs planetary rotation within the working chamber 4 of the housing 1; The interior of the working chamber 4 is divided into three chambers, and each step of suction, compression, explosion, expansion, and exhaust is sequentially performed as a combustion cycle.

Reference numeral 7 denotes a substantially cylindrical fixed gear attached to the side housing 3 by bolts 8, . The eccentric shaft 5 is rotatably supported therebetween. 10 is an internal gear attached to the rotor 6, and the internal gear 1
0 engages with the teeth 7a of the fixed gear 7 and rotates planetarily around the fixed gear 7 together with the rotor 6. 11 is a water jacket formed in the housing 1.

Then, on the inner circumferential surface of the bearing metal 9, a second
As shown in the figures and FIG. 3, an annular oil groove 12 is formed, and oil is supplied to the oil groove 12 through an oil supply passage 13 formed in the eccentric shaft 5, and the bearing metal 9 and It is designed to lubricate the space between it and the eccentric shaft 5. Also, Figures 2 and 3
In the figure, reference numeral 14 denotes a screw lock member that fixes the bearing metal 9 in a press-fitted state to the stationary gear 7, and the screw lock member 14 is located in the oil groove 12 of the bearing metal 9. That is, the bearing metal 9 has the engagement hole 15 at the bottom of the oil groove 12, and the fixed gear 7 has the engagement hole 15.
Screw holes 16 are provided corresponding to the screw holes 16, respectively, and by screwing the screw lock member 14 into the screw holes 16 and inserting and engaging the tip of the screw lock member 14 into the engagement hole 15, the bearing can be secured. The metal 9 is fixed to the fixed gear 7 at the position of the oil groove 12.

Therefore, in the above embodiment, the bearing metal 9 is not only fixed to the fixed gear 7, which is the bearing part of the housing 1, by press fitting as in the conventional case, but also by fixing the bearing metal 9 to the fixed gear 7, which is the bearing part of the housing 1, by simply press-fitting it. A screw is inserted into and engaged with the engagement hole 15 of the bearing metal 9.
Since the bearing metal 9 is firmly fixed by the locking member 14, even if severe grinding behavior occurs between the bearing metal 9 and the eccentric shaft 5, the bearing metal 9
does not rotate with the rotation of the eccentric shaft 5 or come off from the fixed gear 7, and maintains good lubrication with the eccentric shaft 5 to effectively perform its function as the bearing metal 9. be able to.

Moreover, the screw lock member 14 is inserted into and engaged with an engagement hole 15 provided at the bottom of the oil groove 12 of the bearing metal 9 so that the screw lock member 14 is positioned in the oil groove 12 of the bearing metal 9. The tip of the screw lock member 14 that protrudes from the hole 15 toward the inner peripheral surface of the bearing metal 9 is located within the oil groove 12 and does not come into contact with the eccentric shaft 5, thereby preventing seizure due to contact between the two. It will never occur.

In the above embodiment, the screw lock member 1
4 to fix the bearing metal 9 to the bearing part (fixed gear 7) of the housing 1.
An engagement hole 15 is provided in the oil groove portion 12 of the engagement hole 15.
Although the tip of the screw lock member 14 is inserted into and engaged with the oil groove portion 12, the tip of the screw lock member 14 may be pressed into engagement with the outer peripheral surface of the bearing metal 9 at the position of the oil groove portion 12. In this case, even if the bearing metal 9 is distorted by the pressing force from the tip of the screw lock member 14,
The distortion is limited to the oil groove portion 12 and does not occur on the inner peripheral surface of the bearing metal 9 that is in contact with the eccentric shaft 5.
Seizing due to friction with the eccentric shaft 5 does not occur at the strained location.

Further, in the above embodiment, the fixed gear 7 attached to the side housing 3 also functions as a bearing part of the housing 1, and the fixed gear 7
Although the embodiment is applied to the case where the bearing metal 9 is press-fitted into the housing 1, it is of course applicable to the case where the bearing metal 9 is directly press-fitted into the side housing 3 as a bearing portion of the housing 1.

(Effect of the invention) As described above, according to the bearing structure of the rotary piston engine according to the invention, the locking member for fixing the bearing metal press-fitted into the bearing part of the housing is located in the oil groove part of the bearing metal. Therefore, while preventing the occurrence of seizure due to distortion of the bearing metal or protrusion of the tip of the lock member, it is possible to firmly fix the bearing metal and reliably prevent its rotation or coming off.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a longitudinal side view showing the structure of one cylinder in a multi-cylinder rotary piston engine; FIG. 2 is a longitudinal side view showing the bearing structure of the engine; FIG. 3 is a sectional view taken along the - line in FIG. 2. 5... Eccentric shaft, 7... Fixed gear, 9... Bearing metal, 12... Oil groove, 14... Screw lock member.

Claims (1)

[Scope of utility model registration request] A rotary piston engine in which an eccentric shaft is rotatably supported by a bearing part of a housing via a bearing metal press-fitted into the bearing part, comprising a locking member for fixing the bearing metal to the bearing part of the housing, the locking member A bearing structure for a rotary piston engine, characterized in that the bearing is located in the oil groove of the bearing metal.