JPS62151618A - Bearing device for crankshaft for internal combustion engine - Google Patents

Abstract

PURPOSE:To increase the safety of operation by fixing an deviating member which gives pre-load to a bearing, to a crankcase. CONSTITUTION:An offsetting force in the own way of axial direction is given to the outer race 2b of one bearing 2 by means of an offsetting member 7. The offsetting force is transmitted to an outer race 3b via the inner race 2a and balls 2c of the bearing 2, and balls 3c, and is slightly offset in a thrust direction, causing the outer race 3b to be brought into pressure contact with the flange of the bearing part 6 of a crankcase 1. Accordingly, pre-load is applied to bearings 2, 3, increasing the safety of operation.

Description

Detailed description of the invention (Industrial field of application) Uninvented s, Ltr t9IJ+ '~゛1 +hl+receiving: l'l L of a crankshaft used in an internal combustion engine,
rIV11, WA r'1. k fJJ (7) There is a C that jumps into reduction.

(Prior art) As above, internal combustion 1111! Generally, the crankshaft bearing device of 1 fixes the inner race of the bearing to the japle part of the crankshaft by press fitting, etc.
The outer race is fitted into the bearing portion of the crankcase, so that the crankshaft (A) is rotatably supported by the crankcase.

However, due to the fit tolerance between the crankcase bearing and the outer race, manufacturing errors, etc., there is play between the bearing and the bearing, which causes noise and vibration during crankshaft operation. Sometimes.

Therefore, with the aim of reducing the occurrence of such noise and shooting, for example, as shown in Japanese Utility Model Application Publication No. 58-16421, the 7th outer race of the bearing is biased in the thrust direction by 1J. It is generally customary to give force, dimension (iwa bill, prej'f).

To explain this example as shown in Fig. 4, there is a bearing hole in the clearance between the inner wall surface of the bearing hole of the flange part [) of the crank tooth a and the side surface of the araku race d of the bearing 'I (115G). A positive member R made of Illpoh or the like is interposed on the inner l (- side) with a spring catch C interposed therebetween.

However, in this way, the uneven member 1 is inserted without being fixed in the gap, and the St If the crankcase a is made of aluminum, it may become difficult to apply equal pressure (I/E) or the force may become unstable due to the effects of friction, etc., or if the crankcase a is made of aluminum, the As a result, the inner wall surface of crankcase a was scraped on the end face of J:, and as a result, there was a risk that the +111 spring's A device would change and the preload force would change over time.

This J: such a situation (well, if the structure is such that the biasing member f is held by the flange formed on the crankcase a, and there is a radius (R) in a part of the corner of this flange), (Toggle. This is because the existence of the above-mentioned radius (R) leaves a small space on the outer periphery of the spring support PIAe inserted along the flange side, and this space is shown by the imaginary line. This is because it is easy for the spring that has come off the spring holder PPe and become stuck in the position.

In addition, as mentioned above, if there is a leakage at the flange part of the crankcase a, and if the 1. It is necessary to assemble the eccentric RIS material r etc. in a, and when removing the width member for replacement etc., the crank assembly itself must be removed, and the assembly 4. -1 Is there a problem with the bamboo?

(Object of the Invention) The present invention has been made in view of the above-mentioned problems. By fixing the biasing member itself that applies preload to the crankcase, we have developed a bearing device for a crankshaft for an internal combustion engine that increases the stability of the OJ and improves its smoothness. The aim is to provide. .

(4i4 composition of the invention) The present invention rotatably supports a crankshaft via a bearing in a crankcase, fixes an inner race of the bearing to a journal portion of the crankshaft by press-fitting, etc. In a bearing device for a crankshaft for an internal combustion engine, a race is fitted to a bearing portion of the crankcase so as to be movable in the direction Ilq'a jj.
, comes into contact with one side of the outer race of the bearing,
Q+ to bias this outer lace in one direction +hbh
This is a bearing device for a crankshaft for an internal combustion engine, characterized in that an odd member is fixed to a bearing portion of a crankcase.

With this configuration, the biasing member applies a preload to the bearing 1h11 bridge, reducing operational noise and vibration, and since the biasing part (A) remains fixed, the effects of friction etc. are reduced, and the isobaric pressure is reduced. It is easy to install and stabilize the operation, and it is also possible to insert the cylinder member from the side of the bearing instead of inserting it inside the flange of the crankcase. Therefore, installation is easy.

(Embodiment) FIGS. 1 and 2 show an embodiment of the present invention, in which a crankshaft 4 is rotatably supported by a crankcase 1 via bearings 2 and 3, and an inner The races 2a and 3a are fixed to the journal portion 5 of the crankshaft 4 by press fitting or the like, and the outer race 2b,
3b is fitted into the bearing portion 6 of the crankcase 1 so as to be able to open in the axial direction (loose fit 1'). Then, the inner circumferential portion of this one bearing 2 comes into contact with one side surface of the outer race 2b, and the outer race 2b of this one bearing 2 is brought into contact with one side of the outer race 2b in the axial direction (
The outer periphery of the Q member 7 is fixed to the side surface of the bearing part 6 to the poles 1-8 by a ring-shaped In+ spring that causes it to be biased 11M (to the left in FIG. 1). By fixing the biasing member 7, the outer race 2 of the bearing 2
There are 10 people who can't handle b.

Furthermore, assuming that the outer race 3b of the other bearing 3 is fitted into the bearing seat 9 fixed to the bearing part 6,
Its side surface is connected to the flange of the crankcase 1 forming the receiving part 6, and this flange functions as a member to counteract the biasing force of the part 4J7. A large end 12/] of a connecting rod 11 is fitted into the crank pin 10 of the crankshaft 4 so as to be able to rotate freely once. fixed cylinder,
2c and 3c are balls of the bearings 2 and 3.

As mentioned above, with the biasing member 7, the outer race 2b of one of the bearings 2 is fixed in the axial direction (J in FIG.
3) is applied to the left, and this biasing force is roughly applied to the inner race 2a of the bearing shaft 2 and the ball 2G.
, crankshaft 4. Inner race 3 of bearing bearing 3
a, transmitted to the outer race 3b via the ball 3c,
As shown in the figure, the outer race 3b comes into contact with the flange of the bearing part 6 of the crankcase 1. As a result, an axial quantum, or preload, is applied to the bearing 2.degree. 3, clearance and backlash are reduced as much as possible, and generation of Ig noise and vibration is prevented.

In the present invention, since the biasing member 7 is fixed,
Unlike the conventional method mentioned above, the influence of friction etc. is reduced, and the pressure is equal to 61
It is easy to apply pressure, R pressure is supported, and fl movement is stabilized. 'J change also disappears. Furthermore, since the white part 447 can be fixed to the side surface of the bearing part 6 of the crankcase 1 from one side of the bearing bearing 2, it is necessary to assemble it after assembling the crankshaft 4 into the crankcase 1. Conversely, the biasing member 7 can be removed without removing the crankcase 1, and the assemblability is good.

Also, crank case 1. Due to manufacturing errors such as the crankshaft 4, fitting tolerances of the bearings 2 and 3, etc.
The amount of bias of the bias member 7 must be adjusted so that the preload force does not vary, but in a fixed configuration like the one of the present invention, the outer race of the bearing 2 is 2b and the side surface of the bearing part 6 of the crankcase 1 can be easily measured, and based on this, a disc spring or the like having the required Q (#1) may be installed as the biasing member 7 as appropriate. Therefore, it becomes possible to easily and accurately apply a predetermined preload force to the bearing bearing 3.

FIG. 3 shows another embodiment of the invention. In this embodiment, the biasing member 7 in the previous embodiment is a ring-shaped spring 1 to a collar 7.
a and this shim 7, such as rubber, fixed to the collar 7a.
b, and this stopper 7a is fixed to the side surface of the bearing portion 6 of the crankcase 1 to a pole 1-8 or the like. An appropriate shim 7b may be used depending on the level difference between the outer race 2b of the bearing 2 and the side surface of the bearing portion 6 of the crankcase 1. With the configuration of this embodiment, the same effects as those described above can be obtained.

(Effects of the Invention) As described above, according to the present invention, the inner race of the bearing can be fixed to the crankshaft by 11 people, and the inner race can be fixed to the crankshaft by the inner race of the bearing. In order to add a pre-fitting to the bearing with the aim of reducing noise and vibration, the outer race should be brought into contact with one side of the outer race in the axial direction. By fixing the biasing member to the crankcase on one side, the biasing member is fixed, so if the biasing member is not fixed on the other hand, the position of the biasing member will shift and the preload force on the bearing will change. The operation becomes stable and reliable, and the eccentric 14 member can be installed by assembling the crankshaft into the classy 1 case and then assembling it from the side of the bearing. : Since it can be easily removed without removing or installing the crankcase, assembly is easy.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a bearing device for a crankshaft for an internal combustion engine according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line ■-■ in FIG. 1, and FIG. FIG. 4 is a sectional view showing a conventional example. 1...Crankcase, 2.3...Bearing, 2a, 3a...Inner race, 2b, 3k)...
- Outer race, 45... Crankshaft, 5... Journal portion, 6... Bearing portion, 7... Biasing member, 7a.
...Stopper, 7b...Shim. Figure 1 Figure 2 ■ 3rd [zl 4th procedure? 1 Summer 1 Correction〒Ku spontaneity) 1985 8ri/'7-day 1, Indication of matter 1! 1, 1985 Special revision application No. 297575 2, Title of invention: Internal combustion engine crank "Dancing bearing device" 3. Make amendments. 1. Relationship to the case 14. Name of applicant (807)\7 Maha Motor Co., Ltd. 4. Agent (1) Shin Matsuoka Building 1, 1110-3 Nishiki-cho 1-T, Nishi-ku, Osaka .T'''' Name (Ti782) Patent Attorney Etsu Kotani Principal (the first two persons) Detailed Description of the Invention Column) Brief Description of Drawings Column 7 of the Specification, Contents of Amendment (1) The claims of the specification have been amended as shown in the attached document 1
．． . (2) Page 2 for details, 3rd to 41th, line 10, 15th
line, page 3, line 1, page 7'I, page 12 (-7, '1
Line 3, line 20, page 5, lines 1-2, line 6. Line 11, line 17, page 6, 111. Go to the 2nd line, 3rd line,
8th (1, line 13, line 15, page 7, line 5, 6-
Line 7, Line 9, Lines 10-11, Line 16, Page 8, No. 4
(1, line 11, 15 fi, line 20, page 9, no. 8
Line, line 13. J゛-1 No. 17~181i, 10th true 3rd line, No. 6~
71 (. 7” line, 16th line 1 bearing shaft ji 1 is 1-baud small bearing” and complemented by 11. 2. Range of patent Ωt1 request 1. Crankshaft 1 is connected to the crankcase via a ball bearing.
1 is rotatably supported, and the inner race of the ball bearing is press-fitted or otherwise fixed to the terminal part of the crankshaft, and its outer race is axially supported in the bearing part of the crankcase. Ball Seiei's a.
A biasing member that contacts one side of the cover race and biases the outer race in the axial direction is fixed to the first bearing of the crankcase.1. A bearing device for a crankshaft for an internal combustion engine, which is characterized by:

Claims (1)

[Claims] 1. A crankshaft is rotatably supported in the crankcase via a bearing, and the inner race of the bearing is fixed to the journal part of the crankshaft by press fitting, etc., and the outer race is fixed to the bearing part of the crankcase. In a bearing device for a crankshaft for an internal combustion engine that is slidably fitted in the axial direction of the crankcase, a biasing member that comes into contact with one side of the outer race of the bearing bearing and biases the outer race in one direction in the axial direction is attached to the bearing of the crankcase. A bearing device for a crankshaft for an internal combustion engine, characterized in that the bearing device is fixed to a crankshaft of an internal combustion engine.