JP2010037955A - Method for assembling internal combustion engine starting device - Google Patents

Abstract

A method of assembling an internal combustion engine starter that prevents foreign matter generated when a bearing is press-fitted into a crankshaft from entering a bearing portion of the crankshaft is proposed.
A method of assembling an internal combustion engine starter for assembling an internal combustion engine starter on a crankshaft of an internal combustion engine, wherein the crankshaft is attached to a bearing portion provided in a cylinder block of the internal combustion engine. Then, the crankshaft 2 is fixed by a crank cap 9 that is a bearing member, and then a bearing 16 that is a constituent member of the internal combustion engine starting device is press-fitted into the shaft end portion of the crankshaft 2.
[Selection] Figure 2

Description

  The present invention relates to an assembling method of an internal combustion engine starting device for assembling an internal combustion engine starting device to an internal combustion engine.

Conventionally, when an internal combustion engine starter is assembled to a crankshaft of an internal combustion engine, first, a bearing, which is a member constituting the internal combustion engine starter, is press-fitted and assembled to the crankshaft, and then a starter motor is mounted on the bearing. A ring gear that is a member that transmits the rotational force of the motor to the crankshaft is assembled, and such a technique is publicly known (see, for example, Patent Document 1).
Further, when the bearing is conventionally press-fitted into the crankshaft, as shown in FIG. 4, first, the step of press-fitting the bearing 16 into the shaft end of the crankshaft 2 (FIGS. 4A and 4B). After that, the process of assembling the crankshaft 2 to the cylinder block 1 (FIG. 4C) is performed.
JP 2007-30126 A

  However, in the process described above, the crankshaft 2 is assembled after the bearing 16 is press-fitted into the crankshaft 2, so that a press-fitting burr or the like generated when the bearing 16 is press-fitted into the crankshaft 2 supports the crankshaft 2. There is a risk of being caught as a foreign object in the bearing portion 8 or the metal which is a slide bearing mounted on the bearing portion 8.

  In other words, because the part where the crankshaft slides is exposed and the bearing part on which the metal that dislikes foreign matter is mounted is exposed, it is possible that foreign matter will enter if parts such as a bearing that has generated press-fitting burrs are assembled. It is a factor.

  Therefore, an object of the present invention is to propose an assembling method of an internal combustion engine starting device that prevents foreign matter generated when a bearing is press-fitted into a crankshaft from entering a bearing portion of the crankshaft.

  The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described.

That is, in claim 1,
An internal combustion engine starter assembling method for assembling an internal combustion engine starter to a crankshaft of an internal combustion engine,
The crankshaft is disposed in a bearing portion provided in a cylinder block of the internal combustion engine, the crankshaft is fixed by a bearing member, and then a bearing which is a constituent member of the internal combustion engine starter is attached to the shaft of the crankshaft. It is press-fitted into the end.

In claim 2,
In the bearing, a ring gear is integrally fixed to the outer periphery of the bearing in advance.

  As effects of the present invention, the following effects can be obtained.

  In claim 1, after the crankshaft is fixed to the cylinder block by the bearing member, the bearing is press-fitted, so that the burr at the time of press-fitting is released and is caught as a foreign matter between the crankshaft and the bearing portion. Can be avoided.

  In claim 2, after the crankshaft is fixed to the cylinder block by the bearing member, the bearing is press-fitted, so that the burrs at the time of press-fitting are released and are caught as foreign matter between the crankshaft and the bearing portion. Can be avoided.

Next, embodiments of the invention will be described.
FIG. 1 is a view showing an assembling method of an internal combustion engine starter according to an embodiment of the present invention, FIG. 2 is a schematic side view, FIG. 3 is a perspective view showing a bearing portion and a crank cap, and FIG. It is a figure which shows the assembly | attaching method of an engine starting apparatus.
In the present embodiment, the crankshaft 2 is disposed upside down in order to dispose the crankshaft 2 in the cylinder block 1, and the direction of the arrow X shown in FIGS. The direction of the arrow Y is the upper side when the assembly of the internal combustion engine is completed.
In addition, the same code | symbol is attached | subjected to the member which has the same use and function, and the description is abbreviate | omitted.
The embodiment according to the present invention relates to a step of assembling an internal combustion engine starting device to a crankshaft of an internal combustion engine among the steps of assembling the internal combustion engine. Below, the member used at this process and the assembly | attaching method of the internal combustion engine starting device performed using this member are demonstrated concretely.

  First, the configuration of an internal combustion engine and an internal combustion engine starter to which an internal combustion engine starter assembly method according to an embodiment of the present invention is applied will be described with reference to FIGS. 1 to 3.

  The internal combustion engine is a four-cylinder type automobile engine, and includes a cylinder block 1, a crankshaft 2 pivotally supported by the cylinder block 1, and a cylinder head (not shown) fixed to the upper portion of the cylinder block 1. And an oil pan (not shown) fixed to the lower part of the cylinder block 1 and an internal combustion engine starting device, which will be described later. In the method of assembling the internal combustion engine starter according to this embodiment, the crankshaft 2 and the constituent members of the internal combustion engine starter are assembled to the cylinder block 1 in a state where the cylinder head and the oil pan are not assembled. The example applied to the process is shown.

As shown in FIG. 2, the cylinder block 1 has a plurality of partition walls 3, 3... (Five locations in the present embodiment), and a plurality of cylinders are provided between the partition walls 3. Yes. Pistons 11, 11,... Are slidably inserted into the cylinder. Moreover, each piston 11,11 ... is connected with the crankshaft 2 via the connecting rod 12,12 ....
Further, as shown in FIG. 3, bearing portions 8,..., Which are concave portions having a substantially U-shaped cross section, are provided at the lower portion (upper portion in FIG. 3) of each partition wall 3, 3. ing.

  As shown in FIG. 2, the crankshaft 2 includes crankpins 4, 4... (Four locations in the present embodiment) to which the big ends at the lower ends of the connecting rods 12, 12. .. That support 4 · 4... From both sides, the balance weights 6 · 6 ··· that are heavier than the crank arms 5 · 5 ···, and the bulkhead 3 · 3 are mainly composed of crank journals 7, 7... (5 locations in the present embodiment). The crankshaft 2 is pivotally supported on the lower end (upper end in FIG. 2) of the partition wall 3 of the cylinder block 1. That is, the crank journals 7,... Existing at a plurality of locations in the axial direction of the crankshaft 2 are connected to the bearing portions 8, 8. It is rotatably supported by fastening with a bolt 13 in a state of being sandwiched between crank caps 9, 9. Further, the shaft end portion (rear end) of the crankshaft 2 is provided with a bearing fitting portion 2 a having a larger diameter than the main shaft of the crankshaft 2. A bearing 16 which is a member constituting an internal combustion engine starting device described later is press-fitted into the bearing fitting portion 2a.

The crank cap 9 (also referred to as a bearing cap) is an example of a bearing member that supports the crankshaft 2, and as shown in FIG. 3, a recess 10 having a substantially U-shaped cross section on the side facing the cylinder block 1 of the crank cap 9. Is provided.
Further, the bearing portion 8 which is a concave portion having a substantially U-shaped cross section of the partition wall 3 and the concave portion 10 of the crank cap 9 are opposed to each other, and arc-shaped metals 14 and 14 which are sliding bearings are fitted and attached to each. The crank journals 7, 7... Of the crankshaft 2 are disposed on the bearing portion 8 via the metal 14, 14, and the crank cap 9 is fixed with bolts 13 so as to face the bearing portion 8. The journals 7, 7... Can be rotatably supported.

Of the metals 14 and 14 (also referred to as bearing metal), one metal 14 is fitted and mounted on the inner surface of the bearing portion 8 of the partition wall 3, and the other metal 14 is fitted and mounted on the inner surface of the recess 10 of the crank cap 9. .. Are interposed between the outer peripheral surfaces of the crank journals 7,... Of the crankshaft 2 and the inner surfaces of the bearing portion 8 and the inner surface of the recess 10 of the crank cap 9.
Moreover, the metal 14 and 14 is a shape which divided the cylindrical body into two, and is used by two pairs.

  Of these two metals 14 and 14, the metal 14 disposed on the bearing portion 8 side of the partition wall 3 of the cylinder block 1 is an upper metal, and the metal 14 disposed on the recess 10 side of the crank cap 9 is a lower metal. is called.

  In other words, the crank journals 7, 7,. It is rotatably supported in a state of being sandwiched between a crank cap 9 having a U-shaped recess 10.

  The internal combustion engine starting device mainly includes, for example, a starter motor (not shown), a ring gear 15, and a one-way clutch (not shown) interposed between the ring gear 15 and the crankshaft 2. Is done. The starter motor is provided with a pinion gear (not shown), and the pinion gear and the ring gear 15 fixed to the crankshaft 2 are always meshed with each other.

  The internal combustion engine starting device is a device that starts the internal combustion engine by transmitting the rotational force generated by the starter motor to the crankshaft 2 as a driving force when starting the internal combustion engine.

  The ring gear 15 is a member having a circular shape when viewed from the front and having an opening at the center, and an inner race portion 15 a disposed at the inner periphery of the ring gear 15 and a gear disposed at the outer periphery of the ring gear 15. Part 15b. The ring gear 15 is a member that is interposed between the starter motor and the crankshaft 2 and transmits the rotational force generated by the starter motor to the crankshaft 2.

A bearing 16 is fixed in advance on the inner periphery of the inner race portion 15a, and the ring gear 15 and the bearing 16 constitute a sub-assembly (stop-and-start sub-assembly). That is, when the ring gear 15 and the bearing 16 are assembled to the shaft end portion of the crankshaft 2 as a sub-assembly, the bearing 16 is disposed between the inner race portion 15a of the ring gear 15 and the crankshaft 2, The inner race portion 15a can rotate relative to the crankshaft 2.
In the method for assembling the internal combustion engine starting device according to the present embodiment, which will be described later, the sub-assembly is assembled to the crankshaft 2.

  Here, the members constituting the internal combustion engine and the internal combustion engine starting device described above are assembled by the assembling method of the internal combustion engine starting device according to the present invention described below.

  Next, an assembling method for assembling the members constituting the internal combustion engine starting device to the crankshaft 2 of the internal combustion engine will be described with reference to FIGS.

  When the internal combustion engine starting device is assembled to the internal combustion engine, the overall steps are as follows: first, the crankshaft 2 is disposed in the cylinder block 1, the fastening step in which the crank cap 9 is fastened to the cylinder block 2, and the internal combustion engine. A press-fitting step of press-fitting a sub-assembly that is a member in which a ring gear 15 that is a member constituting the starter and a bearing 16 are integrally fixed in advance into the shaft end portion of the crankshaft 2. . Each step will be specifically described below.

  First, in the arrangement step shown in FIG. 1A, the crankshaft 2 is arranged on the bearing portion 8 provided in the cylinder block 1. Specifically, the crank journals 7, 7... Of the crankshaft 2 are provided below the partition walls 3, 3... Via the metal 14, and the metal 14 (upper metal) is fitted and mounted in advance. It arrange | positions to each bearing part 8 *.

  Next, in the fastening process shown in FIG. 1B, the crank caps 9, 9... Are assembled to the lower ends of the partition walls 3. The shaft 2 is rotatably supported on the cylinder block 1 via the metal 14 and 14 which are sliding bearings.

Subsequently, in the press-fitting process shown in FIG. 1 (c), a sub-assembly in which the ring gear 15 is integrally fixed to the outer periphery of the bearing 16 is press-fitted into the shaft end portion of the crankshaft 2. That is, the inner periphery of the bearing 16 of the subassembly integrated in advance is press-fitted so as to be fitted to the outer periphery of the bearing fitting portion 2 a provided at the shaft end portion of the crankshaft 2.
Thus, according to the present embodiment, the process of fixing the crankshaft 2 to the cylinder block 1 with the crank caps 9, 9... Is performed before press-fitting the bearing 16 that is a constituent member of the internal combustion engine starting device. Therefore, foreign matter generated when the bearing 16 is press-fitted between the bearing 8, the recess 10 of the crank cap 9, and the metal 14, 14 mounted on each of them, and the crankshaft 2 is prevented. it can. That is, since the portion where the crankshaft 2 slides is covered with the crank cap 9 in advance, burrs and foreign matters at the time of press-fitting do not enter the metal 14/14 sliding surface.

  In this way, the internal combustion engine starting device is assembled to the crankshaft 2 of the internal combustion engine, and the crankshaft 2 is attached to the bearing portion 8 provided in the cylinder block 1 of the internal combustion engine. And a bearing fitting portion in which the crankshaft 2 is fixed by a crank cap 9 which is a bearing member, and then a bearing 16 which is a constituent member of the internal combustion engine starting device is provided at the shaft end portion of the crankshaft 2 By applying the method of assembling the internal combustion engine starter that press fits into 2a, it is possible to avoid burrs from being released during press fitting and being caught as foreign matter between the crankshaft 2 and the bearing portion 8.

  In the present embodiment, the bearing 16 is used in a state of being configured in a sub-assembly in which the ring gear 15 is integrally fixed to the outer periphery of the bearing 16 in advance. However, the present invention is not particularly limited. In the case where the bearing 16 constituting the internal combustion engine starting device is first press-fitted into the bearing fitting portion 2a provided at the shaft end portion of the crankshaft 2, the same operation and effect can be obtained. That is, the crankshaft 2 is fixed to the bearing portion 8 of the cylinder block 1 by the crank caps 9, 9. After that, only the bearing 16 is press-fitted into the bearing fitting portion 2 a of the crankshaft 2, and then the ring gear 15. Can be configured to be fixed to the outer periphery of the bearing 16.

  Further, in the present embodiment, an example of fastening and fixing individual crank caps 9 to each of a plurality of crank journals 7 to 7 provided in the crankshaft 2 using the crank cap 9 as a bearing member. However, the present invention is not particularly limited, and it is also possible to apply a crank cap having a so-called ladder beam structure in which the crank caps 9, 9,.

The figure which shows the assembly | attachment method of the internal combustion engine starting device which is one Embodiment of this invention. Similarly a schematic side view. The perspective view which shows a bearing part and a crank cap. The figure which shows the assembly | attaching method of the conventional internal combustion engine starting device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylinder block 2 Crankshaft 8 Bearing part 9 Crank cap 15 Ring gear 16 Bearing

Claims (2)

An internal combustion engine starter assembling method for assembling an internal combustion engine starter to a crankshaft of an internal combustion engine,
The crankshaft is disposed in a bearing portion provided in a cylinder block of the internal combustion engine, the crankshaft is fixed by a bearing member, and then a bearing which is a constituent member of the internal combustion engine starter is attached to the shaft of the crankshaft. A method of assembling an internal combustion engine starting device, wherein the end portion is press-fitted.   2. The method of assembling an internal combustion engine starter according to claim 1, wherein a ring gear is integrally fixed to the outer periphery of the bearing in advance.

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