JP2012219773A - Internal combustion engine starting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inhibit the increase of engine resistance after engine start while using an existing engine body equipped with no ring gear, crankshaft side member and one-way clutch as it is.SOLUTION: A ratchet type one-way clutch 30 is provided between a ring gear 16, to which turning force of a start motor 40 is transmitted, and an outer race member 12, which rotates in conjunction with a crankshaft 2, to transmit the turning force in one direction by the start motor 40 from the ring gear 16 to the crankshaft 2 and to intercept transmission of turning force in the opposite direction to the one direction. A spacer 10 having a support part 10d for rotatably supporting the ring gear 16 is provided. The spacer 10 is provided between the engine body (a cylinder block 4, an oil pan 8) and a transmission housing and is formed with bolt holes in which bolts are inserted for tightening together with the transmission housing to the engine body.

Description

  The present invention relates to an internal combustion engine starter in which a one-way clutch is provided between a ring gear to which a rotational force of a starter motor is transmitted and a crankshaft side member that rotates in conjunction with the crankshaft.

  For example, in the internal combustion engine starting device described in Patent Document 1, a one-way clutch is provided between a ring gear to which the rotational force of a starting motor is transmitted and a crankshaft side member that rotates in conjunction with the crankshaft. The one-way clutch transmits the rotational force in one direction by the starting motor from the ring gear to the crankshaft, while interrupting the transmission of the rotational force in the direction opposite to the one direction.

  In the apparatus shown in FIG. 10 of Patent Document 1, a ring gear (220) is provided by providing a ball bearing (234) between an outer race support plate (218) functioning as a crankshaft side member and a ring gear (220). It is designed to be able to rotate. Here, the rotational force of the outer race support plate (218) that rotates integrally with the crankshaft (4) is prevented from being transmitted to the ring gear (220) by the ball bearing (234). However, since the ball bearing (234) is structured to receive the rotational force from the outer race support plate (218), it is a cause of increasing the engine resistance after the engine is started.

  On the other hand, in the apparatus shown in FIG. 1 of Patent Document 1, the oil seal housing of the cylinder block (2) is processed into a cylindrical shape to form a bearing fitting portion (16a), and a ring gear (10 ) Is rotatably inserted into an inner race of a ball bearing (14). That is, the ball bearing (14) is fixed to the engine body side and has a structure that does not receive the rotational force from the outer race support plate (8). For this reason, an increase in engine resistance after the engine is started is suppressed.

JP 2007-32498 A

  By the way, the cylinder block is generally formed by casting. For this reason, in the apparatus shown in FIG. 1, in order to press-fit and assemble the inner race of the ball bearing (14), the outer peripheral surface of the oil seal housing must be cut to obtain a desired shape. Processing is required. Therefore, the existing engine body that does not include the ring gear, the crankshaft side member, and the one-way clutch cannot be used as it is.

  The present invention has been made in view of such circumstances, and the object thereof is to reduce the engine resistance after starting the engine while diverting the existing engine body that does not include the ring gear, the crankshaft side member, and the one-way clutch. An object of the present invention is to provide an internal combustion engine starting device that can suppress an increase.

Hereinafter, means for solving the above-described problems and the effects thereof will be described.
According to the first aspect of the present invention, a one-way clutch is provided between the ring gear to which the rotational force of the starter motor is transmitted and the crankshaft side member that rotates in conjunction with the crankshaft, and is used for starting from the ring gear to the crankshaft. An internal combustion engine starting device that transmits a rotational force in one direction by a motor while interrupting transmission of a rotational force in a direction opposite to the one direction, and includes a spacer having a support portion that rotatably supports the ring gear. The gist of the invention is that the spacer is provided between the engine body and the transmission housing, and has a bolt hole through which a bolt for fastening together with the transmission housing is inserted into the engine body.

  According to this configuration, when assembling, a spacer is disposed between the engine main body and the transmission housing, and a bolt for assembling the transmission housing with respect to the engine main body is inserted into the bolt hole of the spacer so that the engine main body is inserted. The spacer is fixed. That is, a step of directly press-fitting a bearing that rotatably supports the ring gear into the engine body and a step of press-fitting a member that supports the bearing into the engine body are not required. In addition, since the spacer that supports the ring gear is fixed to the engine body side and is not subjected to the rotational force from the crankshaft side member, the support portion or the bearing that supports the ring gear provided on the support portion starts the engine. There will be no engine resistance later. Therefore, it is possible to suppress an increase in engine resistance after starting the engine while diverting the existing engine body that does not include the ring gear, the crankshaft side member, and the one-way clutch.

  According to a second aspect of the present invention, in the internal combustion engine starter according to the first aspect, the spacer, the ring gear, the one-way clutch, and the crankshaft side member are assembled with each other in advance with respect to the engine body. The gist is that it can be assembled.

  According to this configuration, when assembling, the spacer, the ring gear, the one-way clutch, and the crankshaft side member are assembled in advance to form a partial assembly, and this partial assembly is assembled to the engine body. Therefore, assembly can be facilitated.

  According to a first or second aspect of the present invention, as in the third aspect of the present invention, the spacer has a flat plate shape and is formed with a through hole through which the bolt hole and the crankshaft are inserted. And the support portion has a cylindrical shape and extends from the edge portion of the insertion hole. In this case, the spacer according to claim 1 or 2 can be easily realized.

The invention according to claim 4 is the internal combustion engine starter according to claim 3, wherein the support portion is higher in rigidity than the plate portion.
In order to support a ring gear having a large mass, a high rigidity is required for the support portion of the spacer. On the other hand, if the plate portion has the same high rigidity as that of the support portion, this causes problems such as an increase in the weight and volume of the spacer. In this regard, according to the above-described configuration, the support portion is higher in rigidity than the plate portion, and thus the rigidity of the support portion and the plate portion can be set appropriately. Therefore, the occurrence of the above problem can be suppressed.

The invention according to claim 5 is the internal combustion engine starter according to claim 4, wherein the plate portion and the support portion are joined to each other.
According to this configuration, the support portion and the plate portion are formed as separate bodies, and these are joined together to form the spacer. For this reason, it is possible to easily make the materials and thicknesses of the support part and the plate part appropriately different from each other in order to make the rigidity of the support part higher than the rigidity of the plate part.

The invention according to claim 6 is the internal combustion engine starter according to claim 4, wherein the plate portion and the support portion are integrally formed by casting.
According to this configuration, since the plate portion and the support portion are integrally formed by casting, for example, it is easy to increase the rigidity of the support portion by making the thickness of the support portion thicker than the thickness of the plate. it can.

  The invention according to claim 7 is the internal combustion engine starter according to any one of claims 1 to 6, wherein the one-way clutch is a ratchet type one-way clutch.

  According to this configuration, unlike the configuration provided with the sprag type one-way clutch, the claw pieces constituting the one-way clutch do not slide on the inner race portion of the ring gear after the engine is started. For this reason, it can be avoided that the ring gear becomes engine resistance after the engine is started.

1 is a cross-sectional view showing a cross-sectional structure centered on a rear portion of an internal combustion engine, according to an embodiment of an internal combustion engine starter according to the present invention. About the spacer in the embodiment, (a) Front view which shows front structure, (b) Sectional drawing which shows sectional structure along the AA line of (a). Schematic which shows schematic structure of the engine main body in the embodiment, a spacer, and a transmission housing. FIG. 2 is an exploded cross-sectional view showing the engine body, the partial assembly, and the flywheel in an exploded manner with respect to the internal combustion engine in the same embodiment.

  Hereinafter, with reference to FIGS. 1-4, one Embodiment which actualized the internal combustion engine starter based on this invention is described in detail. The internal combustion engine of this embodiment is a series internal combustion engine in which a plurality of cylinders are arranged in series.

  FIG. 1 shows a cross-sectional structure centered on the rear portion of the internal combustion engine of the present embodiment. In FIG. 1, the side close to the cylinder is referred to as “front side”, and the side close to the transmission is referred to as “rear side”. Further, the upper side in the vertical direction is simply referred to as “upper side”, and the lower side in the vertical direction is simply referred to as “lower side”.

  As shown in FIG. 1, a journal bearing portion is constituted by a cylinder block 4 and a crank bearing cap 6 at the rear portion of the internal combustion engine 1, and the journal 2 b of the crankshaft 2 is supported by the journal bearing portion. The rear end 2 a of the crankshaft 2 protrudes rearward from the rear end of the cylinder block 4.

  At the rear end of the cylinder block 4, a semicircular fitting portion 4a is provided protruding rearward. An oil pan 8 is attached below the crank bearing cap 6, and a semi-annular fitting portion 8 a is projected rearward from the rear end of the oil pan 8.

  An oil seal 24 for sealing oil from the inside of the engine body is provided between the inner peripheral surfaces of the fitting portions 4a and 8a and the outer peripheral surface of the large-diameter portion 2c of the crankshaft 2 opposed thereto. It has been. That is, the fitting portions 4a and 8a function as an oil seal housing to which the oil seal 24 is attached.

A substantially disc-shaped spacer 10 is fixed to the rear ends of the cylinder block 4 and the oil pan 8 constituting the engine body.
Here, the structure of the spacer 10 will be described in detail with reference to FIG.

  As shown in FIGS. 2 (a) and 2 (b), the plate portion 10a of the spacer 10 has a substantially disk shape, and an insertion hole 10b is formed at the center, and a cylindrical shape is formed at the edge of the insertion hole 10b. A supporting portion 10d extending backward is also connected. A plurality of bolt holes 10c are formed on the same circumference in the outer edge portion of the plate portion 10a. These bolt holes 10c respectively correspond to a plurality of bolt holes formed in the cylinder block 4 and the oil pan 8 for assembling the transmission housing 50 to the engine body (cylinder block 4 and oil pan 8). Further, the recesses 10e and 10f formed in the plate portion 10a are formed to allow a structure such as the starting motor 40 to escape.

  In the present embodiment, the plate portion 10a is made of iron, and the support portion 10d is made of stainless steel. The plate portion 10a and the support portion 10d are joined to each other by welding. Thus, the support portion 10d has higher rigidity than the plate portion 10a.

  As shown in FIG. 3, the spacer 10 is disposed between the engine body (cylinder block 4, oil pan 8) and the transmission housing 50. Further, the spacer 10 and the transmission housing 50 are fastened to the cylinder block 4 and the oil pan 8 by bolts 51. These bolts 51 are inserted into the bolt holes 10c of the spacer 10 described above.

  As shown in FIG. 1, the first bush 26 is fitted on the outer peripheral surface of the support portion 10 d of the spacer 10. The inner race portion 16b of the ring gear 16 is rotatably supported by the first bush 26. Here, the fitting portion 4a of the cylinder block 4 is located inside the insertion hole 10b of the spacer 10, and a gap is formed between the outer peripheral surface of the fitting portion 4a and the inner peripheral surface of the insertion hole 10b. ing.

A gear portion 16a is formed on the outer peripheral surface of the ring gear 16, and a pinion gear provided on the output shaft of the starting motor 40 is always meshed with the gear portion 16a.
An outer race member 12 having a substantially disc shape and having a hole formed in the center thereof is fixed to the rear end portion 2a of the crankshaft 2. An outer race portion 12b is formed on the outer edge portion of the outer race member 12 and has a substantially cylindrical shape and extends forward.

  A plurality of claw pieces 32 and springs (not shown) are provided at equal intervals in the circumferential direction between the inner peripheral surface of the outer race portion 12b and the outer peripheral surface of the inner race portion 16b. The outer race portion 12b, the inner race portion 16b, the claw piece 32, the spring and the like constitute a ratchet type one-way clutch 30. The one-way clutch 30 transmits a rotational force in one direction from the starting motor 40 to the crankshaft 2 via the ring gear 16, while interrupting transmission of the rotational force from the crankshaft 2 to the ring gear 16.

  A flywheel 20 having a substantially disk shape and having a hole formed in the center thereof is fixed to the rear side of the outer race member 12 in the crankshaft 2. The crankshaft 2, the outer race member 12, and the flywheel 20 are fixed to each other by inserting bolts 22 through the bolt holes 2d and the through holes 12a and 20a formed therein.

Next, with reference to FIG. 4, a method of assembling the internal combustion engine starting device of the present embodiment will be described.
First, as shown on the right side in FIG. 4, with respect to the engine body in which the cylinder block 4, the crank bearing cap 6, the oil pan 8, and the crankshaft 2 are assembled together, the fitting portion 4a of the cylinder block 4 and the crankshaft An oil seal 24 is attached between the two large-diameter portions 2c.

  Further, as shown in the center in FIG. 4, a partially assembled body in which the spacer 10, the ring gear 16, the first bush 26, the claw piece 32, the spring, the grease seal 34, the second bush 28, and the outer race member 12 are assembled in advance. Prepare SA. Incidentally, the one-way clutch 30 of this embodiment is of a grease-enclosed type.

  Next, the partial assembly SA is assembled to the engine body from the rear side, and the flywheel 20 is further assembled from the rear side. Then, the bolts 22 are inserted into the bolt holes 2 d of the crankshaft 2, the outer race member 12, and the through holes 12 a and 20 a of the flywheel 20 and fastened.

Then, after the transmission is assembled to the internal combustion engine 1, the transmission housing 50 is assembled from the rear side thereof.
Next, the operation of this embodiment will be described.

  The transmission housing 50 is assembled to the engine main body (cylinder block 4 and oil pan 8) by bolts 51. Here, the spacer 10 is disposed between the engine main body and the transmission housing 50, and the bolt 51 is inserted into the bolt hole 10c, whereby the spacer 10 is fastened together with the transmission housing 50 and fixed to the engine main body. The ring gear 16 is rotatably supported by the support portion 10d of the spacer 10. For this reason, as shown in FIG. 1 of Patent Document 1 described above, a process of directly press-fitting a ball bearing that rotatably supports the ring gear into the cylinder block, or a bearing that rotatably supports the ring gear is supported. A process of press-fitting the member into the engine body is not necessary.

  Further, the support portion 10 d (spacer 10) that supports the ring gear 16 is fixed to the engine body side, so that the structure does not receive the rotational force from the outer race member 12. For this reason, the first bush 26 (support portion 10d) does not become an engine resistance after the engine is started.

  The ratchet type one-way clutch 30 is preferable in designing the pawl piece 32 of the one-way clutch 30 so as not to slide on the inner race portion 16b of the ring gear 16 after the engine is started.

According to the internal combustion engine starter according to the present embodiment described above, the following effects can be obtained.
(1) A ratchet type one-way clutch 30 is provided between the ring gear 16 to which the rotational force of the starting motor 40 is transmitted and the outer race member 12 that rotates in conjunction with the crankshaft 2. While the rotational force in one direction by the starting motor 40 is transmitted to the shaft 2, the transmission of the rotational force in the direction opposite to the one direction is blocked. A spacer 10 having a support portion 10d that rotatably supports the ring gear 16 is provided. The spacer 10 is provided between the engine body (cylinder block 4 and oil pan 8) and the transmission housing 50, and a bolt hole 10c through which a bolt 51 for fastening together with the transmission housing 50 is inserted into the engine body. Is formed. Specifically, the spacer 10 has a plate portion 10a having a flat plate shape and formed with an insertion hole 10b through which the bolt hole 10c and the crankshaft 2 are inserted. The support portion 10d has a cylindrical shape and extends from the edge of the insertion hole 10b. According to such a configuration, it is possible to suppress an increase in engine resistance after starting the engine while diverting the existing engine body that does not include the ring gear 16, the outer race member 12, and the one-way clutch 30 as they are.

  (2) The spacer 10, the ring gear 16, the one-way clutch 30, the outer race member 12, and the like are configured to be assembled to the engine body in a state in which the spacer 10 is assembled in advance. According to such a configuration, when assembling, the spacer 10, the ring gear 16, the one-way clutch 30, and the outer race member 12 are assembled in advance to form a partial assembly SA, and this partial assembly SA is assembled to the engine body. It is done. Therefore, assembly can be facilitated.

  (3) The support portion 10d has higher rigidity than the plate portion 10a. Specifically, the iron plate portion 10a and the stainless steel support portion 10d are joined to each other by welding.

  A high rigidity is required for the support portion 10d of the spacer 10 to support the ring gear 16 having a large mass. On the other hand, if the plate portion has the same high rigidity as the support portion, this causes problems such as an increase in the weight and volume of the spacer. In this regard, according to the above configuration, since the support portion 10d has higher rigidity than the plate portion 10a, the rigidity of the support portion 10d and the plate portion 10a can be appropriately set. Therefore, the occurrence of the above problem can be suppressed. Moreover, according to the said structure, the support part 10d and the plate part 10a are each formed as a different body, and the spacer 10 is formed by joining these mutually. For this reason, it is possible to easily make the materials and thicknesses of the support portion 10d and the plate portion 10a appropriately different from each other so that the rigidity of the support portion 10d is higher than the rigidity of the plate portion 10a.

Note that the internal combustion engine starting device according to the present invention is not limited to the configuration exemplified in the above embodiment, and can be implemented as, for example, the following forms appropriately modified.
In the above embodiment, the first bush 26 is provided on the outer peripheral surface of the support portion 10 d of the spacer 10, and the inner race portion 16 b of the ring gear 16 is rotatably supported by the first bush 26. However, the present invention is not limited to this, and a ball bearing may be provided on the outer peripheral surface of the support portion 10d, and the ring gear may be rotatably supported by this bearing.

  In the above embodiment, the plate portion 10a of the spacer 10 is made of stainless steel and the support portion 10d is made of iron, but the material of the spacer 10 is not limited to this. In addition, for example, the entire spacer is made of the same material (for example, stainless steel), and the support portion has a higher rigidity than the plate portion by making the support portion thicker than the plate portion. It is good also as what is made.

  -In above-mentioned embodiment, although the plate part 10a and the support part 10d of the spacer 10 were formed separately, and these were joined, this invention is not limited to this. For example, the plate part and support part which comprise a spacer may be integrally formed by casting. In this case, the rigidity of the support part can be easily increased by making the thickness of the support part thicker than the thickness of the plate. Incidentally, you may make it employ | adopt aluminum alloy as a material of a spacer.

  As described in the above embodiment and its modifications, the support portion having higher rigidity than the plate portion causes problems such as an increase in the weight and volume of the spacer while favorably supporting a ring gear having a large mass. It is desirable to suppress this. However, the present invention is not limited to this, and the support portion may have the same rigidity as the plate portion.

  As described in the above embodiment, it is possible to assemble the spacer 10, the ring gear 16, the one-way clutch 30, the outer race member 12 and the like into the partial assembly SA, and assemble it to the engine body. It is desirable to make it easy. However, the present invention is not limited to this, and these parts can be individually assembled to the engine body without using the partial assembly SA.

  As described in the above embodiment, it is preferable to use the grease-filled one-way clutch 30 in terms of simplifying the lubrication system for the claw pieces 32 and the like. However, the one-way clutch is not limited to this, and it can be a so-called dry type one-way clutch that does not use a lubricant in a structure that does not require lubrication, such as a claw piece.

  As described in the above embodiment, the ratchet type one-way clutch 30 is preferably used so that the claw pieces 32 of the one-way clutch 30 do not slide on the inner race portion 16b after the engine is started. That is, it is preferable in that the ring gear 16 is prevented from becoming engine resistance. However, the one-way clutch according to the present invention is not limited to this, and a sprag type one-way clutch can also be adopted. Even in this case, since the spacer that supports the ring gear is fixed to the engine body side and does not receive the rotational force from the crankshaft side member, the ring gear is provided on the support portion or the support portion. The bearing that supports the engine does not become an engine resistance after the engine is started.

  DESCRIPTION OF SYMBOLS 1 ... Internal combustion engine, 2 ... Crankshaft (crankshaft), 2a ... Rear end part, 2b ... Journal, 2c ... Large diameter part, 2d ... Bolt hole, 4 ... Cylinder block, 4a ... Fitting part, 6 ... Crank bearing Cap, 8 ... Oil pan, 8a ... Fitting part, 10 ... Spacer, 10a ... Plate part, 10b ... Insertion hole, 10c ... Bolt hole, 10d ... Support part, 12 ... Outer race member (crankshaft side member), 12a ... through hole, 12b ... outer race, 16 ... ring gear, 16a ... gear part, 16b ... inner race part, 20 ... fly wheel, 20a ... through hole, 22 ... bolt, 24 ... oil seal, 26 ... first bush, 28 2nd bush, 30 ... One-way clutch, 32 ... Claw piece, 34 ... Grease seal, 40 ... Motor for starting, 50 ... Transmission housing 51 ... bolt, SA ... partial assembly body, C ... central axis.

Claims (7)

A one-way clutch is provided between the ring gear to which the rotational force of the starting motor is transmitted and the crankshaft side member that rotates in conjunction with the crankshaft, so that the unidirectional rotational force is transmitted from the ring gear to the crankshaft by the starting motor. On the other hand, an internal combustion engine starting device that cuts off transmission of rotational force in a direction opposite to the one direction,
A spacer having a support portion for rotatably supporting the ring gear;
The internal combustion engine starter characterized in that the spacer is provided between the engine body and the transmission housing and has a bolt hole through which a bolt for fastening together with the transmission housing is inserted into the engine body. The internal combustion engine starter according to claim 1,
An internal combustion engine starter characterized in that the spacer, the ring gear, the one-way clutch, and the crankshaft side member are assembled with each other in advance with respect to the engine body. The internal combustion engine starting device according to claim 1 or 2,
The spacer has a plate shape and has a plate portion formed with an insertion hole through which the bolt hole and the crankshaft are inserted.
The internal combustion engine starter according to claim 1, wherein the support portion has a cylindrical shape and extends from an edge portion of the insertion hole. The internal combustion engine starter according to claim 3,
The internal combustion engine starter according to claim 1, wherein the support portion is higher in rigidity than the plate portion. The internal combustion engine starting device according to claim 4,
The internal combustion engine starting device, wherein the plate portion and the support portion are joined to each other. The internal combustion engine starting device according to claim 4,
The internal combustion engine starting device, wherein the plate portion and the support portion are integrally formed by casting. The internal combustion engine starter according to any one of claims 1 to 6,
The internal combustion engine starting device, wherein the one-way clutch is a ratchet type one-way clutch.

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