JP7247084B2 - Engine PTO device - Google Patents

Description

TECHNICAL FIELD The present invention relates to an engine PTO device, and more particularly to an engine PTO device in which rolling bearings of a PTO shaft have high lubricity.

Conventionally, there is a transmission device arranged on the rear side of the rear end wall of the crankcase, a transmission cover that covers the transmission device from the rear side, a lateral projecting portion laterally projecting from the rear end of the crankcase, and a lateral projection. There is a PTO device for an engine that includes a rolling bearing attached to the rear side of an overhanging wall of the engine and a PTO shaft whose rear end is supported by the rolling bearing (see, for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 2009-74505 (see FIG. 2)

<Problem> The lubricity of the rolling bearing of the PTO shaft is low.
In the engine of Patent Document 1, the rolling bearing of the PTO shaft is lubricated by a splash lubrication method, and the lubricity of the rolling bearing of the PTO shaft is low.

SUMMARY OF THE INVENTION An object of the present invention is to provide an engine PTO device in which the rolling bearing of the PTO shaft has high lubricity.

The main configuration of the present invention is as follows.
As illustrated in FIG. 1(B), an oil supply passage (6) provided in the front end wall (2a) of the crankcase (2) and the front surface of the projecting wall (2c) of the laterally projecting portion (2b) A circular recess (2d) recessed backward from (2ca) and a rear side recessed backward leaving an annular surface (2db) on the outer peripheral edge of the inner end surface (2da) of the circular recess (2d) The recess (2e), the outer peripheral surface (4aa) of the outer race (4a) of the rolling bearing (4) fitted in the circular recess (2d), and the rear of the outer race (4a) received by the annular surface (2db). An end face (4ab), an oil inlet gap (6a) along the outer peripheral surface (4aa) of the outer race (4a), and an oil ejection gap (6b) along the rear end face (4ab) of the outer race (4a). The engine oil (6c) pumped through the supply passage (6) passes through the oil inlet gap (6a), the oil ejection gap (6b), and the rear recessed portion (2e) in order as shown in FIG. 1(A). , is configured to be supplied to the race gap (4b) of the rolling bearing (4),
As illustrated in FIG. 1(C), when viewed in a direction parallel to the central axis (2dd) of the circular recess (2d), the oil ejection gap (6b) extends from the oil inlet gap (6a) to the rear recess (2e). ), the PTO device of an engine characterized by being constructed such that its width gradually widens.

The present invention has the following effects.
<<Effect>> The lubricity of the rolling bearing (4) can be enhanced.
As illustrated in FIG. 1(B), the engine oil (6c) pumped through the oil supply passage (6) of the crankcase (2) flows into the oil inlet gap (6a), the oil ejection gap (6b), and the rear As shown in FIG. 1A, it is supplied to the race gap (4b) of the rolling bearing (4) through the side recess (2e) in order, and the rolling bearing (4) is forcibly lubricated. The lubricity of (4) can be enhanced.
<Effect> The lubricity of the rolling bearing (4) can be enhanced.
Since the engine oil (6c) spreads in the width direction within the oil jetting gap (6b), it is supplied to a wide range of the gap (4b) between the races of the rolling bearing (4), improving the lubricating properties of the rolling bearing (4). can be enhanced.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure explaining the PTO apparatus of the engine which concerns on embodiment of this invention, FIG.1(A) is a top view of a cross section of a PTO apparatus, FIG.1(B) is a B section enlarged view of FIG.1(A), FIG. (C) is a view in the direction of arrow C without the rolling bearing of FIG. 1(B). FIG. 2 is a right side view of the engine provided with the PTO device of FIG. 1; Figure 3 is a front view of the engine of Figure 2; 3 is a left side view of the engine of FIG. 2; FIG.

1 to 4 are diagrams illustrating a PTO device for an engine according to an embodiment of the present invention. In this embodiment, a vertical in-line multi-cylinder diesel engine will be described.

The outline of this engine is as follows.
As shown in FIG. 2, this engine includes a cylinder block (15), a cylinder head (16) assembled on the upper part of the cylinder block (15), and a cylinder head cover (16) assembled on the upper part of the cylinder head (16). 17), a transmission cover (3a) disposed on the front side of the cylinder block (15) with the installation direction of the crankshaft (1) as the front-rear direction and one of the front-rear directions as the front, and a transmission cover (3a) disposed at the rear of the cylinder block (15). It has an arranged flywheel (20) and an oil pan (29) assembled under the cylinder block (15).

As shown in FIGS. 2 and 3, with the horizontal direction orthogonal to the front-rear direction as the horizontal direction, the intake manifold 21 is mounted on the right side of the cylinder head 16, and the intake manifold 21 An intake throttle (22) assembled to the intake inlet of the engine, a common rail (23) installed on the right side of the cylinder head cover (17), and a fuel supply pump (24) located on the right side of the cylinder block (15). As shown in FIG. 4, it has an exhaust manifold (25) mounted on the left side of the cylinder head (16) and a supercharger (26) mounted on the exhaust outlet of the exhaust manifold (25).

The fuel supply system for this engine is a common rail fuel injection system comprising a fuel supply pump (24) and a common rail (23) shown in FIGS.
The intake device of this engine includes an air cleaner (not shown), an air compressor (26a) of a supercharger (26) shown in FIG. 4, an intake throttle (22) shown in FIGS. ).
The exhaust system of this engine includes an exhaust manifold (25), an exhaust turbine (26b) of a supercharger (26), and an exhaust treatment device (28) shown in FIGS. The exhaust treatment device (28) accommodates a DOC (not shown) and a DPF (not shown) in an exhaust treatment case (28a). DOC is an abbreviation for Diesel Oxidation Catalyst, and DPF is an abbreviation for Diesel Particulate Filter.

As shown in FIG. 1(A), this engine includes a transmission 3 arranged in front of the front end wall 2a of the crankcase 2, and a transmission cover covering the transmission 3 from the front. 3a), a lateral protrusion (2b) laterally protruding from the front end of the crankcase (2), and a rolling bearing (4) attached to the front side of the protrusion wall (2c) of the lateral protrusion (2b). ) and a PTO shaft (5) having a rear end (5a) bearing on a rolling bearing (4).

As shown in FIG. 3, the transmission (3) is a timing transmission gear train, comprising a crank gear (3c), a first idle gear (3d) meshed with the crank gear (3c), and a first idle gear. A valve gear (3e), a second idle gear (3f) and a third idle gear (3g) meshed with (3d) respectively, and a fuel supply pump input gear (3g) meshed with the second idle gear (3f) 3h) and a PTO shaft input gear (5b) meshed with the third idle gear (3g).
PTO is an abbreviation for power take-off, which means power take-off.
The PTO shaft (5) shown in FIGS. 1(A) and (B) takes out the power of the crankshaft (1) shown in FIGS. 2 to 4 to the PTO drive device (5c).
A hydraulic pump is used for the PTO driving device (5c).

As shown in FIG. 1(B), this engine comprises an oil supply passage (6) provided in the front end wall (2a) of the crankcase (2), and a protruding wall (2c) of the lateral protruding portion (2b). ) and a circular recess (2d) recessed backward from the front surface (2ca) of the circular recess (2d), leaving an annular surface (2db) on the outer peripheral edge of the back end surface (2da) of the circular recess (2d), leaving the back end surface (2da) A rear recessed portion (2e) recessed backward from the central portion of the rolling bearing (4), an outer peripheral surface (4aa) of the outer race (4a) of the rolling bearing (4) fitted in the circular recessed portion (2d), and an annular surface ( 2db), the oil inlet gap (6a) along the outer peripheral surface (4aa) of the outer race (4a), and the rear end surface (4ab) of the outer race (4a). The engine oil (6c) pumped through the oil supply passage (6) passes through the oil inlet gap (6a), the oil ejection gap (6b) and the rear recess (2e) in order. As shown in FIG. 1(A), it is configured to be supplied to the gap (4b) between the races of the rolling bearing (4) via.

As shown in FIG. 1(B), according to the above configuration, the engine oil (6c) pumped through the oil supply passage (6) of the crankcase (2) flows through the oil inlet gap (6a) and the oil ejection gap. As shown in FIG. 1(A), the oil is supplied to the race gap (4b) of the rolling bearing (4) through (6b) and the rear recess (2e) in order, and the rolling bearing (4) is forcibly lubricated. Therefore, the lubricity of the rolling bearing (4) can be enhanced.

An engine oil supply path (18) serving as an oil supply source for the oil supply path (6) shown in FIG. An oil gallery (not shown) provided in the oil gallery, and an oil cooler (7) and an oil filter (27) provided in the middle of the oil gallery.
The engine oil in the oil pan (29) is supplied to the sliding parts such as the bearings of the transmission (3) through the oil gallery by the pumping force of the oil pump. ) and purified by an oil filter (27). The oil supply path (6) branches off from the oil gallery.
The engine oil (6c) that has flowed into the transmission cover inner space (3b) from the race gap (4b) of the rolling bearing (4) shown in FIG. 2) returns to the oil pan (29) shown in FIG.

As shown in FIG. 1(C), when viewed in a direction parallel to the center axis (2dd) of the circular recess (2d) (see FIG. 1(A)), the oil ejection gap (6b) is the same as the oil inlet gap (6a). ) toward the rear recessed portion (2e), the width of the recessed portion (2e) gradually widens.

As shown in FIG. 1(C), according to the above configuration, the engine oil (6c) spreads in the oil ejection gap (6b) in the width direction, so that the gap (4b) between the races of the rolling bearing (4) and can increase the lubricity of the rolling bearing (4).

As shown in FIG. 1(B), the oil inlet gap (6a) is configured by a recessed space formed by recessing a part of the inner peripheral surface (2dc) of the circular recess (2d), and an oil jetting gap. (6b) is composed of a recessed space formed by recessing a part of the annular surface (2db).

According to the above configuration, as shown in FIG. 1(B), the throttling resistance of the oil inlet gap (6a) and the oil ejection gap (6b) is controlled by adjusting the recessed dimensions of the recessed spaces that constitute them. It is possible to easily adjust the injection amount of the engine oil (6c) from the oil injection gap (6b).

As shown in FIG. 1(C), when viewed in a direction parallel to the central axis (2dd) of the circular recess (2d) (see FIG. 1(A)), the oil inlet gap (6a) A part of the inner peripheral surface (2dc) of the oil ejection gap (6b) is formed by recessing a part of the annular surface (2db) in a semicircular shape. It consists of a recessed space.
Then, as shown in FIG. 1(C), when viewed in a direction parallel to the central axis (2dd) of the circular recess (2d) (see FIG. 1(A)), the recessed space of the oil inlet gap (6a) is The circular arc of the outer circumference and the circular arc of the outer circumference of the recessed space of the oil ejection gap (6b) are configured to match.

According to the above configuration, a part of the inner peripheral surface (2dc) of the circular concave portion (2d) shown in FIG. Since the recessed space that is recessed in an arc shape and the recessed space that is partially recessed in a semicircular shape on the annular surface (2db) can be continuously processed, the oil inlet gap (6a) and the oil The ejection gap (6b) can be processed quickly.

As shown in FIG. 1(A), the front opening (4ba) of the inter-race clearance (4b) of the rolling bearing (4) faces the PTO shaft input gear (5b) from behind.
According to the above configuration, as shown in FIG. 1(A), the engine oil (6c) flowing out from the front opening (4ba) of the gap (4b) between the races (4b) of the rolling bearing (4) flows into the PTO shaft input gear (5b). , the PTO shaft input gear (5b) is highly lubricated.

As shown in FIG. 1(B), in this embodiment, the front side of the oil inlet gap (6a) is closed, but the oil inlet gap (6a) has a front opening (6aa) (imagined in FIG. 1(B)). A line (indicated by a two-dot chain line) may be provided. That is, a configuration may be employed in which a front opening (6aa) is provided in the oil inlet gap (6a), and this front opening (6aa) faces the transmission device (3) from the rear side.

When the above configuration is adopted, as shown in FIG. 1(B), part of the engine oil (6c) supplied from the oil supply passage (6) to the oil inlet gap (6a) flows into the front opening (6aa). ) to the transmission device (3), the transmission device (3) has high lubricity.

(1)...crankshaft, (2)...crankcase, (2a)...front end wall, (2b)...horizontal projecting portion, (2c)...projecting wall, (2ca)...front surface, (2d)...circular concave portion, (2da)... deep end surface (2db)... annular surface (2dc)... inner peripheral surface (2dd)... central axis line (2e)... rear concave portion (3)... transmission device (3a)... transmission cover , (4)...rolling bearing, (4a)...outer race, (4aa)...outer peripheral surface, (4ab)...rear end face, (4b)...gap between races, (4ba)...front opening, (5)...PTO shaft , (5a) ... rear end portion, (5b) ... PTO shaft input gear, (6) ... oil supply path, (6a) ... oil inlet gap, (6aa) ... front side opening, (6b) ... oil ejection gap, ( 6c) Engine oil.

Claims (5)

With the installation direction of the crankshaft (1) as the front-rear direction and one of the front-rear directions as the front,
A transmission device (3) arranged on the front side of a front end wall (2a) of the crankcase (2), a transmission cover (3a) covering the transmission device (3) from the front side, and a front end portion of the crankcase (2) facing sideways. a rolling bearing (4) attached to the front side of the projecting wall (2c) of the horizontal projecting portion (2b); and a PTO shaft bearing the rolling bearing (4). In an engine PTO device comprising (5),
An oil supply passage (6) provided in the front end wall (2a) of the crankcase (2) and a circular shape recessed rearward from the front surface (2ca) of the overhang wall (2c) of the lateral overhang (2b). A recessed portion (2d), a rear recessed portion (2e) recessed backward leaving an annular surface (2db) at the outer peripheral edge portion of a rear end surface (2da) of the circular recessed portion (2d), and a circular recessed portion (2d). The outer peripheral surface (4aa) of the outer race (4a) of the rolling bearing (4) fitted inside, the rear end surface (4ab) of the outer race (4a) received by the annular surface (2db), the outer race (4a) Equipped with an oil inlet gap (6a) along the outer peripheral surface (4aa) of the outer race (4a) and an oil ejection gap (6b) along the rear end surface (4ab) of the outer race (4a), the engine pumped through the oil supply path (6) The oil (6c) is configured to be supplied to the inter-race clearance (4b) of the rolling bearing (4) through the oil inlet clearance (6a), the oil ejection clearance (6b) and the rear recessed portion (2e) in this order. ,
When viewed in a direction parallel to the central axis (2dd) of the circular recess (2d), the width of the oil ejection gap (6b) gradually widens from the oil inlet gap (6a) toward the rear recess (2e). An engine PTO device characterized by: In the engine PTO device according to claim 1 ,
The oil inlet gap (6a) is formed by recessing a part of the inner peripheral surface (2dc) of the circular recess (2d), and the oil ejection gap (6b) is formed on the annular surface (2db). A PTO device for an engine, characterized in that it is constituted by a partially recessed recessed space. In the engine PTO device according to claim 2 ,
When viewed in a direction parallel to the central axis (2dd) of the circular recess (2d), the oil inlet gap (6a) is formed by recessing a part of the inner peripheral surface (2dc) of the circular recess (2d) in an arc shape. In addition to being configured as a recessed space, the oil ejection gap (6b) is configured as a recessed space in which a part of the annular surface (2db) is recessed in a semicircular shape,
When viewed in a direction parallel to the central axis (2dd) of the circular recess (2d), the arc of the outer periphery of the recessed space of the oil inlet gap (6a) and the circular arc of the outer periphery of the recessed space of the oil ejection gap (6b) An engine PTO device, characterized in that it is configured to match. In the engine PTO device according to any one of claims 1 to 3 ,
A PTO device for an engine, wherein a front opening (4ba) of a gap (4b) between races (4b) of a rolling bearing (4) faces a PTO shaft input gear (5b) from behind. In the engine PTO device according to any one of claims 1 to 4 ,
A PTO device for an engine, wherein a front side opening (6aa) is provided in an oil inlet gap (6a), and the front side opening (6aa) faces a transmission device (3) from the rear side.

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