JP2018159323A - Rocker shaft assembly - Google Patents

Abstract

An object of the present invention is to reduce friction during engine operation while preventing deterioration of assemblability. A plurality of rocker shaft assemblies disclosed by the present specification are arranged on a rocker shaft and an axis of the rocker shaft, and are attached to be swingable around the axis of the rocker shaft. A plurality of rocker arms 30, a plurality of rocker arms 30 and a plurality of supports 40 arranged on the axis line 21 of the rocker shaft 20, and a coil capable of pressing the rocker arm 30 in the axial direction of the rocker shaft 20. The spring 60 is disposed on the axis line 21 of the rocker shaft 20 to compress the coil spring 60 and restricts the rocker arm 30 from swinging. The coil 60 is retracted from the axis line 21 of the rocker shaft 20. With the release position to release the spring 60 A clamping member 70 movable, and configured to include a. [Selection] Figure 1

Description

  The technology disclosed herein relates to a rocker shaft assembly.

  Conventionally, a rocker arm structure described in Japanese Patent Application Laid-Open No. 2007-224845 (Patent Document 1 below) is known as a rocker arm mounting structure for a rocker shaft attached to a cylinder head. The rocker arm structure includes a rocker shaft, a plurality of rocker arms attached to the rocker shaft, and a spring member interposed between a pair of adjacent rocker arms. The spring member is subjected to a surface treatment that reduces sliding resistance with the rocker arm. As a result, wear on the end face of the rocker arm is reduced.

JP 2007-224845 A

  However, the surface treatment applied to the spring member in the above-described rocker arm structure is a film formed by, for example, applying molybdenum disulfide to the spring member, and there is a limit in maintaining the film. If it is assumed that molybdenum disulfide is applied periodically to maintain such a coating, maintenance costs such as application become a problem. Further, since the support for attaching the rocker shaft to the engine head and the side surface of the rocker arm are in contact with each other, friction due to rocking of the rocker arm during engine operation occurs, resulting in poor fuel consumption.

  Therefore, as a means to eliminate friction, a method such as placing a collar instead of a spring member can be considered, but if the friction is lost, the rocker arm posture cannot be maintained, and the rocker arm collapses during engine assembly work. Since it is necessary to work using a jig that does not interfere with the engine head and other parts, there is a concern that workability will deteriorate. As described above, it is not easy to reduce the friction associated with rocking the rocker arm during engine operation while maintaining the rocker arm posture without using a jig during engine assembly work.

  A rocker shaft assembly disclosed by the present specification includes a rocker shaft, a plurality of rocker arms arranged on an axis of the rocker shaft, and attached so as to be swingable around the axis of the rocker shaft. A plurality of supports disposed on the axis of the rocker shaft together with the rocker arm, a plurality of supports for supporting the rocker shaft, a coil spring capable of pressing the rocker arm in the axial direction of the rocker shaft, and an axis of the rocker shaft It is possible to move between a compression position that compresses the coil spring by restricting the rocker arm from swinging and a release position that releases the coil spring by retracting from the axis of the rocker shaft. And a clamp member.

  According to such a configuration, when the support is bolted to the engine head, the rocker arm is pressed in the axial direction of the rocker shaft by the coil spring by keeping the clamp member in the compressed position, and the rocker arm and Friction can be generated between adjacent members. Therefore, swinging of the rocker arm is restricted, and a jig for holding the rocker arm so as not to interfere with the engine head becomes unnecessary.

  Since the coil spring is released by moving the clamp member from the compression position to the release position after the support is bolted to the engine head, it is possible to reduce the friction associated with rocking of the rocker arm during engine operation.

The rocker shaft assembly disclosed in the present specification may have the following configuration.
The clamp member may be attached to the support, and the clamp member may be moved from the compression position to the release position in accordance with a tightening operation of a bolt assembled to the support.
According to such a configuration, when the support is bolted to the engine head, the clamp member moves from the compression position to the release position as the bolt is tightened. Separately, there is no need to move the clamp member.

The clamp member has a substantially gate-like plate shape, and includes a base plate portion provided with a bolt hole for passing the shaft portion of the bolt, and a pair of side plate portions each provided with a shaft hole for passing the rocker shaft, One side plate portion may be mounted between the support and one rocker arm, and the other side plate portion may be mounted between the support and the other rocker arm.
According to such a configuration, since the pair of side plate portions are arranged on one clamp member, the pair of rocker arms arranged on both sides of the support can be simultaneously moved toward the support by one bolt fastening operation. Can do.

An arm pressing portion that protrudes from the side surface of the support toward the side surface of the rocker arm in the compression position is provided at an end portion of the side plate portion that is far from the substrate portion, and the arm pressing portion includes the bolt The distance between the side surface of the rocker arm and the side surface of the support may be equal to the plate thickness of the side plate portion by being disengaged from the side surface of the rocker arm at the release position as the screw is tightened.
According to such a configuration, the distance between the side surface of the rocker arm and the side surface of the support is equal to the protruding height of the arm pressing portion in the compression position and equal to the plate thickness of the side plate portion in the release position.

A convex portion that protrudes toward the side surface of the support at the compression position is provided at an end portion of the side plate portion that is farther from the substrate portion than the arm mounting portion, and the convex surface is provided on the side surface of the support. It is good also as a structure provided with the recessed part which positions the said clamp member in the said compression position because a part latches.
According to such a structure, a clamp member can be positioned in a compression position by latching a convex part and a recessed part.

  According to the rocker shaft assembly disclosed in the present specification, it is possible to prevent deterioration in assembling due to disturbance of the rocker arm posture without using a jig at the time of engine assembly work, and accompanying rocker arm rocking during engine operation. Friction can be reduced.

The front view of the rocker shaft assembly which showed the state which the clamp member in Embodiment 1 exists in a compression position Front view of rocker shaft assembly showing clamp member in release position Top view of rocker shaft assembly showing clamp member in compression position Perspective view of clamp member Top view of the clamp member Front view of clamp member Side view of clamp member AA line sectional view in FIG. Perspective view of support Front view of support Top view of support Side view of support BB sectional view in FIG. The top view of the clamp member in Embodiment 2. CC sectional view in FIG. DD sectional view taken on the line in FIG. Top view of support EE sectional view in FIG. FF sectional view taken on the line in FIG. Sectional drawing which showed the state which cut | disconnected the clamp member in Embodiment 3 in the same position as FIG. Sectional drawing which showed the state which cut | disconnected the support in Embodiment 3 in the same position as FIG.

<Embodiment 1>
Embodiment 1 will be described with reference to FIGS. 1 to 13. The rocker shaft assembly 10 of this embodiment is attached to the engine head 1 of the vehicle as shown in FIGS. 1 and 2. The rocker shaft assembly 10 includes a round bar-shaped rocker shaft 20, a plurality of rocker arms 30 attached to the rocker shaft 20, a plurality of supports 40 attached to the rocker shaft 20, bolts 50, a coil spring 60, The clamp member 70 is provided.

  A plurality of rocker shafts 20 are arranged on the axis 21 of the rocker shaft 20, and a plurality of supports 40 are also arranged on the axis 21 of the rocker shaft 20. In the present embodiment, a pair of rocker arms 30 are arranged on both the left and right sides of the support 40. A coil spring 60 is disposed between the rocker arm 30 and another rocker arm 30 adjacent thereto. Further, a side plate portion 72 (described later) of the clamp member 70 is disposed between the support 40 and the rocker arm 30 adjacent thereto.

  As shown in FIG. 3, the rocker arm 30 is configured to extend straight in an arrangement perpendicular to the axis 21 of the rocker shaft 20 in a plan view. The rocker arm 30 has a shaft insertion hole 32 through which the rocker shaft 20 is inserted, and the rocker shaft 30 is swingable about its axis when the rocker shaft 20 is inserted into the shaft insertion hole 32. In the state of FIG. 3, the rocker arm 30 is pressed in the axial direction of the rocker shaft 20 by the coil spring 60 in a compressed state. Accordingly, the rocker arm 30 is pressed against the clamp member 70, and the rocker arm 30 is held in a horizontal posture by a frictional force generated between the side surface 31 of the rocker arm 30 and the clamp member 70. Therefore, the rocker arm 30 is not swung by its own weight and does not interfere with the engine head 1.

  The support 40 is a member that supports the rocker shaft 20 and is fixed to the engine head 1, and is fastened to the engine head 1 by a bolt 50. As shown in FIG. 9, the support 40 has a main insertion hole 41 through which the rocker shaft 20 is inserted, and a sub insertion hole 42 through which the shaft portion 51 of the bolt 50 is inserted. As shown in FIG. 13, the main insertion hole 41 and the sub insertion hole 42 are arranged orthogonally and communicate with each other. The main insertion hole 41 has a larger diameter than the sub insertion hole 42.

  As shown in FIG. 9, the side surface 43 of the support 40 is an annular plane provided at the hole edge of the main insertion hole 41. The side surface 43 of the support 40 is provided with a concave portion 44 that is recessed in an arc shape. As shown in FIG. 12, the recess 44 is located at the lower end of the main insertion hole 41.

  As shown in FIG. 2, the bolt 50 has a shaft portion 51 that is inserted into the sub insertion hole 42 of the support 40, and the shaft portion 51 projects downward from the sub insertion hole 42 and is fastened to the fastening hole 2 of the engine head 1. Has been. The bolt 50 has a head 52 with a washer. The outer diameter of the washer portion of the head 52 is substantially the same as the outer diameter of the fastening seat 45 provided so as to protrude upward from the upper surface of the support 40.

  As shown in FIG. 4, the clamp member 70 includes a base plate portion 71 provided with a bolt hole 74 through which the shaft portion 51 of the bolt 50 is passed, and a pair of side plate portions 72 provided with a shaft hole 75 through which the rocker shaft 20 is passed. It consists of. The clamp member 70 has a substantially portal shape when viewed from the front, and is formed by pressing a plate-shaped metal member. As shown in FIG. 5, the bolt hole 74 is arranged at a position closer to the side plate portion 72 on the left side than the center portion of the substrate portion 71.

  As shown in FIG. 7, the shaft hole 75 has a long hole shape that is long in the vertical direction. The left and right dimensions of the shaft hole 75 are substantially the same as or slightly larger than the outer diameter of the rocker shaft 20. Thereby, the clamp member 70 can be moved in the vertical direction in a state where the rocker shaft 20 is inserted into the shaft hole 75.

  At the lower end of the side plate portion 72, an arm pressing portion 73 and a convex portion 76 are provided. The arm pressing portion 73 is provided continuously upward from the upper end of the convex portion 76. Each of the pair of left and right arm pressing portions 73 has an arc shape in cross section and is configured to protrude in a direction away from each other. On the other hand, each of the pair of left and right convex portions 76 has a cross-sectional arc shape and protrudes in a direction approaching each other. The arm pressing portion 73 is larger than the convex portion 76, and the protruding height from the side plate portion 72 is also larger than the convex portion 76. As shown in FIG. 4, the arm pressing portion 73 is divided by the shaft hole 75. On the other hand, the convex portion 76 is positioned below the shaft hole 75 and connected to the arm pressing portion 73 in a divided state at two locations.

  As shown in FIG. 1, the clamp member 70 is attached to the support 40. The clamp member 70 is movable between a compression position shown in FIG. 1 and a release position shown in FIG. The inner surfaces of the pair of side plate portions 72 are in surface contact with the pair of side surfaces 43 of the support 40.

  In the compressed position, as shown in FIG. 1, the arm pressing portion 73 of the clamp member 70 is arranged between the rocker arm 30 and the side surface 43 of the support 40. At this time, the coil spring 60 is in a compressed state. The rocker arm 30 is pressed against the arm pressing portion 73 by the spring force of the coil spring 60, the arm pressing portion 73 is pressed against the support 40, and the inner surface of the side plate portion 72 is pressed against the side surface 43 of the support 40. Accordingly, the rocker arm 30 is sandwiched between the compressed coil spring 60 and the arm pressing portion 73, and friction is generated between the coil spring 60 and the rocker arm 30, so that the arm pressing portion 73 and the side surface 31 of the rocker arm 30 are generated. Friction occurs between As a result, the rocker arm 30 is held in a horizontal posture by friction, is restricted from swinging by its own weight, and is restricted from interfering with the engine head 1.

  Further, in the compressed position, the pair of convex portions 76 are fitted and locked into the pair of concave portions 44 of the support 40. For this reason, the clamp member 70 can be positioned at the compression position even before the support 40 is assembled to the rocker shaft 20. When the bolt 50 is tightened after the support 40 is assembled to the rocker shaft 20, the head portion 52 of the bolt 50 comes into contact with the base plate portion 71, and the convex portion 76 moves below the concave portion 44 as the bolt 50 is tightened. The locking state is released and the positioning state of the clamp member 70 is released, and the clamp member 70 starts to move from the compression position to the release position. When the clamp member 70 reaches the release position, the bolt 50 is firmly fastened to the fastening hole 2 of the engine head 1, so that the support 40 is fixed to the engine head 1 and the rocker arm 30 is fixed to the engine head 1. It is placed at the mounting position (the upper end surface of the valve cap, etc.), and the rocker arm 30 will not swing due to its own weight.

  In the release position, as shown in FIG. 2, the convex portion 76 is released downward from the concave portion 44 of the support 40, and the arm pressing portion 73 is released downward from the side surface 31 of the rocker arm 30. As a result, the side plate portion 72 of the clamp member 70 is sandwiched between the side surface 31 of the rocker arm 30 and the side surface 43 of the support 40. In other words, the distance between the side surface 31 of the rocker arm 30 and the side surface 43 of the support 40 is substantially equal to the plate thickness of the side plate portion 72 of the clamp member 70. That is, the rocker arm 30 moves toward the support 40 by the dimension of the protruding height of the arm pressing portion 73, and the coil spring 60 is released by the dimension. As a result, the spring force of the coil spring 60 decreases, and the friction generated between the side surface 31 of the rocker arm 30 and the side plate portion 72 of the clamp member 70 decreases. At the same time, the friction generated between the coil spring 60 and the rocker arm 30 is also reduced. Therefore, since the friction associated with the rocking of the rocker arm 30 is reduced during engine operation, an improvement in fuel consumption can be expected.

  As described above, in the present embodiment, when the support 40 is bolted to the engine head 1, the rocker arm 30 is moved in the axial direction of the rocker shaft 20 by the coil spring 60 by keeping the clamp member 70 in the compression position. When pressed, friction can be generated between the rocker arm 30 and a member adjacent thereto. Therefore, rocking of the rocker arm 30 is restricted, and a jig for holding the rocker arm 30 so as not to interfere with the engine head 1 becomes unnecessary.

  Since the coil spring 60 is released by moving the clamp member 70 from the compression position to the release position after the support 40 is bolted to the engine head 1, the friction caused by the rocker arm 30 swinging during engine operation is reduced. can do.

The clamp member 70 is attached to the support 40, and the clamp member 70 may be moved from the compression position to the release position in accordance with the tightening operation of the bolt 50 assembled to the support 40.
According to such a configuration, when the support 40 is bolted to the engine head 1, the clamp member 70 moves from the compression position to the release position as the bolt 50 is tightened. Apart from the work of fastening the bolts, it is not necessary to move the clamp member 70.

The clamp member 70 has a substantially gate-like plate shape, and a pair of side plate portions each provided with a base plate portion 71 provided with a bolt hole 74 through which the shaft portion 51 of the bolt 50 passes and a shaft hole 75 through which the rocker shaft 20 passes. 72, one side plate portion 72 is mounted between the support 40 and one rocker arm 30, and the other side plate portion 72 is mounted between the support 40 and the other rocker arm 30. It is good also as a structure.
According to such a configuration, since the pair of side plate portions 72 are arranged on one clamp member 70, the pair of rocker arms 30 arranged on both sides of the support 40 are directed toward the support 40 by one bolt fastening operation. Can be moved at the same time.

An arm pressing portion 73 that protrudes from the side surface 43 of the support 40 toward the side surface 31 of the rocker arm 30 in the compressed position is provided at an end portion of the side plate portion 72 that is far from the substrate portion 71. As the bolt 50 is tightened, the distance between the side surface 31 of the rocker arm 30 and the side surface 43 of the support 40 becomes equal to the plate thickness of the side plate portion 72 by detaching from the side surface 31 of the rocker arm 30 in the release position. Also good.
According to such a configuration, the distance between the side surface 31 of the rocker arm 30 and the side surface 43 of the support 40 is equal to the protruding height of the arm pressing portion 73 in the compression position, and the thickness of the side plate portion 72 in the release position. Will be equal.

A convex portion 76 that protrudes toward the side surface 43 of the support 40 in the compressed position is provided at an end portion of the side plate portion 72 that is farther from the substrate portion 71 than the arm mounting portion 73. It is good also as a structure provided with the recessed part 44 which positions the clamp member 70 in a compression position because the convex part 76 latches.
According to such a configuration, the clamp member 70 can be positioned at the compression position by locking the convex portion 76 and the concave portion 44.

<Embodiment 2>
Next, Embodiment 2 will be described with reference to FIGS. 14 to 19. In the second embodiment, an anti-rotation mechanism is added to the clamp member 70 and the support 40 of the first embodiment, and the other components are the same as those in the first embodiment, and thus the same components are denoted by the same reference numerals. The description is omitted.

  As shown in FIG. 14, the clamp member 170 according to the second embodiment includes a substrate portion 171 provided with a pair of detent projections 172 and 173. As shown in FIGS. 15 and 16, the right-side detent projection 172 in FIG. 14 has an arcuate cross-section projecting downward from the lower surface of the substrate portion 171. Is the same. On the other hand, on the upper surface 141 of the support 140, as shown in FIG. 17 and FIG. The anti-rotation recesses 142 and 143 are configured so that the anti-rotation protrusions 172 and 173 are fitted and fitted. Can be locked to each other. The pair of detent projections 172 and 173 engage with the pair of detent recesses 142 and 143, thereby preventing the clamp member 170 from being rotated along with tightening of the bolt 50.

<Embodiment 3>
Next, Embodiment 3 will be described with reference to FIGS. 20 and 21. FIG. In the third embodiment, the shapes of the rotation prevention convex portions 172 and 173 and the rotation prevention concave portions 142 and 143 of the second embodiment are changed, and the other configurations are the same as those in the second embodiment. The same code | symbol shall be attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 20, the clamp member 270 of the third embodiment has a detent protrusion 272 having a cross-sectional square shape that protrudes downward from the lower surface of the substrate portion 271. On the other hand, on the upper surface 241 of the support 240, as shown in FIG. The anti-rotation recess 242 is configured such that the anti-rotation protrusion 272 fits therein, and the anti-rotation recess 242 and the anti-rotation protrusion 272 can be locked to each other in the rotation direction of the bolt 50. The rotation of the clamp member 270 accompanying the tightening of the bolt 50 can be prevented by the locking projection 272 engaging with the locking recess 242.

<Other embodiments>
The technology disclosed in the present specification is not limited to the embodiments described with reference to the above description and drawings, and includes, for example, the following various aspects.
(1) In the above embodiment, the clamp member is moved from the compression position to the release position as the bolt 50 is tightened. However, after the rocker shaft assembly is attached to the engine head 1, the clamp member is manually moved. It may be moved. The release position may be a position where the clamp member is removed from the support.

  (2) In the above embodiment, the clamp member exemplifies a clamp member having a substrate portion and a pair of side plate portions. However, the clamp member may be a clamp member having only one side plate portion or a clamp member having only one side plate portion. It is good also as a member.

  (3) Although the side plate portion is mounted between the rocker arm 30 and the support in the above embodiment, the side plate portion may be mounted between the coil spring 60 and the rocker arm 30. Further, when the pair of rocker arms 30 are arranged adjacent to each other, a side plate portion may be mounted between the pair of rocker arms 30.

  (4) In the above embodiment, the arm pressing portion 73 has a cross-sectional arc shape and extends in the width direction, but a bulging portion that bulges in a spherical shape may be used as the arm pressing portion.

  (5) In the above embodiment, the convex portion 76 has a cross-sectional arc shape and extends in the width direction. However, a bulging portion that bulges in a spherical shape may be used as the convex portion.

DESCRIPTION OF SYMBOLS 10 ... Rocker shaft assembly 20 ... Rocker shaft 21 ... Axis 30 ... Rocker arm 31 ... Side 40 ... Support 43 ... Side 44 ... Recess 50 ... Bolt 60 ... Coil spring 70 ... Clamp member 71 ... Substrate part 72 ... Side plate part 73 ... Arm Pressing portion 74 ... Bolt hole 75 ... Shaft hole 76 ... Protruding portion 140 ... Support 142, 143, 242, 243 ... Anti-rotation concave portion 170, 270 ... Clamp members 171, 271 ... Substrate parts 172, 173, 272, 273 ... Anti-rotation Convex

Claims (5)

A rocker shaft,
A plurality of rocker arms arranged on the axis of the rocker shaft and attached so as to be swingable around the axis of the rocker shaft;
A plurality of supports arranged on the axis of the rocker shaft together with the plurality of rocker arms, and supporting the rocker shaft;
A coil spring capable of pressing the rocker arm in the axial direction of the rocker shaft;
A compression position that compresses the coil spring by restricting the rocking of the rocker arm by being arranged on the axis of the rocker shaft, and a release that releases the coil spring by retracting from the axis of the rocker shaft A rocker shaft assembly comprising: a clamp member movable between positions.   The clamp member is attached to the support, and the clamp member is moved from the compression position to the release position in accordance with a tightening operation of a bolt assembled to the support. Rocker shaft assembly.   The clamp member has a substantially gate-like plate shape, and includes a base plate portion provided with a bolt hole for passing the shaft portion of the bolt, and a pair of side plate portions each provided with a shaft hole for passing the rocker shaft, The one side plate portion is mounted between the support and the one rocker arm, and the other side plate portion is mounted between the support and the other rocker arm. Rocker shaft assembly.   An arm pressing portion that protrudes from the side surface of the support toward the side surface of the rocker arm in the compression position is provided at an end portion of the side plate portion that is far from the substrate portion, and the arm pressing portion includes the bolt 4. The distance between the side surface of the rocker arm and the side surface of the support becomes equal to the plate thickness of the side plate portion by detaching from the side surface of the rocker arm in the release position as the screw is tightened. Rocker shaft assembly.   A convex portion that protrudes toward the side surface of the support at the compression position is provided at an end portion of the side plate portion that is farther from the substrate portion than the arm mounting portion, and the convex surface is provided on the side surface of the support. The rocker shaft assembly according to claim 4, wherein a concave portion that positions the clamp member at the compression position by locking the portion is provided.

Images