CN212359879U

CN212359879U - Valve rocker arm assembly

Info

Publication number: CN212359879U
Application number: CN202020393448.5U
Authority: CN
Inventors: 沈宇辉
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Technologies AG and Co KG
Priority date: 2020-03-25
Filing date: 2020-03-25
Publication date: 2021-01-15
Anticipated expiration: 2030-03-25

Abstract

The utility model relates to a valve rocker subassembly. The valve rocker arm assembly includes first and second rocker arm housings rotatably connected to each other, the first rocker arm housing having a pin hole, the second rocker arm housing having a first locking hole, and an intermediate pin installed in the pin hole, and can be partially extended into the first locking hole or fully retracted into the pin hole by axial sliding, the intermediate pin has a flange radially protruding to limit a sliding range of the intermediate pin in the pin hole, the flange axially dividing the intermediate pin into a first section facing the first locking hole and a second section facing away from the first locking hole, the intermediate pin having a center hole extending axially and penetrating to an end of the intermediate pin, a first side hole penetrating from an outer peripheral surface of the first section to the center hole, and a second side hole penetrating from an outer peripheral surface of the second section to the center hole. The utility model discloses a valve rocker subassembly has simple ventilation structure and easily makes.

Description

Valve rocker arm assembly

Technical Field

The utility model relates to an engine technical field. Specifically, the utility model relates to a valve rocker arm subassembly for engine system.

Background

Valvetrains are one of the important components in vehicle engine systems. In general, a valve train is provided with a rocker arm device that converts rotational motion of a cam into linear motion of a valve pushrod. The valve rocker device is matched with the cam mechanism, and the valve is controlled to be opened or closed timely through the self-swinging, so that the air intake and the air exhaust of the engine cylinder are realized. Among them, a switchable valve rocker (SRFF) is generally provided with two rocker mechanisms pivotally connected to each other, and by controlling a connection state between the two rocker mechanisms, an engagement state of a cam and a valve rocker device can be changed, so that a valve lift can be switched between high and low lifts or the valve can be opened for a second time.

In order to lock the two rocker mechanisms in a position enabling synchronous rotation, it is common in the prior art to pass a locking pin through aligned holes in both rocker mechanisms simultaneously. Such a locking mechanism is disclosed for example in US 2005/0028776 a1, in which a locking pin having an annular flange is mounted in a mounting hole of an inner rocker arm, the locking pin being slidable in the mounting hole under the urging of a push rod to project one end into a locking hole of an outer rocker arm, thereby locking the relative rotational position between the inner and outer rocker arms, the middle section of the mounting hole having a larger radius than the two ends, thereby cooperating with the flange to limit the sliding range of the locking pin. Air is present in the cavity area near the flange, and since the mounting hole and the lock pin need to be in abutting contact at both ends, the air in the cavity area is difficult to flow, and therefore resistance is easily generated to the sliding of the lock pin. To reduce this resistance, some prior art designs provide two through holes in the inner rocker arm that communicate the cavities on either side of the flange with the exterior of the inner rocker arm. However, the through hole is difficult to process, so that the production cost is increased.

SUMMERY OF THE UTILITY MODEL

Therefore, the technical problem to be solved by the present invention is to provide a valve rocker arm assembly with a simple ventilation structure.

Above-mentioned technical problem is through according to the utility model discloses a valve rocker subassembly and obtain solving. The valve rocker arm assembly includes a first rocker arm housing, a second rocker arm housing rotatably interconnected with the first rocker arm housing, the first rocker arm housing having a pin bore therethrough, the second rocker arm housing having a first locking hole, an intermediate pin mounted in the pin bore, and is capable of being partially extended into the first locking hole or fully retracted into the pin hole by axial sliding, the intermediate pin having a flange radially protruding to limit a sliding range of the intermediate pin in the pin hole, the flange axially divides the intermediate pin into a first section facing the first locking hole and a second section facing away from the first locking hole, wherein the intermediate pin has a central bore extending axially and through to an end of the intermediate pin, a first side bore through to the central bore from an outer peripheral surface of the first segment, and a second side bore through to the central bore from an outer peripheral surface of the second segment. In order to limit the sliding range of the intermediate pin in the pin hole, an annular cavity may be formed between the outer peripheral surface of the intermediate pin on both sides in the axial direction of the flange and the inner peripheral surface of the pin hole, while the outer peripheral surfaces on both ends in the axial direction of the intermediate pin and the inner peripheral surface of the pin hole are surfaces that are in sliding engagement so that the annular cavity is relatively closed. When the middle pin axially slides in the pin hole, air in the annular spaces on two sides of the flange can be communicated with the central hole through the two side holes respectively and further communicated with the outside, so that the air can flow between the annular spaces and the outside, the compressed air resistance to the middle pin, particularly the flange, is reduced, and the sliding of the middle pin is facilitated. The ventilation structure of the structure does not need to additionally drill holes in the rocker arm shell, and the middle pin with the central hole can be formed in one step through a cold extrusion process, so that the production cost can be greatly reduced.

According to a preferred embodiment of the present invention, the first side hole and the second side hole may be radially extended, respectively. First side opening and second side opening can be at cold extrusion in-process and middle round pin one shot forming, also can form through the drilling in the later stage, and simple process easily realizes.

According to another preferred embodiment of the invention, the opening of the second side hole on the outer peripheral surface of the second section can be axially hugged or close to the flange, so that once one side of the flange facing away from the first locking hole forms a cavity, this cavity communicates with the second side hole, thereby facilitating the flow of air.

According to another preferred embodiment of the invention, the pin hole may have a third section, which is the section of the pin hole closest to the first locking hole, the third section being able to fit the outer circumferential surface guiding the first section, the opening of the first side hole on the outer circumferential surface not coinciding with the axial position of the third section in all sliding positions of the intermediate pin relative to the pin hole. On the side of the flange facing the first locking hole, it is usually necessary to mount a return device such as a spring, so that there is always an annular cavity on this side. As long as the first lateral bore does not slide into the region of the third section, it is possible to ensure that the cavity communicates with the outside via the first lateral bore.

According to a further preferred embodiment of the present invention, the second rocker arm housing may have a first side plate and a second side plate, the first side plate and the second side plate being spaced apart from each other in the direction of the axis of rotation of the second rocker arm housing relative to the first rocker arm housing, the first rocker arm housing being rotatably mounted between the first side plate and the second side plate, the first locking hole being located on the first side plate. This means that the first rocker arm housing constitutes an inner rocker arm and the second rocker arm housing constitutes an outer rocker arm. At this time, the second side plate preferably has a second locking hole axially aligned with the first locking hole, and the valve rocker arm assembly further includes a locking pin mounted in the second locking hole, the locking pin being axially slidable in the second locking hole to partially extend into the pin hole so as to push the intermediate pin. In this case, the central hole may penetrate to an end of the intermediate pin facing the first locking hole, so that the air flow in the central hole is not obstructed by the locking pin.

According to another preferred embodiment of the present invention, the intermediate pin and the pin hole may have substantially the same axial length, or the axial length of the intermediate pin may also be slightly smaller than the axial length of the pin hole, so that the first rocker arm housing and the second rocker arm housing can be rapidly switched between the relative locking position and the relative releasing position, and at the same time, when the first rocker arm housing and the second rocker arm housing are relatively rotated, the intermediate pin may also be completely retracted into the pin hole without causing interference with the second rocker arm housing.

Drawings

The invention is further described below with reference to the accompanying drawings. Identical reference numbers in the figures denote functionally identical elements. Wherein:

FIG. 1 illustrates a perspective view of a valve rocker arm assembly according to an embodiment of the present invention;

FIG. 2 illustrates a cross-sectional view of a valve rocker arm assembly according to an embodiment of the present invention; and

fig. 3a to 3c show schematic views of an intermediate pin of a valve rocker arm assembly according to an embodiment of the invention.

Detailed Description

Specific embodiments of a valve rocker arm assembly according to the present invention will be described below with reference to the accompanying drawings. The following detailed description and drawings are included to illustrate the principles of the invention, and the invention is not limited to the preferred embodiments described, but rather the scope of the invention is defined by the claims.

According to the utility model discloses an embodiment provides a valve rocker subassembly, and this valve rocker subassembly is applied to the valvetrain that has changeable valve lift. Fig. 1 shows a perspective view of the valve rocker arm assembly. As shown in fig. 1, the valve rocker arm assembly includes two rocker arm housings: a first rocker arm housing 1 and a second rocker arm housing 2. The first and second

rocker arm housings

1 and 2 are each of an elongated structure extending generally in the longitudinal direction, and are connected together at respective one ends by a cylindrical pivot pin 6, so that the first and second

rocker arm housings

1 and 2 can be relatively rotated about the center axis of the pivot pin 6 as a rotation axis, which is perpendicular to the longitudinal direction. Wherein the second rocker arm housing 2 has two side plates: a first side plate 21 and a second side plate 22, the two

side plates

21, 22 being spaced apart from each other in the direction of the rotational axis and being connected to each other at both ends in the longitudinal direction, respectively. The first rocker arm housing 1 is mounted between the two

side plates

21, 22 of the second rocker arm housing 2. A roller 5 in the form of a roller is rotatably mounted in the longitudinal middle of the first rocker arm housing 1 (e.g. by a mounting pin, not shown) for rolling engagement with a drive mechanism (e.g. a cam mechanism, not shown), and the axis of rotation of the roller 5 relative to the first rocker arm housing 1 is parallel to the axis of rotation of the second rocker arm housing 2 relative to the first rocker arm housing 1.

As shown in the cross-sectional view of fig. 2, the first rocker arm housing 1 has a pin hole 11 at the other end opposite the pivot pin 6, the pin hole 11 extending parallel to the axis of rotation of the second rocker arm housing 2 relative to the first rocker arm housing 1 and through the first rocker arm housing 1. Accordingly, the first side plate 21 and the second side plate 22 have a first locking hole 23 and a second locking hole 24, respectively, at the other end opposite to the pivot pin 6, the first locking hole 23 and the second locking hole 24 extend parallel to the axial direction of the pin hole 11 and penetrate the respective side plates, respectively, and the center axes of the first locking hole 23 and the second locking hole 24 are aligned with each other. The valve rocker mechanism further comprises an intermediate pin 3 and a locking pin 4. The locking pin 4 is generally cylindrical in shape as a whole and is slidably mounted in a second locking hole 24 on the second side plate 22. The intermediate pin 3 is also generally cylindrical in shape as a whole and is slidably mounted in the pin hole 11.

Fig. 3a to 3c show a perspective view, a front view and a sectional view, respectively, of the intermediate pin 3. As shown, the intermediate pin 3 has an annular flange 31 projecting radially from the outer peripheral surface and a central hole 34 extending along the central axis. The center hole 34 penetrates into the end surface of the intermediate pin 3 toward one end of the first side plate 21, and the other end is closed. The flange 31 divides the intermediate pin 3 in the axial direction into two sections: a first section 32 facing the first side plate 21 and a second section 33 facing the second side plate 22. The first side hole 35 radially penetrates to the center hole 34 at the outer peripheral surface of the first section 32, and the second side hole 36 radially penetrates to the center hole 34 at the outer peripheral surface of the second section 33.

As shown in fig. 2, the pin hole 11 is divided into three sections in the axial direction: a third section 12 closest to the first side plate 21, a fifth section 14 closest to the second side plate 22 and a fourth section 13 connected therebetween. The third section 12, the fourth section 13 and the fifth section 14 are all cylindrical coaxially extending, and the radii of the three become larger in sequence along the direction from the first side plate 21 to the second side plate 22. An annular bushing 7 is mounted in the fifth section 14 in an interference fit, the end face of the bushing 7 facing the second side plate 22 being flush with the side surface of the first rocker arm housing 1. The axial length of the intermediate pin 3 is substantially equal to the width of the first rocker arm housing 1 (i.e. the axial length of the pin bore 11), or preferably slightly smaller than the width of the first rocker arm housing 1, the outer diameter of the first section 32 corresponds to the inner diameter of the third section 12, and the outer diameter of the second section 33 corresponds to the inner diameter of the bushing 7 (i.e. equal or slightly smaller), so as to be able to guide the axial sliding of the intermediate pin 3 in the pin bore 11. The outer diameter of the flange 31 corresponds to or is smaller than the inner diameter of the fifth section 14 but is larger than the inner diameters of the fourth section 13 and the bush 7, and when the intermediate pin 3 is mounted in the pin hole 11, the flange 31 is located between the inner end of the fifth section 14 and the inner end of the bush 7, thereby limiting the sliding range of the intermediate pin 3. One end of the spring 8 abuts against the flange 31, and the other end abuts against a step formed at the boundary of the fourth section 13 and the third section 12. The end of the locking pin 4 facing the pin hole 11 may have the same or a slightly smaller radius than the second section 33. The first locking hole 23 may have the same radius as the third section 12.

When the first rocker arm housing 1 and the second rocker arm housing 2 are in a relatively rotatable state, the intermediate pin 3 is completely retracted in the pin hole 11, and the lock pin 4 does not protrude to the inside of the second side plate 22 toward the end of the first rocker arm housing 1. When the pin hole 11 of the first rocker arm housing 1 is axially aligned with the two locking

holes

23, 24 of the second rocker arm housing 2, a drive mechanism (not shown) may drive the locking pin 4 toward the inside (i.e., toward the side of the pin hole 11) such that the locking pin 4 slides axially and partially protrudes into the pin hole 11, thereby pushing the intermediate pin 3 to slide axially toward the first side plate 21 and partially protrude into the first locking hole 23, thereby locking the relative rotational positions of the first rocker arm housing 1 and the second rocker arm housing 2. When the locking pin 4 is retracted from the pin hole 11 into the second locking hole 24, the spring 8 is able to return the intermediate pin 3 by elastic force to a position in which the flange 31 abuts against the bush 7, in which position both side end faces of the intermediate pin 3 are flush with the side surfaces of the first rocker arm housing 1, thereby releasing the first rocker arm housing 1 and the second rocker arm housing 2 relatively.

The first side openings 35 are located in the region of the fourth section 13 or the fifth section 14 throughout the entire sliding range of the intermediate pin 3 in the axial direction, i.e. do not coincide with the third section 12, so that the annular cavity formed between the outer circumferential surface of the first section 32 and the fourth section 13 or the fifth section 14 can always communicate with the central opening 34 via the first side openings 35. The air in this cavity can thus communicate with the outside through the end opening of the central hole 34 without creating a resistance to compressed air when the intermediate pin 3 slides. Accordingly, second side holes 36 are provided immediately adjacent or near flange 31 so that when flange 31 is disengaged from the end of bushing 7 to form an annular cavity therebetween, the cavity may also communicate with central bore 34 through second side holes 36. Therefore, the air in the cavity can also communicate with the outside through the end opening of the center hole 34 without forming a resistance to the compressed air when the center pin 3 slides.

The intermediate pin 3 according to the above embodiment may be manufactured by a cold extrusion process using a metal material, and the central hole 34 is formed at one time in the cold extrusion process. The two

side holes

35, 36 can be formed in one step during the cold extrusion process or can be drilled later. The material of the middle pin 3 can be selected from 100Cr6 or 16MnCr 5. Compared with the processing mode in the prior art, the processing mode can reduce the processing procedure and difficulty of the machine, thereby greatly reducing the production cost.

Although possible embodiments have been described by way of example in the above description, it should be understood that numerous embodiment variations exist, still by way of combination of all technical features and embodiments that are known and that are obvious to a person skilled in the art. It should also be appreciated that the exemplary embodiment or exemplary embodiments are only examples, and are not intended to limit the scope, applicability, or configuration of the invention in any way. From the foregoing description, one of ordinary skill in the art will more particularly provide a technical guide to convert at least one exemplary embodiment, wherein various changes may be made, particularly in matters of function and structure of the components described, without departing from the scope of the following claims.

List of reference numerals

1 first rocker arm housing

11 pin hole

12 third section

13 fourth section

14 fifth section

2 second rocker arm housing

21 first side plate

22 second side plate

23 first locking hole

24 second locking hole

3 middle pin

31 Flange

32 first section

33 second section

34 center hole

35 first side hole

36 second side hole

4 locking pin

5 roller

6 pivot pin

7 liner

8 spring

Claims

1. A valve rocker assembly comprising a first rocker arm housing (1), a second rocker arm housing (2) and an intermediate pin (3), the first rocker arm housing (1) and the second rocker arm housing (2) being rotatably connected to each other, the first rocker arm housing (1) having a pin bore (11) therethrough, the second rocker arm housing (2) having a first locking bore (23), the intermediate pin (3) being mounted in the pin bore (11) and being capable of being partially inserted into the first locking bore (23) or fully retracted into the pin bore (11) by axial sliding, the intermediate pin (3) having a flange (31) projecting radially to limit the extent of sliding of the intermediate pin (3) in the pin bore (11), the flange (31) axially dividing the intermediate pin (3) into a first section (32) facing towards the first locking bore (23) and a second section (33) facing away from the first locking bore (23),

it is characterized in that the preparation method is characterized in that,

the intermediate pin (3) has a central hole (34), a first side hole (35) and a second side hole (36), the central hole (34) extending axially and penetrating to the end of the intermediate pin (3), the first side hole (35) penetrating from the outer peripheral surface of the first section (32) to the central hole (34), the second side hole (36) penetrating from the outer peripheral surface of the second section (33) to the central hole (34).

2. A valve rocker assembly according to claim 1, characterized in that the first side hole (35) and the second side hole (36) each extend radially.

3. A valve rocker assembly according to claim 1, characterized in that the opening of the second side hole (36) on the outer peripheral surface of the second section (33) is in axial abutment against the flange (31).

4. A valve rocker assembly according to claim 1, characterized in that the pin bore (11) has a third section (12), the third section (12) being the section of the pin bore (11) closest to the first locking hole (23), the third section (12) being able to snugly guide the outer peripheral surface of the first section (32), the opening of the first side hole (35) in the outer peripheral surface being misaligned with the axial position of the third section (12) in all sliding positions of the intermediate pin (3) relative to the pin bore (11).

5. A valve rocker assembly according to claim 1, characterized in that the second rocker housing (2) has a first side plate (21) and a second side plate (22), the first side plate (21) and the second side plate (22) being spaced apart from each other in the direction of the axis of rotation of the second rocker housing (2) relative to the first rocker housing (1), the first rocker housing (1) being rotatably mounted between the first side plate (21) and the second side plate (22), the first locking hole (23) being located in the first side plate (21).

6. A valve rocker assembly according to claim 5, characterized in that the second side plate (22) has a second locking hole (24) axially aligned with the first locking hole (23), the valve rocker assembly further comprising a locking pin (4) mounted in the second locking hole (24), the locking pin (4) being axially slidable in the second locking hole (24) to partially protrude into the pin hole (11) for pushing the intermediate pin (3).

7. A valve rocker assembly according to claim 6, characterized in that the central bore (34) passes through to the end of the intermediate pin (3) facing the first locking bore (23).

8. A valve rocker assembly according to any of claims 1 to 7, characterized in that the intermediate pin (3) has the same axial length as the pin bore (11).