CN210239857U

CN210239857U - Sensor mounting structure and engine

Info

Publication number: CN210239857U
Application number: CN201920709075.5U
Authority: CN
Inventors: Yanping Cui; 崔燕平; Xiaoyan Jin; 靳晓妍; Yuanzhang He; 何元章; Lijie Pan; 潘理杰; Jingyao Gong; 龚婧瑶
Original assignee: Dongfeng Motor Corp
Current assignee: Dongfeng Motor Corp
Priority date: 2019-05-17
Filing date: 2019-05-17
Publication date: 2020-04-03
Anticipated expiration: 2029-05-17

Abstract

The utility model discloses a sensor mounting structure and an engine, wherein the sensor mounting structure comprises a sensor, a mounting platform and a fixing bolt; the sensor comprises a sensor body and a fixed side plate, wherein the sensor body comprises a signal probe; the fixed side plate is provided with a bolt mounting hole parallel to the sensor body; the mounting platform is provided with a fixing bolt hole and a probe positioning hole, and a boss with a hole is arranged on the mounting platform around the fixing bolt hole; the fixed side plate is fixed on the mounting platform through a fixing bolt, and the upper surface of the boss with the hole limits the fixed side plate and plays a supporting role. When the sensor mounting structure is applied to mounting of the engine phase sensor, the warping of the position of the phase sensor can be avoided, and the acquisition precision of the camshaft phase is improved.

Description

Sensor mounting structure and engine

Technical Field

The utility model relates to an engine especially indicates a sensor mounting structure and engine.

Background

With the increasing requirements of customers on the performance of automobile engines, increasingly stringent emission and oil consumption regulations are applied. In order to improve the power and the torque of the engine and reduce the oil consumption and the emission, the engine newly developed by various manufacturers basically adopts a variable valve timing technology, namely a VVT technology. The basic principle is that the air inflow can be changed along with the change of the rotating speed and the load of the engine by adjusting the phase of the cam of the engine, so that the optimal combustion efficiency is achieved, and the fuel economy is improved.

The phase of the engine cam is monitored in real time by a phase sensor, and the action effect of VVT is directly influenced by the precision of the acquired signal. The existing phase sensor is usually fixed on a large installation plane through a single bolt, after the fixed bolt is tightened, the phase sensor and the installation plane generate large deformation near the bolt, so that the phase sensor sinks at one side of the bolt, the phase sensor is warped, the axis of a probe of the phase sensor and the axis of a signal panel are changed into a non-coplanar from an intersection, the non-coplanar state cannot be directly opposite to a cam, and the accuracy of the acquired phase signal is influenced. Although the engine ECU has an automatic correction function for the signal from the phase sensor, a fault, vehicle vibration, or even misfire can be reported when the correction range is exceeded.

Disclosure of Invention

An object of the utility model is to provide a can improve sensor mounting structure of sensor installation accuracy and adopt this kind of sensor mounting structure's engine.

In order to achieve the purpose, the sensor mounting structure of the sensor mounting structure comprises a sensor, a mounting platform and a fixing bolt; the sensor comprises a sensor body and a fixed side plate arranged in the middle of the sensor body, the sensor body comprises a signal probe arranged on the lower portion of the sensor body, the fixed side plate is fixed on a mounting platform through a fixing bolt, a boss with holes is arranged between the fixed side plate and the mounting platform around the fixing bolt, and the boss with holes can be arranged on the lower portion of the fixed side plate and the upper portion of the mounting platform or arranged between the fixed side plate and the mounting platform through an independent backing plate.

Preferably, the fixed side plate is provided with a bolt mounting hole (in the axial direction of the fixed side plate and the sensor body) parallel to the sensor body outside the sensor body; the mounting platform is provided with a fixing bolt hole and a probe positioning hole, and the boss with the hole is arranged at the upper part of the mounting platform; the fixed side plate is fixed on a fixed bolt hole of the mounting platform through a fixed bolt penetrating through the bolt mounting hole, and the upper surface of the boss with the hole limits the fixed side plate and plays a supporting role; meanwhile, a signal probe of the sensor vertically penetrates through a probe positioning hole.

Preferably, the lower surface of the fixed side plate is a side plate mounting surface, the upper surface of the boss with the hole is a fixed plane, and the mounting platform is a limiting plane near the probe positioning hole; under the fastening action of the fixing bolt, the side plate mounting surface of the fixed side plate is in close contact with the fixing plane of the boss with the hole; the fixed plane is higher than the limiting plane, so that a gap d with a certain thickness is formed between the side plate mounting surface of the fixed side plate and the limiting plane of the mounting platform.

Preferably, the fixing bolt hole comprises a nut sleeve mounting hole and a nut sleeve sleeved in the nut sleeve mounting hole, and the nut sleeve is provided with a threaded hole matched with the fixing bolt; the upper end of the nut sleeve is provided with an annular flange, part or all of the annular flange protrudes above a limiting plane, the protruding part forms the boss with the hole, and the top end plane of the annular flange forms the fixing plane. The upper part of the nut sleeve is used as a boss with holes (equivalent to integrating the boss with holes on the nut sleeve), and the nut sleeve is suitable for reforming an existing mounting platform with a fixing plane and a limiting plane coplanar. Such modifications may not be made if the apertured bosses have been prefabricated or machined on the mounting platform.

Preferably, an annular groove is formed in the outer side of the signal probe, and an O-shaped sealing ring is sleeved on the annular groove.

Preferably, the nut sleeve is installed in the nut sleeve installation hole in a threaded connection or interference fit mode.

Preferably, the outer side of the nut sleeve is provided with a latticed groove, and the nut sleeve is installed in the nut sleeve installation hole in an interference fit mode. The latticed grooves are machined on the outer side of the nut sleeve, so that the contact force of interference fit can be increased.

Preferably, the clearance d is 0.3-0.5 mm. Because the whole planeness of the large plane is large, the effect that the gap is too small cannot be expected is achieved, if the gap is too large, the distance between the phase sensor and the limiting surface is too large, the amplitude is increased, and the structural strength of the phase sensor is influenced under the condition that the engine vibrates for a long time.

Preferably, the fixing bolt is provided with a contact flange, and the area of the fixing plane of the boss with holes is the same as the area of the flange surface of the contact flange. The too big meeting of fixed plane's area is similar with big plane contact, because the unevenness of face can take place the warpage, the undersize can be because the sensor below bearing area is not enough, lead to sensor local deformation serious and then influence the signal acquisition precision.

The utility model also provides an engine adopting the sensor mounting structure, which comprises a camshaft, a signal panel and a cylinder head cover, and a sensor (namely a phase sensor) for measuring the phase of the signal panel; the cylinder cover is provided with the mounting platform, and the sensor is mounted on the mounting platform by adopting the sensor mounting structure.

Preferably, after the sensor is installed, the signal probe is positioned right above the signal panel, and the extension line of the axis of the signal probe is perpendicular to the rotation center line of the signal panel.

Compared with the prior art, the beneficial effects of the utility model reside in that: the sensor mounting structure is suitable for mounting a sensor which is fixed from the side by adopting a single fixing bolt and is parallel to a signal probe by a fixing bolt hole, a limiting plane and a fixing plane with a height difference are formed by arranging the boss with the hole on the mounting platform, and the fixing support plate of the sensor is basically free from warping after the sensor is mounted and fixed by adopting the single fixing bolt, so that the mounting precision and the signal acquisition precision of the sensor are improved. Meanwhile, the smaller fixed plane is also beneficial to improving the plane machining precision, and the sum signal acquisition precision is further improved. When the sensor mounting structure is applied to mounting of an engine phase sensor, a signal probe of the phase sensor can be ensured to be positioned right above a signal panel of a camshaft assembly, the axis of the signal probe is coplanar with the rotation center line of the signal panel and is mutually perpendicular, and the acquisition precision of the camshaft phase is ensured.

Drawings

Fig. 1 is a perspective view of a sensor mounting structure designed in embodiment 1.

Fig. 2 is an exploded view of the sensor mounting structure of fig. 1.

Fig. 3 and 4 are front and left side views of the sensor mounting structure of fig. 1, respectively.

Fig. 5 is a schematic sectional view taken along the direction a-a in fig. 4.

Fig. 6 is an enlarged view at B in fig. 5.

Fig. 7 is a schematic view of an engine (modified portion) designed in embodiment 2.

Fig. 8 is a schematic sectional view of the sensor mounting structure employed in the engine of embodiment 3 at the same position as in fig. 5, showing both the camshaft and the signal panel.

Fig. 9 is an enlarged view at C in fig. 8.

Fig. 10 and 11 are force analysis diagrams of the sensor mounting structure under the two conditions of not arranging the boss with the hole and arranging the boss with the hole respectively.

Wherein: the sensor comprises a sensor body 10, a signal probe 11, a fixed side plate 20, a bolt mounting hole 21, a side plate mounting surface 22, a mounting platform 30, a fixed bolt hole 31, a nut sleeve mounting hole 32, a nut sleeve 33, an annular flange 34, an O-shaped sealing ring 35, a probe positioning hole 36, a boss 37 with a hole, a fixed plane 38, a limit plane 39, a fixed bolt 40, a contact flange 41, a camshaft 50, a signal disc 60 and a cylinder cover 70

Detailed Description

The present invention will be described in further detail with reference to the following drawings and specific embodiments.

Example 1

As shown in fig. 1 to 6, the sensor mounting structure designed in this embodiment includes a sensor, a mounting platform 30, and a fixing bolt 40. Wherein:

the sensor comprises a sensor body 10 and a fixed side plate 20, wherein the fixed side plate 20 is arranged in the middle of the sensor body 10 and is deviated to one side. The lower part of the sensor body 10 is provided with a signal probe 11. An annular groove is formed in the outer side of the signal probe 11, and an O-shaped sealing ring 35 is sleeved on the annular groove.

One side of the fixed side plate 20 is provided with a bolt mounting hole 21 parallel to the axial direction of the sensor body 10, and the lower surface of the fixed side plate 20 is provided as a side plate mounting surface 22.

The mounting platform 30 is provided with a fixing bolt hole 31 and a probe positioning hole 36, a perforated boss 37 is arranged on the mounting platform 30 around the fixing bolt hole 31, the upper surface of the perforated boss 37 is a fixing plane 38, and the mounting platform 30 is a limiting plane 39 near the probe positioning hole 36.

The fixing bolt 40 is provided with a contact flange 41, and the area of the fixing plane 38 of the holed boss 37 is the same as the flange face area of the contact flange 41.

When the sensor is installed, the fixing side plate 20 is fixed on the fixing bolt hole 31 of the installation platform 30 by the fixing bolt 40 passing through the bolt installation hole 21, and simultaneously, the signal probe 11 of the sensor vertically passes through the probe positioning hole 36. The O-ring 35 outside the signal probe 11 plays a guiding and sealing role.

The side plate mounting surface 22 of the fixed side plate 20 is brought into close contact with the fixing flat surface 38 of the holed boss 37 by the fastening action of the fixing bolt 40. Due to the lifting effect of the boss 37 with holes, the fixing plane 38 is higher than the limiting plane 39, so that a gap d with a certain thickness is formed between the side plate mounting surface 22 of the fixed side plate 20 and the limiting plane 39 of the mounting platform 30, the gap d is determined by the height of the boss 37 with holes and is set between 0.3 mm and 0.5mm as required, and the thickness of the gap d is 0.5mm in the embodiment. The gap effectively reduces the warping degree of the fixed support plate after the fixed bolt is tightly pressed, and the specific analysis is detailed in a test example.

Example 2

As shown in fig. 1 to 4 and 7, the present embodiment discloses an engine including a camshaft 50, a signal disc 60, and a cylinder head cover 70, and a sensor (i.e., a phase sensor) for measuring a phase of the signal disc 60.

Camshaft 50 and signal disc 60 are in the same place through the installation mode of interference, and the outer fringe of signal disc 60 is provided with a plurality of fan-shaped gaps of equidimension not, supplies the sensor to detect the use of rotational position (phase place). Camshaft 50 utilizes the fixed piece of closing of camshaft bearing cap to assemble on the cylinder after through camshaft bearing cap assembly spacing.

The cylinder head cover 70 is assembled to the cylinder head by the cylinder head cover fixing part, the mounting platform 30 is provided on the cylinder head cover 70, and the phase sensor is mounted on the mounting platform 30 by using the sensor mounting structure given in embodiment 1.

After the phase sensor is installed, the signal probe 11 is located right above the signal panel 60, and the extension line of the axis of the phase sensor is perpendicular to the rotation center line of the signal panel 60.

Example 3

As shown in fig. 1 to 4 and fig. 7 to 9, the present embodiment discloses another engine, which has a structure substantially the same as that of embodiment 2, except that:

the present embodiment modifies the existing installation platform 30 with the fixing plane 38 and the limiting plane 39 coplanar, so as to achieve the effect equivalent to that of embodiment 2.

Specifically, the bolt hole 31 includes a nut bushing mounting hole 32 and a nut bushing 33, and a threaded hole matching the fixing bolt 40 is provided at the center of the nut bushing 33. The outer side of the nut sleeve 33 is provided with a grid-shaped groove and is arranged in the nut sleeve mounting hole 32 in an interference fit mode.

The upper end of the nut sleeve 33 is provided with an annular flange 34, the outer diameter of the annular flange 34 is larger than the inner diameter of the nut sleeve mounting hole 32, the annular flange is protruded above the fixing bolt hole 31 and a limiting plane 39 after being mounted to form a boss 37 with a hole, and the top end plane of the boss forms a fixing plane 38.

Test examples

To better explain the function principle of the present invention, this experimental example adopts ANSYS Workbench, and to the simplified model based on sensor mounting structure in embodiment 1, the force analysis is carried out under not setting up foraminiferous boss 37 and setting up foraminiferous boss 37 two kinds of circumstances, and the result is as follows:

fig. 10 is a force analysis diagram when no boss with holes is arranged, and it can be seen from the diagram that the sensor is obviously warped after the fixing bolt 40 is tightened because the mounting surface of the conventional mounting structure does not distinguish the fixing plane 38 and the limiting plane 39, i.e. the fixing plane and the limiting plane are coplanar.

Fig. 11 is a stress analysis diagram when the perforated boss is arranged, and it can be seen from the diagram that, since the improved fixing plane 38 is higher than the limiting plane 39, the sensor is basically not warped after the fixing bolt 40 is tightened, and the acquisition precision of the phase signal of the camshaft 50 is further ensured.

Claims

1. The utility model provides a sensor mounting structure, includes sensor, mounting platform (30) and fixing bolt (40), the sensor includes sensor body (10) and sets up fixed curb plate (20) at sensor body (10) middle part, sensor body (10) are including setting up signal probe (11) in its lower part, fixed curb plate (20) are fixed on mounting platform (30) through fixing bolt (40), its characterized in that: a boss (37) with holes is arranged between the fixed side plate (20) and the mounting platform (30) in a surrounding mode around the fixing bolt (40).

2. The sensor mounting structure according to claim 1, wherein: the fixed side plate (20) is provided with a bolt mounting hole (21) which is parallel to the axial direction of the sensor body (10) and is arranged outside the sensor body (10); the mounting platform (30) is provided with a fixing bolt hole (31) and a probe positioning hole (36), and the boss (37) with the hole is arranged at the upper part of the mounting platform (30); the fixed side plate (20) is fixed on a fixed bolt hole (31) of the mounting platform (30) through a fixed bolt (40) penetrating through the bolt mounting hole (21), and the upper surface of the boss (37) with the hole forms a limit position for the fixed side plate (20) and plays a supporting role; meanwhile, a signal probe (11) of the sensor vertically penetrates through a probe positioning hole (36).

3. The sensor mounting structure according to claim 2, wherein: the lower surface of the fixed side plate (20) is set as a side plate mounting surface (22), the upper surface of the boss (37) with the hole is set as a fixed plane (38), and the mounting platform (30) is set as a limiting plane (39) near the probe positioning hole (36); under the fastening action of the fixing bolt (40), the side plate mounting surface (22) of the fixed side plate (20) is tightly contacted with the fixing plane (38) of the boss (37) with the hole; the fixing plane (38) is higher than the limiting plane (39), so that a gap d with a certain thickness is formed between the side plate mounting surface (22) of the fixed side plate (20) and the limiting plane (39) of the mounting platform (30).

4. The sensor mounting structure according to claim 3, wherein: the fixing bolt hole (31) comprises a nut sleeve mounting hole (32) and a nut sleeve (33) sleeved in the nut sleeve mounting hole (32), and the nut sleeve (33) is provided with a threaded hole matched with the fixing bolt (40); the upper end of the nut sleeve (33) is provided with an annular flange (34), part or all of the annular flange (34) protrudes above a limiting plane (39), the protruding part forms the boss (37) with the hole, and the top end plane of the annular flange (34) forms the fixing plane (38).

5. The sensor mounting structure according to claim 4, wherein: the outer side of the nut sleeve (33) is provided with latticed grooves, and the nut sleeve is installed in the nut sleeve installation hole (32) in an interference fit mode.

6. The sensor mounting structure according to any one of claims 3 to 5, wherein: the outer side of the signal probe (11) is provided with an annular groove, and an O-shaped sealing ring (35) is sleeved on the annular groove.

7. The sensor mounting structure according to any one of claims 3 to 5, wherein: the clearance d is 0.3-0.5 mm.

8. The sensor mounting structure according to any one of claims 3 to 5, wherein: the fixing bolt (40) is provided with a contact flange (41), and the area of the fixing plane (38) of the boss (37) with the hole is the same as the area of the flange surface of the contact flange (41).

9. An engine using the sensor mounting structure according to any one of claims 1 to 8, characterized in that: the camshaft timing device comprises a camshaft (50), a signal disc (60), a cylinder head cover (70) and a sensor for measuring the phase of the signal disc (60); the mounting platform (30) is arranged on the cylinder head cover (70), and the sensor is mounted on the mounting platform (30) by adopting the sensor mounting structure.

10. The engine of claim 9, wherein: after the sensor is installed, the signal probe (11) is positioned right above the signal panel (60), and the extension line of the axis of the signal probe is vertically intersected with the rotation center line of the signal panel (60).