Dodge Ram fastener-free wiper mount.

A customer manufacturing request became a product-design opportunity

The complete wiper module was installed in the truck by one assembly operator working from the driver side. Under the conventional mounting arrangement, the operator would also have needed to reach across the vehicle to install the passenger-side pivot fastener.

That attachment added both product and process content:

• One additional production fastener.
• One additional fastening operation at the truck assembly plant.
• Additional operator reach and tool-access time.
• An ergonomically difficult task on the opposite side of the vehicle.

Chrysler wanted a solution that eliminated the separate passenger-side fastener while preserving positive pivot retention, rubber isolation, dimensional tolerance accommodation, assembly repeatability, and full wiper-system durability.

The mounting sequence had to preserve the tolerance strategy

The three module attachments performed different functions within the vehicle and wiper-system tolerance stack.

The driver-side pivot was the primary locating attachment and was fastened first. The passenger-side pivot accommodated cross-car dimensional variation. Under a conventional bolted arrangement, that location would use a larger slotted hole rather than rigidly over-constraining the module.

The motor mount was secured last and used a larger clearance feature to accommodate positional variation in both vehicle directions.

The fastener-free passenger-side attachment therefore could not rigidly determine the module position before the driver-side pivot established the primary location. It had to retain and isolate the passenger-side pivot while remaining compatible with the intended installation sequence and dimensional variation.

A Z-shaped tang converted installation motion into mechanical engagement

I developed a passenger-side pivot body with an integral Z-shaped stamped tang. A rubber isolation grommet surrounded the tang and formed the compliant interface between the wiper module and the vehicle body.

The receiving area in the vehicle sheet metal was approximately square, as was the corresponding interface at the pivot body. This geometry controlled the attachment's orientation while permitting the movement required during installation.

The operator inserted the complete module from the driver side with the passenger-side mount angled relative to the vehicle attachment surface. As the module was rotated downward into its installed position, the Z-shaped tang and rubber grommet engaged the sheet-metal opening.

The rotation created a slight controlled interference in the rubber isolator, seating and constraining the passenger-side pivot without a separate fastener. The operator then installed the accessible driver-side pivot fastener followed by the motor-mount fastener.

The attachment used motion already required to position the module. No separate cross-vehicle reach was necessary to complete the passenger-side mount.

One feature provided retention, isolation, and tolerance accommodation

The Z-tang architecture combined several functions that otherwise would have depended on a fastener, slotted mounting interface, and separate isolation features.

The shaped tang provided mechanical engagement with the vehicle body. The rubber grommet provided:

• Controlled interference during installation.
• Noise and vibration isolation.
• Compliance for dimensional variation.
• Retention against normal operational movement.
• Protection against metal-to-metal contact.

The design constrained the passenger-side pivot sufficiently for vehicle operation while allowing the driver-side pivot and motor mount to establish the final system position according to the intended locating strategy.

This was not simply a bolt replaced by a hook. The attachment integrated mounting geometry, installation motion, elastomeric isolation, tolerance management, and operator ergonomics into one production feature.

Concept ownership with delegated detailed development

My responsibility occurred in two distinct phases.

During quotation, I was the responsible engineer for the proposed complete wiper-system design and the technical package supporting supplier selection and program award.

After award, detailed development responsibility was assigned to a subordinate development engineer. When Chrysler later requested the passenger-side manufacturing improvement, I developed the fastener-free Z-tang concept and remained involved as Engineering Manager and technical adviser while the design was matured, released, validated, and launched.

The assigned development engineer carried much of the detailed production work. My contribution was the original attachment concept, technical direction, and continued support as the design transitioned into production.

Full-system validation confirmed production readiness

The final attachment completed the standard wiper-system validation program, including:

• System durability testing.
• Reliability and confidence testing at the 95/90 level.
• Vehicle and component vibration testing.
• Motor-stall loading.
• Snow-block loading.
• Impact loading.
• Low-temperature operation.
• High-temperature operation.

The passenger-side attachment had to remain seated and functional during ordinary wiping and under the substantially higher loads produced by stall, obstruction, snow accumulation, vibration, impact, and temperature extremes.

The completed validation program confirmed that the Z-tang and rubber-isolator interface could eliminate the passenger-side fastener without compromising retention, isolation, or system durability.

Production launch without redesign

The fastener-free passenger-side attachment entered production on the Dodge Ram 1500 DS. The same mounting approach was later used on the Ram 2500 and 3500 models.

• Eliminated one passenger-side mounting fastener.
• Eliminated the corresponding vehicle-assembly fastening operation.
• Reduced component and process content.
• Reduced assembly time.
• Removed a difficult cross-vehicle operator reach.
• Supported installation by one operator from the driver side.
• Preserved the required location and tolerance-management strategy.
• Maintained rubber isolation at the passenger-side pivot.
• Passed the complete wiper-system validation program.
• Launched without modification after final production release.
• Experienced no known production, warranty, or field issues associated with the Z-tang attachment.

The design was completely successful in production.

The larger value came from eliminating an assembly operation

The eliminated fastener provided a modest piece-cost reduction. The larger manufacturing benefit came from removing an entire assembly operation.

The design avoided the need to purchase, handle, present, and drive an additional fastener at the vehicle plant. It also removed the operator reach and tool access required at the passenger-side location.

Because documented financial savings are not available, no precise dollar claim is appropriate. The defensible result is that the design reduced both product content and assembly-process content while improving operator ergonomics.